Texas Instruments TMP709 Series Digital Temperature Sensor, Digital Output, Surface Mount, Digital Output, ±3°C, 5 Pin

The Texas Instruments digital temperature sensor is a fully integrated, resistor programmable temperature switch with a temperature threshold that is set by just one external resistor within the entire operating range. The sensor provides an open drain, active low output. This sensor has low quiescent current of 40 micro Amp. The device has a single functional mode. Normal operation for the device occurs when the power supply voltage applied across the VCC and GND pins is within the specified operating range of 2.7 V to 5.5 V.

Low quiescent current
Open drain
Active low output stage
Reset operation specified at VCC equal to 0.8 V
Always connect the HYST pin to either VCC or GND.