OPT3006 [TI]
超薄环境光传感器 (ALS);
| 型号： | OPT3006 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 超薄环境光传感器 (ALS) 传感器 |
| 文件： | 总41页 (文件大小：837K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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OPT3006
ZHCSFL9 –OCTOBER 2016
OPT3006 超薄环境光传感器
1 特性
3 说明
1
•
采用精密光学过滤以匹配人眼：
可阻隔 99%（典型值）以上的红外线 (IR)
OPT3006 是一款单芯片照度计，用于测量人眼的可见
光强度。OPT3006 采用超小型 PicoStar 封装，因此该
器件可在狭小空间内进行安装。
–
•
•
•
自动满量程设置功能简化了软件并提供最优配置
测量范围：0.01 lux 至 83k lux
传感器的高精度光谱响应与人眼的白昼视觉响应紧密匹
配。OPT3006 具有强烈的红外 (IR) 排斥反应，在所有
光源条件下均可精确测量人眼的可见光强度。当设计需
要将传感器安装到深色玻璃下时，这种强烈的红外 (IR)
排斥反应还可有助于维持高精度。OPT3006 通常与背
光 IC 或照明控制系统配合使用，能够为用户构建基于
光的各项体验，可作为光电二极管、光敏电阻或低配环
境光传感器的理想替代产品。
23 位有效动态范围，
支持自动设置增益范围
•
12 种二进制权满量程范围设置：范围间匹配程度
< 0.2%（典型值）
•
•
•
•
•
•
低工作电流：1.8µA（典型值）
工作温度范围：-40°C 至 +85°C
宽电源范围：1.6V 至 3.6V
可耐受 5.5V 电压的 I/O
灵活的中断系统
凭借内置的满量程设置功能，无需手动选择满量程范围
即可在 0.01 lux 至 83k lux 范围内进行测量。此功能允
许在 23 位有效动态范围内进行光测量。
小外形尺寸：
–
0.856mm x 0.946mm x 0.226mm PicoStar™封
装
数字操作可灵活用于系统集成。测量既可连续进行也可
单次触发。控制和中断系统 具有 自主操作功能，允许
处理器在传感器搜索相应唤醒事件并通过中断引脚进行
报告时处于休眠状态。数字输出通过 I2C 以及兼容
SMBus 的双线制串口进行报告。
•
OPT3006 是 OPT3001 的缩小版
2 应用
•
•
•
•
•
•
•
智能手表
可穿戴电子产品
健身手环
OPT3006 兼具低功耗和低电源电压特性，可延长电池
供电系统的电池寿命。
显示屏背光控制
照明控制系统
平板电脑和笔记本电脑
摄像机
器件信息(1)
器件型号
OPT3006
封装
封装尺寸（标称值）
0.856mm x 0.946mm x
0.226mm
PicoStar (6)
频谱响应：OPT3006 和人眼
(1) 要了解所有可用封装，请见数据表末尾的封装选项附录。
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
OPT3006
Human Eye
方框图
VDD
VDD
OPT3006
SCL
Ambient
Light
SDA
I2C
Interface
Optical
Filter
ADC
INT
ADDR
GND
300
400
500
600
700
800
900
1000
Wavelength (nm)
D001
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
English Data Sheet: SBOS698
OPT3006
ZHCSFL9 –OCTOBER 2016
www.ti.com.cn
目录
7.6 Register Maps......................................................... 19
Application and Implementation ........................ 27
8.1 Application Information............................................ 27
8.2 Typical Application .................................................. 28
8.3 Do's and Don'ts ...................................................... 31
Power-Supply Recommendations...................... 31
1
2
3
4
5
6
特性.......................................................................... 1
8
9
应用.......................................................................... 1
说明.......................................................................... 1
修订历史记录 ........................................................... 2
Pin Configuration and Functions......................... 3
Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information.................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Timing Requirements................................................ 6
6.7 Typical Characteristics.............................................. 7
Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ...................................... 10
7.3 Feature Description................................................. 11
7.4 Device Functional Modes........................................ 13
7.5 Programming........................................................... 16
10 Layout................................................................... 32
10.1 Layout Guidelines ................................................. 32
10.2 Soldering and Handling Recommendations.......... 32
10.3 Layout Example .................................................... 34
11 器件和文档支持 ..................................................... 35
11.1 文档支持................................................................ 35
11.2 接收文档更新通知 ................................................. 35
11.3 社区资源................................................................ 35
11.4 商标....................................................................... 35
11.5 静电放电警告......................................................... 35
11.6 Glossary................................................................ 35
12 机械、封装和可订购信息....................................... 35
7
4 修订历史记录
日期
修订版本
注释
2016 年 10 月
*
最初发布。
2
Copyright © 2016, Texas Instruments Incorporated
OPT3006
www.ti.com.cn
ZHCSFL9 –OCTOBER 2016
5 Pin Configuration and Functions
YMF Package
6-Pin PicoStar
Top View
1
2
A
B
GND
SCL
Optical
Sensing
Area
ADDR
VDD
INT
C
SDA
Pin Functions
PIN
DESCRIPTION
NO.
A1
B1
C1
A2
B2
NAME
GND
ADDR
VDD
SCL
I/O
Power
Ground
Digital input Address pin. This pin sets the LSBs of the I2C address.
Power Device power. Connect to a 1.6-V to 3.6-V supply.
Digital input I2C clock. Connect with a 10-kΩ resistor to a 1.6-V to 5.5-V supply.
INT
Digital output Interrupt output open-drain. Connect with a 10-kΩ resistor to a 1.6-V to 5.5-V supply.
Digital
input/output
C2
SDA
I2C data. Connect with a 10-kΩ resistor to a 1.6-V to 5.5-V supply.
Copyright © 2016, Texas Instruments Incorporated
3
OPT3006
ZHCSFL9 –OCTOBER 2016
www.ti.com.cn
6 Specifications
6.1 Absolute Maximum Ratings(1)
MIN
–0.5
–0.5
MAX
6
UNIT
V
VDD to GND
Voltage
SDA, SCL, INT, and ADDR to GND
6
V
Current into any pin
Temperature
10
mA
°C
Junction
150
150(2)
Storage, Tstg
–65
°C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Long exposure to temperatures higher than 105°C can cause package discoloration, spectral distortion, and measurement inaccuracy.
6.2 ESD Ratings
VALUE
±2000
±500
UNIT
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)
Charged-device model (CDM), per JEDEC specification JESD22-C101(2)
Electrostatic
discharge
V(ESD)
V
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
MIN
–40
1.6
NOM
MAX
85
UNIT
°C
Operating temperature
Operating power-supply voltage
3.6
V
6.4 Thermal Information
OPT3006
THERMAL METRIC(1)
YMF (PicoStar)
UNIT
6 PINS
122.8
1.4
RθJA
RθJC(top)
RθJB
ψJT
Junction-to-ambient thermal resistance
°C/W
°C/W
°C/W
°C/W
°C/W
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
34.9
0.8
Junction-to-top characterization parameter
Junction-to-board characterization parameter
ψJB
35.3
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
4
Copyright © 2016, Texas Instruments Incorporated
OPT3006
www.ti.com.cn
ZHCSFL9 –OCTOBER 2016
6.5 Electrical Characteristics
At TA = 25°C, VDD = 3.3 V, 800-ms conversion time (CT = 1)(1), automatic full-scale range (RN[3:0] = 1100b(1)), white LED,
and normal-angle incidence of light, unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
OPTICAL
Peak irradiance spectral responsivity
Resolution (LSB)
550
0.01
nm
lux
lux
Lowest full-scale range, RN[3:0] = 0000b(1)
Full-scale illuminance
83865.6
3125
2500
1600
3750 ADC codes
0.64 lux per ADC code, 2620.80 lux full-scale
(RN[3:0] = 0110)(1), 2000 lux input(2)
Measurement output result
2000
2400
lux
Relative accuracy between gain
ranges(3)
Infrared response (850 nm)(2)
0.2%
0.2%
4%
Light source variation
(incandescent, halogen, fluorescent)
Bare device, no cover glass
Input illuminance > 40 lux
Input illuminance < 40 lux
2%
5%
0.01
0
Linearity
Measurement drift across temperature Input illuminance = 2000 lux
%/°C
ADC codes
lux
3
Dark condition, ADC output
0.01 lux per ADC code
0
0.03
Half-power angle
50% of full-power reading
VDD at 3.6 V and 1.6 V
44
degrees
%/V(4)
PSRR
Power-supply rejection ratio
0.1
POWER SUPPLY
VDD
VI²C
Operating range
1.6
1.6
3.6
5.5
2.5
V
V
Operating range of I2C pull-up resistor I2C pull-up resistor, VDD ≤ VI²C
Active, VDD = 3.6 V
Shutdown (M[1:0] = 00)(1)
VDD = 3.6 V
1.8
0.3
3.7
0.4
0.8
µA
Dark
,
0.47
µA
µA
µA
V
IQ
Quiescent current
Active, VDD = 3.6 V
Full-scale lux
TA = 25°C
Shutdown,
(M[1:0] = 00)(1)
POR
Power-on-reset threshold
DIGITAL
I/O pin capacitance
3
800
100
pF
ms
ms
(CT = 1)(1), 800-ms mode, fixed lux range
(CT = 0)(1), 100-ms mode, fixed lux range
720
90
880
110
Total integration time(5)
Low-level input voltage
(SDA, SCL, and ADDR)
VIL
VIH
IIL
0
0.3 × VDD
5.5
V
V
High-level input voltage
(SDA, SCL, and ADDR)
0.7 × VDD
Low-level input current
(SDA, SCL, and ADDR)
0.01
0.01
0.25(6)
0.32
µA
V
Low-level output voltage
(SDA and INT)
VOL
IZH
IOL= 3 mA
Pin at VDD
Output logic high, high-Z leakage
current (SDA, INT)
0.25(6)
µA
TEMPERATURE
Specified temperature range
–40
85
°C
(1) Refers to a control field within the configuration register.
(2) Tested with the white LED calibrated to 2k lux and an 850-nm LED.
(3) Characterized by measuring fixed near-full-scale light levels on the higher adjacent full-scale range setting.
(4) PSRR is the percent change of the measured lux output from its current value, divided by the change in power supply voltage, as
characterized by results from 3.6-V and 1.6-V power supplies.
(5) The conversion time, from start of conversion until the data are ready to be read, is the integration time plus 3 ms.
(6) The specified leakage current is dominated by the production test equipment limitations. Typical values are much smaller.
Copyright © 2016, Texas Instruments Incorporated
5
OPT3006
ZHCSFL9 –OCTOBER 2016
www.ti.com.cn
MAX UNIT
6.6 Timing Requirements(1)
MIN
TYP
I2C FAST MODE
fSCL
SCL operating frequency
Bus free time between stop and start
Hold time after repeated start
Setup time for repeated start
Setup time for stop
0.01
1300
600
600
600
20
0.4
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
tBUF
tHDSTA
tSUSTA
tSUSTO
tHDDAT
tSUDAT
tLOW
Data hold time
900
Data setup time
100
1300
600
SCL clock low period
tHIGH
SCL clock high period
Clock rise and fall time
Data rise and fall time
tRC and tFC
tRD and tFD
300
300
Bus timeout period. If the SCL line is held low for this duration of time, the bus
state machine is reset.
tTIMEO
28
ms
I2C HIGH-SPEED MODE
fSCL
SCL operating frequency
0.01
160
160
160
160
20
2.6
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
tBUF
Bus free time between stop and start
Hold time after repeated start
Setup time for repeated start
Setup time for stop
tHDSTA
tSUSTA
tSUSTO
tHDDAT
tSUDAT
tLOW
Data hold time
140
Data setup time
20
SCL clock low period
SCL clock high period
Clock rise and fall time
Data rise and fall time
240
60
tHIGH
tRC and tFC
tRD and tFD
40
80
Bus timeout period. If the SCL line is held low for this duration of time, the bus
state machine is reset.
tTIMEO
28
ms
(1) All timing parameters are referenced to low and high voltage thresholds of 30% and 70%, respectively, of final settled value.
1/fSCL
tRC
tFC
70%
30%
SCL
SDA
tLOW
tHIGH
tSUSTA
tSUSTO
tHDSTA
tHDDAT
tSUDAT
70%
30%
tBUF
Start
tRD
tFD
Stop
Start
Stop
Figure 1. I2C Detailed Timing Diagram
6
Copyright © 2016, Texas Instruments Incorporated
OPT3006
www.ti.com.cn
ZHCSFL9 –OCTOBER 2016
6.7 Typical Characteristics
At TA = 25°C, VDD = 3.3 V, 800-ms conversion time (CT = 1), automatic full-scale range (RN[3:0] = 1100b), white LED, and
normal-angle incidence of light, unless otherwise specified.
300
250
200
150
100
50
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
Fluorescent
Halogen
Incandescent
OPT3006
Human Eye
0
300
400
500
600
700
800
900
1000
0
50
100
150
200
250
300
Wavelength (nm)
Input Light (Lux)
D001
D002
Figure 2. Spectral Response vs Wavelength
Figure 3. Output Response vs Input Illuminance, Multiple
Light Sources (Fluorescent, Halogen, Incandescent)
100
80
60
40
20
0
16000
14000
12000
10000
8000
6000
4000
2000
0
0
2000 4000 6000 8000 10000 12000 14000 16000
Input Light (Lux)
0
20
40
60
80
100
Input Light (Lux)
D003
D004
Figure 4. Output Response vs Input Illuminance
(Higher Range = 0 lux to 16k lux)
Figure 5. Output Response vs Input Illuminance
(Mid Range = 0 lux to 100 lux)
5
4
3
2
1
1.020
1.010
1.000
0.990
0.980
1.005
1.003
1.001
1.000
1.000
1.000
0
0
1
2
3
4
5
40.95
81.9
163.8
327.6
655.2
1310.4
Input Light (Lux)
D005
D006
Full-Scale Range (Lux)
Input illuminance = 30 lux,
normalized to response of 40.95 lux full-scale
Figure 6. Output Response vs Input Illuminance
(Low Range = 0 lux to 5 lux)
Figure 7. Full-Scale-Range Matching (Lowest 7 Ranges)
Copyright © 2016, Texas Instruments Incorporated
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OPT3006
ZHCSFL9 –OCTOBER 2016
www.ti.com.cn
Typical Characteristics (continued)
At TA = 25°C, VDD = 3.3 V, 800-ms conversion time (CT = 1), automatic full-scale range (RN[3:0] = 1100b), white LED, and
normal-angle incidence of light, unless otherwise specified.
0.1
1.020
0.09
0.08
1.010
0.07
0.06
1.000
1.000 1.000
0.999
0.05
0.04
0.03
0.02
0.01
0
1.000
0.990
0.980
0.998
0.997
0.997
-40
-20
0
20
40
60
80
100
1310.4 2620.8 5241.6 10483.2 20966.4 41932.8 83865.6
Full-Scale Range (Lux)
Temperature (èC)
D0016
D007
Average of 30 devices
Input illuminance = 960 lux,
normalized to response of 2560 lux full-scale
Figure 9. Dark Response vs Temperature
Figure 8. Full-Scale-Range Matching (Highest 6 Ranges)
1.02
1000
900
800
700
600
1.01
1
0.99
0.98
0.97
-40
-20
0
20
40
60
80
100
120
1.6
2
2.4
2.8
3.2
3.6
Temperature ( èC)
Power Supply (V)
D008
D017
Figure 10. Normalized Response vs Temperature
Figure 11. Conversion Time vs Power Supply
1.002
1.001
1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.999
0.998
1.6
2
2.4
2.8
3.2
3.6
-90 -75 -60 -45 -30 -15
0
15 30 45 60 75 90
Power Supply (V)
Incidence Angle (Degrees)
D009
D010
Figure 12. Normalized Response vs Power-Supply Voltage
Figure 13. Normalized Response vs Illuminance Angle
8
Copyright © 2016, Texas Instruments Incorporated
OPT3006
www.ti.com.cn
ZHCSFL9 –OCTOBER 2016
Typical Characteristics (continued)
At TA = 25°C, VDD = 3.3 V, 800-ms conversion time (CT = 1), automatic full-scale range (RN[3:0] = 1100b), white LED, and
normal-angle incidence of light, unless otherwise specified.
0.5
0.45
0.4
4
3.5
3
0.35
0.3
2.5
2
1.5
0.25
0.2
1
100
1000
10000
100000
0
20000
40000
60000
80000
Input Illuminance (Lux)
Input Illuminance (Lux)
D011
D0112
M[1:0] = 10b
M[1:0] = 00b
Figure 14. Supply Current vs Input Illuminance
Figure 15. Shutdown Current vs Input Illuminance
3.5
3
1.6
1.4
1.2
1
Vdd = 3.3V
Vdd = 1.6V
Vdd = 3.3V
Vdd = 1.6V
2.5
2
0.8
0.6
0.4
0.2
1.5
1
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Temperature (èC)
Temperature (èC)
D013
D014
M[1:0] = 10b
M[1:0] = 00b, input illuminance = 0 lux
Figure 17. Shutdown Current vs Temperature
Figure 16. Supply Current vs Temperature
100
Vdd = 3.3V
Vdd = 1.6V
10
1
0.1
0.01
0.1
1
10
100
1000
10000
Continuous I2C Frequency (KHz)
D015
Input illuminance = 80 lux, SCL = SDA,
continuously toggled at I2C frequency
Note: A typical application runs at a lower duty cycle and thus consumes a lower current.
Figure 18. Supply Current vs Continuous I2C Frequency
Copyright © 2016, Texas Instruments Incorporated
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ZHCSFL9 –OCTOBER 2016
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7 Detailed Description
7.1 Overview
The OPT3006 measures the ambient light that illuminates the device. This device measures light with a spectral
response very closely matched to the human eye, and with very good infrared rejection.
Matching the sensor spectral response to that of the human eye response is vital because ambient light sensors
are used to measure and help create ideal human lighting experiences. Strong rejection of infrared light, which a
human does not see, is a crucial component of this matching. This matching makes the OPT3006 especially
good for operation underneath windows that are visibly dark, but infrared transmissive.
The OPT3006 is fully self-contained to measure the ambient light and report the result in lux digitally over the I2C
bus. The result can also be used to alert a system and interrupt a processor with the INT pin. The result can also
be summarized with a programmable window comparison and communicated with the INT pin.
The OPT3006 can be configured into an automatic full-scale, range-setting mode that always selects the optimal
full-scale range setting for the lighting conditions. This mode frees the user from having to program their software
for potential iterative cycles of measurement and readjustment of the full-scale range until optimal for any given
measurement. The device can be commanded to operate continuously or in single-shot measurement modes.
The device integrates its result over either 100 ms or 800 ms, so the effects of 50-Hz and 60-Hz noise sources
from typical light bulbs are nominally reduced to a minimum.
The device starts up in a low-power shutdown state, such that the OPT3006 only consumes active-operation
power after being programmed into an active state.
The OPT3006 optical filtering system is not excessively sensitive to non-ideal particles and micro-shadows on
the optical surface. This reduced sensitivity is a result of the relatively minor device dependency on uniform-
density optical illumination of the sensor area for infrared rejection. Proper optical surface cleanliness is always
recommended for best results on all optical devices.
7.2 Functional Block Diagram
VDD
VDD
OPT3006
SCL
Ambient
Light
SDA
I2C
Interface
Optical
Filter
ADC
INT
ADDR
GND
10
Copyright © 2016, Texas Instruments Incorporated
OPT3006
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ZHCSFL9 –OCTOBER 2016
7.3 Feature Description
7.3.1 Human Eye Matching
The OPT3006 spectral response closely matches that of the human eye. If the ambient light sensor
measurement is used to help create a good human experience, or create optical conditions that are optimal for a
human, the sensor must measure the same spectrum of light that a human sees.
The device also has excellent infrared light (IR) rejection. This IR rejection is especially important because many
real-world lighting sources have significant infrared content that humans do not see. If the sensor measures
infrared light that the human eye does not see, then a true human experience is not accurately represented.
Furthermore, if the ambient light sensor is hidden underneath a dark window (such that the end-product user
cannot see the sensor) the infrared rejection of the OPT3006 becomes significantly more important because
many dark windows attenuate visible light but transmit infrared light. This attenuation of visible light and lack of
attenuation of IR light amplifies the ratio of the infrared light to visible light that illuminates the sensor. Results
can still be well matched to the human eye under this condition because of the high infrared rejection of the
OPT3006.
7.3.2 Automatic Full-Scale Range Setting
The OPT3006 has an automatic full-scale range setting feature that eliminates the need to predict and set the
optimal range for the device. In this mode, the OPT3006 automatically selects the optimal full-scale range for the
given lighting condition. The OPT3006 has a high degree of result matching between the full-scale range
settings. This matching eliminates the problem of varying results or the need for range-specific, user-calibrated
gain factors when different full-scale ranges are chosen. For further details, see the Automatic Full-Scale Setting
Mode section.
7.3.3 Interrupt Operation, INT Pin, and Interrupt Reporting Mechanisms
The device has an interrupt reporting system that allows the processor connected to the I2C bus to go to sleep,
or otherwise ignore the device results, until a user-defined event occurs that requires possible action.
Alternatively, this same mechanism can also be used with any system that can take advantage of a single digital
signal that indicates whether the light is above or below levels of interest.
The interrupt event conditions are controlled by the high-limit and low-limit registers, as well as the configuration
register latch and fault count fields. The results of comparing the result register with the high-limit register and
low-limit register are referred to as fault events. The fault count register dictates how many consecutive same-
result fault events are required to trigger an interrupt event and subsequently change the state of the interrupt
reporting mechanisms, which are the INT pin, the flag high field, and the flag low field. The latch field allows a
choice between a latched window-style comparison and a transparent hysteresis-style comparison.
The INT pin has an open-drain output, which requires the use of a pull-up resistor. This open-drain output allows
multiple devices with open-drain INT pins to be connected to the same line, thus creating a logical NOR or AND
function between the devices. The polarity of the INT pin can be controlled with the polarity of interrupt field in
the configuration register. When the POL field is set to 0, the pin operates in an active low behavior that pulls the
pin low when the INT pin becomes active. When the POL field is set to 1, the pin operates in an active high
behavior and becomes high impedance, thus allowing the pin to go high when the INT pin becomes active.
Additional details of the interrupt reporting registers are described in the Interrupt Reporting Mechanism Modes
and Internal Registers sections.
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Feature Description (continued)
7.3.4 I2C Bus Overview
The OPT3006 offers compatibility with both I2C and SMBus interfaces. The I2C and SMBus protocols are
essentially compatible with one another. The I2C interface is used throughout this document as the primary
example with the SMBus protocol specified only when a difference between the two protocols is discussed.
The OPT3006 is connected to the bus with two pins: an SCL clock input pin and an SDA open-drain bidirectional
data pin. The bus must be controlled by a master device that generates the serial clock (SCL), controls the bus
access, and generates start and stop conditions. To address a specific device, the master initiates a start
condition by pulling the data signal line (SDA) from a high logic level to a low logic level while SCL is high. All
slaves on the bus shift in the slave address byte on the SCL rising edge, with the last bit indicating whether a
read or write operation is intended. During the ninth clock pulse, the slave being addressed responds to the
master by generating an acknowledge bit by pulling SDA low.
Data transfer is then initiated and eight bits of data are sent, followed by an acknowledge bit. During data
transfer, SDA must remain stable while SCL is high. Any change in SDA while SCL is high is interpreted as a
start or stop condition. When all data are transferred, the master generates a stop condition, indicated by pulling
SDA from low to high while SCL is high. The OPT3006 includes a 28-ms timeout on the I2C interface to prevent
locking up the bus. If the SCL line is held low for this duration of time, the bus state machine is reset.
7.3.4.1 Serial Bus Address
To communicate with the OPT3006, the master must first initiate an I2C start command. Then, the master must
address slave devices via a slave address byte. The slave address byte consists of seven address bits and a
direction bit that indicates whether the action is to be a read or write operation.
Four I2C addresses are possible by connecting the ADDR pin to one of four pins: GND, VDD, SDA, or SCL.
Table 1 summarizes the possible addresses with the corresponding ADDR pin configuration. The state of the
ADDR pin is sampled on every bus communication and must be driven or connected to the desired level before
any activity on the interface occurs.
Table 1. Possible I2C Addresses with Corresponding ADDR Configuration
DEVICE I2C ADDRESS
ADDR PIN
GND
1000100
1000101
VDD
1000110
SDA
1000111
SCL
7.3.4.2 Serial Interface
The OPT3006 operates as a slave device on both the I2C bus and SMBus. Connections to the bus are made via
the SCL clock input line and the SDA open-drain I/O line. The OPT3006 supports the transmission protocol for
standard mode (up to 100 kHz), fast mode (up to 400 kHz), and high-speed mode (up to 2.6 MHz). All data bytes
are transmitted most-significant bits first.
The SDA and SCL pins feature integrated spike-suppression filters and Schmitt triggers to minimize the effects of
input spikes and bus noise. See the Electrical Interface section for further details of the I2C bus noise immunity.
12
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7.4 Device Functional Modes
7.4.1 Automatic Full-Scale Setting Mode
The OPT3006 has an automatic full-scale-range setting mode that eliminates the need for a user to predict and
set the optimal range for the device. This mode is entered when the configuration register range number field
(RN[3:0]) is set to 1100b.
The first measurement that the device takes in auto-range mode is a 10-ms range assessment measurement.
The device then determines the appropriate full-scale range to take its first full measurement.
For subsequent measurements, the full-scale range is set by the result of the previous measurement. If a
measurement is towards the low side of full-scale, the full-scale range is decreased by one or two settings for the
next measurement. If a measurement is towards the upper side of full-scale, the full-scale range is increased by
one setting for the next measurement.
If the measurement exceeds the full-scale range, resulting from a fast increasing optical transient event, the
current measurement is aborted. This invalid measurement is not reported. A 10-ms measurement is taken to
assess and properly reset the full-scale range. Then, a new measurement is taken with this proper full-scale
range. Therefore, during a fast increasing optical transient in this mode, a measurement can possibly take longer
to complete and report than indicated by the configuration register conversion time field (CT).
7.4.2 Interrupt Reporting Mechanism Modes
There are two major types of interrupt reporting mechanism modes: latched window-style comparison mode and
transparent hysteresis-style comparison mode. The configuration register latch field (L) (see the configuration
register, bit 4) controls which of these two modes is used. An end-of-conversion mode is also associated with
each major mode type. The end-of-conversion mode is active when the two most significant bits of the threshold
low register are set to 11b. The mechanisms report via the flag high and flag low fields, the conversion ready
field, and the INT pin.
7.4.2.1 Latched Window-Style Comparison Mode
The latched window-style comparison mode is typically selected when using the OPT3006 to interrupt an
external processor. In this mode, a fault is recognized when the input signal is above the high-limit register or
below the low-limit register. When the consecutive fault events trigger the interrupt reporting mechanisms, these
mechanisms are latched, thus reporting whether the fault is the result of a high or low comparison. These
mechanisms remain latched until the configuration register is read, which clears the INT pin and flag high and
flag low fields. The SMBus alert response protocol, described in detail in the SMBus Alert Response section,
clears the pin but does not clear the flag high and flag low fields. The behavior of this mode, along with the
conversion ready flag, is summarized in Table 2. Note that Table 2 does not apply when the two threshold low
register MSBs (see the Transparent Hysteresis-Style Comparison Mode section for clarification on the MSBs) are
set to 11b.
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Device Functional Modes (continued)
Table 2. Latched Window-Style Comparison Mode: Flag Setting and Clearing Summary(1)(2)
FLAG HIGH
FIELD
FLAG LOW
FIELD
CONVERSION
READY FIELD
OPERATION
INT PIN(3)
The result register is above the high-limit register for fault count times.
See the Result Register and the High-Limit Register for further details.
1
X
1
Active
1
1
The result register is below the low-limit register for fault count times.
See the Result Register and the Low-Limit Register for further details.
X
Active
The conversion is complete with fault count criterion not met
Configuration register read(4)
X
0
X
0
X
Inactive
X
1
0
Configuration register write, M[1:0] = 00b (shutdown)
Configuration register write, M[1:0] > 00b (not shutdown)
SMBus alert response protocol
X
X
X
X
X
X
X
0
X
Inactive
X
(1) X = no change from the previous state.
(2) The high-limit register is assumed to be greater than the low-limit register. If this assumption is incorrect, the flag high field and flag low
field can take on different behaviors.
(3) The INT pin depends on the setting of the polarity field (POL). The INT pin is low when the pin state is active and POL = 0 (active low)
or when the pin state is inactive and POL = 1 (active high).
(4) Immediately after the configuration register is read, the device automatically resets the conversion ready field to its 0 state. Thus, if two
configuration register reads are performed immediately after a conversion completion, the first reads 1 and the second reads 0.
7.4.2.2 Transparent Hysteresis-Style Comparison Mode
The transparent hysteresis-style comparison mode is typically used when a single digital signal is desired that
indicates whether the input light is higher than or lower than a light level of interest. If the result register is higher
than the high-limit register for a consecutive number of events set by the fault count field, the INT line is set to
active, the flag high field is set to 1, and the flag low field is set to 0. If the result register is lower than the low-
limit register for a consecutive number of events set by the fault count field, the INT line is set to inactive, the flag
low field is set to 1, and the flag high field is set to 0. The INT pin and flag high and flag low fields do not change
state with configuration reads and writes. The INT pin and flag fields continually report the appropriate
comparison of the light to the low-limit and high-limit registers. The device does not respond to the SMBus alert
response protocol while in either of the two transparent comparison modes (configuration register, latch field =
0). The behavior of this mode, along with the conversion ready is summarized in Table 3. Note that Table 3 does
not apply when the two threshold low register MSBs (LE[3:2] from Table 11) are set to 11.
Table 3. Transparent Hysteresis-Style Comparison Mode: Flag Setting and Clearing Summary(1)(2)
FLAG HIGH
FIELD
FLAG LOW
FIELD
CONVERSION
READY FIELD
OPERATION
INT PIN(3)
The result register is above the high-limit register for fault count times.
See the Result Register and the High-Limit Register for further details.
1
0
0
1
Active
1
1
The result register is below the low-limit register for fault count times.
See the Result Register and the Low-Limit Register for further details.
Inactive
The conversion is complete with fault count criterion not met
Configuration register read(4)
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
1
0
Configuration register write, M[1:0] = 00b (shutdown)
Configuration register write, M[1:0] > 00b (not shutdown)
SMBus alert response protocol
X
0
X
(1) X = no change from the previous state.
(2) The high-limit register is assumed to be greater than the low-limit register. If this assumption is incorrect, the flag high field and flag low
field can take on different behaviors.
(3) The INT pin depends on the setting of the polarity field (POL). The INT pin is low when the pin state is active and POL = 0 (active low)
or when the pin state is inactive and POL = 1 (active high).
(4) Immediately after the configuration register is read, the device automatically resets the conversion ready field to its 0 state. Thus, if two
configuration register reads are performed immediately after a conversion completion, the first reads 1 and the second reads 0.
14
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7.4.2.3 End-of-Conversion Mode
An end-of-conversion indicator mode can be used when every measurement is desired to be read by the
processor, prompted by the INT pin going active on every measurement completion. This mode is entered by
setting the most significant two bits of the low-limit register (LE[3:2] from the Low-Limit Register) to 11b. This
end-of-conversion mode is typically used in conjunction with the latched window-style comparison mode. The INT
pin becomes inactive when the configuration register is read or the configuration register is written with a non-
shutdown parameter or in response to an SMBus alert response. Table 4 summarizes the interrupt reporting
mechanisms as a result of various operations.
Table 4. End-of-Conversion Mode while in Latched Window-Style Comparison Mode:
Flag Setting and Clearing Summary(1)
FLAG HIGH
FIELD
FLAG LOW
FIELD
CONVERSION
READY FIELD
OPERATION
INT PIN(2)
The result register is above the high-limit register for fault count times.
See the Result Register and the High-Limit Register for further details.
1
X
1
Active
1
1
The result register is below the low-limit register for fault count times.
See the Result Register and the Low-Limit Register for further details.
X
Active
The conversion is complete with fault count criterion not met
Configuration register read(3)
X
0
X
0
Active
Inactive
X
1
0
Configuration register write, M[1:0] = 00b (shutdown)
Configuration register write, M[1:0] > 00b (not shutdown)
SMBus alert response protocol
X
X
X
X
X
X
X
0
X
Inactive
X
(1) X = no change from the previous state.
(2) The INT pin depends on the setting of the polarity field (POL). The INT pin is low when the pin state is active and POL = 0 (active low)
or when the pin state is inactive and POL = 1 (active high).
(3) Immediately after the configuration register is read, the device automatically resets the conversion ready field to its 0 state. Thus, if two
configuration register reads are performed immediately after a conversion completion, the first reads 1 and the second reads 0.
Note that when transitioning from end-of-conversion mode to the standard comparison modes (that is,
programming LE[3:2] from 11b to 00b) while the configuration register latch field (L) is 1, a subsequent write to
the configuration register latch field (L) to 0 is necessary in order to properly clear the INT pin. The latch field can
then be set back to 1 if desired.
7.4.2.4 End-of-Conversion and Transparent Hysteresis-Style Comparison Mode
The combination of end-of-conversion mode and transparent hysteresis-style comparison mode can also be
programmed simultaneously. The behavior of this combination is shown in Table 5.
Table 5. End-Of-Conversion Mode while in Transparent Hysteresis-Style Comparison Mode:
Flag Setting and Clearing Summary(1)
FLAG HIGH
FIELD
FLAG LOW
FIELD
CONVERSION
READY FIELD
OPERATION
INT PIN(2)
The result register is above the high-limit register for fault count times.
See the Result Register and the High-Limit Register for further details.
1
0
0
1
Active
1
1
The result register is below the low-limit register for fault count times.
See the Result Register and the Low-Limit Register for further details.
Active
The conversion is complete with fault count criterion not met
Configuration register read(3)
X
X
X
X
X
X
X
X
X
X
Active
Inactive
X
1
0
Configuration register write, M[1:0] = 00b (shutdown)
Configuration register write, M[1:0] > 00b (not shutdown)
SMBus alert response protocol
X
0
Inactive
X
X
(1) X = no change from the previous state.
(2) The INT pin depends on the setting of the polarity field (POL). The INT pin is low when the pin state is active and POL = 0 (active low)
or when the pin state is inactive and POL = 1 (active high).
(3) Immediately after the configuration register is read, the device automatically resets the conversion ready field to its 0 state. Thus, if two
configuration register reads are performed immediately after a conversion completion, the first reads 1 and the second reads 0.
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7.5 Programming
The OPT3006 supports the transmission protocol for standard mode (up to 100 kHz), fast mode (up to 400 kHz),
and high-speed mode (up to 2.6 MHz). Fast and standard modes are described as the default protocol, referred
to as F/S. High-speed mode is described in the High-Speed I2C Mode section.
7.5.1 Writing and Reading
Accessing a specific register on the OPT3006 is accomplished by writing the appropriate register address during
the I2C transaction sequence. Refer to Table 6 for a complete list of registers and their corresponding register
addresses. The value for the register address (as shown in Figure 19) is the first byte transferred after the slave
address byte with the R/W bit low.
1
9
1
9
SCL
SDA
RA RA RA RA RA RA RA RA
1
0
0
0
1
A1 A0 R/W
7
6
5
4
3
2
1
0
Stop by
Master
Start by
Master
ACK by
Device
ACK by
Device
(optional)
Frame 1: Two-Wire Slave Address Byte (1)
Frame 2: Register Address Byte
(1) The value of the slave address byte is determined by the ADDR pin setting; see Table 1.
Figure 19. Setting the I2C Register Address
Writing to a register begins with the first byte transmitted by the master. This byte is the slave address with the
R/W bit low. The OPT3006 then acknowledges receipt of a valid address. The next byte transmitted by the
master is the address of the register that data are to be written to. The next two bytes are written to the register
addressed by the register address. The OPT3006 acknowledges receipt of each data byte. The master may
terminate the data transfer by generating a start or stop condition.
When reading from the OPT3006, the last value stored in the register address by a write operation determines
which register is read during a read operation. To change the register address for a read operation, a new partial
I2C write transaction must be initiated. This partial write is accomplished by issuing a slave address byte with the
R/W bit low, followed by the register address byte and a stop command. The master then generates a start
condition and sends the slave address byte with the R/W bit high to initiate the read command. The next byte is
transmitted by the slave and is the most significant byte of the register indicated by the register address. This
byte is followed by an acknowledge from the master; then the slave transmits the least significant byte. The
master acknowledges receipt of the data byte. The master may terminate the data transfer by generating a not-
acknowledge after receiving any data byte, or by generating a start or stop condition. If repeated reads from the
same register are desired, continually sending the register address bytes is not necessary; the OPT3006 retains
the register address until that number is changed by the next write operation.
16
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Programming (continued)
Figure 20 and Figure 21 show the write and read operation timing diagrams, respectively. Note that register
bytes are sent most significant byte first, followed by the least significant byte.
1
9
1
9
1
9
1
9
SCL
RA RA RA RA RA RA RA RA
SDA
1
0
0
0
1
A1 A0 R/W
D15 D14 D13 D12 D11 D10 D9 D8
D7 D6 D5 D4 D3 D2 D1 D0
7
6
5
4
3
2
1
0
Start by
Master
ACK by
Device
ACK by
Device
ACK by
Device
Stop by
Master
ACK by
Device
Frame 1 Two-Wire Slave Address Byte (1)
Frame 2 Register Address Byte
Frame 3 Data MSByte
Frame 4 Data LSByte
(1) The value of the slave address byte is determined by the setting of the ADDR pin; see Table 1.
Figure 20. I2C Write Example
1
9
1
9
1
9
SCL
SDA
R/W
1
0
0
0
1
A1 A0
D15 D14 D13 D12 D11 D10 D9 D8
D7 D6 D5 D4 D3 D2 D1 D0
From Device
No ACK
by
Master(2)
Stop by
Master
Start by
Master
ACK by
Device
From
Device
ACK by
Master
Frame 1 Two-Wire Slave Address Byte (1)
Frame 2 Data MSByte
Frame 3 Data LSByte
(1) The value of the slave address byte is determined by the ADDR pin setting; see Table 1.
(2) An ACK by the master can also be sent.
Figure 21. I2C Read Example
7.5.1.1 High-Speed I2C Mode
When the bus is idle, both the SDA and SCL lines are pulled high by the pull-up resistors or active pull-up
devices. The master generates a start condition followed by a valid serial byte containing the high-speed (HS)
master code 0000 1XXXb. This transmission is made in either standard mode or fast mode (up to 400 kHz). The
OPT3006 does not acknowledge the HS master code but does recognize the code and switches its internal filters
to support a 2.6-MHz operation.
The master then generates a repeated start condition (a repeated start condition has the same timing as the start
condition). After this repeated start condition, the protocol is the same as F/S mode, except that transmission
speeds up to 2.6 MHz are allowed. Instead of using a stop condition, use repeated start conditions to secure the
bus in HS mode. A stop condition ends the HS mode and switches all internal filters of the OPT3006 to support
the F/S mode.
7.5.1.2 General-Call Reset Command
The I2C general-call reset allows the host controller in one command to reset all devices on the bus that respond
to the general-call reset command. The general call is initiated by writing to the I2C address 0 (0000 0000b). The
reset command is initiated when the subsequent second address byte is 06h (0000 0110b). With this transaction,
the device issues an acknowledge bit and sets all of its registers to the power-on-reset default condition.
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Programming (continued)
7.5.1.3 SMBus Alert Response
The SMBus alert response provides a quick identification for which device issued the interrupt. Without this alert
response capability, the processor does not know which device pulled the interrupt line when there are multiple
slave devices connected.
The OPT3006 is designed to respond to the SMBus alert response address, when in the latched window-style
comparison mode (configuration register, latch field = 1). The OPT3006 does not respond to the SMBus alert
response when in transparent mode (configuration register, latch field = 0).
The response behavior of the OPT3006 to the SMBus alert response is shown in Figure 22. When the interrupt
line to the processor is pulled to active, the master can broadcast the alert response slave address (0001
1001b). Following this alert response, any slave devices that generated an alert identify themselves by
acknowledging the alert response and sending their respective I2C address on the bus. The alert response can
activate several different slave devices simultaneously. If more than one slave attempts to respond, bus
arbitration rules apply. The device with the lowest address wins the arbitration. If the OPT3006 loses the
arbitration, the device does not acknowledge the I2C transaction and its INT pin remains in an active state,
prompting the I2C master processor to issue a subsequent SMBus alert response. When the OPT3006 wins the
arbitration, the device acknowledges the transaction and sets its INT pin to inactive. The master can issue that
same command again, as many times as necessary to clear the INT pin. See the Interrupt Reporting Mechanism
Modes section for additional details of how the flags and INT pin are controlled. The master can obtain
information about the source of the OPT3006 interrupt from the address broadcast in the above process. The
flag high field (configuration register, bit 6) is sent as the final LSB of the address to provide the master additional
information about the cause of the OPT3006 interrupt. If the master requires additional information, the result
register or the configuration register can be queried. The flag high and flag low fields are not cleared upon an
SMBus alert response.
INT
1
9
1
9
SCL
SDA
FH(1)
0
0
0
1
1
0
0
R/W
1
0
0
0
1
A1
A0
Start By
Master
ACK By
Device
From
Device
NACK By Stop By
Master Master
Frame 2 Slave Address Byte(2)
Frame 1 SMBus ALERT Response Address Byte
(1) FH is the flag high field (FH) in the configuration register (see Table 10).
(2) A1 and A0 are determined by the ADDR pin; see Table 1.
Figure 22. Timing Diagram for SMBus Alert Response
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7.6 Register Maps
7.6.1 Internal Registers
The device is operated over the I2C bus with registers that contain configuration, status, and result information. All registers are 16 bits long.
There are four main registers: result, configuration, low-limit, and high-limit. There are also two ID registers: manufacturer ID and device ID. Table 6 lists
these registers.
Table 6. Register Map
ADDRESS
REGISTER
BIT 15 BIT 14 BIT 13 BIT 12 BIT 11 BIT 10
BIT 9
BIT 8
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
(Hex)(1)
00h
Result
Configuration
Low Limit
E3
RN3
LE3
E2
RN2
LE2
E1
RN1
LE1
E0
RN0
LE0
R11
CT
R10
M1
R9
M0
R8
OVF
TL8
TH8
ID8
R7
CRF
TL7
TH7
ID7
R6
FH
R5
FL
R4
L
R3
POL
TL3
TH3
ID3
R2
ME
R1
FC1
TL1
TH1
ID1
R0
FC0
TL0
TH0
ID0
01h
02h
TL11
TH11
ID11
DID11
TL10
TH10
ID10
DID10
TL9
TH9
ID9
TL6
TH6
ID6
TL5
TH5
ID5
TL4
TH4
ID4
DID4
TL2
TH2
ID2
High Limit
03h
HE3
ID15
DID15
HE2
ID14
DID14
HE1
ID13
DID13
HE0
ID12
DID12
Manufacturer ID
Device ID
7Eh
7Fh
DID9
DID8
DID7
DID6
DID5
DID3
DID2
DID1
DID0
(1) Register offset and register address are used interchangeably.
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7.6.1.1 Register Descriptions
NOTE
Register offset and register address are used interchangeably.
7.6.1.1.1 Result Register (offset = 00h)
This register contains the result of the most recent light to digital conversion. This 16-bit register has two fields: a
4-bit exponent and a 12-bit mantissa.
Figure 23. Result Register (Read-Only)
15
E3
R
14
E2
R
13
E1
R
12
E0
R
11
R11
R
10
R10
R
9
R9
R
8
R8
R
7
R7
R
6
R6
R
5
R5
R
4
R4
R
3
R3
R
2
R2
R
1
R1
R
0
R0
R
LEGEND: R = Read only
Table 7. Result Register Field Descriptions
Bit
Field
Type
Reset
Description
Exponent.
15:12
E[3:0]
R
0h
These bits are the exponent bits. Table 8 provides further details.
Fractional result.
These bits are the result in straight binary coding (zero to full-scale).
11:0
R[11:0]
R
000h
Table 8. Full-Scale Range and LSB Size as a Function of Exponent Level
E3
0
0
0
0
0
0
0
0
1
1
1
1
E2
0
0
0
0
1
1
1
1
0
0
0
0
E1
0
0
1
1
0
0
1
1
0
0
1
1
E0
0
1
0
1
0
1
0
1
0
1
0
1
FULL-SCALE RANGE (lux)
40.95
LSB SIZE (lux per LSB)
0.01
0.02
0.04
0.08
0.16
0.32
0.64
1.28
2.56
5.12
10.24
20.48
81.90
163.80
327.60
655.20
1310.40
2620.80
5241.60
10483.20
20966.40
41932.80
83865.60
The formula to translate this register into lux is given in Equation 1:
lux = LSB_Size × R[11:0]
(1)
(2)
(3)
where:
LSB_Size = 0.01 × 2E[3:0]
LSB_Size can also be taken from Table 8. The complete lux equation is shown in Equation 3:
lux = 0.01 × (2E[3:0]) × R[11:0]
A series of result register output examples with the corresponding LSB weight and resulting lux are given in
Table 9. Note that many combinations of exponents (E[3:0]) and fractional results (R[11:0]) can map onto the
same lux result, as shown in the examples of Table 9.
20
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Table 9. Examples of Decoding the Result Register into lux
FRACTIONAL
RESULT
(R[11:0], Hex)
RESULT REGISTER
(Bits 15:0, Binary)
EXPONENT
(E[3:0], Hex)
LSB WEIGHT
(lux, Decimal)
RESULTING LUX
(Decimal)
0000 0000 0000 0001b
0000 1111 1111 1111b
0011 0100 0101 0110b
0111 1000 1001 1010b
1000 1000 0000 0000b
1001 0100 0000 0000b
1010 0010 0000 0000b
1011 0001 0000 0000b
1011 0000 0000 0001b
1011 1111 1111 1111b
00h
00h
03h
07h
08h
09h
0Ah
0Bh
0Bh
0Bh
001h
FFFh
456h
89Ah
800h
400h
200h
100h
001h
FFFh
0.01
0.01
0.01
40.95
0.08
88.80
1.28
2818.56
5242.88
5242.88
5242.88
5242.88
20.48
2.56
5.12
10.24
20.48
20.48
20.48
83865.60
Note that the exponent field can be disabled (set to zero) by enabling the exponent mask (configuration register,
ME field = 1) and manually programming the full-scale range (configuration register, RN[3:0] < 1100b (0Ch)),
allowing for simpler operation in a manually-programmed, full-scale mode. Calculating lux from the result register
contents only requires multiplying the result register by the LSB weight (in lux) associated with the specific
programmed full-scale range (see Table 8). See the Low-Limit Register for details.
See the configuration register conversion time field (CT, bit 11) description for more information on lux resolution
as a function of conversion time.
7.6.1.1.2 Configuration Register (offset = 01h) [reset = C810h]
This register controls the major operational modes of the device. This register has 11 fields, which are
documented below. If a measurement conversion is in progress when the configuration register is written, the
active measurement conversion immediately aborts. If the new configuration register directs a new conversion,
that conversion is subsequently started.
Figure 24. Configuration Register
15
14
13
12
11
CT
10
M1
9
8
OVF
R
RN3
R/W
RN2
R/W
RN1
R/W
RN0
R/W
M0
R/W
R/W
R/W
7
CRF
R
6
FH
R
5
FL
R
4
L
3
2
1
0
POL
R/W
ME
R/W
FC1
R/W
FC0
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only
Table 10. Configuration Register Field Descriptions
Bit
Field
Type
Reset
Description
Range number field (read or write).
The range number field selects the full-scale lux range of the device. The format of this field is
the same as the result register exponent field (E[3:0]); see Table 8. When RN[3:0] is set to
1100b (0Ch), the device operates in automatic full-scale setting mode, as described in the
Automatic Full-Scale Setting Mode section. In this mode, the automatically chosen range is
reported in the result exponent (register 00h, E[3:0]).
15:12
RN[3:0]
R/W
1100b
The device powers up as 1100 in automatic full-scale setting mode. Codes 1101b, 1110b, and
1111b (0Dh, 0Eh, and 0Fh) are reserved for future use.
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Table 10. Configuration Register Field Descriptions (continued)
Bit
Field
Type
Reset
Description
Conversion time field (read or write).
The conversion time field determines the length of the light to digital conversion process. The
choices are 100 ms and 800 ms. A longer integration time allows for a lower noise
measurement.
The conversion time also relates to the effective resolution of the data conversion process. The
800-ms conversion time allows for the fully specified lux resolution. The 100-ms conversion
time with full-scale ranges above 0101b for E[3:0] in the result and configuration registers also
allows for the fully specified lux resolution. The 100-ms conversion time with full-scale ranges
below and including 0101b for E[3:0] can reduce the effective result resolution by up to three
bits, as a function of the selected full-scale range. Range 0101b reduces by one bit. Ranges
0100b, 0011b, 0010b, and 0001b reduces by two bits. Range 0000b reduces by three bits.
The result register format and associated LSB weight does not change as a function of the
conversion time.
11
CT
R/W
1b
0 = 100 ms
1 = 800 ms
Mode of conversion operation field (read or write).
The mode of conversion operation field controls whether the device is operating in continuous
conversion, single-shot, or low-power shutdown mode. The default is 00b (shutdown mode),
such that upon power-up, the device only consumes operational level power after appropriately
programming the device.
When single-shot mode is selected by writing 01b to this field, the field continues to read 01b
while the device is actively converting. When the single-shot conversion is complete, the mode
of conversion operation field is automatically set to 00b and the device is shut down.
When the device enters shutdown mode, either by completing a single-shot conversion or by a
manual write to the configuration register, there is no change to the state of the reporting flags
(conversion ready, flag high, flag low) or the INT pin. These signals are retained for
subsequent read operations while the device is in shutdown mode.
00 = Shutdown (default)
10:9
M[1:0]
R/W
00b
01 = Single-shot
10, 11 = Continuous conversions
Overflow flag field (read-only).
The overflow flag field indicates when an overflow condition occurs in the data conversion
process, typically because the light illuminating the device exceeds the programmed full-scale
range of the device. Under this condition OVF is set to 1, otherwise OVF remains at 0. The
field is reevaluated on every measurement.
If the full-scale range is manually set (RN[3:0] field < 1100b), the overflow flag field can be set
while the result register reports a value less than full-scale. This result occurs if the input light
has a temporary high spike level that temporarily overloads the integrating ADC converter
circuitry but returns to a level within range before the conversion is complete. Thus, the
overflow flag reports a possible error in the conversion process. This behavior is common to
integrating-style converters.
8
OVF
R
0b
If the full-scale range is automatically set (RN[3:0] field = 1100b), the only condition that sets
the overflow flag field is if the input light is beyond the full-scale level of the entire device.
When there is an overflow condition and the full-scale range is not at maximum, the OPT3006
aborts its current conversion, sets the full-scale range to a higher level, and starts a new
conversion. The flag is set at the end of the process. This process repeats until there is either
no overflow condition or until the full-scale range is set to its maximum range.
Conversion ready field (read-only).
The conversion ready field indicates when a conversion completes. The field is set to 1 at the
end of a conversion and is cleared (set to 0) when the configuration register is subsequently
read or written with any value except one containing the shutdown mode (mode of operation
field, M[1:0] = 00b). Writing a shutdown mode does not affect the state of this field; see the
Interrupt Reporting Mechanism Modes section for more details.
7
6
5
CRF
FH
R
R
R
0b
0b
0b
Flag high field (read-only).
The flag high field (FH) identifies that the result of a conversion is larger than a specified level
of interest. FH is set to 1 when the result is larger than the level in the high-limit register
(register address 03h) for a consecutive number of measurements defined by the fault count
field (FC[1:0]). See the Interrupt Reporting Mechanism Modes section for more details on
clearing and other behaviors of this field.
Flag low field (read-only).
The flag low field (FL) identifies that the result of a conversion is smaller than a specified level
of interest. FL is set to 1 when the result is smaller than the level in the low-limit register
(register address 02h) for a consecutive number of measurements defined by the fault count
field (FC[1:0]). See the Interrupt Reporting Mechanism Modes section for more details on
clearing and other behaviors of this field.
FL
22
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Table 10. Configuration Register Field Descriptions (continued)
Bit
Field
Type
Reset
Description
Latch field (read or write).
The latch field controls the functionality of the interrupt reporting mechanisms: the INT pin, the
flag high field (FH), and flag low field (FL). This bit selects the reporting style between a
latched window-style comparison and a transparent hysteresis-style comparison.
0 = The device functions in transparent hysteresis-style comparison operation, where the three
interrupt reporting mechanisms directly reflect the comparison of the result register with the
high- and low-limit registers with no user-controlled clearing event. See the Interrupt Operation,
INT Pin, and Interrupt Reporting Mechanisms section for further details.
4
L
R/W
1b
1 = The device functions in latched window-style comparison operation, latching the interrupt
reporting mechanisms until a user-controlled clearing event.
Polarity field (read or write).
The polarity field controls the polarity or active state of the INT pin.
0 = The INT pin reports active low, pulling the pin low upon an interrupt event.
1 = Operation of the INT pin is inverted, where the INT pin reports active high, becoming high
impedance and allowing the INT pin to be pulled high upon an interrupt event.
3
2
POL
ME
R/W
R/W
0b
0b
Mask exponent field (read or write).
The mask exponent field forces the result register exponent field (register 00h, bits E[3:0]) to
0000b when the full-scale range is manually set, which can simplify the processing of the
result register when the full-scale range is manually programmed. This behavior occurs when
the mask exponent field is set to 1 and the range number field (RN[3:0]) is set to less than
1100b. Note that the masking is only performed to the result register. When using the interrupt
reporting mechanisms, the result comparison with the low-limit and high-limit registers is
unaffected by the ME field.
Fault count field (read or write).
The fault count field instructs the device as to how many consecutive fault events are required
to trigger the interrupt reporting mechanisms: the INT pin, the flag high field (FH), and flag low
field (FL). The fault events are described in the latch field (L), flag high field (FH), and flag low
1:0
FC[1:0]
R/W
00b
field (FL) descriptions.
00 = One fault count (default)
01 = Two fault counts
10 = Four fault counts
11 = Eight fault counts
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7.6.1.1.3 Low-Limit Register (offset = 02h) [reset = C0000h]
This register sets the lower comparison limit for the interrupt reporting mechanisms: the INT pin, the flag high
field (FH), and flag low field (FL), as described in the Interrupt Reporting Mechanism Modes section.
Figure 25. Low-Limit Register
15
14
13
12
11
10
9
8
LE3
R/W
LE2
R/W
LE1
R/W
LE0
R/W
TL11
R/W
TL10
R/W
TL9
R/W
TL8
R/W
7
6
5
4
3
2
1
0
TL7
R/W
TL6
R/W
TL5
R/W
TL4
R/W
TL3
R/W
TL2
R/W
TL1
R/W
TL0
R/W
LEGEND: R/W = Read/Write
Table 11. Low-Limit Register Field Descriptions
Bit
Field
Type
Reset
Description
Exponent.
15:12
LE[3:0]
R/W
0h
These bits are the exponent bits. Table 12 provides further details.
Result.
11:0
TL[11:0]
R/W
000h
These bits are the result in straight binary coding (zero to full-scale).
The format of this register is nearly identical to the format of the result register described in the Result Register.
The low-limit register exponent (LE[3:0]) is similar to the result register exponent (E[3:0]). The low-limit register
result (TL[11:0]) is similar to result register result (R[11:0]).
The equation to translate this register into the lux threshold is given in Equation 4, which is similar to the
equation for the result register, Equation 3.
lux = 0.01 × (2LE[3:0]) × TL[11:0]
(4)
Table 12 gives the full-scale range and LSB size as it applies to the low-limit register. The detailed discussion
and examples given in for the Result Register apply to the low-limit register as well.
Table 12. Full-Scale Range and LSB Size as a Function of Exponent Level
LE3
0
LE2
0
LE1
0
LE0
0
FULL-SCALE RANGE (lux)
40.95
LSB SIZE (lux per LSB)
0.01
0.02
0.04
0.08
0.16
0.32
0.64
1.28
2.56
5.12
10.24
20.48
0
0
0
1
81.90
0
0
1
0
163.80
0
0
1
1
327.60
0
1
0
0
655.20
0
1
0
1
1310.40
0
1
1
0
2620.80
0
1
1
1
5241.60
1
0
0
0
10483.20
20966.40
41932.80
83865.60
1
0
0
1
1
0
1
0
1
0
1
1
NOTE
The result and limit registers are all converted into lux values internally for comparison.
These registers can have different exponent fields. However, when using a manually-set
full-scale range (configuration register, RN < 0Ch, with mask enable (ME) active),
programming the manually-set full-scale range into the LE[3:0] and HE[3:0] fields can
simplify the choice of programming the register. This simplification results in the user only
having to think about the fractional result and not the exponent part of the result.
24
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7.6.1.1.4 High-Limit Register (offset = 03h) [reset = BFFFh]
The high-limit register sets the upper comparison limit for the interrupt reporting mechanisms: the INT pin, the
flag high field (FH), and flag low field (FL), as described in the Interrupt Operation, INT Pin, and Interrupt
Reporting Mechanisms section. The format of this register is almost identical to the format of the low-limit register
(described in the Low-Limit Register) and the result register (described in the Result Register). To explain the
similarity in more detail, the high-limit register exponent (HE[3:0]) is similar to the low-limit register exponent
(LE[3:0]) and the result register exponent (E[3:0]). The high-limit register result (TH[11:0]) is similar to the low-
limit result (TH[11:0]) and the result register result (R[11:0]). Note that the comparison of the high-limit register
with the result register is unaffected by the ME bit.
When using a manually-set, full-scale range with the mask enable (ME) active, programming the manually-set,
full-scale range into the HE[3:0] bits can simplify the choice of values required to program into this register. The
formula to translate this register into lux is similar to Equation 4. The full-scale values are similar to Table 8.
Figure 26. High-Limit Register
15
14
13
12
11
10
9
8
HE3
R/W
HE2
R/W
HE1
R/W
HE0
R/W
TH11
R/W
TH10
R/W
TH9
R/W
TH8
R/W
7
6
5
4
3
2
1
0
TH7
R/W
TH6
R/W
TH5
R/W
TH4
R/W
TH3
R/W
TH2
R/W
TH1
R/W
TH0
R/W
LEGEND: R/W = Read/Write
Table 13. High-Limit Register Field Descriptions
Bit
Field
Type
Reset
Description
Exponent.
These bits are the exponent bits.
15:12
HE[3:0]
R/W
Bh
Result.
11:0
TH[11:0]
R/W
FFFh
These bits are the result in straight binary coding (zero to full-scale).
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7.6.1.1.5 Manufacturer ID Register (offset = 7Eh) [reset = 5449h]
This register is intended to help uniquely identify the device.
Figure 27. Manufacturer ID Register
15
ID15
R
14
ID14
R
13
ID13
R
12
ID12
R
11
ID11
R
10
ID10
R
9
ID9
R
8
ID8
R
7
ID7
R
6
ID6
R
5
ID5
R
4
ID4
R
3
ID3
R
2
ID2
R
1
ID1
R
0
ID0
R
LEGEND: R = Read only
Table 14. Manufacturer ID Register Field Descriptions
Bit
Field
Type
Reset
Description
Manufacturer ID.
15:0
ID[15:0]
R
5449h
The manufacturer ID reads 5449h. In ASCII code, this register reads TI.
7.6.1.1.6 Device ID Register (offset = 7Fh) [reset = 3001h]
This register is also intended to help uniquely identify the device.
Figure 28. Device ID Register
15
DID15
R
14
DID14
R
13
DID13
R
12
DID12
R
11
DID11
R
10
DID10
R
9
DID9
R
8
DID8
R
7
DID7
R
6
DID6
R
5
DID5
R
4
DID4
R
3
DID3
R
2
DID2
R
1
DID1
R
0
DID0
R
LEGEND: R = Read only
Table 15. Device ID Register Field Descriptions
Bit
Field
Type
Reset
Description
Device ID.
The device ID reads 3001h.
15:0
DID[15:0]
R
3001h
26
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8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
Ambient light sensors are used in a wide variety of applications that require control as a function of ambient light.
Because ambient light sensors nominally match the human eye spectral response, they are superior to
photodiodes when the goal is to create an experience for human beings. Very common applications include
display optical-intensity control and industrial or home lighting control.
There are two categories of interface to the OPT3006: electrical and optical.
8.1.1 Electrical Interface
The electrical interface is quite simple, as illustrated in Figure 29. Connect the OPT3006 I2C SDA and SCL pins
to the same pins of an applications processor, microcontroller, or other digital processor. If that digital processor
requires an interrupt resulting from an event of interest from the OPT3006, then connect the INT pin to either an
interrupt or general-purpose I/O pin of the processor. There are multiple uses for this interrupt, including signaling
the system to wake up from low-power mode, processing other tasks while waiting for an ambient light event of
interest, or alerting the processor that a sample is ready to be read. Connect pullup resistors between a power
supply appropriate for digital communication and the SDA and SCL pins (because they have open-drain output
structures). If the INT pin is used, connect a pullup resistor to the INT pin. A typical value for these pullup
resistors is 10 kΩ. The resistor choice can be optimized in conjunction to the bus capacitance to balance the
system speed, power, noise immunity, and other requirements.
The power supply and grounding considerations are discussed in the Power-Supply Recommendations section.
Although spike suppression is integrated in the SDA and SCL pin circuits, use proper layout practices to
minimize the amount of coupling into the communication lines. One possible introduction of noise occurs from
capacitively coupling signal edges between the two communication lines themselves. Another possible noise
introduction comes from other switching noise sources present in the system, especially for long communication
lines. In noisy environments, shield communication lines to reduce the possibility of unintended noise coupling
into the digital I/O lines that could be incorrectly interpreted.
8.1.2 Optical Interface
The optical interface is physically located on the same side of the device as the electrical interface, as shown in
the Sensing Area of the mechanical packages at the end of this data sheet. At a system level, this configuration
requires that the light that illuminates the sensor must come through the PCB or FPCB. Typically, the best
solution is to create a cutout area in the PCB. Other solutions are possible, but with associated design trade-offs.
This cutout must be carefully designed because the dimensions and tolerances impact the net-system, optical
field-of-view performance. The design of this cutout is discussed more in the Design Requirements section.
Physical components, such as a plastic housing and a window that allows light from outside of the design to
illuminate the sensor (see Figure 30), can help protect the OPT3006 and neighboring circuitry. Sometimes, a
dark or opaque window is used to further enhance the visual appeal of the design by hiding the sensor from
view. This window material is typically transparent plastic or glass.
Any physical component that affects the light that illuminates the sensing area of a light sensor also affects the
performance of that light sensor. Therefore, for optimal performance, make sure to understand and control the
effect of these components. Design a window width and height to permit light from a sufficient field of view to
illuminate the sensor. For best performance, use a field of view of at least ±35°, or ideally ±45° or more.
Understanding and designing the field of view is discussed further in application report SBEA002, OPT3001:
Ambient Light Sensor Application Guide.
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Application Information (continued)
The visible-spectrum transmission for dark windows typically ranges between 5% to 30%, but can be less than
1%. Specify a visible-spectrum transmission as low as, but no more than, necessary to achieve sufficient visual
appeal because decreased transmission decreases the available light for the sensor to measure. The windows
are made dark by either applying an ink to a transparent window material, or including a dye or other optical
substance within the window material itself. This attenuating transmission in the visible spectrum of the window
creates a ratio between the light on the outside of the design and the light that is measured by the OPT3006. To
accurately measure the light outside of the design, compensate the OPT3006 measurement for this ratio.
Ambient light sensors are used to help create ideal lighting experiences for humans; therefore, the matching of
the sensor spectral response to that of the human eye response is vital. Infrared light is not visible to the human
eye, and can interfere with the measurement of visible light when sensors lack infrared rejection. Therefore, the
ratio of visible light to interfering infrared light affects the accuracy of any practical system that represents the
human eye. The strong rejection of infrared light by the OPT3006 allows measurements consistent with human
perception under high-infrared lighting conditions, such as from incandescent, halogen, or sunlight sources.
Although the inks and dyes of dark windows serve their primary purpose of being minimally transmissive to
visible light, some inks and dyes can also be very transmissive to infrared light. The use of these inks and dyes
further decreases the ratio of visible to infrared light, and thus decreases sensor measurement accuracy.
However, because of the excellent infrared rejection of the OPT3006, this effect is minimized, and good results
are achieved under a dark window with similar spectral responses to those shown in Figure 32.
For best accuracy, avoid grill-like window structures, unless the designer understands the optical effects
sufficiently. These grill-like window structures create a nonuniform illumination pattern at the sensor that make
light measurement results vary with placement tolerances and angle of incidence of the light. If a grill-like
structure is desired, the OPT3006 is an excellent sensor choice because it is minimally sensitive to illumination
uniformity issues disrupting the measurement process.
Light pipes can appear attractive for aiding in the optomechanical design that brings light to the sensor; however,
do not use light pipes with any ambient light sensor unless the system designer fully understands the
ramifications of the optical physics of light pipes within the full context of his design and objectives.
8.2 Typical Application
Measuring the ambient light with the OPT3006 mounted on a flexible printed circuit board (FPCB) is described in
this section. The schematic for this design is shown in Figure 29.
VDD
VDD
OPT3006
Digital Processor
SCL
SDA
INT
SCL
SDA
Ambient
Light
I2C
Interface
Optical
Filter
ADC
INT or GPIO
ADDR
GND
Figure 29. Measuring Ambient Light on an FPCB
28
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Typical Application (continued)
8.2.1 Design Requirements
This design focuses on the field of view, or angular response, of an OPT3006 mounted on an FPCB with an area
cut out that permits light to illuminate the sensor. As a result of the geometry of this cutout, the system field of
view (angular response) depends on the axis of rotation. One axis of rotation has a less restricted field of view,
and the other axis of rotation has a more restricted field of view. The basic requirements of this design are:
•
•
Mount the OPT3006 onto an FPCB with a cutout that allows light to illuminate the sensor.
The field of view along the axis of rotation with the less restricted field of view must match the device
performance.
•
The field of view for the more restricted axis of rotation must be minimum of ±30°.
Field of view is traditionally defined as the angle at which the angular response is 50% of the maximum value of
the system response.
8.2.2 Detailed Design Procedure
8.2.2.1 Optomechanical Design
After completing the electrical design (see Figure 29), the next task is the optomechanical design of the FPCB
cutout. Design this cutout in conjunction with the tolerance capabilities of the FPCB manufacturer. Or,
conversely, choose the FPCB manufacturer for its capabilities of optimally creating this cutout. A semi-
rectangular shape of the cutout, created with a standard FPCB laser, is presented here. There are many
alternate approaches with different cost, tolerance, and performance tradeoffs.
An image of the created FPCB with the rectangular cutout is shown in Figure 30. The long (vertical) direction of
the cutout obviously has no effect on the angular response because any shadows created from the FPCB do not
come near the sensor. The long cutout direction defines the axis of rotation with the less restricted field of view.
The narrow (horizontal) direction of the cutout, which is limited by the electrical connections to OPT3006, can
create shadows that can have a minor impact on the angular response. The narrow cutout direction defines the
axis of rotation of the more restricted view. The possibility of shadows are illustrated in Figure 31, a cross-
sectional diagram showing the OPT3006 device, with the sensing area, soldered to the FPCB with the cutout.
Figure 30. Image of FPCB With OPT3006 Mounted, Receiving Light Through the Cutout
Device
Illuminated
Sensor
Shadowed
Sensor
Copper Pillar Electrical Connection
Solder
Sensing Area
Shadow
FPCB
FPCB
Shadow Limiting
Point
Light entering from
30 degree angle
Figure 31. Cross-Sectional Diagram of OPT3006 Soldered to an FPCB With a Cutout, Including Light
Entering From an Angle
Copyright © 2016, Texas Instruments Incorporated
29
OPT3006
ZHCSFL9 –OCTOBER 2016
www.ti.com.cn
Typical Application (continued)
To design the angular response to have greater than 50% response at 30°, the optical mechanisms must be
understood. This analysis is simplified by assuming a perfectly rectangular cutout. The concepts for this
rectangular cutout apply to nonrectangular cutouts, but require a more complex 3D analysis. The analysis
performed here is approximate because the actual cutout is not perfectly rectangular.
The net system response is the response of the device without the shadowing effect, multiplied by the
percentage of the device that is illuminated, per Equation 5:
Net System Response (%) = Device Response (%) × Device Illumination (%)
(5)
The shadow impacts the percentage of the sensor that can be illuminated, as seen in Figure 31. The percent
response of a shadowed sensor is the percent of the sensor that is illuminated.
The percent of the sensor that must be illuminated to achieve > 50% response is derived by the sequence of
Equation 6 through Equation 8.
Net System Response > 50%
(6)
(7)
(8)
Device Response × Device Illumination > 50%
Device Illumination > 50% / Device Response
The device has a 75% response at 30°, as shown in Figure 13, and is a little less than the expected cosine of
30°. The resulting device illumination is shown inEquation 9.
Device Illumination > 66%
(9)
Hence, the 3-dimensional geometry illustrated in Figure 31 must permit greater than 66% of the sensor to be
illuminated at a 30° angle of incident light. To quantify the geometry of this design, the post-SMT solder thickness
is approximately 37 µm (half the thickness of the pre-SMT solder paste thickness), the copper pillar electrical
connection is 7 µm, and the FPCB is 105 µm. Therefore, the shadow limiting point is 37 µm + 7 µm + 105 µm =
149 µm, higher than the sensing surface. The 30° angle shadow extends beyond that shadow limiting point per
Equation 10.
Shadow = Tan (Illumination_Angle) × Shadow_limiting_height = Tan (30degrees) × 149 µm = 86 µm
(10)
For this instance of the design and tolerance, the shadow limiting point of FPCB cutout is roughly even with the
sensor edge, so 86 µm of the sensor is under shadow. If the shadow limiting point was not even with the sensor
edge because of either the design or the tolerances, an extra term is added per the system geometry. Given that
the sensor width is 381 µm (per the attached mechanical drawing at the end of this data sheet), the amount of
illuminated sensor is 381 µm – 86 µm = 295 µm = 77.4%.
The net response at the 30° angle is predicted byEquation 11
Net System Response = Device Response × Device Illumination = 75% × 77.4% = 58%
(11)
There might be an additional need to put a product casing over the assembly of OPT3006 and the FPCB. The
window sizing and placement for such an assembly is discussed in more rigorous detail in application report
OPT3001: Ambient Light Sensor Application Guide (SBEA002).
30
Copyright © 2016, Texas Instruments Incorporated
OPT3006
www.ti.com.cn
ZHCSFL9 –OCTOBER 2016
Typical Application (continued)
8.2.3 Application Curves
To validate the angular response of the design, put a light source in a fixed position, allow the device assembly
to rotate, and take device measurements at a series of angles. The resulting angular response of this design
along the less-restricted rotational axis is shown in Figure 32. The resulting angular response of the more-
restricted rotational axis is shown in Figure 33. The response of the device at a 30° angle is approximately 60%,
and is very close to the 58% predicted by Equation 11 in the preceding analysis.
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-90 -75 -60 -45 -30 -15
0
15 30 45 60 75 90
-90 -75 -60 -45 -30 -15
0
15 30 45 60 75 90
Incidence Angle (Degrees)
Incidence Angle (Degrees)
D010
D022
Figure 32. Angular Response of this FPCB Design Along
the Less-Restricted Rotational Axis
Figure 33. Angular Response of this FPCB Design Along
the More-Restricted Rotational Axis
8.3 Do's and Don'ts
As with any optical product, take special care when handling the OPT3006. The OPT3006 is a piece of active
silicon, without the mechanical protection of an epoxy-like package or other reenforcement. This design allows
the device to be as thin as possible. Take extra care to handle the device gently in order to not crack or break
the device. Use a properly-sized vacuum manipulation tool to handle the device.
Although the OPT3006 has low sensitivity to dust and scratches, proper optical device handling procedures are
still required.
The optical surface of the device must be kept clean for optimal performance, both when prototyping with the
device, and during mass production manufacturing procedures. Keep the optical surface clean of fingerprints,
dust, and other optical-inhibiting contaminants.
If the optical surface of the device requires cleaning, use a few gentle brushes with a soft swab of deionized
water or isopropyl alcohol. Avoid potentially abrasive cleaning and manipulating tools and excessive force that
can scratch the optical surface.
If the OPT3006 performs less than optimally, inspect the optical surface for dirt, scratches, or other optical
artifacts.
9 Power-Supply Recommendations
Although the OPT3006 has low sensitivity to power-supply issues, good practices are always recommended. For
best performance, the OPT3006 VDD pin must have a stable, low-noise power supply with a 100-nF bypass
capacitor close to the device, and solid grounding. There are many options for powering the OPT3006 because
the device current consumption levels are very low.
Copyright © 2016, Texas Instruments Incorporated
31
OPT3006
ZHCSFL9 –OCTOBER 2016
www.ti.com.cn
10 Layout
10.1 Layout Guidelines
The PCB layout design for the OPT3006 requires a couple of considerations. The design of the cutout to allow
light to illuminate the sensor is a critical part of this design. See the Optomechanical Design section for a more
detailed discussion of creating this cutout.
The device layout is also critical for optimal SMT assembly. Two types of land pattern pads can be used for this
package: solder mask defined pads (SMD) and non-solder mask defined pads (NSMD). SMD pads have a solder
mask opening that is smaller than the metal pads, whereas NSMD has a solder mask opening that is larger than
the metal pad.Figure 34 illustrates these types of landing-pattern pads. SMD is preferred because it provides a
more accurate soldering-pad dimension with the trace connections. For further discussion of SMT and PCB
recommendations, see the Soldering and Handling Recommendations section.
Figure 34. Soldermask Defined Pad (SMD) and Non-Soldermask Defined Pad (NSMD)
Stabilize the power supply with a capacitor placed close to the OPT3006 VDD and GND pins. Note that optically
reflective surfaces of components also affect the performance of the design. The three-dimensional geometry of
all components and structures around the sensor must be taken into consideration to prevent unexpected results
from secondary optical reflections. Placing capacitors and components at a distance of at least twice the height
of the component is usually sufficient, although further placement can still achieve good results. The most
optimal optical layout is to place all close components on the opposite side of the PCB from the OPT3006.
However, this approach may not be practical for the constraints of every design.
An example PCB layout with the OPT3006 is shown in Figure 36.
10.2 Soldering and Handling Recommendations
The OPT3006 is a very small device with special soldering and handling considerations. See Optomechanical
Design for implications of alignment between the device and the cutout area. See Layout Guidelines for
considerations of the soldering pads.
As with most optical devices, handle the OPT3006 with special care to make sure optical surfaces stay clean and
free from damage. See the Do's and Don'ts section for more detailed recommendations. For best optical
performance, clean solder flux and any other possible debris after soldering processes.
32
Copyright © 2016, Texas Instruments Incorporated
OPT3006
www.ti.com.cn
ZHCSFL9 –OCTOBER 2016
Soldering and Handling Recommendations (continued)
10.2.1 Solder Paste
For solder-paste deposition, use a stencil-printing process that involves the transfer of solder paste through
predefined apertures with the application of pressure. Stencil parameters, such as aperture area ratio and
fabrication process, have a significant impact on paste deposition. Cut the stencil apertures using a laser with an
electropolish-fabrication method. Taper the stencil aperture walls by 5° to facilitate paste release. Shifting the
solder-paste towards the outside of the device minimizes the possibility of solder getting into the device sensing
area. See the mechanical packages attached to the end of this data sheet.
Use solder paste selection type 4 or higher, no-clean, lead-free solder paste. If solder splatters in the reflow
process, choose a solder paste with normal- or low-flux contents, or alter the reflow profile per the Reflow Profile
section.
10.2.2 Package Placement
Use a pick-and-place nozzle with a size number larger than 0.6 mm. If the placement method is done by
programming the component thickness, add 0.04 mm to the actual component thickness so that the package sits
halfway into the solder paste. If placement is by force, then choose minimum force no larger than 3N in order to
avoid forcing out solder paste, or free falling the package, and to avoid soldering problems such as bridging and
solder balling.
10.2.3 Reflow Profile
Use the profile in Figure 35, and adjust if necessary. Use a slow solder reflow ramp rate of 1°C to 1.2°C/s to
minimize chances of solder splattering onto the sensing area.
Figure 35. Recommended Solder Reflow Temperature Profile
Copyright © 2016, Texas Instruments Incorporated
33
OPT3006
ZHCSFL9 –OCTOBER 2016
www.ti.com.cn
Soldering and Handling Recommendations (continued)
10.2.4 Special Flexible Printed Circuit Board (FPCB) Recommendations
Special flexible printed circuit board (FPCB) design recommendations include:
•
•
Fabricate per IPC-6013.
Use material of flexible copper clad per IPC 4204/11 (Define polyimide and copper thickness per product
application).
•
•
•
Finish: All exposed copper will be electroless Ni immersion gold (ENIG) per IPC 4556.
Solder mask per IPC SM840.
Use a laser to create the cutout for light sensing for better accuracy, and to avoid affecting the soldering pad
dimension. Other options, such as punched cutouts, are possible. See the Optomechanical Design section for
further discussion ranging from the implications of the device to cutout region size and alignment. The full
design must be considered, including the tolerances.
To assist the handling of the very thin flexible circuit, design and fabricate a fixture to hold the flexible circuit
through the paste-printing, pick-and-place, and reflow processes. Contact the factory for examples of such
fixtures.
10.2.5 Rework Process
If the OPT3006 must be removed from a PCB, discard the device and do not reattach. To remove the package
from the PCB/Flexi cable, heat the solder joints above liquidus temperature. Bake the board at 125°C for 4 hours
prior to rework to remove moisture that may crack the PCB or causing delamination. Use a thermal heating
profile to remove a package that is close to the profile that mounts the package. Clean the site to remove any
excess solder and residue to prepare for installing a new package. Use a mini stencil (localized stencil) to apply
solder paste to the land pattern. In case a mini stencil cannot be used because of spacing or other reasons,
apply solder paste on the package pads directly, then mount, and reflow.
10.3 Layout Example
SCL
INT
GND
OPT3006
ADDR
Microcontoller
Capacitor
VDD
SDA
Cutout
Figure 36. Example FPCB Layout With the OPT3006
34
版权 © 2016, Texas Instruments Incorporated
OPT3006
www.ti.com.cn
ZHCSFL9 –OCTOBER 2016
11 器件和文档支持
11.1 文档支持
11.1.1 相关文档ꢀ
相关文档如下：
•
•
•
《OPT3001：环境光传感器应用指南》（文献编号：SBEA002）
《OPT3006EVM 用户指南》（文献编号：SBOU181）
应用报告《QFN/SON PCB 连接》（文献编号：SLUA271）
11.2 接收文档更新通知
如需接收文档更新通知，请访问 www.ti.com.cn 网站上的器件产品文件夹。点击右上角的提醒我 (Alert me) 注册
后，即可每周定期收到已更改的产品信息。有关更改的详细信息，请查阅已修订文档中包含的修订历史记录。
11.3 社区资源
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
11.4 商标
PicoStar, E2E are trademarks of Texas Instruments.
All other trademarks are the property of their respective owners.
11.5 静电放电警告
ESD 可能会损坏该集成电路。德州仪器 (TI) 建议通过适当的预防措施处理所有集成电路。如果不遵守正确的处理措施和安装程序 , 可
能会损坏集成电路。
ESD 的损坏小至导致微小的性能降级 , 大至整个器件故障。 精密的集成电路可能更容易受到损坏 , 这是因为非常细微的参数更改都可
能会导致器件与其发布的规格不相符。
11.6 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 机械、封装和可订购信息
以下页中包括机械、封装和可订购信息。这些信息是针对指定器件可提供的最新数据。这些数据会在无通知且不对
本文档进行修订的情况下发生改变。欲获得该数据表的浏览器版本，请查阅左侧的导航栏。
版权 © 2016, Texas Instruments Incorporated
35
PACKAGE OPTION ADDENDUM
www.ti.com
11-Jan-2022
PACKAGING INFORMATION
Orderable Device
Status Package Type Package Pins Package
Eco Plan
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
Samples
Drawing
Qty
(1)
(2)
(3)
(4/5)
(6)
OPT3006YMFR
OPT3006YMFT
ACTIVE
ACTIVE
PICOSTAR
PICOSTAR
YMF
YMF
6
6
3000 RoHS & Green
250 RoHS & Green
CUNIPD
Level-1-260C-UNLIM
Level-1-260C-UNLIM
-40 to 85
-40 to 85
6F
6F
CUNIPD
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two
lines if the finish value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
11-Jan-2022
Addendum-Page 2
PACKAGE OUTLINE
YMF0006A
PicoStar TM - 0.226 mm max height
S
C
A
L
E
1
5
.
0
0
0
PicoStar
0.886
0.826
A
B
PIN A1
CORNER
0.976
0.916
C
0.226 MAX
0.0087 TYP
SEATING PLANE
0.007
OPTICAL FILTER
(0.04) TYP
ALL AROUND
(0.381)
SENSING AREA PULL BACK
C
SENSING AREA
(0.378)
PKG
B
0.7
TYP
(0.298)
D: Max = 0.976 mm, Min =0.916 mm
0.35
TYP
E: Max = 0.886 mm, Min =0.826 mm
(0.005)
OPTICAL FILTER
OFFSET OF PKG CENTER
A
0.18
6X
1
2
0.12
(0.461)
0.6
0.015
C A B
4222902/A 05/2016
PicoStar is a trademark of Texas Instruments.
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
www.ti.com
EXAMPLE BOARD LAYOUT
YMF0006A
PicoStar TM - 0.226 mm max height
PicoStar
(0.3) TYP
(
0.15) TYP
SOLDER MASK
OPENING
1
2
A
(0.35) TYP
SYMM
B
C
(
0.25)
METAL UNDER
SOLDER MASK
PCB CUTOUT
SYMM
(REFER TO THE LAYOUT GUIDELINES
SECTION OF THE DATASHEET)
LAND PATTERN EXAMPLE
SCALE: 55X
4222902/A 05/2016
NOTES: (continued)
3. Final dimensions may vary due to manufacturing tolerance considerations and also routing constraints.
For more information, see Texas Instruments literature number SLUA271 (www.ti.com/lit/slua271).
www.ti.com
EXAMPLE STENCIL DESIGN
YMF0006A
PicoStar TM - 0.226 mm max height
PicoStar
(0.315)
TYP
(0.21)
TYP
2
1
A
B
(0.35)
TYP
SYMM
(R0.05)
TYP
C
6X ( 0.15)
SOLDER MASK
OPENING
6X METAL UNDER
SOLDER MASK
SYMM
SOLDER PASTE EXAMPLE
BASED on 0.075 mm THICK STENCIL
SCALE: 55X
4222902/A 05/2016
NOTES: (continued)
4. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release.
www.ti.com
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