RSETA

RSETB

VDD

VDD or VDDIO

RP

RP

SETA

SETB

OUTB

RSETA and RSETB select trip

thresholds and hysteresis options.

TMP39x

C

OUTA

7

TMP392

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SNIS216 – NOVEMBER 2019

Product Folder Links: TMP392

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Copyright © 2019, Texas Instruments Incorporated

7 Detailed Description

7.1 Overview

The TMP392 ultra-low power, dual channel, resistor programmable temperature switches enable detection and

protection of system thermal events over a wide temperature range. The TMP392 offers dual overtemperature

(hot and warm) detection. Channel A is referred to as the hot channel, and Channel B is referred to as the warm

channel. The trip temperatures and hysteresis options are programmed by two E96-series (1%) standard decade

value resistors on the SETA and SETB pins. The TMP392 can enable a customer board-level manufacturing test

through the trip test function that can force the SETA or SETB pins to logic high to activates the digital outputs.

7.2 Functional Block Diagram

Figure 7. Simplified Schematic

7.3 Feature Description

The TMP392 requires two resistors to set the two trip points and hysteresis, according to Table 1 and Table 2 for

the hot and warm channel device. The output of the TMP392 is open-drain and requires two pullup resistors. TI

recommends to use a pullup voltage supply that does not exceed VDD + 0.3 V. The pullup resistors used in

between the OUTA and OUTB pins and the pullup supply should be greater than 1 kΩ. The device powers on

when the supply voltage goes beyond 1.5 V, and starts sampling the input resistors to set the two trip points and

hysteresis value after power-on. These values will remain the same until the device goes through a power cycle.

After the device sets the trip points and hysteresis level, the device will update the output every half a second.

The conversion time is typically 0.65 ms when the temperature is checked against the trip points and the outputs

are updated. The device remains in standby mode between conversions. If either channel is not used, the output

can be grounded or left floating.

7.3.1 TMP392 Programming Tables

The temperature threshold and hysteresis options for the TMP392 device are programmed using two external

1% E96 standard resistors. The specific resistor value to ground on the SETA input sets the temperature

threshold of channel A. The specific resistor value to ground on the SETB input sets the temperature threshold of

channel B, as well as the hysteresis for both channel A and channel B.

Table 1. TMP392 Channel A Threshold Setting

CHANNEL A (HOT)

TRIP TEMPERATURE

(°C)

CHANNEL A NOMINAL 1%

RESISTORS (KΩ)

CHANNEL A (HOT) TRIP RESET

TEMPERATURE (°C) FOR

HYSTERESIS = 5°C

CHANNEL A (HOT) TRIP RESET

TEMPERATURE (°C) FOR

HYSTERESIS = 10°C

30

1.05

25

20

32

1.21

27

22