Resistor-programmable temperature switch enables protection

22nd January 2020
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The TMP390-Q1 device from Texas Instruments is part of a family of ultra-low power, dual channel, resistor programmable temperature switches that enable protection and detection of system thermal events from -40 to +125°C. The TMP390-Q1 offers independent overtemperature (hot) and undertemperature (cold) detection. 

The trip temperatures (TTRIP) and thermal hysteresis (THYST) options are programmed by two E96-series resistors (one percent tolerance) on the SETA and SETB pins. Each resistor can range from 1.05 to 909KΩ, representing one of 48 values.

The values of the resistor to ground on SETA input sets the TTRIP threshold of Channel A. The value of the resistor to ground on SETB input sets the TTRIP threshold of Channel B, as well as the THYST options of 5, or 10°C for both channels, to prevent undesired digital output switching. Resistors accuracy has no impact to TTRIP accuracy.

To enable customer board-level manufacturing, the TMP390-Q1 supports a trip test function where the digital outputs are activated by exercising the SETA or SETB pin.

To learn more, click here.

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