SLUSDT5B September 2019 – October 2023 BQ75614-Q1
PRODUCTION DATA
When using external thermistor, for ADC measurement only, there is no limitation of what type of thermistors (NTC or PTC) or the bias resistor (R1) value or whether the thermistor is placed on high side or low side with respected to the bias resistor.
However, when using with the integrated OTUT comparators, the programmable OT and UT threshold ranges are designed to work with a 103NTC (10 kΩ at 25°C) type of NTC thermistor, following the connection shown in Figure 9-8 with different options for the R1 and R2 resistors.
The device does not require external RC for temperature measurement. However, it is common for system designer to add an RC filter on the GPIO pin for the NTC circuit. System designer can select the RC values for the application need. Example: RGPIO = 1 kΩ, CGPIO = 0.1 μF to 1 μF.
Unused GPIO must be grounded to AVSS with a 10-kΩ resistor.