The TMP390 is an ultra-low power, dual-trip, dual-output, resistor-programmable temperature switch. This device enables thermal protection and thermal event monitoring over a wide temperature range. The TMP390 offers independent overtemperature (hot) and undertemperature (cold) detection in the temperature range from –55°C to +130°C with ±2.5°C trip accuracy. The Texas Instruments TMP390EVM (Evaluation Module) is easy to use and can evaluate the performance of the TMP390 right out of the box. The EVM has pre-populated resistors corresponding to a hot and cold trip point with 5°C hysteresis, and LED indicators at the outputs of the device. The trip test function is available through the use of onboard push buttons to test the output of both channels. The sensor is also located on a perforated portion of the PCB that can be separated from the main board for prototyping. The TMP390EVM does not require any calibration or software programming, as the trip points are programmed through two resistors. This document provides detailed information about the device operation and evaluation board features.
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The TMP390EVM allows users to evaluate the performance of the TMP390 dual-trip programmable temperature switch. The EVM comes in a USB stick form factor that can plug into a USB port to supply power and begin the evaluation of the temperature switch. The hardware is as shown in Figure 1. The module is designed so all of the features, including the manual trip test and reset of both channels, are readily available for testing. Two LED indicators are illuminated when either output of the TMP390 is triggered based on the temperature trip point. The EVM also features a perforated breakout portion of the board which can be wired to test the TMP390 in either an existing system or an oven.