BQ27Z561EVM-011: Configuration for BQ27Z561 GG

chad pham

Part Number: BQ27Z561EVM-011
Other Parts Discussed in Thread: BQ27Z561, BQSTUDIO, GPCCHEM

Tool/software:

Hi all,

I am at the dead end and I don't know where to turn or what can I do next.

Everything is starting with my system is using 10AH, 3.7V battery, and this battery is out of ordinary. I get recommend to use BQ27Z561 GG to support the battery this size.

I collected the data, and submitted to TI and get back the report that recommend to use chemID = 0x3142.

My GG is by default has this chemID so I don't do anything but adjust the Design's settings.

I am using bqStudio for my data collection and it took 96 hours to charge up to 85% and in normal discharge, it shows 3736mV with 62%

1. I don't know which parameters dictate this percentages, but it seems wrong because in my settings, I set 100% at 4100mV and Term Voltage at 3400mV; hence my percentage should reflect differently.

2. is there any additional service from TI for us to get the correct chemID for particular battery?

3. Even the chemID is not exactly fit, can my BQ27Z561 still relatedly reliable report the SOC?

2 months ago

0 Adrian 2 months ago

TI__Mastermind 37761 points

Hello Chad,

Can you send me the report from the GPCCHEM tool that showed the matching ChemIDs. I want to ensure that the process was done correctly.

Regards,

Adrian

0 chad pham 2 months ago in reply to Adrian

Prodigy 145 points

4276.10Ah_Capture-report.zip

Hi Adrian,

this is the report back from TI. Funny thing when I reached out again with the community about why the report didn't have any information regarding my battery gas gauge selection BQ27Z561. I got the suggestion that the recommendation ID is 3241. I am completely lost.

0 Adrian 2 months ago in reply to chad pham

TI__Mastermind 37761 points

Hello Chad,

Do you still have the data the was submitted to the GPCCHEM tool. I want to confirm the test was done successfully first as we expect there to be multiple battery chemistries listed.

Regards,

Adrian

0 chad pham 2 months ago in reply to Adrian

Prodigy 145 points

10Ah_Capture.zip

Hi Adrian,

Here is data package I used to submit to the GPCCHEM tool. While the report provide multiple chemID, but non of the GG suggested was useful for me because it didn't list the chemID or even suggestion the related GG as close for my GG, BQ27Z561.

0 Adrian 2 months ago in reply to chad pham

TI__Mastermind 37761 points

Hello Chad,

The process looks to be done correctly. We recommend the ChemID to be less than 3% however the current ChemID can be used if you don't need the best accuracy from our gauge. The next step is to complete the learning cycle on the gauge.

www.tij.co.jp/.../slua903.pdf

Regards,

Adrian

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BQ27Z561EVM-011: Configuration for BQ27Z561 GG