ZHCSTD7A December 2021 – November 2023 BQ79631-Q1
PRODUCTION DATA
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 VS voltages 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 comparators. It serves as a redundancy measurement for thermistor temperature input through the GPIOs. The AUX pins are measured by the AUX ADC and this can also provide redundancy when paired with correspondingly numbered VS inputs.
A third ADC, 16-bit sigma-delta current sense ADC (CS ADC), is integrated to the device for dedicated current measurement. It is designed to work with a low-side current sense resistor. The current sense ADC measures the voltage drop across the current sense resistor with a full scale range of VCS_RANGE.
The subsections below provide an overview of the Main and AUX ADCs measurement paths. See Section 9 for the recommended external component connection. See Section 8.3.5.4 for the diagnostic control function and status of this block.