6 Detailed Description

6.1 Overview

The ISOTMP35R is a linear analog output temperature sensor with an output voltage proportional to

temperature. The temperature sensor has an accuracy of ±1.5°C from 0°C to 70°C and ±2.5°C over the full

temperature range of –40°C to 150°C. The ISOTMP35R provides a positive slope output of 10mV/°C over the

full –40°C to 150°C and a supply range from 3V to 34V. A class-A output driver provides a maximum output

current of 100µA to drive capacitive loads up to 220nF.

6.2 Functional Block Diagram

VOUT

VDD

GND

Thermal Diodes

TSENSE

TSENSE

TSENSE

Heat only

TSENSE

TSENSE

TSENSE

ISOTMP35R

+

–

90

Ω

Figure 6-1. Functional Block Diagram

6.3 Features Description

The ISOTMP35R device combines a robust integrated isolation barrier with a tight accuracy analog output

temperature sensor. All the features related to the analog output, accuracy, output characteristics of the sensor,

and drive characteristics of the output are discussed in the analog output section.

6.3.1 Integrated Isolation Barrier and Thermal Response

The ISOTMP35R is designed to integrate a robust isolation barrier while maximizing heat flow of a local heat

source. This is made possible by an SSOP-12 package designed to provide a 5kVRMS isolating rating (UL 1577)

along with an isolation mechanism that minimizes thermal response from the TSENSE pins to the temperature

sensor.

6.3.2 Analog Output

The analog output of the ISOTMP35R has several characteristics, such as the output accuracy, linearity, and

drive capability, that must be understood to design the interface to the rest of the signal chain.

6.3.2.1 Output Accuracy

As illustrated in Figure 5-2, the ISOTMP35R device's output is linear with a 500mV offset voltage and a

temperature coefficient or sensor gain of 10mV/°C. The ISOTMP35R, therefore, adheres to a simple transfer

function given as

VOUT = (10mV/°C × TA) + 500mV

(1)

where

• TA is the Ambient Temperature in °C.

ISOTMP35R

SNIS244 – SEPTEMBER 2025

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