CCS/BQ27510-G3: BQ27510 : WRONG SOC DATA

Amine MAGHREBI

Part Number: BQ27510-G3
Other Parts Discussed in Thread: BQ27510, BQ27441-G1, MSP430G2553, BQSTUDIO

Tool/software: Code Composer Studio

Hello TI team,

I'm using the fuel gauge BQ27510-G3 on my project to read the SOC of my battery Li-Po 1200mAh.

I success to read from the BQ but my problem is the soc always equal to 100% (I think it's a default value from the BQ) and the Design capacity equal to 1000mAh.

By the way the current voltage value is correct (equal to 3.7).

Now my questions is :

1- The BQ27510-G3 need any configuration before start working ??

2- What is the difference between LSB command and MSB command ? are they return the same value ?

3- How can I do to have a correct SOC value?

Thank you.

over 6 years ago

0 Onyx Ahiakwo over 6 years ago

TI__Guru* 76230 points

I will look into your question and get back to you tomorrow.
thanks
Onyx

0 Amine MAGHREBI over 6 years ago in reply to Onyx Ahiakwo

Intellectual 945 points

Hi Onyx,

Ok , I'm waiting your answers.

Thank you.

0 Onyx Ahiakwo over 6 years ago in reply to Amine MAGHREBI

TI__Guru* 76230 points

Hi Amine

The bq27510 is not a plug and play device. There are certain procedures that you have to follow before it can properly report SOC. I have attached an app note that describes what you need to do to get the device functional. Although written for a different device, it is applicable to this device

www.ti.com/.../slua902

thanks

Onyx

0 Amine MAGHREBI over 6 years ago in reply to Onyx Ahiakwo

Intellectual 945 points

Hello Onyx,

Thank you for your responce. But with an old project, I work with BQ27441-G1 , it work fine without any configurations and the SOC return a correct value.

So I have a main question : Is there any difference between the BQ27510-G3 and the BQ27441-G1 (I ask for only configuration need) ??

Thank you.

0 Onyx Ahiakwo over 6 years ago in reply to Amine MAGHREBI

TI__Guru* 76230 points

Amine,
Yes there is a major difference. The default chem id which the gauges use are different. The bq27741 is a ROM gauge and was designed as a one-size-fits-all with minimal configurations. The bq27510 does not work that way and needs proper configuration to be functional.
thanks
Onyx

0 Amine MAGHREBI over 6 years ago in reply to Onyx Ahiakwo

Intellectual 945 points

Thank you Onyx for those informations.
Just one last question , now the BQ27510-G3 is integrated into my own PCB.
can I found a solution to configure the BQ into my own pcb for example with the host MCU(MSP430G2553) via BQstudio ?
If No, should I configure every single BQ27510 alone then put it into my PCB ?!!!

I will be very grateful if you help me to clarify this idea.

0 Onyx Ahiakwo over 6 years ago in reply to Amine MAGHREBI

TI__Guru* 76230 points

Hi Amine
You configure just one device using bqstudio and extract a golden flash stream file which will be used to program multiple units using your host controller.

thanks
Onyx

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CCS/BQ27510-G3: BQ27510 : WRONG SOC DATA