MAX6677AUT3+T [MAXIM]
Analog Voltage Output Sensor, 0.3V Min, 3.2V Max, 3Cel, Rectangular, Surface Mount, PLASTIC, SOT-23, 6 PIN;
| 型号： | MAX6677AUT3+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Analog Voltage Output Sensor, 0.3V Min, 3.2V Max, 3Cel, Rectangular, Surface Mount, PLASTIC, SOT-23, 6 PIN 输出元件 传感器 换能器 |
| 文件： | 总7页 (文件大小：1181K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVALUATION KIT AVAILABLE
MAX6676/MAX6677
Low-Voltage, 1.8kHz PWM
Output Temperature Sensors
General Description
Features
● Simple Single-Wire, 1.8kHz PWM Output
The MAX6676/MAX6677 are high-accuracy, low-pow-
er temperature sensors with a single-wire output. The
MAX6676/MAX6677 convert the ambient temperature
into a ratiometric PWM output with temperature infor-
mation contained in the duty cycle of the output square
wave. The MAX6676 has an open-drain output and the
MAX6677 has a push-pull output.
● Operates Down to 1.8V
● High Accuracy
±1.5°C at T = +25°C
±3.0°C at T = 0°C to +85°C
A
A
● Operates from -40°C to +125°C
● Low 80µA Typical Current Consumption
● Small 6-Pin SOT23 Package
The MAX6676/MAX6677 are specified for operation with
power-supply voltages from 1.8V to 3.6V, or from 3.6V
to 5.5V (MAX6676 only). The typical unloaded supply
current is 80µA. All devices feature a single-wire output
that minimizes the number of pins necessary to interface
with a microprocessor (µP). The output is a square wave
with a nominal frequency of 1.8kHz (±20%) at +25°C. The
output format is decoded as follows:
Ordering Information
PART
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
6 SOT23
MAX6676AUT3-T
MAX6676AUT5-T
MAX6677AUT3-T
Temperature (°C) = 398.15 5 (t /t ) - 273.15
1 2
6 SOT23
Where t1 is fixed with a typical value of 0.24ms and t2 is
modulated by the temperature. The MAX6676/MAX6677
operate from -40°C to +125°C and are available in
space-saving 6-pin SOT23 packages.
6 SOT23
Selector Guide
Applications
SUPPLY
VOLTAGE
OUTPUT
TYPE
TOP
● Process Control
● Industrial
● HVAC and Environmental Control
● Portable Devices
● µP and µC Temperature Monitoring
● Isolated Temperature Sensing
PART
MARK
RANGE (V)
1.8 to 3.6
3.6 to 5.5
1.8 to 3.6
MAX6676AUT3
MAX6676AUT5
MAX6677AUT3
Open drain
Open drain
Push-pull
ABBF
ABBG
ABBH
Typical Operating Circuit
Pin Configuration
V
CC
TOP VIEW
V
CC
5.1kΩ*
INPUT TO
TIMER/
COUNTER
DOUT
1
2
3
6
5
4
GND
GND
GND
DOUT
MAX6676
MAX6677
MAX6676
t
0.1µF
2
µC
GND
t
1
V
GND
CC
SOT23
*REQUIRED ONLY FOR MAX6676.
19-2660; Rev 2; 4/15
MAX6676/MAX6677
Low-Voltage, 1.8kHz PWM
Output Temperature Sensors
Absolute Maximum Ratings
(Voltages Referenced to GND)
Continuous Power Dissipation (T = +70°C)
A
V
.......................................................................-0.3V to +6.0V
6-Pin SOT23 (derate 8.7mW/°C above +70°C) .......695.7mW
CC
DOUT (MAX6676)................................................-0.3V to +6.0V
DOUT (MAX6677).................................... -0.3V to (V + 0.3V)
DOUT Current .................................................... -1mA to +50mA
ESD Protection (DOUT, Human Body Model).................±2000V
Operating Temperature Range......................... -40°C to +125°C
Storage Temperature Range............................ -65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
CC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
CC
(V
= 1.8V to 3.6V (MAX6676AUT3/MAX6677AUT3), V
= 3.6V to 5.5V (MAX6676AUT5), T = -40°C to +125°C, unless otherwise
CC A
noted. Typical values are at V
= 3.0V (MAX6676AUT3/MAX6677AUT3), V
= 5.0V (MAX6676AUT5), T = +25°C.)
CC
CC A
PARAMETER
SYMBOL
CONDITIONS
MIN
1.8
TYP
MAX
3.6
UNITS
V
MAX6676AUT3/MAX6677AUT3
MAX6676AUT5
Supply Voltage Range
Supply Current
V
CC
3.6
5.5
I
R = ∞
80
200
+1.5
+3.0
+4.2
+5.5
µA
CC
L
T
= +25°C
-1.5
-3.0
-4.2
-5.5
A
T = 0°C to +85°C
A
Temperature Error
°C
T = -20°C to +100°C
A
T
= -40°C to +125°C
A
Nominal t Pulse Width
1
240
0.1
µs
V
V
CC
0.3
-
Output High Voltage
V
I
= 800µA, MAX6677
OH
OH
Output Leakage Current
Output Low Voltage
Fall Time
V
= V
µA
V
OUT
CC
V
I
= 3mA
0.3
OL
OL
t
C = 100pF, R = 10kΩ
20
300
30
ns
F
L
L
MAX6676, C = 15pF, R = 10kW
L
L
Rise Time
t
ns
R
MAX6677, C = 100pF, R = 10kW
L
L
Digital Output Capacitance
C
15
pF
OUT
Power-Supply Rejection Ratio
PSRR
V
= 1.8V - 3.6V
-1.2
+0.4
+1.2
°C/V
CC
Note 1: Parts are tested at +25°C. Specifications are guaranteed by design over temperature.
Maxim Integrated
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MAX6676/MAX6677
Low-Voltage, 1.8kHz PWM
Output Temperature Sensors
Typical Operating Characteristics
(V
= 3.0V, T = +25°C, unless otherwise noted.)
A
CC
t AND t TIMES
vs. TEMPERATURE
OUTPUT FREQUENCY
vs. TEMPERATURE
MAX6676AUT3 OUTPUT FREQUENCY
vs. SUPPLY VOLTAGE
1
2
2.50
3.0
2.5
2.0
1.5
1.0
450
400
350
300
250
200
t
2
2.25
2.00
1.75
1.50
TEMP = +125°C
TEMP = +25°C
TEMP = -40°C
t
1
1.8
2.1
2.4
2.7
3.0
3.3
3.6
-40 -15
10
35
60
85 110
-40 -15
10
35
60
85
110
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT ACCURACY
vs. TEMPERATURE
MAX6676AUT3 SUPPLY CURRENT
vs. TEMPERATURE
MAX6676AUT3 SUPPLY CURRENT
vs. SUPPLY VOLTAGE
5
600
500
400
300
200
100
0
450
400
350
300
250
200
150
100
50
3
1
V
V
= 3.6V
CC
5.1kΩ PULLUP
= 3.0V
= 1.8V
CC
-1
V
CC
-3
-5
NO PULLUP
5.1kΩ PULLUP RESISTOR
0
-40 -15
10
35
60
85 110
1.8
2.1
2.4
2.7
3.0
3.3
3.6
110
-40 -15
10
35
60
85
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
POWER-SUPPLY REJECTION RATIO
vs. TEMPERATURE
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
OUTPUT FALL TIME
(C = 100pF, R = 100kΩ)
L
L
1.0
0.5
0
2
1
0
-1
-2
-3
-4
-5
-6
1V/div
0V
-0.5
-1.0
V
= 100mV
10
AC
P-P
1k
-50 -25
0
25
50
75 100 125
1
100
FREQUENCY (Hz)
10k
10ns/div
TEMPERATURE (°C)
Maxim Integrated
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MAX6676/MAX6677
Low-Voltage, 1.8kHz PWM
Output Temperature Sensors
Typical Operating Characteristics (continued)
(V
= 3.0V, T = +25°C, unless otherwise noted.)
A
CC
MAX6677 OUTPUT RISE AND FALL TIMES
vs. CAPACITIVE LOAD
MAX6677 OUTPUT RISE TIME
MAX6676 toc10
200
C
= 100pF
LOAD
R = 100kΩ
L
160
120
1V/div
RISE
80
0
40
FALL
0
100
300
500
0
200
400
600
40ns/div
C
LOAD
(pF)
MAX6677 OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
MAX6677 OUTPUT LOW VOLTAGE
vs. TEMPERATURE
3.50
3.25
3.00
2.75
2.50
350
300
250
200
150
100
50
I
= 800µA
SOURCE
I
= 5mA
SINK
I
= 1.5mA
SINK
I
= 1mA
100
SINK
0
-40 -15
10
35
60
85
110
-40
-5
30
TEMPERATURE (°C)
65
TEMPERATURE (°C)
Maxim Integrated
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MAX6676/MAX6677
Low-Voltage, 1.8kHz PWM
Output Temperature Sensors
Pin Description
Applications Information
Accurate temperature monitoring requires a good
thermal contact between the MAX6676/MAX6677
and the object being monitored. A precise tempera-
ture measurement depends on the thermal resistance
between the object being monitored and the MAX6676/
MAX6677 die. Heat flows in and out of plastic packages
primarily through the leads. If the sensor is intended to
measure the temperature of a heat-generating compo-
nent on the circuit board, mount the device as close as
possible to that component and share the ground traces
(if they are not too noisy) with the component. This maxi-
mizes the heat transfer from the component to the sensor.
PIN
NAME
FUNCTION
Digital Output Pin. The duty
cycle of the output waveform is
modulated by temperature
1
DOUT
Ground. All four ground pins
must be connected to GND
2, 4, 5, 6
3
GND
Supply Voltage. Bypass V
to
CC
V
CC
GND with a 0.1µF capacitor.
Detailed Description
The MAX6676/MAX6677 are high-accuracy, low-current
(80µA, typ) temperature sensors ideal for interfacing with
µCs or µPs. The MAX6676/MAX6677 convert the ambient
temperature into a ratiometric PWM output at a nominal
frequency of 1.8kHz (±20%) at +25°C.
Power Supply from µP Port Pin
The low quiescent current of the MAX6676/MAX6677
enables them to be powered from a logic line, which
meets the requirements for supply voltage range. This
provides a simple shutdown function to totally eliminate
quiescent current by taking the logic line low. The logic
line must be able to withstand the 0.1µ power-supply
bypass capacitance.
The time periods, t1 (low) and t2 (high) (Figure 1), are
easily read by a µP’s timer/counter port. To calculate the
temperature, use the following expression:
Temperature (°C) = 398.15 x (t / t ) - 273.15
1
2
t
2
The µC or µP measures the output of the MAX6676/
MAX6677 by counting t and t and computing the tem-
1
2
perature based on their ratio. The resolution of the count
is a function of the processor clock frequency and the
resolution of the counter. Always use the same clock for
t
1
t and t counters so that the temperature is strictly based
1
2
on a ratio of the two times, thus eliminating errors due to
different clocks’ frequencies.
Figure 1. MAX6676/MAX6677 PWM Output
The MAX6677 (Figure 2a) has a push-pull output with
full CMOS output swings. The ability to source and sink
current allows the MAX6677 to drive capacitive loads up
to 100pF with less than 1°C error.
V
V
CC
CC
The MAX6676 (Figure 2b) has an open-drain output. The
output capacitance should be minimized in MAX6676
applications because the sourcing current is set by the
pullup resistor. If the output capacitance becomes too
large, lengthy rise and fall times distort the pulse width,
resulting in inaccurate measurements.
P
DOUT
DOUT
N
N
(a)
MAX6677
(b)
MAX6676
Figure 2. Output Configurations
Maxim Integrated
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MAX6676/MAX6677
Low-Voltage, 1.8kHz PWM
Output Temperature Sensors
3.3V
V
ISO
V
DD
V
CC
MAX6676AUT3
5.1kΩ
MAX6676
DOUT
DOUT
Figure 3. Galvanic Isolation Using an Optocoupler
Figure 4. Low-Voltage Logic
Galvanic Isolation
Multiple Logic Voltages
Use an optocoupler to isolate the MAX6676/MAX6677
whenever a high common-mode voltage is present.
Choose an optocoupler with equal turn-on and turn-off
times. Unequal turn-on/turn-off times produce an error in
the temperature reading (Figure 3)
Use the MAX6676 open-drain output to drive devices
operating at supply voltages other than the MAX6676’s
V
. As shown in Figure 4, connect a pullup resistor from
CC
the other supply voltage to the MAX6676 output. Limit the
resistor’s current to less than 1mA, thus maintaining an
output low logic level of less than 200mV.
Thermal Considerations
Self-heating may cause the temperature measurement
accuracy of the MAX6676/MAX6677 to degrade in
some applications. The quiescent dissipation and
the power dissipated by the digital output may cause
errors in obtaining the accurate temperature measure-
ment. The temperature errors depend on the thermal
conductivity of the package (SOT23, +140°C/W), the
mounting technique, and the airflow. Static dissipation
is typically 4.0µW operating at 5V with no load. For
example, an out load of 3mA creates a maximum error
of less than 0.1°C.
Chip Information
TRANSISTOR COUNT: 2096
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character,
but the drawing pertains to the package regardless of RoHS
status.
PACKAGE
TYPE
PACKAGE
CODE
DOCUMENT
NO.
LAND PATTERN
NO.
6 SOT23
U6-1
21-0058
90-0175
Maxim Integrated
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MAX6676/MAX6677
Low-Voltage, 1.8kHz PWM
Output Temperature Sensors
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
1
2
10/02
1/03
4/15
Initial release
—
Removed future product designation and revised Typical Operating Characteristics
1, 2, 3
1
Removed the automotive reference from data sheet
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2015 Maxim Integrated Products, Inc.
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