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TMP61-Q1

www.ti.com

SNIS210D – APRIL 2019 – REVISED FEBRUARY 2020

Product Folder Links: TMP61-Q1

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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 TMP61-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 TMP61-Q1 has a nominal resistance at 25 °C (R25) of 10 kΩ with ±1%

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 15. Voltage Biasing Circuit With Linear

Thermistor

Figure 16. Current Biasing Circuit With Linear

Thermistor

Figure 17. Voltage Biasing Circuit With Non-Linear

Thermistor

Figure 18. 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