Tool/software:
Using the BQ25723 in a 2S charging design. Reading the ADCVSYSVBAT register (0x2D/2C) results in a reading of reg_0x2C = 22102 (0x5656) REG_ADC_VSYS_VBAT or 0x56*64mV = 5400mV, for these two voltages. Measuring the BQ25723 pins: VSYS and SRN show their values to be closer to 8.3V, the value for a 2S type battery pack.
Is there some other setting that needs to be applied to get these voltages to read back properly? For reference, the other registers are set to these values:
reg_0x00 = 1806 (0x070E) REG_CHARGE_OPTION_0
reg_0x02 = 448 (0x01C0) REG_CHARGE_CURRENT
reg_0x04 = 8400 (0x20D0) REG_CHARGE_VOLTAGE
reg_0x06 = 2500 (0x09C4) REG_OTG_VOLTAGE
reg_0x08 = 15360 (0x3C00) REG_OTG_CURRENT
reg_0x0A = 3264 (0x0CC0) REG_INPUT_VOLTAGE
reg_0x0C = 16896 (0x4200) REG_VSYS_MIN
reg_0x0E = 8192 (0x2000) REG_INN_HOST
reg_0x20 = 33792 (0x8400) REG_CHARGER_STATUS
reg_0x22 = 47232 (0xB880) REG_PROCHOT_STATUS
reg_0x24 = 8192 (0x2000) REG_IIN_DPM
reg_0x26 = 22786 (0x5902) REG_ADC_VBUS_PSYS
reg_0x28 = 512 (0x0200) REG_ADCIBAT
reg_0x2A = 768 (0x0300) REG_ADC_IIN_CMPIN
reg_0x2C = 22102 (0x5656) REG_ADC_VSYS_VBAT
reg_0x2E = 64 (0x0040) REG_MANUFACTURER_ID
reg_0x2F = 224 (0x00E0) REG_DEVICE_ID
reg_0x30 = 16128 (0x3F00) REG_CHARGE_OPTION_1
reg_0x32 = 183 (0x00B7) REG_CHARGE_OPTION_2
reg_0x34 = 1076 (0x0434) REG_CHARGE_OPTION_3
reg_0x36 = 19073 (0x4A81) REG_PROCHOT_OPTION_0
reg_0x38 = 16800 (0x41A0) REG_PROCHOT_OPTION_1
reg_0x3A = 41215 (0xA0FF) REG_ADC_OPTION
reg_0x3C = 72 (0x0048) REG_CHARGE_OPTION_4
reg_0x3E = 108 (0x006C) REG_VMIN_ACTIVE_PROTECTION
