11

TMP63

www.ti.com

SNIS211C – OCTOBER 2019 – REVISED JUNE 2020

Product Folder Links: TMP63

Submit Documentation Feedback

Copyright © 2019–2020, Texas Instruments Incorporated

9 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.

9.1 Application Information

The TMP63 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 operating

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.

9.2 Typical Application

9.2.1 Thermistor Biasing Circuits

Figure 11. Voltage Biasing Circuit With Linear

Thermistor

Figure 12. Current Biasing Circuit With Linear

Thermistor

Figure 13. Voltage Biasing Circuit With Non-Linear

Thermistor

Figure 14. Current Biasing Circuit With Non-Linear

Thermistor

9.2.1.1 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

voltage across the thermistor, 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 thermistor can be biased directly using a precision current source