BQ27410EVM Datasheet, PDF (11/18 Pages) Texas Instruments – bq27410EVM: Single-Cell Impedance Track Technology

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Calibrate Screen
If the Data Flash screen is blank, then the bq27410 that is being used may not be supported by the
bqEVSW version that is being used. An upgrade may be required.
9 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 once.
9.1 To Calibrate the bq27410
• Select the types of calibration to be performed (see Figure 9).
• Enter the measured values for the types selected.
• Press the Calibrate Part as indicated below button.
9.2 CC Offset Calibration
• This performs the internal calibration of the coulomb counter input offset.
9.3 Voltage Calibration
• Measure the voltage across Pack+ and Pack–.
• Type the voltage value in mV into Enter Actual Voltage.
• Press the Calibrate Voltage and Temperature as indicated below button.
9.4 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 Voltage and Temperature as indicated below button.
9.5 Board Offset Calibration
This performs the offset calibration for the current offset of the board.
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 Calibrate Board Offset button.
9.6 Pack Current Calibration
• Connect a load to LOAD– and LOAD+ that draws approximately 1 A, or connect a current source to
LOAD– and Pack–.
• Measure the current and type value into Enter Actual Current using (–) for current in discharge
direction.
• Press the Calibrate Pack Current button.
SLUU482A – February 2011 – Revised August 2011
bq27410EVM: Single-Cell Impedance Track™ Technology
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