7.3.1 TMP63-Q1 R-T table

The TMP63-Q1 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.

7.3.2 Linear Resistance Curve

The TMP63-Q1 has good linear behavior across the whole temperature range as shown in Figure 6-3. 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.

7.3.3 Positive Temperature Coefficient (PTC)

The TMP63-Q1 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-Q1 benefits from the reduced power consumption of the bias circuit with less self-heating than a

typical NTC system.

7.3.4 Built-In Fail Safe

The TMP6 family feature a positive tempeature coefficient. During a short-to-supply condition, the thermistor will

have increased current and power dissipated. Due to the positive temperature slope, the TMP6 will increase

resistance and limit self-heating by design.

In contrast, a NTC would continually reduce resistance due to self-heating leading to a positive feedback of

increasing power dissipation and decreasing resistance.

7.4 Device Functional Modes

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

TMP63-Q1

SNIS215C – JANUARY 2020 – REVISED SEPTEMBER 2020

www.ti.com

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