MAX6666/MAX6667 High-Accuracy PWM Output Temperature Sensors General Description The MAX6666/MAX6667 are high-accuracy, low-cost,
low-power temperature sensors with a single-wire
output. The MAX6666/MAX6667 convert the ambient
temperature into a ratiometric PWM output with temperature information contained in the duty cycle of the output
square wave. The MAX6666 has a push-pull output and
the MAX6667 has an open-drain output.
The MAX6666/MAX6667 operate at supply voltages from
+3V to +5.5V. The typical unloaded supply current at 5.0V
is 200ВµA. Both devices feature a single-wire output that
minimizes the number of pins necessary to interface with
a microprocessor (ВµP). The output is a square wave with
a nominal frequency of 35Hz (В±20%) at +25В°C. The output
format is decoded as follows: Features в—Џв—Џ Simple Single-Wire PWM Output
в—Џв—Џ В±1.0В°C Accuracy at +25В°C
в—Џв—Џ High Accuracy
В±1В°C at TA = +30В°C
В±2.5В°C at TA = +10В°C to +50В°C
в—Џв—Џ Operate Up to +125В°C
в—Џв—Џ Low 200ВµA Typical Current Consumption
в—Џв—Џ Small SOT23 package Temperature (В°C) = 235 -(400 x t1)/t2
Where t1 is fixed with a typical value of 10ms and t2 is
modulated by the temperature (Figure 1). The MAX6666/
MAX6667 operate from -40В°C to +125В°C and are available in space-saving SOT23 packages. Applications …
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