Resistor-Programmable Temperature Switch and Analog Output Sensor from TI
Texas Instruments has introduced what is says is the industry’s smallest (SC70 package) low-power, resistor-programmable temperature switch that operates over the largest supply voltage range. The TMP300 allows for simple temperature monitoring and control. The tiny size of the device makes it an attractive option for power supply systems, DC/DC modules, thermal monitoring and electronic protection systems.
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.
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