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BQ32000: Possibility of Crash

Ray Vincent Aranzaso
Mastermind 18180 points
Part Number: BQ32000

Hi,

Good Day. I have a customer who is working with BQ32000. Please see below his query for your reference. Thank you very much.

We are using a BQ32000 Real-Time Clock in a system that should get UL listed.

UL auditor has concerns, that the battery can get charged by the supply voltage if a failure happens.

Is there any safety measure in the chip / the software which makes the clock one failure save?

Our supplier, who develops the electrical system told me, that UL explained the problem should be the bq32000 clock, not the design.

Best Regards,

Ray Vincent

  • 0
    TI__Genius 12400 points

    Hi Ray, 

    The BQ32000 does have a trickle charge feature integrated, and it can be enabled/disabled by writing to  the TCHE[3:0], TCH2, and TCFE bits in registers 8 and 9. From the register descriptions in Section 7.6.2 of the datasheet, it looks like the default register values will leave the switch open so charging won't be enabled until the user writes the registers. If power is lost and the device switches to the backup supply, the registers will reset to the "cycle" values and charging will be disabled. Note that some additional circuitry might be needed to ensure that the battery doesn't get overcharged. Let me know if you have any other questions.

    Regards, 

    Connor