7.3.2 Analog Output

The analog output of the ISOTMP35 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.

7.3.2.1 Output Accuracy

As illustrated in Figure 6-1, the ISOTMP35 device is linear with a 500 mV offset at 0°C. However for temperature

greater than 100°C, a gain shift occurs. See Output Voltage Linearity for an approximation if using a lookup table

to convert the voltage to temperature.

7.3.2.2 Output Voltage Linearity

As illustrated in Figure 6-2, the ISOTMP35 device exhibit a linear output of 10 mV/°C. Use Equation 1 to

calculate the output voltage.

VOUT = (TA - TINFL) ✕ TC + VOFFS

(1)

where

• VOUT is the ISOTMP35 voltage output for a given temperature

• TA is the ambient temperature in°C

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

• TC is the ISOTMP35 temperature coefficient or gain

• VOFFS is the ISOTMP35 voltage offset

7.3.2.3 Drive Capability

A class-AB output driver provides a maximum output of 500 µA to drive capacitive loads up to 1000 pF. To

design the time and frequency domains signal-chain implementation, use the driver output impedance graph

provided in Figure 6-11.

7.3.3 Thermal Response

The SOIC-7 package is designed to maximize the heat flow, and minimize the thermal response time, from the

TSENSE pins to the temperature sensor while also providing the 3 kVRMS isolation rating (UL1577).

7.4 Device Functional Modes

The singular functional mode of the ISOTMP35 is an analog output directly proportional to temperature.

ISOTMP35

SNIS232 – OCTOBER 2023

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