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How to reset bq27541 to manufacturing default if it is sealed ?

CHAD55252
Prodigy 90 points
Other Parts Discussed in Thread: BQ27541

All,

When I sealed my bq27541 IC, there must have been a typo in it. Because now I can't unseal it

using the key that I've always used to seal and unseal. This key should never change.

Is there any procedure that I can reset the IC to factory default condition ? I don't mind even if it erases

all the data flash data. I just need to regain access to it.

 

I tried to use the firmware update procedure, but it does not work. Gives me "Error 722".

Any advise or suggestion is appreciated. If there is simply no way, please let me know.

Then all I need to do is to dig through the epoxy material, retrive the board, remove IC, solder new IC..and..., errrr !

I hope there is a way !!

 

Thanks,

Chad

  • 0
    TI__Expert 4050 points

    Chad,

     

    Please try to unseal with default key and if the key is changed and you can not remember it  i am afraid that the IC has to be repalced. There is no way to get the device back even with reset.

     

    To unseal put 0x0414 and 0x3672 into the control register. 

    Thanks

    Ming

  • 0 in reply to Ming Yu
    Prodigy 90 points

    Ming,

     

    The default key actually works !! I didn't even think of it because I was so sure I changed

    the security key. I don't know how this happened.  

    Anyway, thanks a lot. Now I don't have to go around the world just to replace the IC.

    And I also learned there is NO way to recover a sealed IC.

     

    Much Thanks,

    Chad

  • 0 in reply to CHAD55252
    Prodigy 20 points

    hi

    i am using this ic for battery management .so far i am able to read the data flash.but i cannot write the locations.i found out that my ic is sealed.how can i unseal it.please give me the sequence of address and data that is to be transferred to the ic to unseal the ic through software.i donnot want to remove it from the board i have already soldered it to my pcb.please help. you can also email me at harshada.s.jawale@gmail.com.i know that we haveto send the unseal key to the ic but how do i write to a sealed ic.when i read the location 00 i get 0x60 and 0x40 in reply to my i2c query.meaning my ic is sealed and is not in full acess sealed mode.how do i unseal my ic and switch over to full access mode.how do i send unlock keys through control command to the ic.please specify the sequence of start bit,address ,data and ack/nack recieved and the stop bit

    thanks a ton

    harshada

  • 0 in reply to harshada jawale
    TI__Genius 14985 points

    3173.How to SEAL and UNSEAL.ppt

     

    I've attached a powerpoint file showing the seal and unseal procedure using EVSW.  You can see the data which needs to be sent to the Control() command to unseal the device if your gauge was sealed with the default keys.  You should be able to determine the exact I2C sequence from this information.