bq78350-r1外部电压不准

The average external cell voltage is measured from a divider to the BAT pin of the bq78350. The resistor divider must be selected to get the voltage in range of the ADC for the BAT pin, and the external cell voltage must be calibrated to scale the ADC reading to the proper voltage.
If using the EVM select the appropriate jumper position for the divider to keep the maximum battery voltage at approximately 1V at the BAT terminal. If using you own board be sure the divider provides this voltage. Then calibrate the external average cell voltage using the bqStudio calibration tab: Measure the battery voltage and divide by the number of cells. Enter that voltage into the "Ext Average Cell Voltage" box and select the "Calibrate Voltage" button.