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BQ76942: Partial reset through RST_SHUT

Adam Andersson
Prodigy 50 points
Part Number: BQ76942

Hi,

I have a question regarding the partial reset through RST_SHUT. Let's say that we lose the communication towards the AFE (if the AFE freezes), would an RST_SHUT be able to revive the communication towards the AFE? Or are there any better solutions that could solve such issue? Generally, when would one like to use the RST_SHUT?

Best regards,
Adam

  • 0
    TI__Expert 8526 points

    Hi Adam,

    Could you clarify what you mean by device "freezing?"  If you are specifically concerned with freezing of communication, the RST_SHUT pin is able to recover communications.

    Section 12.6 RST_SHUT Pin Operation in the BQ769x2 datasheet provides more information on the RST_SHUT performance for partial reset and shutdown.  I will link it here: BQ76952 3-Series to 16-Series High Accuracy Battery Monitor and Protector for Li-Ion, Li-Polymer, and LiFePO4 Battery Packs datasheet (Rev. B) (ti.com).

    • If you are interested in resetting most of the digital logic, including that associated with the serial communications bus, then you should assert the RST_SHUT pin asserted HIGH for < 1 second to perform a partial reset.
    • If you would like to place the device in SHUTDOWN mode, thus disabling external protection FETs, and powering off the internal oscillators, the REG18 LDO, the on-chip preregulator, and the REG1 and REG2 LDOs, then you should assert the RST_SHUT pin for > 1 second.
    • A full reset of the device can only be accomplished by giving a RESET command.

    I hope this helps!

    Best,

    Andria