BQ40Z50-R2: BQ40z50 R2

Hi Nick,
Thanks for your reply.

But this command doesn't work in sealed condition and looks like the battery is in sealed mode. How can I unseal?

Here is the current register status

Regards,

Sadatan

I tried Unseal command but it is asking for correct secure pin. I tried using default pin but it is not working. And Iam unable to read the pin using 0x0035 command. May be Iam doing some thing wrong. Can you suggest correct method to know secure pin and Unseal the pack 

I tried Unseal command but it is asking for correct secure pin. I tried using default pin but it is not working. And Iam unable to read the pin using 0x0035 command. May be Iam doing some thing wrong. Can you suggest correct method to know secure pin and Unseal the pack 

Hey Sadatan,

Make sure to turn off auto refresh before sending the UNSEAL command.  

Regards,

Nick Richards

Hi Nick

That is off. Do you think I can read the secure key using advanced  comm commsnds. Can you tell me the sequence 

Regards,

Sadatan 

Hello Sadatan,

For security reasons, you can not read the seal keys using advanced comms. It seems that the keys were changed from the default values. Since that is the case, there is nothing I can do.

Regards,

Nick Richards

But as per the technical reference manual, it is given that we can read the Unseal key using 0x0035 command as given in snapshot below:

or does it imply something else.

Regards,

Sadatan

Hi Nick,
On the basis of this register status, do you think it is recoverable. As "PF" bit of Operation Status register and "SOCC" bit of PF Status Register are set? Do you think it shows permanent fuse blown or is it temporary Flag got Set?

Regards,

Sadatan

Hey Sadatan,

I believe this should be recoverable. I am currently looking if there are other ways of recovering the gauge when the gauge is sealed.

Regards,

Nick Richards

Hi Nick,

Any update on this?

Regards,

Sadatan

Hi Nick,

So, you are saying that by using PF_CLEAR command, we can recover the battery pack even if PF bit of "Operation Status "Register and SOCC bit of "PF Staus" Register are Set? Do you think this is case of internal Fuse getting blown or just power path MOSFET or Fuse getting disabled by BMS chip ? 

Will I be able to recover the battery pack by unsealing and using PF_CLEAR command from BQstudio? Because as per the definition of PF, it is permanent failure.

Regards,

Sadatan