BQ76940EVM: BQ96740EVM board testing

Hi Rajaneesh,
If evaluating with a power supply connect like figure 1 of the EVM user guide. Short the appropriate cell inputs at the terminal blocks to simulate your desired cells.
If connecting cells, the top and bottom of the battery stack connect to BATT+ and BATT- of the board, and each cell tap connects to the appropriate terminal block terminal including the top and bottom of the stack. Cell 15 and BATT+ must be connected together outside the board. Similarly Cell 0 and BATT- must be connected outside the board. The resistor divider should not be used as it will drain the cells.
1. Something is not connected properly. Use the meter to find where the voltage is lost and connect properly. If the proper voltage is present on VC1 with respect to VC0, and VSS is connected to the same voltage as VC0, the device must be damaged.
2. There should be no power supply used with cells unless it is to charge the battery.
3. Check connections. Battery charge would come from the PACK terminals if the FETs are enabled. Cell balancing would be controlled manually by the operator. The bq76940 does not automatically balance cells. If the cell balance registers are set to non-zero values the part will continue to balance until the cells are depleted. The controller must decide when to balance.
4. The coulomb counter reading represents the voltage across the sense resistor during the preceeding 250ms interval. It is an integrated value.
5. Yes, internal is die temperature and external is from the thermistor. Note these are voltage readings and must be converted to temperature by the controller.

Hi Rananeesh,
Since the board was running possibilities may be:
I2C address changed in the window unintentionally
Wire came loose for power or communication
Pull up shunt came loose if using EV2300
Short of some signal on the board cutting off the power or damaging the part