Datasheet

Control Panel Demonstration

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5.2 Measurement Tab

The measurement menu includes an Analog Output section and EEPROM Correction Registers section as

shown in Figure 14.

Figure 14. Measurement Tab in the Control Panel

5.3 Analog Output Section

The Analog Output Section consists primarily of a display of the analog outputs of the bq76925 circuit

including VCOUT, VIOUT, VREF, and THERM.

The analog levels are measured by the onboard MSP430F2122 and then stored internally. The MSP430

updates all of the analog-to-digital converter (A/D) results on a 12-µs interval. The bq76925 software

writes to the control registers in the bq76925 to dictate how the measurement system operates. The

sequence of events is as follows:

1. Set VCOUT to Read Internal Temperature.

2. Delay 40 µs, get A/D Counts for Internal Temperature.

3. Set VCOUT to Read VC6.

4. Delay 40 µs, get A/D Counts for VC6.

5. Set VCOUT to Read VC5.

6. Delay 40 µs, get A/D Counts for VC5.

7. Set VCOUT to Read VC4.

8. Delay 40 µs, get A/D Counts for VC4.

9. Set VCOUT to Read VC3.

10. Delay 40 µs, get A/D Counts for VC3.

11. Set VCOUT to Read VC2.

bq76925EVM Evaluation Module SLUU514– July 2011

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