BQ40Z80: BQ40Z80 SMB Nack

Hello Peter,

We usually see this error when a corrupted srec file is programmed onto the gauge. Can you reprogram this gauge with the same firmware to see if it resolves the issue.

Regards,

Nick Richards

Hi Nick,

The system is stuck.

It cannot unseal for reprogramming.

I change IC solve this issue now.

But that's not the correct solution.

I want to know the possible reasons that could be causing this issue.

Please check this issue again.

Thanks!

Regards,

Peter

Hello Peter,

That you for mentioning that the system is stuck. This is hinting to me that it was possible that gauge was in ROM mode. If it is possible to communicate to the gauge, trying using advanced comms and doing a read word of 0x0D, and tell me what value the gauge is reading back.

Regards,

Nick Richards

Hi Nick

Please refer the picture.

Thanks!

.

Regards,

Peter

Hey Peter,

Sorry I should have clarify to do this test with the IC that was showing you issues. I see that this was done on the newly replaced IC.

Regards,

Nick Richards

Hi Nick,

Please check image again.

Thanks!

Regards,

Peter

Hello Peter,

Thank you for sharing that. Let me discuss with the firmware team see exactly what is going on.

Regards,

Nick Richards

Hi Nick

What kind of judgment led your team to think this way?

Regards,

Peter

Hello Peter,

We did analysis on an issue another customer was seeing similar to this recently and this was the conclusion we came to.

Yan Yu Tuan said:

The system is stuck.

This statement you said previously was the exact same behavior the other customer saw.

Regards,

Nick Richards

Hi Nick,

I think ESD can cause IC damage.

However, I encountered a NACK after sealing the BQ40Z80.

If I don't seal it and reprogram the srec, it can return to normal.

So I don't think it's due to ESD.

What do you think?

Hello Peter,

The IC damage could affect the memory section of the IC which then could affect the instruction flash and/or data flash for the gauge.

Regards,

Nick Richards