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BQ76930: internal temperature is going to zero

Mostafa Belali
Prodigy 10 points
Part Number: BQ76930
Hi all,
I would like to get temperature via 10k Thermistors on TS1 and TS2
we have more than 200 devices produced
but in some of these devices, we have the same problems:
1- TS1 and TS2 registers are equal to zero
2- we don't have any pulse on TS1 or TS2
3- we don't have any pulse in alert pin
But all other ADCs work properly and we have the right amount of voltage for all batteries.
The cases of OV, UV, OCD, SCD, and XREADY have already been taken care of in our program.
we are using BQ76930.
  • 0
    TI__Guru 54715 points

    Hi Mostafa,

    It is not a known mode of operation.  If the voltage ADC is operating normally it should convert the internal or external temperature every 2 seconds. 

    XREADY does prevent the voltage ADC from updating, you might be sure the values are "live" and that the registers are not displaying dormat values because of an XREADY that the host is attempting to clear. 

    ALERT will set high if any status register bit is set, CC_READY is periodic if the CC is enabled continuously, if XREADY is set in the possible scenario above ALERT would be set from it.  If ALERT were somehow shorted it would not go high but you should see the bits in the status register.  

    There may be some damage to the part.  You might swap parts between working and non-working parts to see if the issue follows the IC or board.