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BQ76952: BQ76952:Unable to enter sleep mode

Part Number: BQ76952
Other Parts Discussed in Thread: EV2400

Hello, Sir.

"I cannot enter sleep mode when using ev2400 to connect to bq76952. My specific situation is as follows:

  1. Currently, my bq76952 is not connected to any battery yet.


  2. My Data Memory configuration is:  
    1.  sleep:
    2. I also  setting the Settings:Configuration:Power Config[WK_SPD_1:0] bit to '00
      '.
    3. I also turned off almost all protection:

    4. I have exported the specific Data Memory configuration with the file name “8.3.sleep”
      8.3.sleep.gg.csv


  3. My bit registers are:



  4. My CC1 Current,Battery Status,Stack Voltage,PACK Pin Voltage,Alarm Raw Status,Alarm Status:

    Data Log
    
    TimeStamp,CC1 Current,Battery Status,Stack Voltage,PACK Pin Voltage,Alarm Raw Status,Alarm Status
    2023-08-03 09:14:50.860,7,0x0184,5612,5698,0x06F3,0x0283
    2023-08-03 09:14:52.511,7,0x0184,5560,5703,0x06F3,0x0283
    2023-08-03 09:14:54.892,0,0x0184,5765,5688,0x06F3,0x0283
    2023-08-03 09:14:56.530,0,0x0184,5759,5729,0x06F3,0x0283
    2023-08-03 09:14:58.915,7,0x0184,5649,5719,0x06F3,0x0283
    2023-08-03 09:15:00.545,0,0x0184,5780,5729,0x06F3,0x0283
    2023-08-03 09:15:02.889,0,0x0184,5765,5724,0x06F3,0x0283
    2023-08-03 09:15:04.540,0,0x0184,5633,5703,0x06F3,0x0283
    2023-08-03 09:15:06.902,7,0x0184,5791,5724,0x06F3,0x0283
    2023-08-03 09:15:08.606,7,0x0184,5649,5698,0x06F3,0x0283
    2023-08-03 09:15:10.938,0,0x0184,5654,5729,0x06F3,0x0283
    2023-08-03 09:15:12.597,0,0x0184,5759,5729,0x06F3,0x0283
    2023-08-03 09:15:14.924,0,0x0184,5770,5729,0x06F3,0x0283
    2023-08-03 09:15:16.644,0,0x0184,5759,5698,0x06F3,0x0283
    2023-08-03 09:15:18.966,0,0x0184,5765,5703,0x06F3,0x0283
    2023-08-03 09:15:20.624,0,0x0184,5759,5734,0x06F3,0x0283
    2023-08-03 09:15:23.020,0,0x0184,5791,5688,0x06F3,0x0283
    2023-08-03 09:15:24.597,7,0x0184,5759,5703,0x06F3,0x0283
    2023-08-03 09:15:27.026,0,0x0184,5765,5734,0x06F3,0x0283
    



  5. At the same time, I noticed something in the TRM manual:
    1. My "CC1" current measurement is now below the current threshold given by "Power:Sleep:Sleep Current"
    2. I turned off the protection function, and now there are no protection failures, which can also be seen in "Alarm Raw Status"
    3. I have disabled the wake-up based on connected charger because I have set the 'Sleep Charger Voltage threshold' to 0
    4. I did not send the 0x009A SLEEP DISABLE() subcommand
    5. For the wake-up method where the current begins to flow, how should "the current begins to flow" be understood, which means that the current of CC1 cannot be changed?

That's all my configuration and questions, I'm confused why I can't go into sleep mode, if you can answer me, it will help me a lot

Please ask Mr.

Thank you very much. Look for positive responses.

Greetings,

DARLUU.

  • Dear Darluu,

    When I tried your .gg file with a 26V supply as the battery and an EVM, the device entered sleep once no current was detected as shown below:

    However, I did notice that on mine, SHUTV wasn't triggered while it was on yours. After checking through the data you sent, it seems your device is powered by a PACK voltage below the Power:Shutdown:Shutdown Stack Voltage limit. This could cause the device to try to enter SHUTDOWN instead of SLEEP. Could you try raising your PACK voltage above 5.8V to something greater than the 6V threshold (maybe 10 or 12V).

    Best,
    Asher Nederveld

  • Dear 

    Thanks for your answer, I successfully entered sleep mode after lowering the Power:Shutdown:Shutdown Stack Voltage,But sometimes my SD_CMD bit will flicker, resulting in unexpected exit from sleep mode, I don't know what is the reason, please help me analyze it, thank you very much!

    Best regards

  • Dear Darluu,

    I'm glad to hear you can enter sleep now. Generally, the SD_CMD should only go high when the device is pending shutdown, be it from a command from an MCU or having the RST_SHUT pin be asserted. Are you seeing any voltage on the RST_SHUT pin?

    Likewise, it's recommended to place a capacitor on both the TS2 pin and RST_SHUT pin to prevent noise from turning the device on accidentally. Can you share your schematic by any chance?

    Best,
    Asher Nederveld