bq769x0 EVM Quick Start Guide
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GUI should display.
14. Click on the Firmware button at the top of the window to select the firmware view. Click on the
Browse button right of the program window, navigate to the .srec file you stored and select the file.
Click on the Program button. Wait for the programming status window to close, typically about 45 s.
15. Restart the bqStudio software so it can autodetect the device.
16. In the registers view, select the Refresh button and observe that there are 3 cell voltages.
17. Change the cell count to the number of cells supported by the board: Select the Data Memory view,
then the Settings button and the AFE Cell Map register. Change the value to the cells supported
(0x03FF for bq76930EVM, or 0x7FFF for bq76940EVM) and click on the Write to Data Memory
button. Read data memory if desired to confirm the new value.
18. Send a Reset command using the Commands view or the from the Advanced Comm SMB view.
19. Select the Registers view and Refresh the values. Observe that all supported cells now show a
voltage reading.
20. Send the FET_EN command using the Commands view or the from the Advanced Comm SMB view.
21. Select the Registers view and Refresh the values. Observe that the FET_EN bit is now set and that
the CHG and DSG FET status is shown enabled.
22. Select the Calibration bq78350 view.
23. Enter the board temperature in the Temperature Sensor boxes and click on the Calibrate
Temperature button. Wait until a check box appears next to the button.
24. Measure the voltage of the BATT terminals. Divide the value by the number of cells and enter the
value in mV in the Ext Average Cell Voltage box. Click on the Calibrate Voltage button. Wait until a
check box appears next to the button.
25. Disconnect the load from the PACK terminals. Click on the Calibrate CC Offset button and wait until
the check mark appears next to the button.
26. Connect the load set to a known value of approximately 2 A to the PACK terminals. Enter the value in
mA into the Applied Current box. Discharge current should be entered as a negative value. Click on
the Calibrate Current button and wiat until the check mark appears next to the button.
27. Select the Registers view and Refresh the values. Observe the updated voltage, temperature and
current values.
The EVM is functioning and ready for further configuration for evaluation. Refer to the TRM or other
documents for the bq78350, and the other sections of this user guide for additional information.
10
bq76930 and bq76940 Evaluation Module User's Guide SLVU925B–April 2014–Revised July 2014
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