Texas Instruments Battery Management Unit Impedance Track Fuel (Gas) Gauge Charger Controller Evaluation Module BQ27531E BQ27531EVM Datenbogen
Produktcode
BQ27531EVM
Calibrate Screen
When a check is next to | AutoExport |, the AutoExport is in progress. The same menu selection is used to
turn on/off AutoExport.
turn on/off AutoExport.
If the Data Flash screen is blank, then the bq27531 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 bq27531 is in Sealed mode.
bqEVSW version that is being used. An upgrade may be required. Most of the Data Flash also cannot be
read if the bq27531 is in Sealed mode.
7
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.
depending on the type of calibration being performed. Only one calibration item can be selected and
calibrated at a time.
7.1
To Calibrate the bq27531
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
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 proceeding
with configuration or testing.
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 proceeding
with configuration or testing.
7.2
CC Offset Calibration
This performs the internal calibration of the coulomb counter input offset. Press the Calibrate Coulomb
Counter button.
Counter button.
7.3
Voltage Calibration
•
Measure the voltage across Pack+ and Pack- with a calibrated meter.
•
Type the voltage value in mV into Enter Actual Voltage .
•
Measure the temperature for PACK.
•
Type the temperature value into Enter Actual Temperature.
•
Press the Calibrate Voltage and Temperature as indicated below button.
7.4
Board Offset Calibration
This performs the offset calibration for the current offset of the board. It takes approximately 35 seconds to
complete.
complete.
It is expected that no current is flowing through the sense resistor while performing this calibration step.
Remove load and short PACK– to GND.
Remove load and short PACK– to GND.
Press the Calibration Board Offset button.
7.5
Pack Current Calibration
•
Connect a load to GND and SYS that draws approximately 1 A, or connect a current source to GND
and Pack–. Ensure that the Measured Current reported is negative, or else reverse the connections.
and Pack–. Ensure that the Measured Current reported is negative, or else reverse the connections.
•
Measure the current with a calibrated meter, and type the value into Enter Actual Current using (-) for
current in discharge direction.
current in discharge direction.
•
Press the Calibrate Pack Current button.
19
SLUUA90 – April 2013
bq27531EVM with bq27531 Battery Management Unit Impedance Track™
Fuel Gauge and bq24192 4.5-A, Switch-Mode Battery Charger for Single-Cell
Copyright © 2013, Texas Instruments Incorporated
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