Texas Instruments bq27421 EVM, User Manual, Page: 13 / 21

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Calibration
13 SLUUA63A – April 2013 – Revised July 2016
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bq27421 EVM: Single-Cell Impedance Track Technology
8 Calibration
The bq27421EVM must be calibrated to ensure accurate value reporting. This is done using the
Calibration window in bqStudio ( Figure 11 ).
8.1 Calibrating the bq27421
1. Select the types of calibration to be performed (see Figure 11 ).
2. Enter the measured values for the types selected.
3. Press the button to calibrate.
8.2 Voltage Calibration
Voltage calibration usually is not required. If needed, follow these steps:
1. Measure the voltage across Pack+ and Pack–.
2. Type the voltage value in mV into Enter measured value .
3. Press the Calibrate button.
8.3 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.
1. Remove load and short PACK– to LOAD–.
2. Press the Calibrate button.
Figure 11. Calibration Screen