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TMP63

SNIS211B – OCTOBER 2019 – REVISED MARCH 2020

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8.3 TMP63 R-T table

The TMP63 R-T table must be re-calculated for any change in the bias voltage, bias resistor, or bias current. TI

provides a Thermistor Design Tool to calculate the R-T table. The system designer must always validate the

calculations provided.

8.4 Feature Description

8.4.1 Linear Resistance Curve

The TMP63 has good linear behavior across the whole temperature range as shown in Figure 3. This range

allows a simpler resistance-to-temperature conversion method that reduces look-up table memory requirements.

The linearization circuitry or midpoint calibration associated with traditional NTCs is not necessary with the

device .

The linear resistance across the entire temperature range allows the device to maintain sensitivity at higher

operating temperatures.

8.4.2 Positive Temperature Coefficient (PTC)

The TMP63 has a positive temperature coefficient. As temperature increases the device resistance increases

leading to a reduction in power consumption of the bias circuit. In comparison, a negative coefficient system

increases power consumption with temperature as the resistance decreases.

The TMP63 benefits from the reduced power consumption of the bias circuit with less self-heating than a typical

NTC system.

8.5 Device Functional Modes

The device operates in only one mode when operated within the Recommended Operating Conditions.