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BQ76952: Check power on sequence

Emma Wang
Expert 5190 points
Part Number: BQ76952

Hi expert,

My customer used BQ76952 and they want to check power on sequence for the system.

Our current power-on sequence is:

AFE is powered on -> MCU is powered on -> MCU communicates to put AFE into shutdown mode -> Pull TS2 low to wake up AFE -> Send SET_CFGUPDATE for the first time, and you can read it multiple times. Bit0 in BatteryStatus is 1, and you can configure data normally and exit EXIT_CFGUPDATE; when you send the SET_CFGUPDATE command later, you can read that bit0 in BatteryStatus is 0 after multiple reads, and you cannot enter SET_CFGUPDATE mode.
Want to confirm:
1. SET_CFGUPDATE——Is it only valid for the first time, and subsequent configurations need to enter shutdown mode first;
2. When AFE is powered on for the first time, it must enter shutdown first. After waking up, can it be used normally?

BR

Emma

  • 0
    TI__Mastermind 25980 points

    Hi Emma,

    1. The device does not need to enter SHUTDOWN mode before entering CONFIG_UPDATE mode. Exiting from SHUTDOWN mode will cause the device to overwrite the register settings with the defaults or the settings in the OTP.

    2. The device does not need to be put into SHUDDOWN mode on power on, it usually will do so automatically due to the initial power on conditions causing the device to enter SHUTDOWN mode autonomously.

    Are the commands being sent to enter and exit CONFIG_UPDATE mode consistent with the examples provided in Section 3 of the Software Development Guide?

    Regards,

    Max Verboncoeur