• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 228 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ76930: Application problems of BQ76930

Jimmy Zhou95
Intellectual 870 points
Part Number: BQ76930
Other Parts Discussed in Thread: TIDA-00792

I have some questions with BQ76930:
1.What is the display value when BQ76930 sense the battery voltage below 2V?
2.What is the current sensing accuracy of BQ76930?
3.The TS1 pin of BQ76930 is connected to a switch as datasheet shown. It is said that BQ76930 will start after pressing the bottom 2ms. How can I eliminate the switch with the BQ76930 starting working automatically?

  • 0
    TI__Guru 54715 points

    Hi Jimmy,

    1. The ADC of the bq76930 will continue to convert and display voltages.  The error will increase and may be beyond the spec which applies above 2V when below 2V.

    2. Current sensing accuracy of the bq76930 hardware protection is specified in the data sheet OCOFFSET and OCSCALEERR.  For the coulomb counter see the 16-BIT CC FOR PACK CURRENT MEASUREMENT section and be sure to set the CC_CFG REGISTER to the recommended 0x19 value.

    3. Use a circuit to provide a pulse to the TS1 pin to wake the part when desired.  An appropriate circuit will vary depending on your system design.  See the application note bq769x0 boot switch alternatives for ideas. TIDA-00792 has an example of a wake up circuit from the charger connection with high side protection switching.