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MAX6667：High-Accuracy PWM Output Temperature Sensors

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 200µA. Both 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 35Hz (±20%) at +25°C. The output format is decoded as follows: Temperature (°C) = 235 - (400 × t1)/t2 Where t1 is fixed with a typical value of 10ms and t2 is modulated by the temperature (Figure 1 in the full data sheet). The MAX6666/MAX6667 operate from -40° to +125° and are available in space-saving SOT23 packages.

Key Features Simple Single-Wire PWM Output ±1.0°C Accuracy at +25°C High Accuracy ±1°C at TA = +30°C ±2.5°C at TA = +10°C to +50°C Operate Up to +125°C Low 200µA Typical Current Consumption Small SOT23 package

MAX6666, MAX6667: Typical Operating Circuit Applications/Uses HVAC and Environmental Control Industrial Process Control µP and µC Temperature Monitoring

DataSheet

Parametrics

Quality and Environmental Data

• MAX6667.pdf

Ordering Information