DC Power Supply
+ -
Boot
switch
Pull-up
shunts,
Remove
for
EV2400
Install for
EV2300
Remove gauge shunts
Cell simulator switches
on for
power supply
EV2400
U
SB
SMB
I2
C
bq76920 EVM Quick Start Guide
5
SLVU924D – March 2014 – Revised November 2018
Copyright © 2014–2018, Texas Instruments Incorporated
bq76920 Evaluation Module User's Guide
2. Install the bq76940/bq76930/bq76920 evaluation software (see
). Install drivers for the
EV2300, if necessary.
3. Remove shunts from headers connecting the AFE to the gauge.
4. If the EV2300 is used, install shunts on the SCL and SDA pull-up headers. Remove any pull-up shunts
when using the EV2400.
5. Close all dip switch positions (default is closed).
6. Attach the interface board communication adapter to the PC using USB cable. The EV2400 is
recommended, the EV2300 works if it is available and drivers are installed.
7. Attach the interface board I2C connector to the EVM I2C connector using the 4-pin cable.
8. Connect a 0-V DC power supply capable of 250 mA minimum to the “
BATT
” terminals and adjust to
approximately 18 V. The illuminated LED indicates the cell simulator resistor divider is powered.
9. Press and release the
BOOT
switch.
10. Start the bq769X0 evaluation software. The GUI should display. Click on the
Scan
box to enable
repeated update of the display. The power supply may be adjusted within range of the part to observe
voltage changes in the GUI display
Stack V/T/I
section.
11. Set the voltage to approximately 18 V or a mid-range operating level. Clear any faults present by
clicking on the
Clear Faults
button of the
All Read/Write Registers
section of the GUI.
12. Click on the
Continuous
button in the GUI Coulomb Counter section. Enable the CHG_ON and
DSG_ON bits by clicking on the bit and commit the changes. Apply a load to the PACK terminals. Load
current must be within the capability of the supply and the components installed or 15 A, whichever is
lower. Observe the Coulomb Counter value change in the GUI display
Stack V/T/I
section.
13. Make other adjustments as desired, for evaluation.
Refer to other sections of this user guide for additional details.
Figure 1. EVM Connection for Basic AFE Operation