BQ34110EVM-796: UNSEAL Data Flash Process

Adrien Corvasier

Part Number: BQ34110EVM-796
Other Parts Discussed in Thread: BQ34110, BQSTUDIO, EV2400

Hi,

I need some help to use correctly the part number BQ34110. I can easily read the Raw Voltage, Temperature and some other parameters but today i need to unseal the part.

I read the process on the SLUUBF7A datasheet but it seems i don't understand the unseal process.

On the following picture, i try to send the SECURITY_KEYS but i get an error when i try to send the last I2C Frame (MacDataLen - 0x61) and i can't send the Length.

Thank's for your help.

Adrien

over 5 years ago

0 Adrien Corvasier over 5 years ago

Prodigy 40 points

There is the picture :

Sorry

0 Kang Kang over 5 years ago in reply to Adrien Corvasier

TI__Mastermind 24870 points

Hello Adrien,

I cannot see the picture.

Can you capture a bqStudio unseal process?

0 Adrien Corvasier over 5 years ago in reply to Kang Kang

Prodigy 40 points

Here is the upload of the picture.

I don't use bqStudio because i would like to work with the BQ34110 associated with an MCU.

0 Kang Kang over 5 years ago in reply to Adrien Corvasier

TI__Mastermind 24870 points

Hello,

So your unseal code is 1234, 5678 in hex right?

Can you try it with bqStudio first to see if it can unseal your system?

0 Adrien Corvasier over 5 years ago in reply to Kang Kang

Prodigy 40 points

My device is sealed (SEC1/SEC0 register = 11). But i never sealed it or it's a mistake.

When i read the SECURITY KEYS register, i read 0x00000000.

I suppose bqStudio works only with the EV2400 and i don't have it.

0 Kang Kang over 5 years ago in reply to Adrien Corvasier

TI__Mastermind 24870 points

Hello Adrien,

You should really order one from the TI eStore.

Did you set your seal keys to all 0x0000?

Sealing the gauge means you sent a command or programmed an srec that was previously sealed. In this case, you most likely sent the seal command 0x30.

This is one of the unseal keys that cannot work and will get rejected by the gauge.

You will read all zeros and gauge will nack in seal mode if you try to access dataflash.

Power management

Power management forum

BQ34110EVM-796: UNSEAL Data Flash Process