Operation
9
SLUUBF9 – March 2016
Copyright © 2016, Texas Instruments Incorporated
bq4050EVM-561 Evaluation Module
3.3.3
Current Calibration
The
Board Offset
calibration option is not offered in
Battery Management Studio
, because it is not required
when using the bq4050EVM. The
Board Offset
calibration option is available in bqProduction.
•
Connect and measure a 2-A current source from 1N (–) and Pack– (+) to calibrate without using the
FETs.
•
Enter –2000 in the
Applied Current
field and select the
Calibrate Current
box.
•
Press the
Calibrate Gas Gauge
button to calibrate.
•
Deselect the
Calibrate Current
box after current calibration has completed.
NOTE:
Current can also be calibrated using the FETs. Measure the current in the discharge path
and enter this value in the
Applied Current
field.
3.4
Setting the CEDV Parameters
To ease evaluation of the bq4050, obtain the CEDV parameters from our online gauging parameter
calculator (GPC) for CEDV gauges tool (
). After programming the design
parameters to the gauge, the EVM can be used to obtain the experimental data needed to calculate the
CEDV coefficients.
Figure 6. CEDV Coefficients Calculation Flow
The equipment necessary is as follows:
•
bqStudio software
•
bq4050EVM-561
•
Power supply to charge the pack and a load to discharge the pack.
Refer to
CEDV Data Collection for Gauging Parameter Calucalator (GPC)
(
) for a detail
explanation of the CEDV coefficients data collection process and GPC tool configuration.
