Hysteresis

Control

Positive

Tempco

Reference

HYST

SET

Negative

Tempco

Reference

TMP709

R

SET

R

PULLUP

2.7 V to 5.5 V

OT

VCC

GND

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7

TMP709

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SBOS583B – DECEMBER 2011 – REVISED DECEMBER 2016

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Copyright © 2011–2016, Texas Instruments Incorporated

7 Detailed Description

7.1 Overview

The TMP709 is a fully-integrated, resistor-programmable temperature switch that incorporates two temperature-

dependent voltage references and one comparator. One voltage reference exhibits a positive temperature

coefficient (tempco), and the other voltage reference exhibits a negative tempco. The temperature at which both

voltage references are equal determines the temperature trip point.

The Functional Block Diagram shows the comparator, the NFET open-drain device connected to the OT pin, the

positive tempco reference using the external RSET resistor, the negative tempco reference, and the hysteresis

control. The voltage of the positive tempco reference is controlled by external resistor RSET.

7.2 Functional Block Diagram