TMP6331QDECRQ1 datasheet(9/26 Pages) TI

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7 Detailed Description

7.1 Overview

The TMP63-Q1 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 TMP63-Q1 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 to maintain the top resistor value at 100 kΩ. Changing the top resistor value or the VBIAS value

changes the resistance vs temperature table (R-T table) of the TMP63-Q1, and subsequently the polynomials as

described in the Section 8.2.1.1. Consult Section 7.3.1 for more information.

Equation 1 can help the user approximate the TCR.

TCR (ppm/°C) = (RT2 – RT1) / ((T2 – T1) × R(T2+T1)/2)

(1)

Key terms and definitions:

• ISNS: Current flowing through the TMP63-Q1 device

• VSNS: Voltage across the two TMP63-Q1 terminal

• IBIAS: Current supplied by the biasing circuit.

• VBIAS: Voltage supplied by the biasing circuit.

• VTEMP: Output voltage that corresponds to the measured temperature. Note that this is different from VSNS. In

the use case of a voltage divider circuit with the TMP63-Q1 in the high side, VTEMP is measured across RBIAS.

7.2 Functional Block Diagram

VTEMP

VBIAS

VTEMP

VBIAS

IBIAS

TEMP = I BIAS × R TMP63

TEMP =

VBIAS × R TMP63

R BIAS + R TMP63

RBIAS

RTMP63

Figure 7-1. Typical Implementation Circuits

7.3 Feature Description

www.ti.com

TMP63-Q1

SNIS215C – JANUARY 2020 – REVISED SEPTEMBER 2020

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