ISOTMP35RDFPR datasheet(14/44 Pages) TI2

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illustrated in Figure 7-4, where the device maintains a controlled and short-duration disturbance before returning

to steady-state operation.

The isolation barrier also supports long-term reliability under continuous voltage stress. Isolation lifetime is

characterized using time-dependent dielectric breakdown (TDDB) models and provides robust performance over

the intended operating life. By integrating isolation directly within the sensor, the ISOTMP35R device enables

accurate and stable temperature measurement in environments where discrete implementations require more

complex system design.

7.3.2 Output Stage and Signal Behavior

The ISOTMP35R provides a low-impedance analog output voltage that is linearly proportional to temperature.

The output stage is designed for direct interfacing to analog-to-digital converters (ADCs) and signal conditioning

networks commonly used in high-voltage systems.

In addition to providing accurate temperature representation, the output stage is optimized for stable operation

under capacitive loading and for robust performance in electrically noisy environments. Output behavior is

influenced by the transfer function, load conditions, and common-mode transients, which are described in the

following sections.

7.3.2.1 Transfer Function

The ISOTMP35R provides an analog output voltage that is linearly proportional to temperature over the full

operating range. This linear relationship simplifies system integration by allowing direct conversion of the output

voltage to temperature using a single scaling factor.

The nominal transfer function is defined as:

VOUT= 10mV°C×T +500mV

(1)

where:

• T is the measured temperature in °C

The measured temperature can be calculated from the output voltage using:

T =VOUT − 500mV

10mV/°C

(2)

where:

• VOUT is the output voltage in mV

This transfer function results in an output voltage of 500mV at 0°C and a slope of 10mV/°C across the entire

temperature range. For example, at 25°C the output voltage is approximately 750mV, and at 100°C the output

voltage is approximately 1.5V. This linear relationship enables direct conversion to temperature without requiring

calibration or digital compensation in most systems.

The accuracy limits specified in Electrical Characteristics include the combined effects of offset, gain error, and

non-linearity. As a result, the nominal transfer function can be used directly in most applications without requiring

additional calibration or compensation.

In systems that require improved typical fitting of the average device response, a piecewise linear approximation

can be applied as described in Section 8.1.1.

ISOTMP35R

SNIS244A – SEPTEMBER 2025 – REVISED MAY 2026

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