Texas Instruments bq76920EVM, User Manual, Page: 6 / 46

bq76920 EVM Quick Start Guide
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6 SLVU924D – March 2014 – Revised November 2018
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bq76920 Evaluation Module User's Guide
2.2.2 Gauge Quick Start
These steps describe quick connection of the bq76920 EVM to demonstrate operation of the gauge
portion of the EVM. For more detailed descriptions, refer to other sections of the user guide. If you are
new to bqStudio software, you may wish to refer to the more detailed instructions for installing the
software in
Section 5 before using the quick start.
Refer to Figure 2 for the following steps.
1. Download the Battery Management Studio (bqStudio) software from the latest bq78350 product folder
link www.ti.com/product/bq78350-R1 or search from www.ti.com .
2. Install the bqStudio software. Install drivers for the EV2300, if necessary.
3. Install 4 shunts on the J12 header connecting the AFE to the gauge: GG_SCL, GG_SDA, GG_PWR
and GG_ALERT.
4. Install shunts on the SCL and SDA pull-up headers.
5. Install shunts on the /KEY, /PRES and 16/17 positions of the other headers.
6. Close all dip switch positions (default is closed).
7. Attach the interface board communication adapter to the PC using USB cable. The EV2400 version
0.18 or later may be used. Check the EV2400 tool folder for available updates. Do not use the original
0.05 version EV2400 since it may damage the EVM. The EV2300 works if it is available and drivers
are installed.
8. Attach the interface board SMB connector to the EVM SMB connector using the 4-pin cable.
9. Remove any connection to the I2C connector. This connector must remain open for operation with the
gauge.
10. Connect a 0-V DC power supply capable of 2 A minimum to the “ BATT ” terminals and adjust to
approximately 15 (3V/cell) V. The illuminated LED indicates the cell simulator resistor divider is
powered.
11. Press and release the BOOT switch.
12. Start the bqStudio software. The EVM has shipped with different versions of the bq78350 firmware.
Observe the windows which display as the software starts. If a Register View window appears similar
to
Figure 11 , check the gauge device version in the dashboard view on the left side of the window. If
the version is the latest, proceed to , otherwise perform the following steps. At this update bq78350-R1
is the production version, bq78350-R2 firmware is available.
a. The bq78350 on the initial EVMs shipped blank, so the bqStudio will present a Target Selection
Wizard box. Select the latest version of the bq78350 from the list and select the Finish button.
Acknowledge the Proceed and the Battery Management Studio Timeout windows. The GUI should
display similar to
Figure 8 .
b. If the gauge is not blank it will display the version in the dashboard similar to Figure 10 . If the
version is correct proceed with evaluation.
c. Download the bq78350_xx firmware bundle from the latest bq78350 product folder such as
www.ti.com/product/bq78350-R1 , save it to a temporary location on your computer, and run the
installer. Observe the installation directory of the firmware file, typically C:\ProgramData\Texas
Instruments\bq78350xxFirmwareBundle-xxxx
d. Click on the bqStudio Firmware button at the top of the window to select the firmware view.
e. Click on the Browse button right of the program window, navigate to and select the installed .srec
file.
f. Click on the Program button. Wait for the programming status window to close, typically about 45
s.
g. Restart the bqStudio software so it can autodetect the device.
13. In the registers view, select the Refresh button and observe that there are 3 cell voltages.
14. 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 0x001F and click on the
Write to Data Memory button. Read data memory if desired to confirm the new value.
15. Send a Reset command using the Commands view or the from the Advanced Comm SMB view.