Ultra-small, dual-channel (hot & cold trip), 0.5-µA, resistor-programmable temperature switch

The TMP390 device 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 –50°C to

130°C. The TMP390 offers

independent overtemperature (hot) and

undertemperature (cold) detection

. The

trip temperatures (TTRIP) and thermal

hysteresis (THYST) options are

programmed by two E96-series resistors (1%

tolerance) on the SETA and SETB pins. Channel A

resistors can range from 1.05 KΩ to 909 KΩ,

representing one of 48 unique values. Channel B

resistors can range from 10.5 KΩ to 909 KΩ

The value 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°C, or

10°C for both channels, to prevent undesired

digital output switching. When the SETB input is

connected to ground, Channel A operates with 20°C

hysteresis. Resistors accuracy has no impact to

TTRIP accuracy.

To enable customer board-level manufacturing, the

TMP390 supports

a trip test function where the digital outputs are

activated by exercising the SETA or SETB pin.