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TMP64

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SNIS212B – DECEMBER 2019 – REVISED JUNE 2020

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8 Detailed Description

8.1 Overview

The TMP64 silicon linear thermistor has a linear positive temperature coefficient (PTC) that results in a uniform

and consistent temperature coefficient resistance (TCR) across a wide operating temperature range. TI uses a

special silicon process where the the doping level and active region areas devices control the key characteristics

(the temperature coefficient resistance (TCR) and nominal resistance (R25)) . The device has an active area and

a substrate due to the polarized terminals. Connect the positive terminal to the highest voltage potential. Connect

the negative terminal to the lowest voltage potential.

Unlike an NTC, which is a purely resistive device, the TMP64 resistance is affected by the current across the

device and the resistance changes when the temperature changes. In a voltage divider circuit, it is recommended

resistance vs temperature table (R-T table) of the TMP64, and subsequently the polynomials as described in the

Design Requirements section. Consult the TMP64 R-T table section for more information.

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Below are the definitions of the key terms used throughout this document:

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8.2 Functional Block Diagram

Figure 10. Typical Implementation Circuits