SLUAAQ5 May 2024 BQ769142 , BQ76942 , BQ76952 , BQ76972
The BQ769x2 device family requires at least 3 cells at all times to operate. These cells must be placed in ascending order so that so that there are cells between VC0-VC1, VC1-VC2, and VC15-VC16. The lowest cell, cell 1, must be connected at between VC0 and VC1, the next higher voltage, cell two between VC1 and VC2. This continues so that the next higher voltage is placed between the next two lowest used pins and so forth. Due to the high voltage tolerance on each of the VCx pins, the time at which each cell is connected to the device does not matter. Therefore, the device allows random cell connections on all VCx pins.
When reducing the cell count below the maximum for the device, is necessary to update the software configuration on the chip to prevent the device from reading the bypassed cells as an undervoltage fault. The user must modify the Settings:Configuration:Vcell Mode register to accurately reflect which cells are in use to prevent these faults.