BQ27421-G1: Possible discrepancy in IC's datasheet with TOGGLE_GPOUT (0x0023)

Michael Nikonov

Part Number: BQ27421-G1
Other Parts Discussed in Thread: BQSTUDIO, BQ27621-G1

I believe I've found mistake in IC's datasheet : https://www.ti.com/store/ti/en/p/product/?p=BQ27421YZFR-G1B RevE .

On page 11 , Table 2 , there is statement that Command TOGGLE_GPOUT (0x0023) is accessible when device is in SEALED.From this, I understood that TOGGLE_GPOUT could be applied when CONTROL_STATUS [SS] = '1' .

But in practice , the command TOGGLE_GPOUT(0x0023) accessible when device is UNSEALED i.e. CONTROL_STATUS [SS] = '0'

Later , this fact also confirmed with bqStudio : ,

when I tried understand why GPOUT is not toggled as expected .

For misunderstanding avoidance : I set opConfig register to 0x05D8 and applied BAT_INSERT: 0x000C command ,before applying TOGGLE_GPOUT .

over 5 years ago

0 Andy Liu (BMS) over 5 years ago

TI__Guru 52115 points

I cannot see the screenshot you posted. Can you upload it again?

In addition, I will check with our firmware team and see if the TOGGLE_GPOUT is available in the SEALED mode.

Andy

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

Prodigy 90 points

Sure ,

Sorry , I thought it will be uploaded later with original post.

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

TI__Guru 52115 points

Which version of bqStudio are you using?

Here is what I see in my bqStudio (v1.3.86).

Andy

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

Prodigy 90 points

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

TI__Guru 52115 points

Here is the bqz file for bq27621-G1 I find on my laptop.

Can you find the same file in the bqStudio installation folder (e.g C:\ti\BatteryManagementStudio\config)?

If so, replace it with the one I provide and check if you can see the same Commands Window as my screenshot shows?

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/0621_5F00_1_5F00_05_2D00_bq27621G1.bqz

Andy

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

Prodigy 90 points

Sorry , my bad .

In topic title I've mentioned BQ27621, but everything I wrote , related to BQ27421 . However , in the first post I referred to the right datasheet.

This could explain difference in bqStudio interface , but not the observation topic itself.

I will be appreciated,if moderators will fix BQ27621 to BQ27421 in this discussion(incl. tags and title)

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

TI__Guru 52115 points

I have fixed the title.

Also, I'm checking with my colleagues about TOGGLE_GPOUT command and will provide my answer this week.

Andy

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

TI__Guru 52115 points

What I have found so far is that the TOGGLE_GPOUT should be only available in the UNSEALED mode.

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

Prodigy 90 points

So , you confirm there is discrepancy among datasheet and hardware ?

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

TI__Guru 52115 points

Yes. That should be a typo.

Andy

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BQ27421-G1: Possible discrepancy in IC's datasheet with TOGGLE_GPOUT (0x0023)