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Original question:

BQ25120: BQ25120

BQ25120: BQ25120 Watch Dog Timer Disable

Kami Huang60
Genius 3830 points
Part Number: BQ25120
Other Parts Discussed in Thread: BQ25121A

Dear Sir/Ms.

 My client uses CP2112 to control BQ25120A, and set VSYS_OUT from default 1.8V to 3.3V. After a while, I don't know why he will reply to default value. Later I flipped the datasheet as shown in the following figure. When using I2C interface, The watchdog timer will start, and after 50 seconds, it will return to default. Later, the measured results were indeed 50 seconds. What is the use of this mechanism? How to turn off this mechanism? Can I disable Watch Dog Timer?

 Best Regards,

 

Kami Huang

  • 0
    TI__Genius 12485 points

    Kami,

    That is correct. The goal of the watchdog is to return the device into default "safe" settings in the event of an MCU crash. 

    The watchdog timer cannot be disabled on the BQ25120A. I would recommend to switch to BQ25121A which has the watchdog timer disabled by default. 

    Also note that the watchdog will run when adapter is present or /CD pin is high. On battery only mode, you can lower /CD pin to not have watchdog clear the registers. To satisfy watchdog on the BQ25120A, you will need to communicate with the IC atleast once every 30s or so. 

    BQ25121A has watchdog disabled at all times. 

    Regards,

    Gautham