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BQ27742-G1: Writing all 0's to RSVD bits resolves high current reading

Mark Pearson
Genius 12705 points
Part Number: BQ27742-G1

A customer of mine has been seeing abnormally high current readings from the BQ27742 gauge until they write 0's to all of the RSVD bits - which seems to resolve this issue.

Have we seen this before?

"On the programming of BQ27742, our custom SW had been writing 0’s to all the RSVD bits.  We now read them and write back what was read.  This seems to have solved the really high current reading."

  • 0
    TI__Guru* 76230 points
    Those bits are marked reserved for a reason and should not be set to 1. Their default values which are typically 0 should be kept.
    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    TI__Genius 12705 points
    Onyx - it is my understanding that the customer is initially not writing anything to the reserved bits - and yet, they see oddly high current reading from the gauge, so they tried writing 0's to all of the RSVD bits & that fixed the problem. So, either the ICs came to them with 1's in one or more of the RSVD bits or they accidentally wrote one or more of the RSVD bits to 1's... and now are correcting this by writing 0's to all of the RSVD bits.
    While I do not know why the bq27742 has issues to start with - it is good to know that writing 0's to the RSVD bits is OK. (and fixes the issue they were seeing)