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BQ76952EVM: The shutdown command is sent twice and still cannot be shut down and Pressing the reset button for a short time cannot wake up deepsleep mode

Jiahui Gao
Expert 7000 points
Part Number: BQ76952EVM
Other Parts Discussed in Thread: BQ76952

Hi，

      We encountered two problems when using BQ76952EVM.

     a) bqsbb after the upper computer sends the shutdown() command_ When CMD is set, FET can be closed normally, but bq76952 does not enter shutdown and can continue communication. Reg1 can output 3.3V. It is found that the voltage of TS2 is 0.1V and the resistance of TS2 to GNG is 7.8M

     b）After sending deepsleep() command, pressing reset button for a short time cannot wake up DEEPSLEEP mode. After briefly pressing the key, the upper computer still displays DEEPSLEEP set and sends exit_ deepsleep() can exit DEEPSLEEP mode. No current enters SLEEP mode, SLEEP is set, and SLEEP is cleared by short pressing the key.

     We look forward to your reply! Thanks!

  • 0
    TI__Guru* 81034 points

    Hi Jiahui,

    It looks like the device is not entering Shutdown if REG1 is still showing 3.3V and TS2 is low. If the device is SEALED, then the Shutdown command must be sent twice within a short time to be effective. Sending the Shutdown command twice also allows the Shutdown Command Delay to be skipped in UNSEALED mode.

    In DEEPSLEEP mode, the I2C of the device is still active. You can send the EXIT_DEEPSLEEP() command to exit this mode. If you are using the RST_SHUT pin to exit this mode, make sure this pin has a voltage reference. For example, if you are using REG1 as the voltage for RST_SHUT, your REG1 might be powered off in DEEPSLEEP mode unless you have programmed the DPSLP_LDO bit.

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Prodigy 10 points

    Hi Matt,

    a) The device is in FULLACCESS mode. sends shutdown() command SD_CMD is set, FET can be closed normally. I guess the device entered the "soft shutdown" state because TS2 PIN voltage is below VWAKEONTS2. But I don't know why TS2 pin voltage is lower than VWAKEONTS2? Is BQ76952 damaged? I didn't change the peripheral circuits.

    b) You are right. In DEEPSLEEP mode, REG1 is off, so the button cannot wake up. Thank you!

  • 0 in reply to Yao Ying
    TI__Guru* 81034 points

    Hi Yao,

    It does not sound like the device was in "soft shutdown" if the REG1 was still showing 3.3V. 

    Best regards,

    Matt