BQ40Z50-R2: Unsealed data flash write access

Nate Enos

Part Number: BQ40Z50-R2

Hi team,

Quick question here. Could you help clarify section 12.5.2 "Sealed to Unsealed" in the BQ40z50-R3 TRM? It states: "In UNSEALED mode, all data, SBS, and DF have read/write access". Which makes it seem like there is no issue to write to data flash in unsealed mode. But then the next sentence states: "Note that although writing to most of the SBS commands are accepted by the gauge, the written data will be immediately overwritten by the gauge and the write action is ignored." This seems to contradict the previous sentence. Can you elaborate on what is ignored and what can be written in unsealed mode? I'd like to very that data flash can be updated in unsealed mode.

Thank you!

Nate

over 5 years ago

0 Andy Liu (BMS) over 5 years ago

TI__Guru 52115 points

Hi Nate,

The data flash can be updated in unsealed mode.

Andy

0 Nate Enos over 5 years ago in reply to Andy Liu (BMS)

TI__Genius 9430 points

Hi Andy,

Thank you for confirming this. Could you help clarify what this sentence is referring to then: "Note that although writing to most of the SBS commands are accepted by the gauge, the written data will be immediately overwritten by the gauge and the write action is ignored." As written, it's a bit confusing.

Thanks!

Nate

0 Andy Liu (BMS) over 5 years ago in reply to Nate Enos

TI__Guru 52115 points

Let me check the firmware code next week and see if I provide the answer.

0 Andy Liu (BMS) over 5 years ago in reply to Andy Liu (BMS)

TI__Guru 52115 points

There is nothing wrong with that sentence.

Most of the SBS commands are read-only. It is okay to write to these SBS commands. However, the written data will be ignored by the gauge.

Andy

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BQ40Z50-R2: Unsealed data flash write access