• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 136 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.

BQ25790: occasionally will set IBAT_OCP_STAT bit

Howard Zou
Genius 12365 points
Part Number: BQ25790

Hi,

my customer is using BQ25790 and will occasionally met the problem that  IBAT_OCP_STAT bit will set, but there is no reason for this bit to set.

My understanding is that  IBAT_OCP_STAT bit will set only when the battery discharge current reaches 11.4A in the datasheet spec.

But there is no chance for them to meet such a high discharge current rating.

We've no idea how to determine the cause of the bit set.

  • 0
    TI__Guru**** 166106 points

    HI Howard,

    We are not aware of any false trip issues with IBAT_OCP.  MInimum is 9.3A.  I suggest monitoring the current which a scope (current probe or differential voltage across a resistor) to see if there is a spike.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    TI__Genius 12365 points

    Jeff,

    I would like to know the implementation of how the device detect OCP.

    Is it that there is an internal hardware comparator that compare the BATFET discharge current with a threshold, and the comparator output will flip when the discharge current is larger than the threshold?

    So we should use a scope to measure the current injecting to BAT pin?

  • 0 in reply to Howard Zou
    TI__Guru**** 166106 points

    Howard,

    You explanation is how I understand OCP works, as well.  So yes, measuring the current going into BAT pin should be the correct method to test.

    Regards,

    Jeff