ISOTMP35RDFPR datasheet(21/44 Pages) TI2

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8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

The ISOTMP35R is designed for temperature measurement in high-voltage systems where electrical isolation

and accurate sensing of localized heat sources are required.

The device operates over a wide supply voltage range from 3.1V to 34V and features low current consumption,

supporting both line-powered and battery-powered applications. The integrated isolation barrier enables direct

placement at high-voltage nodes, eliminating the need for external isolation components and simplifying system

design.

The analog output provides a linear representation of temperature and can be directly interfaced to standard

ADC inputs. Proper system design considerations, including thermal coupling, output loading, and filtering, are

described in the following sections.

8.1.1 Improving Accuracy Using Piecewise Linear Approximation

For applications requiring improved accuracy over the nominal transfer function, a piecewise linear

approximation can be used to better represent the output voltage across temperature.

Although the ISOTMP35R output is highly linear, small deviations from the nominal transfer function can

occur, particularly at temperature extremes. The piecewise linear approach reduces this residual nonlinearity

by dividing the temperature range into multiple segments, each defined by a gain and offset.

This method is most effective in systems that use higher-resolution ADCs, exhibit low system-level noise, and

require improved typical accuracy across the full operating temperature range without extensive calibration.

The output voltage is calculated from the measured temperature using:

VOUT=TC× T−TINFL +VOFFS

(3)

Conversely, the measured temperature can be calculated from the measured output voltage using:

T =VOUT−VOFFS

TC +TINFL

(4)

where:

• VOUT is the output voltage in mV

• T is the measured temperature in °C

• TINFL is the temperature inflection point for a piecewise segment in °C

• TC is the temperature coefficient, or gain, in mV/°C

• VOFFS is the output voltage offset in mV

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ISOTMP35R

SNIS244A – SEPTEMBER 2025 – REVISED MAY 2026

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