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Calibrate Screen
The bq27520 allows for an automatic data-flash export function, similar to the DataRAM logging function.
This feature, when selected via | Options | Auto Export |, exports Data Flash to a sequential series of files
named as FilenameNNNNN.gg where N = a decimal number from 0 to 9.
The AutoExport interval is set under the | Options menu | with a minimum value of 15 s. The AutoExport
filename also is set under the | Options menu |.
When a check is next to | AutoExport |, the AutoExport is in progress. The same menu selection is used to
turn on/off AutoExport.
If the Data Flash screen is blank, then the bq27520 that is being used may not be supported by the
bqEVSW version that is being used. An upgrade may be required. Most of the Data Flash also cannot be
read if the bq27520 is in Sealed mode.
8
Calibrate Screen
To ensure proper calibration, perform the following steps. These steps may or may not be required,
depending on the type of calibration being performed. Only one calibration item can be selected and
calibrated at a time.
8.1
To Calibrate the bq27520
Calibrate each item one at a time in the order presented in this document. Select the types of calibration
to be performed by selecting the corresponding checkbox (see
Enter the measured values for the types selected, if necessary.
Then press the Calibrate Part as indicated below button. After all calibration is complete, close the
Calibrate subwindow. While the Calibrate subwindow is open, even in the background, the calibration
routines are running in firmware. Close the subwindow to ensure that they are stopped before you
proceed with configuration or testing.
8.2
CC Offset Calibration
This performs the internal calibration of the coulomb counter input offset. Press the Calibrate Part as
indicated below button.
8.3
Board Offset Calibration
This performs the offset calibration for the current offset of the board. It takes approximately 35 seconds to
complete.
It is expected that no current is flowing through the sense resistor while performing this calibration step.
Remove load and short PACK– to LOAD–.
Press the CC Board Offset Calibration button.
8.4
Voltage Calibration
•
Measure the voltage across Pack+ and Pack- with a calibrated meter.
•
Type the voltage value in mV into Enter Actual Voltage .
•
Press the Calibrate Part as indicated below button.
8.5
Temperature Calibration
•
Measure the temperature for PACK.
•
Type the temperature value into Enter Actual Temperature.
•
Select if the temperature sensor to calibrate is the internal or external.
•
Press the Calibrate Part as indicated below button.
8.6
Pack Current Calibration
•
Connect a load to LOAD– and LOAD+ that draws approximately 1 A, or connect a current source to
12
bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology
Copyright © 2010, Texas Instruments Incorporated
Figure
9).
www.ti.com
SLUU426 – June 2010
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