SLUSE13A January 2020 – May 2021 BQ76952
The BQ76952 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 VC16 pin, the PACK pin, the LD pin, the internal REG18 LDO voltage, and the VSS rail (for diagnostic purposes). The BQ76952 device supports measurement of individual differential cell voltages in a series configuration, ranging from 3-series cells to 16-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 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 best performance it is recommended to stay at a maximum input of 5.5 V.