SNIS211D October 2019 – November 2020 TMP63
The TMP63 silicon linear thermistor has a linear positive temperature coefficient (PTC) that results in a uniform and consistent temperature coefficient resistance (TCR) across a wide operating temperature range. TI uses a special silicon process where the the doping level and active region areas devices control the key characteristics (the temperature coefficient resistance (TCR) and nominal resistance (R25)) . The device has an active area and a substrate due to the polarized terminals. Connect the positive terminal to the highest voltage potential. Connect the negative terminal to the lowest voltage potential.
Unlike an NTC, which is a purely resistive device, the TMP63 resistance is affected by the current across the device and the resistance changes when the temperature changes. In a voltage divider circuit, it is recommended to maintain the top resistor value at 100 kΩ. Changing the top resistor value or the VBIAS value changes the resistance vs temperature table (R-T table) of the TMP63, and subsequently the polynomials as described in the Section 188.8.131.52. Consult Section 8.3.1 for more information.
Equation 1 can help the user approximate the TCR.
Key terms and definitions: