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BQ24190: REG09 when a fault occurs

KANJI SHIBATANI
Mastermind 6205 points
Part Number: BQ24190


Dear Sirs,

 

Hello

I have a questions about 9.3.4.3 Interrupt to Host (INT) on d/s page 22~23.

Please advise.

 

Question1

I had checked NTC_FAULT by remove JP8 on EVM .

Also, I had  checked CHRG_FAULT by apply >18V on VBUS terminal block J1 on EVM.

I think the Fault flag in REG09  is Latched Or NOT latched in case by case.

~~~~

REG09[2:0] NTC_FAULT[2:0] , NOT latched.--> No need to read REG09 two times...?

REG09[5:4] CHRG_FAULT[1:0], Latched  --> the host has to read REG09 two times consecutively.

~~~~~

Is my understanding above, correct?

 

Question 2

I did not tested following, but would you pleaase advise latched or not latched?

REG09[7]  WATCHDOG_FAULT ,Latched?

REG09[3]( BAT_FAULT ) , latched?

REG09[6] (BOOST _FAULT]? latched?

 

Thank you for your support, and with my best regards

 

 

  • 0
    TI__Expert 8230 points
    Hello Kanji,

    All the faults on the bq24190 work under the same principle: the fault trips, the device holds the status of REG09 in the first read, and clears the register on the second read. If the fault condition is still present after the second read, the fault will trip again.

    If the NTC_FAULT is tested by removing JP8, what's going to happen is the fault will trip and after the host reads twice, the fault is going to get cleared and the fault will be set again immediately since the fault condition is still present. Same applies to the other faults.

    The WDT fault works the same, but there is an additional care-about: when the WDT expires, the FAULT register will continue reporting Timer Expiration fault until the WDT is reset or disabled.
  • 0 in reply to Fernando Lopez
    Mastermind 6205 points

     

    Dear Fernando,

    Thank you for your reply quickly. I understand All the faults on the bq24190 work under same principle.

    My( also customer's ) test using EVM may be something wrong ( any noise in case removing jumper?), but please refer to attached ( to cover my poor english).

    If you have any advice about this, please let me know.

     

    Anyway, I will ask customer to read REG09 twice regardless of fault event as per your advice.

    Best Regards

     

     

    REG09.pdf

    REG09.pptx