BQ76930EVM: Hardware configuration

Hi Nati,

See the BQ76930 data sheet table 7 for what pins to short together.  

For a simple test with the EVM short Cell3 input to Cell 4, and Cells 7, 8, 9 inputs at the terminal block.

If you are modifying the EVM board select the appropriate components from table 3:

Hi Nati,

Since you are using 7 cells on a part and board capable of 10 cells, 3 will not be used.  Those 3 unused cells are recommended to be cells 9, 8 and 4 of the BQ76930 as shown in the table.  When shorting the IC inputs the part will not have a cell voltage applied to those inputs.  The external balance transistors will need a path for current on the EVM, so the cell inputs need to be shorted at the terminal block of the EVM.  With the pins shorted at the IC and the terminal block, the EVM will have multiple parallel paths which will reduce the effective resistance from the terminal block to the IC pins.  Removing the resistors (R28, R38) removes those parallel paths so that the resistance is appropriate for the circuit.

The blue marking in table 25 shows a mapping of the physical cells of the pack to the inputs of the IC.  Again the battery will have 7 cells while the IC is capable of 10.  Counting cells from the bottom up:

• The BQ76930 IC cell 10 inputs are used for Cell 7 of the battery
• The IC cell 7 inputs are used for Cell 6 of the battery 
• The IC cell 6 inputs are used for Cell 5 of the battery 
• The IC cell 5 inputs are used for Cell 4 of the battery
• The cell 3 down to cell 1 inputs match.

You asked about the gg.csv file in your first post which I missed.  In the BQ78350-R1 you will need to set the  AFE Cell Map to match the cells used, this is much like the map shown, set a bit to 1 to match the cells used.  For 7 cells shown in the table above set 0x0277.  See the BQ78350-R1 technical reference manual section 2.6.3 AFE Cell Map for details.

Select other settings in the BQ78350-R1 as appropriate for your design.