There are two SAR ADCs in the device, a 16-bit Main ADC and a 14-bit AUX ADC; both use a precision reference (REFH) for high-accuracy measurement. Each ADC has its own independent control and can be enabled or disabled separately. The Main ADC is the main measurement for cell voltages (VCELL) and temperature through thermistors connecting to the GPIOs. It also provides TSREF and die temperature measurements. The AUX ADC is mainly used during diagnostic procedures such as providing measurements on internal reference voltages or DAC output of the OVUV and OTUT comparators. It serves as a redundancy measurement for cell voltage inputs and thermistor temperature input through the GPIOs.

The subsections below provide an overview of the Main and AUX ADCs measurement paths. See Section 10 for the recommended external component connection. See Section 9.3.6.4 for the diagnostic control function and status of this block.