8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification, and TI

does not warrant its accuracy or completeness. TI’s customers are responsible for determining

suitability of components for their purposes. Customers should validate and test their design

implementation to confirm system functionality.

8.1 Application Information

The TMP63-Q1 is a positive temperature coefficient (PTC) linear silicon thermistor. The device behaves as a

temperature-dependent resistor, and may be configured in a variety of ways to monitor temperature based on

the system-level requirements. The device has a nominal resistance at 25 °C (R25) of 100 kΩ , a maximum

variety of applications to monitor temperature close to a heat source with the very small DEC package option

compatible with the typical 0402 (inch) footprint. Some of the factors that influence the total measurement error

include the ADC resolution (if applicable), the tolerance of the bias current or voltage, the tolerance of the bias

resistance in the case of a voltage divider configuration, and the location of the sensor with respect to the heat

source.

8.2 Typical Application

8.2.1 Thermistor Biasing Circuits

Figure 8-1. Voltage Biasing Circuit With Linear

Thermistor

Figure 8-2. Current Biasing Circuit With Linear

Thermistor

Figure 8-3. Voltage Biasing Circuit With Non-Linear

Thermistor

Figure 8-4. Current Biasing Circuit With Non-Linear

Thermistor

8.2.1.1 Design Requirements

Existing thermistors, in general, have a non-linear temperature vs. resistance curve. To linearize the thermistor

response, the engineer can use a voltage linearization circuit with a voltage divider configuration, or a resistance

the engineer can use a voltage divider circuit with the thermistor placed at either the high side (close to supply)

or low side (close to ground), depending on the desired voltage response (negative or positive). Alternatively, the

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TMP63-Q1

SNIS215C – JANUARY 2020 – REVISED SEPTEMBER 2020

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Product Folder Links: TMP63-Q1