Calibration Screen
If the data flash screen is blank, then the bq30z554 in use may not be supported by the EVSW version in
use. An upgrade may be required.
9
Calibration Screen
9.1
How to Calibrate
The bq30z554 must be calibrated using power supplies, or a power supply and cell simulation resistors
(300
Ω
or less) before cells are attached. Before the bq30z554 is calibrated, do the following:
•
Connect and measure a 2-A current source from 1N (–) and Pack (–) to calibrate without using the
FETs (calibration using the FETs is not recommended).
•
Measure each cell voltage.
•
Measure the temperature of the pack.
•
Whether the foregoing steps are necessary depends on the type of calibration being performed.
9.2
Calibrate the bq30z554
To calibrate the bq30z554, do the following:
•
Select the types of calibration to be performed.
•
Enter the measured values for the types selected (except for CC Offset Calibration).
•
If Temperature Calibration is selected, select the sensor that is to be calibrated.
•
Click the appropriate button to initiate the desired calibration.
9.3
Board Offset Calibration
This performs the offset calibration for the current offset of the board.
•
Remove any current source, load, or external voltage from the PACK terminals.
•
Click the Calibrate Board Offset button.
9.4
Pack Voltage Calibration
This calibrates the voltage at the AFE Pack pin.
•
Ensure that Voltage Calibration has been performed for the pack. If Voltage Calibration is not
performed, then Pack Calibration calibrates incorrectly.
•
Remove load and external voltage applied between Pack+ and Pack–.
•
Click the Calibration Pack Voltage button to calibrate.
15
SLUUA36 – November 2012
bq30z554EVM SBS 1.1 Impedance Track™ Enabled Battery Management
Solution EVM
Copyright © 2012, Texas Instruments Incorporated