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TMP64

SNIS212 – DECEMBER 2019

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7.3 TMP64 R-T table

The TMP64 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 should always validate the

calculations provided.

7.4 Feature Description

7.4.1 Linear resistance curve

The TMP64 has good linear behavior across the whole temperature range. This allows a simpler resistance to

temperature conversion method that reduces look up table memory requirements. Additionally the linearization

circuitry or midpoint calibration associated with traditional NTCs is not necessary with TMP64.

Because the TMP64 is linear across the entire temperature range, this has an added benefit that the TMP64

does not lose sensitivity at higher operating temperatures.

7.4.2 Positive Temperature Coefficient (PTC)

The TMP64 has a positive temperature coefficient. As temperature increases the TMP64 resistance will increase

leading to a reduction in power consumption of the bias circuit. A negative coefficient system has a power

consumption increase with temperature as the resistance decreases.

The TMP64 also benefits from the reduced power consumption of the bias circuit with less self-heating than a

typical NTC system.

7.5 Device Functional Modes

The device has one mode of operation that applies when operated within the Recommended Operating

Conditions.