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Calibration
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.
It is expected that no current is flowing through the sense resistor while performing this calibration step.
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.
•
Measure the current with a calibrated meter, and type the value into Enter Actual Current using (-) for
current in discharge direction.
•
Press the Calibrate Gas Gauge button.
20
bq27531EVM With bq27531 Battery Management Unit Impedance Track™
Fuel Gauge and bq24192 4.5-A, Switch-Mode Battery Charger for Single-Cell
Applications
Figure 12. Calibration Screen
Copyright © 2013–2016, Texas Instruments Incorporated
www.ti.com
SLUUA90A – April 2013 – Revised July 2016
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