MAX6676 Datasheet, PDF (1/7 Pages) Maxim Integrated Products – Low-Voltage, 1.8kHz PWM Output Temperature Sensors

19-2660; Rev 1; 1/03
Low-Voltage, 1.8kHz PWM Output Temperature
Sensors
General Description
The MAX6676/MAX6677 are high-accuracy, low-power
temperature sensors with a single-wire output. The
MAX6676/MAX6677 convert the ambient temperature
into a ratiometric PWM output with temperature informa-
tion 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.
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 cur-
rent 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:
Temperature (°C) = 398.15 ✕ (t₁ / t₂) - 273.15
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 avail-
able in space-saving 6-pin SOT23 packages.
Applications
Process Control
Industrial
HVAC and Environmental Control
Automotive
Portable Devices
µP and µC Temperature Monitoring
Isolated Temperature Sensing
Features
o Simple Single-Wire, 1.8kHz PWM Output
o Operates Down to 1.8V
o High Accuracy
±1.5°C at T_A = +25°C
±3.0°C at T_A = 0°C to +85°C
o Operates from -40°C to +125°C
o Low 80µA Typical Current Consumption
o Small 6-Pin SOT23 Package
PART
MAX6676AUT3-T
MAX6676AUT5-T
MAX6677AUT3-T
Ordering Information
TEMP
RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-
PACKAGE
6 SOT23-6
6 SOT23-6
6 SOT23-6
PART
MAX6676AUT3
MAX6676AUT5
MAX6677AUT3
Selector Guide
OUTPUT
TYPE
Open drain
Open drain
Push-pull
SUPPLY
VOLTAGE
RANGE (V)
1.8 to 3.6
3.6 to 5.5
1.8 to 3.6
TOP
MARK
ABBF
ABBG
ABBH
Typical Operating Circuit
Pin Configuration
0.1µF
V_CC
V_CC
DOUT
MAX6676
GND
5.1kΩ*
t₂
t₁
INPUT TO
TIMER/COUNTER
µC
*REQUIRED ONLY FOR MAX6676.
TOP VIEW
DOUT 1
6 GND
MAX6676
GND 2 _MAX6677 5 GND
V_CC 3
4 GND
SOT23
________________________________________________________________ Maxim Integrated Products 1
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