• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 2 answers
  • Subscribers 63 subscribers
  • Views 191 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.

BQ28Z610: OCD Delay time

Fabio Gou
Expert 4445 points
Part Number: BQ28Z610

The customer is using BQ28Z610.

The OCD delay is configurated as 1s.

But in the actual measurement, it will be 1.8s, 1.9s. 2.0s. Is it normal?

What are the internal ADC sampling time and the conversion time?  

  • 0
    TI__Mastermind 27321 points

    Hello Fabio,

    It should not take longer than the programmed OCD delay time unless the OCD conditions have not been met. How are they measuring the delay time?

    Also what is the value of the sense resistor?

    Please share the settings and log file.

    Regards,
    Jose Couso 

  • 0 in reply to Jose Couso
    TI__Expert 4445 points

    Hi Jose, pls see the description as above.

    The OCD have not trigger hardware protection. Only software protection.

    I am not sure for the protection part,

    it use the average value of 4 ADC sampling during 1s or maximum value of 4ADC sampling?

    Could you pls ask FW team to confirm this?

    If the average, then the delay will be (If delay is configurated as 1s) 2s~3s;

    If the maximum, then the delay will be 1s~2s. 

    Thanks

  • 0 in reply to Fabio Gou
    TI__Mastermind 27321 points

    Hello Fabio,

    It is correct, it looks like OCD is FW protection in the BQ28z610. Any FW protection can delay up to 1s plus the programmed delay time. Hence, it is normal what you are seeing.

    The device also offers HW protections which can be used. See below


    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    TI__Expert 4445 points

    I am not sure for the protection part,

    it use the average value of 4 ADC sampling during 1s or maximum value of 4ADC sampling?

    Could you pls ask FW team to confirm this?

    Because I know for the cell discharge terminate voltage, it use the average value of 4 ADC sampling during 1s.

  • 0 in reply to Fabio Gou
    TI__Mastermind 27321 points

    Fabio,

    Firmware Engineer:
    "In single cell to two cells gauges like bq28z610 current measurements are done every 1 second unlike in multicell gauge (more than 2S) where measurements are done every 250ms and there current is average of 4 cells, in bq28z610 current is not averaged. The protection are checked every second so trigger may have 1s resolution depending on when the current was last highest current which trigger the protection was measured."

    It will take the highest ADC from what I can read above. It does not do the average.

    Regards,
    Jose Couso