bq769x0 EVM Quick Start Guide
CAUTION
The circuit module may be damaged by overtemperature. To avoid damage,
monitor the temperature during evaluation and provide cooling, as needed, for
your system environment.
CAUTION
Some power supplies can be damaged by application of external voltages. If
using more than 1 power supply check your equipment requirements and use
blocking diodes or other isolation techniques, as needed, to prevent damage to
your equipment.
CAUTION
The communication interface is not isolated on the EVM. Be sure no ground
potential exists between the computer and the EVM. Also be aware that the
computer will be referenced to the Battery- potential of the EVM.
2.2
Quick Start
Determine if you wish to evaluate the AFE alone or with the gauge. For the AFE, proceed to
.
For the gauge, skip to
2.2.1
AFE Quick Start
These steps describe quick connection of the bq76930 and bq76940 EVMs to demonstrate operation of
the AFE portion of the EVM. For a more detailed description, refer to other sections of the user guide.
Refer to
for the following steps:
1. Download the bq76940/bq76930/bq76920 evaluation software from the tool folder link
or search from
.
2. Install the bq76940/bq76930/bq76920 Evaluation Software. Software can be obtained from
www.ti.com. 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 the 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 38 V
9. Press and release the “BOOT” switch
10. Start the bq769X0 evaluation software. The graphical user interface (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 38 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.
8
bq76930 and bq76940 Evaluation Module User's Guide
SLVU925B – April 2014 – Revised July 2014
Copyright © 2014, Texas Instruments Incorporated