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BQ769x0 XREADY trigger

Victor Chen_HK
Expert 5130 points

Hello Team,

A question from my customer:

What kind of device fault will trigger the DEVICE_XREADY set and when will the fault happen?

From the description in BQ769x0 data sheet, it seems user needs to continuously monitor the status of DEVICE_XREADY.

DEVICE_XREADY (Bit 5): Internal chip fault indicator. When this bit is set to 1, it should be cleared by the host. May be set due to excessive system transients. This bit may only be cleared (and not set) by the host.
0 = Device is OK.
1 = Internal chip fault detected, recommend that host microcontroller clear this bit after waiting a few seconds. Remains latched high until cleared by the host.

Besides, why it is needed to wait for a few seconds before clearing this bit?

Best regards,

Victor

  • 0
    TI__Expert 6085 points

    Hi Victor,

    typically the DEVICE_XREADY is set due to the one of the upper cell's supply voltage is below Vshut. Reset by raising all cell voltages above the Vporz level.

    Also check the CAP1, CAP2, CAP3 voltage levels to where the problem is occurring.

  • 0 in reply to Vish Nadarajah
    TI__Expert 5130 points
    Hi Vish,

    Thanks a lot for your reply.
    From the data sheet, XREADY is described as 'internal logic “watchdog”-style device fault' which can be clear by host MCU. What you said seems related to external hardware such as supply voltage, which seems out of MCU's control.

    Best regards,
    Victor