Resistor-Programmable Temperature Switch and Analog Output Sensor from TI

The TMP300 features a trip point that is set by adding a single, inexpensive resistor, and the open-drain output can control a power switch or provide a processor interrupt. A separate pin on the device provides an analog output (10mV/C) that can serve as a testing point or can be used in temperature-compensation loops. With a wide supply voltage range of 1.8V to 18V, the TMP300 allows for simple thermal monitoring without requiring an MCU/DSP. This lets the device take advantage of existing power buses in numerous applications, from battery-powered handhelds to industrial control systems. Further, the device’s low power of 110uA (max) extends battery life.

The analog output measures temperature with ±3C accuracy (max) and the temperature switch has ±4C switch accuracy over a temperature range of -40C to 125C. Hysteresis of the TMP300 is pin programmable to two states of either 5C or 10C.