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Calibration Screen

8 Calibration Screen

To ensure proper calibration, proceed in the order that follows. These steps may or may not be required,

depending on the type of calibration being performed.

8.1 To Calibrate the bq28550

1. Select the types of calibration to be performed (see Figure 9 and Figure 10).

2. Enter the measured values for the types selected.

The calibration routine consists of two tabs. The first tab is for Voltage and Temperature. The second

tab is for CC Offset, Board Offset, and Current calibration.

3. Ensure that the Keep Scanning checkbox in the SBS screen is unchecked.

4. If Temperature Calibration is selected, then select the sensor that is to be calibrated.

8.2 Voltage and Temperature Calibration

1. Select the Voltage and Temperature tab.

2. Remove the load applied between Pack+/Load+ and Pack–/Load–.

3. Ensure that voltage is stable before performing voltage calibration. Measure the voltage across Cell+

and Cell–. Type the voltage value in mV into Enter Actual Voltage.

4. Measure the temperature near the sensor to be calibrated. Type the temperature value into Enter

Actual Temperature. Select if the temperature sensor to calibrate is the internal or the external

sensor.

5. Click the Calibrate Voltage and Temperature as indicated below button.

Figure 9. Voltage and Temperature Calibration Screen

SLUU520– July 2011 bq28550 Single Cell Li-Ion Battery Gas Gauge and Protection EVM

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