BQ27441-G1: Unable to change security codes

Roberto Flores

Part Number: BQ27441-G1

Hello I'm able to write on any other data memory locations, however I can't do so for security codes subclass. I have tried to write two equal 16-bits operations and as a single 32-bit operation. but nothing is done in both scenarios, reading it again it always returns the default value. The device is unsealed and CFGUPMODE is set.

Is there anything else I have to do to write on that memory location?

Thanks in advance

over 5 years ago

0 Onyx Ahiakwo over 5 years ago

TI__Guru* 76230 points

Hi Roberto

Are you following instructions as described in section 3.2 of the TRM?

thanks

Onyx

0 Roberto Flores over 5 years ago in reply to Onyx Ahiakwo

Prodigy 20 points

Hello, Thanks for your reply.
I did follow those steps and I'm able to write other parameters such as terminate voltage and design capacity, etc. However the only one I'm not able to modify is the security codes. I tried different values, but it never changes. I tried writing them in a single operation (4 bytes) and even separated ( 2 write operations of 2 bytes each), I tried writing 2 equal keys and even tried writing them being both different.
I thought it could be how the checksum is calculated (I'm using the same method suggested in the section you mentioned) but it works for any other location.

0 Onyx Ahiakwo over 5 years ago in reply to Roberto Flores

TI__Guru* 76230 points

we will look into this and get back to you
thanks
Onyx

0 Dominik Hartl11 over 5 years ago in reply to Roberto Flores

TI__Guru 51366 points

Hello,

Unfortunately, the security data class cannot be changed with the regular data update procedure with this particular gauge (bq27441-G1). The TRM does not describe this data class accurately.

Power management

Power management forum

BQ27441-G1: Unable to change security codes