SLUSE14A December 2020 – February 2021 BQ76942
The BQ76942 device integrates a voltage ADC that is multiplexed between measurements of cell voltages, an internal temperature sensor, and up to nine external thermistors, as well as performs measurements of the voltage at the VC10 pin, the PACK pin, the LD pin, the internal REG18 LDO voltage, and the VSS rail (for diagnostic purposes). The BQ76942 device supports measurements of individual differential cell voltages in a series configuration, ranging from 3-series cells to 10-series cells. Each cell voltage measurement is a differential measurement of the voltage between two adjacent cell input pins, such as VC1–VC0, VC2–VC1, and so forth. The cell voltage measurements are processed based on trim and calibration corrections, and then reported in a 16-bit resolution using units of 1 mV. The raw 24-bit digital output of the ADC is also available for readout using 32-bit subcommands. The cell voltage measurements can support a recommended voltage range from –0.2 V to 5.5 V. The voltage ADC saturates at a level of 5 × VREF1 (approximately 6.06 V) when measuring cell voltages, although for the best performance, it is recommended to stay at a maximum input of 5.5 V.