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BQ34Z100-G1: Low standby current setting in ship mode

Edward Lee
Intellectual 1655 points
Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQSTUDIO

Hi Team,

    My customer designs the battery pack with our gauge BQ34Z100-G1.

    They would like to know how to set the gauge in ultra low standby current.

     Is setting to full sleep mode the lowest standby current?

Thanks

Sincerely,

Edward

  • 0
    TI__Guru 52115 points

    The bq34z100-g1 device has three power modes: NORMAL mode, SLEEP mode, and FULL SLEEP mode. The FULL SLEEP mode can achieve the lowest power consumption. 

    See Chapter 5 fo bq34z100-g1 TRM for more details.

    Andy

  • 0 in reply to Andy Liu (BMS)
    TI__Intellectual 1655 points

    Dear Andy,

     

       If we want to set bq34z100-g1 into FULL SLEEP mode, we should not only set the corresponding control command but also modify the data flash too?

       That is to set the Full Sleep Wait Time larger than 0. Is this correct?

     

    Thanks

    Sincerely,

    Edward

  • 0 in reply to Edward Lee
    TI__Guru 52115 points
    Yes. The correct parameter is called "FS Wait" in the bqStudio.  By default, it is 0, which means the FULL SLEEP mode is disabled. You need to set it to a non-zero value to enable the FULL SLEEP mode.
    Andy
  • 0 in reply to Andy Liu (BMS)
    TI__Intellectual 1655 points

    Hi Andy,

          Would you mind we ask more questions?

          I tried to list the questions below.

    1. How to disable FULLSLEEP ? Do we have sample codes for reference?

         The customer successfully set FULLSLEEP but they found it cannot be disabled either by bqStudio or I2C command sets from the host IC.

    2. Do we have the sample codes for accessing flash data memory?

          The command sets should be (1) Unseal (2) Change the value of FS Wait (3) Seal

           It is easy to modify through Bqstudio but the customer wants to modify it by their software in linux.

    Thanks

    Sincerely,

    Edward

  • 0 in reply to Edward Lee
    TI__Guru** 105590 points

    Hello Edward,

    As Andy mentioned, when the FS Wait is set to 0 in dataflash the mode should be disabled, you can change the value in the data memory section of bqStudio. If you are trying to implement the commands with an MCU you can use a logic analyzer or scope to check the communication bqStudio does for the commands you have questions about.

    You can also check the app note Gauge Communication: https://www.ti.com/lit/an/slua801/slua801.pdf?ts=1597260360423&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FBQ34Z100-G1

    Which outlines some standard communication in C.

    Sincerely,

    Wyatt Keller 

  • 0 in reply to Wyatt Keller
    TI__Intellectual 1655 points

    Hi Wyatt,

       Thanks for your feedback.

        I can help to scope the commands for the customer.

        There is one more question about "disable FULLSLEEP" command.

         We only can see the "Set_FULLSEELP" command in bqStudio while cannot find the command to disable it.

        Would you kindly to advise?

    Sincerely,

    Edward

  • 0 in reply to Edward Lee
    TI__Guru** 105590 points

    Hello Edward,

    This command should enable the FULLSLEEP functionality, but to see if the gauge has entered that full sleep mode you have to check the current consumption as stated in section 5.3 FULL SLEEP Mode of the TRM.

    It will have to transition from SLEEP mode to FULLSLEEP mode, you should see a decrease in current consumption.

    It doesn't look like there is an easy way to tell if it is enabled or disabled from the registers. If the full sleep wait time is set to 0 it is disabled.

    Sincerely,

    Wyatt Keller