BQ27510: Sealing and Unsealing the part

Robert Helvestine

Intellectual 275 points

Part Number: BQ27510
Other Parts Discussed in Thread: BQSTUDIO, ,

How do I put the gauge in Full Access mode? According to the TRM, the default codes are 0x00:

However, the TRM also states that the keys must not be equivalent to control data codes.

There is a control data code 0x0000 (CONTROL_STATUS), so this default key doesn't work to enter the Full Access state. I can't change these keys unless I'm in the Full Access state, so I'm a bit stuck in the Unsealed state for now. Any advice would be appreciated.

over 4 years ago

0 Onyx Ahiakwo over 4 years ago

TI__Guru* 76230 points

Hi Robert

the pictures you attached didn't come through. However, if you are using bqstudio, you just need to click the unseal and full access buttons in the command window.

thanks

Onyx

0 Robert Helvestine over 4 years ago in reply to Onyx Ahiakwo

Intellectual 275 points

Onyx,

Thanks but I'm trying to Seal and Unseal from my MCU firmware, not BQstudio. The images were just portions of the datasheet. From the Unseal state, how do I enter the Full Access state? The default codes (0x00) do not work as they are equivalent to a sub-command.

Thanks,

0 Robert Helvestine over 4 years ago in reply to Robert Helvestine

Intellectual 275 points

Onyx Ahiakwo

According to BQ Studio and my BQ27510EVM, the default sealed to unsealed codes are 36720414 and default unsealed to FA codes are ffffffff.

1. Is this default sealed to unsealed code the same for every BQ27510? It is different than the default shown in the datasheet. I don't want to seal my part (using my MCU firmware), if I can't unseal it.

2. The default unsealed to FA code goes against TI's own statement saying to avoid setting the two 2-byte codes equal.

0 Onyx Ahiakwo over 4 years ago in reply to Robert Helvestine

TI__Guru* 76230 points

Hi Robert

1. Yes the default is the same accross all chips except you change it.

2. Setting both the unseal and full access codes to be the same is what that statement means.

thanks

Onyx

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BQ27510: Sealing and Unsealing the part