ISOTMP35RDFPR datasheet(13/44 Pages) TI2

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7 Detailed Description

7.1 Overview

The ISOTMP35R is a linear analog-output temperature sensor with reinforced isolation, intended for accurate

temperature measurement at high-voltage nodes. The device provides a 10mV/°C positive-slope output over

the full –40°C to 150°C temperature range, with a 500mV offset at 0°C. The specified temperature accuracy is

±2.0°C from 0°C to 70°C and ±3.0°C over the full –40°C to 150°C range.

The device operates from a 3.1V to 34V supply, allowing direct integration on a high-voltage plane where a

tightly regulated low-voltage rail is not available. A class-A output driver provides up to 100µA source current

and is designed to interface directly with many ADC inputs, while also supporting higher capacitive loading when

RISO is used as described in Section 7.3.2.2.

7.2 Functional Block Diagram

OUT

GND

Thermal Diodes

TSENSE

ISOTMP35R

–

HEAT ONLY

Figure 7-1. Functional Block Diagram

7.3 Functional Description

The ISOTMP35R integrates a precision temperature sensing element with a reinforced isolation barrier and an

analog output stage. The device is optimized for accurate temperature measurement of localized heat sources

in high-voltage environments. Key functional blocks include the temperature sensing element, isolation barrier,

and analog output driver. Together, these blocks enable direct measurement at the heat source while maintaining

electrical isolation from the system controller.

The following sections describe the analog output behavior, isolation characteristics, and thermal performance of

the device in detail.

7.3.1 Integrated Isolation Barrier

The ISOTMP35R incorporates a reinforced isolation barrier that separates the high-voltage sensing domain from

the low-voltage system domain. This barrier enables safe and reliable temperature measurement in applications

where the sensing location is exposed to high common-mode voltages. The integrated isolation eliminates

the need for external isolation components, such as isolation amplifiers or digital isolators, reducing system

complexity and improving reliability.

In high-voltage systems, fast switching transitions (high dv/dt) can couple through parasitic capacitances and

disturb sensitive analog signals. The ISOTMP35R is designed to minimize this coupling through the internal

isolation structure, providing high common-mode transient immunity (CMTI). This high CMTI performance allows

the output to remain stable during switching events. The output response during a common-mode transient is

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ISOTMP35R

SNIS244A – SEPTEMBER 2025 – REVISED MAY 2026

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