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Original question:

BQ40Z60: Exiting from Emergency Shutdown Mode

BQ40Z80EVM-020: Emergency FET shutdown Manufacture access command

Mohan Raj
Prodigy 200 points
Part Number: BQ40Z80EVM-020
Other Parts Discussed in Thread: BQSTUDIO

Hello Team ,

For my project i need to shudtown and wakeup the BQ controller . For this currently i am using the manufacture access command.

Configured the DA configuration register accordingly.

I have send the 0x270c  and 0x043D   within the 4s duration time . But emergency shutdown is not occurring in the Device. Device is still detected in the BQstudio.

Could you please help me to implement the EMERGENCY FET shutdown through the command.

0x44  0x2 0x0c 0x27   - > 0x270c

0x44  0x2  0x3D  0x04   -> 0x043D

  • 0
    Prodigy 200 points

    Adding one more point also  i am trying from BQstudio this command , any auto refresh command is sending backgroudly from BQ thats why it is not working .. Can u suggest

  • 0 in reply to Mohan Raj
    TI__Guru** 105770 points

    Hello Mohan,

    Please disable the auto-refresh in the top left corner of BQStudio on the main register page there is a green banner which you can click and it will turn red when it is off. It is right above the USB plug image.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 200 points

    Hello  Wyatt,

    u meant to say click this refresh button

  • 0 in reply to Mohan Raj
    Prodigy 200 points

    While clicking this one refreshing the register is happening

  • 0 in reply to Mohan Raj
    Prodigy 200 points

    Hello Wyatt,

    Thanks for your updation , i have changed the setting and trying sending command while i am sending the command through advanced communication tab , EMSHUT bit is not setting in the operation status bit register .But through the inbuilt bqstudio comamnd EMSHUT bit is setting in operation status register but not turn off the bit setted for discharge and charge FET . Both dicharge and chage FET turned on. 

    why it is not properly working in my case please help us.

    but still i have the communication with the BQstudio.Let me know what is the meaning of this  why the BQ studio communication not went off.?

    Why i am sending through command the bit is noty setting?

    How can i measure the emergency shutdown feature ? Could you please help me for further proceeding ?

    Please correct my command.

    ...mfc.gg.csv

  • 0 in reply to Mohan Raj
    Prodigy 200 points

    added this screenshot also for your reference

  • 0 in reply to Mohan Raj
    TI__Guru** 105770 points

    Hello Mohan,

    You have the FET_EN bit cleared, this means the gauge will keep the FETs off unless you toggle them manually. I would enable FET_EN and configure the gauge so the FETs are on, then use the EMSHUT feature to disable the FETs. IF the FETs are already off the only way will be to see the EMSHUT bit. Otherwise you can check the DSG and CHG pins.

    I tested using your command sequence with FET_EN and EMSHUT works as expected using the advanced communication.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 200 points

    Hi Wyatt Keller ,

    Thanks for your reply . I need one clarififcation from your side.

    in EMSHUT feature enable time the FET will off (Charge and discharge ) there is no change in the system , so let me know any power consumption will reduce ? or i want to know the power consumption due to the FET will reduce othere than there is no chnage in the system  am i right ???

    only FET power will reduce means i can turn off each FET by individual command  no need to implement the EMSHUT i think so ?

    Please correct me if my understanding is wrong ?

    the one more question also if we are doing normal shutdown through command  the wakeup is only possible shorting tha pack + and BAT +.

  • 0 in reply to Mohan Raj
    TI__Guru** 105770 points

    Hello Mohan,

    The power consumption by the gauge will be less since the FET charge pumps are not operating, you can find the different power state current values in the datasheet.

    The individual FET controls are not available if the gauge is sealed - so if in your application the pack will remain unsealed you could use the host to turn on and off the FETs. This also means the FET_EN must = 0 to use manual FET control so the firmware will not control the FETs, meaning all FET functions must be done manually.

    Normal shutdown command can only be exited when PACK+ voltage goes above Vstartup. EMSHUT can be turned on and off via command or button.

    Sincerely,

    Wyatt Keller