ALS-PDIC17-79NB-TR8 [EVERLIGHT]

I2 Digital Ambient Light Sensor; I2数字环境光传感器
ALS-PDIC17-79NB-TR8
型号: ALS-PDIC17-79NB-TR8
厂家: EVERLIGHT ELECTRONICS CO., LTD    EVERLIGHT ELECTRONICS CO., LTD
描述:

I2 Digital Ambient Light Sensor
I2数字环境光传感器

传感器
文件: 总21页 (文件大小:549K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Features  
Close to the human eye's response  
15 bit effective resolution  
50Hz/60Hz rejection  
Low sensitivity variation across various light sources  
Operating temperature performance, -40oC to 85oC  
Wide supply voltage range, 2.7V to 5.5V  
• Low power consumption, less than 2mW while operating  
• Shut-down mode, current consumption less than 0.1uA  
• I2C serial port communication: (1) Standard 100kHz, (2).Fast 400kHz  
High dynamic sensing range and from 0 to 220000 Lux  
Size : 2.0mm(L)*2mm(W)*0.6mm(H)  
RoHS compliant and Pb Free package  
Description  
The ALS-PDIC17-79NB/TR8 is a digital-output light sensor with a two-wire, I2C serial interface that is  
compatible with SMBus when working at 100kHz serial clock frequency. It combines a photodiode and an  
analog-to-digital converter (ADC) on a single CMOS integrated circuit to provide light measurements over an  
effective 15-bit dynamic range. Two operation modes are provided with one for constantly refreshing ADC and  
the other for one time integration. When working in “one time integration” mode, no external resister is  
required. The integrating conversion technique used by ALS-PDIC17-79NB/TR8 effectively eliminates the  
effect of flicker from AC-powered lamps, increasing the stability of the measurement. ALS-PDIC17-79NB/TR8  
is very close to human-eye vision, having very low response to non-visible light, such as infrared and  
ultra-violet light.  
Applications  
• Detection of ambient light for controlling the backlighting of TFT LCD display  
• Automatic residential and commercial lighting management  
• Automatic contrast enhancement for electronic signboard  
• Ambient light monitoring device for daylight and artificial light  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
1
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Package Dimensions  
Note: 1. All Units are mm.  
2. Unspecified tolerance is ±0.10mm  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
2
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Absolute Maximum Ratings (Ta=25)  
Parameter  
Storage temperature  
Symbol  
TSTG  
TOPR  
VDD  
Vo  
Min.  
-40  
-40  
-0.3  
-0.3  
-10  
2
Max.  
100  
85  
Units  
°C  
Operating temperature  
Supply voltage  
°C  
6.0  
6.0  
+10  
-
V
Digital output voltage  
Digital output current  
V
Io  
mA  
KV  
ESD tolerance, human body model  
-
Block Diagram & Pad Descriptions  
Figure 1. ALS-PDIC17-79NB/TR8 Functional Block Diagram  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
3
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Electrical and Optical Characteristics (Ta=25, VDD=3.3V)  
Parameter  
Symbol  
Test Conditions  
Min.  
Typ.  
0.4  
Max.  
0.5  
Units  
mA  
IDD  
Active mode  
Power-down mode  
Io = 4mA  
-
-
-
-
-
Supply current  
IDDQ  
VOL  
-
-
-
-
0.1  
uA  
I2C output low voltage  
Detection limit  
0.4  
V
Full scale  
32,767  
110,000  
count  
lux  
Tint = 100mS  
Peak sensitivity wavelength  
λp  
-
-
-
550  
-
-
nm  
Response in dark  
environment  
Ev = 0 lux,  
Rdak  
Ricd  
Rfrst  
1
-
count  
counts  
count  
Tint = 100 mS  
Ev = 100 lux  
Tint = 100 mS  
Ev = 100 lux  
Tint = 100 mS  
Response to incandescent  
lamp  
23  
20  
32  
30  
Response to fluorescent  
lamp  
-
DC Characteristics of I2C Signals in Standard and Fast Mode  
Standard Mode  
Fast Mode  
Min. max.  
2.7 5.5  
Symbol  
Parameter  
Unit  
Min.  
Max.  
Power supply voltage (recommend)  
Low level input voltage  
VDD  
VIL  
VIH  
2.7  
5.5  
V
V
V
-0.5  
2.0  
1.0  
-0.5  
2.0  
1.0  
High level input voltage  
Hysteresis of Schmit trigger inputs  
(VDD > 2V)  
Vhys  
0.05VDD  
0
-
0.05VDD  
0
-
V
V
Low level output voltage (open drain)  
at 3mA sink current (VDD > 2V)  
Output fall time from VIHMIN to VILMAX  
with a bus capacitance from 10pF to  
400pF  
VOL1  
0.4  
0.4  
20+0.1Cb  
tof  
-
250[2]  
250 [2]  
nS  
[1]  
Input current of each IO pins with an  
input voltage between 0.1VDD and  
0.9VDD  
Ii  
-10  
-
10  
10  
-10  
-
10  
10  
uA  
pF  
Capacitance for each IO pin  
Notes:  
Ci  
1.  
2.  
Cb = capacitance of one bus line in pF  
The maximum tf for the I2C data and clock bus lines quoted in the AC table is longer than the  
specified maximum tof for the output stages (250nS). This allows series protection resistors (Rs) to  
be connected between I2C data / clock pins and the I2C data / clock bus lines without exceeding the  
maximum specified tf.  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
4
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
AC Characteristics of I2C Signals in Standard and Fast Mode  
Standard Mode  
Fast Mode  
Min. max.  
Parameter  
I2C clock frequency  
Symbol  
Unit  
Min.  
Max.  
fSCL  
0
100  
0
400  
KHz  
Hold time (repeated) START condition.  
After this period, the first clock pulse is  
generated.  
tHD;STA  
4.0  
0.6  
-
uS  
Low period of I2C clock  
tLOW  
tHIGH  
4.7  
4.0  
1.3  
0.6  
uS  
uS  
High period of I2C clock  
Set-up time for a repeated START  
condition  
tSU;STA  
4.7  
0.6  
uS  
Data hold time for I2C-bus devices  
Data set-up time  
tHD;DAT  
tSU;DAT  
0
3.45  
-
0
0.9  
-
uS  
nS  
250  
100  
Rise time of both I2C data and clock  
signalss  
Fall time of both I2C data and clock  
signals  
tr  
-
1000  
5
300  
nS  
tf  
-
300  
0.1  
300  
nS  
uS  
uS  
pF  
V
Set-up time for STOP condition  
Bus free time between STOP and START  
condition  
tSU;STO  
tBUF  
Cb  
4.0  
-
0.6  
-
4.7  
-
1.3  
-
Capacitive load for each bus line  
Noise margin at the low level for each  
connected device (including hysteresis)  
Noise margin at the high level for each  
connected device (including hysteresis)  
-
400  
-
-
400  
-
VnL  
0.1VDD  
0.1VDD  
VnH  
0.2VDD  
-
0.2VDD  
-
V
Figure 2. I2C Timing Diagram  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
5
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Typical Electrical and Optical Characteristics Curves  
Fig.3 Output code vs. Illuminance  
Fig.4 Output code vs. Supply voltage  
6
4
2
0
1800  
Fluorescent light  
Incandescent light  
1600  
Ev = 0 Lux  
Tint = 100 ms  
1400  
1200  
1000  
800  
600  
400  
200  
0
Vcc = 3.3 V  
Tint = 100 ms  
2.0  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
0
1000  
2000  
3000  
4000  
5000  
Supply voltage (V)  
Illuminance (Lux)  
Fig.5 Output code vs. Supply voltage  
Fig.6 Supply current vs. Supply voltage  
40  
380  
Ev = 100 Lux  
Tint = 100 ms  
Ev = 100 Lux  
Tint = 100 ms  
360  
30  
20  
10  
0
340  
320  
300  
280  
260  
2.0  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
2.0  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
Supply voltage (V)  
Supply voltage (V)  
Fig.7 Supply current vs. Temperature  
Fig.8 Output code vs. Temperature  
380  
10  
VDD = 3.3 V  
Tint = 100 ms  
Ev = 100 Lux  
VDD = 3.3 V  
Ev = 0 Lux  
360  
8
Tint = 100 ms  
340  
6
4
2
0
320  
300  
280  
260  
-60  
-40  
-20  
0
20  
40  
60  
80  
100  
-60  
-40  
-20  
0
20  
40  
60  
80  
100  
Temperature ()  
Temperature ()  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
6
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Fig.9 Output code vs. Temperature  
Fig.10 Spectral response  
50  
VDD = 3.3 V  
40  
30  
20  
10  
0
Ev = 100 Lux  
Tint = 100 ms  
-60  
-40  
-20  
0
20  
40  
60  
80  
100  
Temperature ()  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
7
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Communication Protocol  
ALS-PDIC17-79NB contains an 8-bit command register that can be written and read via the I2C bus.  
The command register controls the overall operation of the device. There is a two-byte word read-only register  
that contains the latest converted value of A/D converter. The I2C slave address is hardwired internally as  
0111001 (0x39, MSB to LSB, A6 to A0). All the Send Byte protocol, the Receive Byte protocol and Receive  
Word protocol are implemented in ALS-PDIC17-79NB.  
The Send Byte protocol allows single bytes of data to be written to the device (see Figure 11-a). The  
written byte is called the COMMAND byte. The Receive Byte protocol allows one-byte data to be read from the  
device (see Figure 11-b). Two-byte data can be read by following the Receive Word Protocol shown in Figure  
11-c. In Figure 11, the clear area represents data sent by the host (master) and the shaded area represents  
data returned by the ambient light sensor (slave device).  
1
S
7
1
WR  
0
1
A
0
8
1
A
0
1
P
Slave Address  
Command Byte  
(a) send byte protocol  
1
S
7
1
RD  
1
1
A
0
8
Data  
1
NA  
1
1
P
Slave Address  
(b) Receive byte protocol  
1
7
1
1
A
0
8
1
8
1
NA  
1
1
S
Slave Address  
RD  
1
LS byte of ADC  
A
0
MS byte of ADC  
P
(c) Receive word (two bytes) protocol  
S = start condition  
A = acknowledge  
P = stop condition  
Shaded = slave transmission  
WR = write RD= read  
NA = not acknowledge  
Figure 11. Communication Protocol  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
8
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Communication Format  
ALS-PDIC17-79NB is capable of working as an I2C slave. Address of this device on I2C bus is always  
0x39 (hexadecimal number 39). Registers of the slave device can be programmed by sending commands  
over I2C bus.  
Figure 12 shows an I2C write operation. To write to an internal register of the slave device a command  
must be sent by an I2C master. As illustrated in Figure 12, the I2C write command begins with a start condition.  
After the start condition, seven bits of address are sent with MSB going first. RD / WRn (=Low) command bit  
follows the address bits. Upon receiving a valid address the slave device responds by driving SDA low for an  
ACK. After receiving an ACK, I2C master sends eight bits of data with MSB first. Upon receiving eight bits of  
data the slave device generates an ACK. I2C master terminates this write command with a stop condition.  
START  
A
A
STOP  
R/W  
Device Address 0x39 (Hex)  
Command to Device  
SDA  
(Master OUT)  
A6 A5 A4 A3 A2 A1 A0  
R7 R6 R5 R4 R3 R2 R1 R0  
A
9
W
SDA  
(SlaveOUT)  
A
SDAdriven byMaster  
SDAdriven byMaster  
SCL  
(Master OUT)  
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
Figure 12. I2C Timing Diagram for Send Byte Format  
Figure 13 shows an I2C read command sent by the master to the slave device. I2C read command  
begins with a start condition. After the start condition seven bits of address are sent by the master with MSB  
going first. After the address bits, RD / WRn command bit is sent. For a read command the RD / WRn bits is  
high. Upon receiving the address bits and RD / WRn command bits the slave device responds with an ACK.  
After sending an ACK, the slave device sends eight bits of data with MSB going first. After receiving the one  
byte data, the I2C master terminates this transaction by issuing a NACK command to indicate that the master  
only wanted to read one byte from the device. The master generates a stop condition to end this transaction.  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
9
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
START  
A
A
STOP  
R/W  
Device Address 0x39 (Hex)  
Data to Master  
SDA  
(Master OUT)  
A6 A5 A4 A3 A2 A1 A0  
R
SDAdriven bySlave  
NA  
SDA  
(SlaveOUT)  
A
SDAdriven byMaster  
D7 D6 D5 D4 D3 D2 D1 D0  
SCL  
(Master OUT)  
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
Figure 13 I2C Timing Diagram for Receive Byte Format  
Ambient light intensity count value can be obtained by reading registers of this device. Ambient light  
intensity count is a 15-bit wide number plus a valid bit and hence word (two bytes) read operation is needed,  
as shown in Figure 14. After receiving the two byte data, the I2C master terminates this transaction by issuing  
a NACK command to indicate that the master only wanted to read two bytes from the device. The master  
generates a stop condition to end this transaction.  
START  
A
A
A
STOP  
R/W  
R
Device Address 0x39 (Hex)  
LS byte of ADC register  
SDAdriven bySlave  
MSbyteof ADC Register  
SDAdriven bySlave  
SDA  
A6 A5 A4 A3 A2 A1 A0  
A
NA  
(Master OUT)  
SDA  
(SlaveOUT)  
A
SDA driven byMaster  
D7 D6 D5 D4 D3 D2 D1 D0  
D7 D6 D5 D4 D3 D2 D1 D0  
SCL  
(Master OUT)  
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
Figure 14. I2C Timing Diagram for Receive Word Format  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
10  
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Theory of Operation  
The photocurrent, generated by the built-in photodiode while being illuminated, is proportionally  
converted to frequency; the digital frequency signal is then integrated by a 15-bit counter for a predetermined  
period of time (tint). This period of time is called integration time which can be adjusted by changing the  
nominal value of the resistor between the RINT and GND terminals. The converted data are read out through  
a two-wire, I2C Interface bus. Since the photodiode has been specially processed to suppress the spectral  
response in infrared region, the readout is very close to the photopic transfer function, v(λ), which is the  
mathematic expression of human-eye's response to ambient light.  
Address Option for I2C  
The I2C address is determined before placing an order; users can assign any one of the three  
addresses (0x39, 0x29, 0x40) for their specific application. Without any prior request for a specific I2C address,  
the default address is 0x39.  
Table 1. Conncecting options of I2C address  
Address Pin  
I2C Address  
Configuration  
Floating  
0x39 (default)  
0x29  
Tied to GND  
Tied to VCC  
0x44  
ADC Register  
The ADC register contains 16 bits with a 15-bit wide data from D0 to D14 and a valid bit D15. The  
register is divided into two groups; D[15..8] is the most significant (MS) byte and D[7..0] is the least significant  
(LS) byte. See Table 2 for details.  
Table 2. ADC Register Structure  
Valid Bit  
Data Bits  
D7~D1  
D15  
D14  
D13 ~ D8  
D0  
MSB  
LSB  
Most Significant (MS) byte  
Least Significant (LS) byte  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
11  
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Device Command  
There are eight command codes are provided for I2C master to control the ambient light sensor. The  
specific function corresponding to each command code is elaborate in Table 3.  
Table 3. Command Code List  
Command  
Function  
Code  
Shut-down mode, this is the default state after applying VDD power to the device.  
During shut-down mode, users can do the communication test. Except the MSB  
must be logic 1, the value written to the command register will not change any  
function and can be read back via the I2C bus by issuing Receive Byte Protocol.  
Activate the ambient light sensor and put the device in [continuous operation  
mode], The ADC register will be refreshed every tint integration time which is set  
by an external resistor Rext. See Table 4 for details.  
1xxx_xxxx  
(binary code)  
0x0C  
0x04  
0x08  
Activate the ambient light sensor and put the device in [one time integration  
mode]. The integration time is controlled by I2C commands, start and stop  
integration.  
Start integration: This command will reset the ADC register to 0x0000 and begin a  
new integration in [one time integration mode]. This is an invalid command in  
[continuous operation mode].  
Stop integration: This command will stop the integration in [one time integration  
mode] and set the valid bit ( D[15] ) high. This is an invalid command in  
[continuous operation mode].  
0x30  
0x34  
Reserved for future expansion.  
Programming Sequence  
Case 1: Using internal integration timing  
(1). After being powered on, the device will initially be in the shut-down mode (default  
setting).  
(2). To operate the device, issue an Send Byte protocol (see Figure 11-a) with the device  
address 0x39  
followed by a command byte of 0x0C to activate the ambient light sensor and put the device into  
"continuous operation mode".  
(3). To read the ADC conversion result, issue an Receive Word protocol (see Figure 11-c) with the  
device address 0x39 followed by two-byte reading procedures.  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
12  
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
(4). If a conversion has not been completed since being activated, the valid bit ( D[15] ) will be 0 to  
indicate that the data is not valid. If there is a valid conversion result available, the valid bit ( D[15] )  
will be set logic high, and the remaining 15 bits will represent valid data from the ADC register.  
(5). Data may be read repeatedly from the ADC register, and although it will remain valid, the ADC  
register will not be updated until a new conversion completes.  
Case 2: Using external integration timing  
(1). After being powered on, the device will initially be in the shut-down mode (default setting).  
(2). To operate the device, issue an Send Byte protocol (see Figure 11-a) with the device address 0x39  
followed by a command byte of 0x04 to activate the ambient light sensor and put the device into "one  
time integration mode".  
(3). I2C master sends a "start integration command" to the salve device by issuing Send Byte protocol  
with the device address 0x39 followed by a command byte of 0x08.  
(4). After a period of user defined integration time, I2C master sends a "stop integration command" to the  
salve device by issuing Send Byte protocol with the device address 0x39 followed by a command  
byte of 0x30.  
(5). To read the ADC conversion result, issue an Receive Word protocol (see Figure 11-c) with the device  
address 0x39 followed by two-byte reading procedures.  
(6). If the stop integration command is not received by the device, the valid bit ( D[15] ) will be 0 to  
indicate that the data is not valid. If there is a valid conversion result available, the valid bit ( D[15] )  
will be set logic high, and the remaining 15 bits will represent valid data from the ADC register.  
(7). Data may be read repeatedly from the ADC register, and although it will remain valid, the ADC  
register will not be updated until a new complete integration cycle has been carried out.  
In both cases, the power consumption of the device can be reduced by issue an Send Byte protocol  
with the device address 0x39 followed by a data byte of 0x8C.  
Noise Rejection and Integration Time  
In general, integrating type ADC’s have an excellent noise rejection characteristics for periodic noise  
sources whose frequency is an integer multiple of the integration time. For instance, a 60Hz AC unwanted  
signal’s sum from 0ms to n*16.66ms (n = 1,2...ni) is zero.  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
13  
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Similarly, setting the ALS-PDIC17-79NB integration time to an integer multiple of periodic noise signal  
greatly improves the light sensor output signal in the presence of noise. The integration time, tint, of the  
ALS-PDIC17-79NB is set by an external resistor Rext. The maximum detection range is inversely proportional  
to the integration time; that means the longer integration time the lower detection range.  
Table 4. Rext Resistor Selection Guide  
Rext  
(K)  
Detection range  
( lux )  
Resolution  
Integration time ( mS )  
( lux / count )  
50  
50  
220,000  
110,000  
6.71  
3.36  
(min.)  
100  
100  
(recommended)  
200  
200  
300  
55,000  
36,600  
1.68  
1.12  
300  
400  
400  
27,500  
0.84  
(max.)  
In order to achieve both 60Hz and 50Hz AC rejection, the integration time needs to be adjusted to  
coincide with an integer multiple of the AC noise cycle times. To determine a suitable integration time, tint, that  
will ignore the presence of both 60Hz and 50Hz noise, users can use the formula:  
tint = n(1/60Hz) = m(1/50Hz), where n and m are integers.  
n/m = 60Hz/50Hz = 6/5.  
The first instance of integer values at which tint rejects both 60Hz and 50Hz is when m = 5,  
and n = 6, thus,  
tint = 6(1/60Hz) = 5(1/50Hz) = 100ms,  
Rext = tint * (100k/100ms) = 100k, (see Table 4)  
By populating Rext = 100k, ALS-PDIC17-79NB defaults to 100ms integration time in continuous  
operation mode, and will reject the presence of both 60Hz and 50Hz power line signals. When working in  
one-time integration mode, the master must control the integration time to be an integer multiple of 100mS.  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
14  
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Power Supply Decoupling and Layout  
The power supply lines must be decoupled with capacitors, 4.7uF and 0.1uF, placed as close to the  
device package as possible. The bypass capacitor should have low effective series resistance (ESR) and  
effective series inductance (ESI), such as the common ceramic types, which provide a low impedance path to  
ground at high frequencies to handle transient currents caused by internal logic switching. ALS-PDIC17-79NB  
is relatively insensitive to layout. Like other I2C devices, it is intended to provide excellent performance even in  
significantly noisy environments. There are only a few considerations that will ensure best performance. Route  
the supply and I2C traces as far as possible from all sources of noise. Use two power-supply decoupling  
capacitors, 4.7µF and 0.1µF, placed close to the device.  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
15  
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Optical window dimensions  
In order to prevent ALS performance being affected by improper window design, some constrains on  
the dimensions and design of the window is as an example shown below,  
D1  
D2 =  
X =  
× 2  
× 2  
θ
2
tan( 90 ° − )  
( D 3 + D 1 )  
θ
2
tan( 90 ° − )  
θ: View Angle  
D1 : Distance between ALS and Windows  
D2 : Window’s Size  
D3 : Distance between light source and window  
X : Detection Width  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
16  
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Recommended method of storage  
1. Do not open moisture proof bag before devices are ready to use.  
2. Shelf life in sealed bag from the bag seal date:  
18 months at 10°C~30°C and < 90% RH.  
3. After opening the package, the devices must be stored at 10°C~30°C and 60%RH, and  
used within 168 hours (floor life).  
4. If the moisture absorbent material (desiccant material) has faded or unopened bag has  
exceeded the shelf life or devices (out of bag) have exceeded the floor life, baking  
treatment is required.  
5. If baking is required, refer to IPC/JEDEC J-STD-033 for bake procedure or recommend  
the following conditions:  
192 hours at 40°C +5/–0°C and < 5 % RH (reeled/tubed/loose units) or  
96 hours at 60°C ± 5°C and < 5 % RH (reeled/tubed/loose units) or  
24 hours at 125°C ± 5°C, not suitable for reel or tubes.  
Recommended Solder Profile  
Notice:  
(1) Reflow soldering should not be done more than two times.  
(2) When soldering, do not put stress on the devices during heating.  
(3) After soldering, do not warp the circuit board.  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
17  
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Soldering Iron  
Each terminal is to go to the tip of soldering iron temperature less than 350for 3 seconds within  
once in less than the soldering iron capacity 25W. Leave two seconds and more intervals, and do  
soldering of each terminal. Be careful because the damage of the product is often started at the time of  
the hand solder.  
Repairing  
Repair should not be done after the device have been soldered. When repairing is unavoidable, a  
double-head soldering iron should be used (as below figure). It should be confirmed beforehand whether  
the characteristics of the device will or will not be damaged by repairing.  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
18  
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Packing Quantity Specification  
2000 PCS/ 1 Reel  
Label Format  
Reel Dimensions  
Unit: mm  
Tolerance: ±0.1mm  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
19  
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Tape Dimensions  
Unit: mm  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
20  
Surface - Mount  
I2C Digital Ambient Light Sensor  
ALS-PDIC17-79NB/TR8  
Note:  
1. Above specification may be changed without notice. EVERLIGHT will reserve authority on material  
change for above specification.  
2. When using this product, please observe the absolute maximum ratings and the instructions for using  
outlined in these specification sheets. EVERLIGHT assumes no responsibility for any damage  
resulting from use of the product which does not comply with the absolute maximum ratings and the  
instructions included in these specification sheets.  
3. These specification sheets include materials protected under copyright of EVERLIGHT corporation.  
Please don’t reproduce or cause anyone to reproduce them without EVERLIGHT’s consent.  
Everlight Electronics Co., Ltd.  
Document No: DLS-xxxxxxx Rev1  
http://www.everlight.com  
Oct. 12, 2010  
21  

相关型号:

ALS-PDIC243-3B

Ambient Light Sensor
EVERLIGHT

ALS-PDIC243-3C

Linear IC Output Optocoupler
EVERLIGHT

ALS-PDT144-6C-L451

3mm T-1 Ambient Light Sensor
EVERLIGHT

ALS-PDT144-6C/L451

Photo Transistor
EVERLIGHT

ALS-PDT243-3C-L451

5mm T-1 3/4 Ambient Light Sensor
EVERLIGHT

ALS-PDT243-3C/L451

Photo Transistor,
EVERLIGHT

ALS-PT144-6C

Analog Circuit, 1 Func, ROHS COMPLIANT PACKAGE-2
EVERLIGHT

ALS-PT19-315C

Surface - Mount Ambient Light Sensor
EVERLIGHT

ALS-PT19-315C-L177-TR8

Surface - Mount Ambient Light Sensor
EVERLIGHT

ALS-PT19-315C/L177/TR8

Surface - Mount Ambient Light Sensor
EVERLIGHT

ALS-PT204-6C

3mm DIP Ambient Light Sensor
EVERLIGHT

ALS-PT204-6C-L177

3mm DIP Ambient Light Sensor
EVERLIGHT