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ERROR in bq78350-R1 TRM file

Cheng Wang
Prodigy 685 points
Other Parts Discussed in Thread: BQ40Z50-R1, BQ78350-R1

1. In page 129 : ManufacturerDate: Day + Month × 32 + (Year–1980) × 256

However, base on the date stored in dataflash, it is  Day + Month × 32 + (Year–1980) × 512

2. In page 23: Overcurrent in Discharge Protection


In the Alert, why decrement OCDL count , with condition OCDL count>0? Does it miss one condition for current<OCD:Threshold before the delay time reached.

In the Trip, Is that condition is wrong? Current() continuous <=(>) OCD : Threshold

In the Recovery, is that condition is wrong? Current() continuous >= (<) OCD:Recovery Threshold

In the Latch Reset, does it only need to wait for OCD: Reset time? it turns to be normal again? No other clear command need?

Thanks!

 

 

  • 0
    Intellectual 360 points
    Hi, Cheng

    Just share what I know with you.
    (I am studying bq40z50-R1 which has similar function with bq78350-R1, although not all the same . )

    Q1: Day + Month × 32 + (Year–1980) × 512 is right, 256 is wrong. TI has the same typo in bq40z50-R1
    Q2:
    Current() is negative for discharge and OCD : Threshold should be negative too, so the trip condition is Current() continuous <= OCD : Threshold
    and recovery condition , Current() continuous >= OCD:Recovery Threshold both are right.
    The latch feature is not described clearly here, you may reference the 3.6 Hardware-Based Protection. There has better description for latch function.
    Latch counter increase by trip event, decrease by time(Counter Dec Delay), if it is a event by current spike then the latch counter has chance to decease to 0 by time.
    Once latched (latch counter >=Latch Limit), it will reset by time (Reset Time). I think bq78350-R1 can't detect battery remove or not, so the latch can only reset by time, just like bq40z50-R1 with [NR]=1 configuration.