BQ20Z655: Recovery for Reinsert Battery Pack

Hello Louis,

You will need to make sure your gauge is configured correctly so that it is in a condition to turn the FETs on when a charge or discharge is needed.

Were you able to test your system with the EVM and your gauge configuration to see it's operation is correct?

Sincerely,

Wyatt Keller

Hi Wyatt

I answer the your feedback.

You will need to make sure your gauge is configured correctly so that it is in a condition to turn the FETs on when a charge or discharge is needed.

You asked us to make sure our gauge should be configured correctly.

           Unfortunately, now we are use the device BQ20Z655 first for this time. So we don’t know well which configuration of the gauge you mean.

          If the gauge configuration you said is the hardware schematic, we already referred the reference schematic the TI gave.

          As you can see the schematic you delivered, our schematic is quite similar to the reference one.

          Could you review our schematic if you find something wrong in it?

          Or if the gauge configuration you said means software part, could you explain more detail about that?

          Now we don’t change and use as a default setting for soft register setting.

Were you able to test your system with the EVM and your gauge configuration to see it's operation is correct?

Now we don’t have the EVM and just designed the schematic following the reference schematic in the datasheet.

   We couldn’t buy the EVM because the delivery to late over 20 weeks. So, the buying EVM and trying first with EVM does not meet our development schedule.

Best Regards.

Hello Louis,

Check and make sure the PRES pin is giving the correct signal, should be 1 when battery is there and 0 when battery is out. It seems like there is an issue with the recovery process.

Can you also provide the .GG file for the gauges configuration?

Sincerely,

Wyatt Keller 

Hi Wyatt

It is not tested by GUI, but by the customer's board.

Because of this, the .GG file can't be provided.

we are purchasing EV2400 for testing with GG file.

Additional Question.

1.We searched more information regarding BQ20Z655 through the Support Forums that you given the website link as below.

    And we found information as below :

• To operate the FET, “QMAX” value should write first and then make “IT Enable” activate. (To write a value to the register, it should be in Full Access Mode)

When we read the 0x54 operating status, the value was 0x8044 and FAS was 0. Does it mean the Full Access Mode, right?

2. During checking the datasheet, we found that the writing IT Enable(0x0021) operation forces to operate the Algorithm.

    I wonder whether it is right way to write IT Enable to activate the BMU.

3. Now we are trying to write QMAX, but failed.

Could you let me know in detail how to write a value to EEPROM?

Best regards.

See my comments below

When we read the 0x54 operating status, the value was 0x8044 and FAS was 0. Does it mean the Full Access Mode, right?

[Andy] Yes.

 I wonder whether it is the right way to write IT Enable to activate the BMU.

[Andy] Yes.

Could you let me know in detail how to write a value to EEPROM?

[Andy] I would suggest you use bqEVSW and you can change the QMax in the Data Flash.

Hi Wyatt

I attached the .GG File.

Battery Pack Spec:

 LG : LGDBHG21865

Nominal Capacity: 3000mAh

Continuous Discharge Rating: 20A

Nominal Voltage: 3.6v

4 Series and 2 Parallel

Could you Provide the ,SENC File for LGDBHG21865?

ggfile-200625.zip

Best Regards.

Hello Louis,

Were the other problems with your system resolved from Andy's comments? I am working to get the .SENC file for you.

Sincerely,

Wyatt Keller

Hi Wyatt

I attached block diagram of system.

could you provide the recommendation .gg file?

Best regards

Hello Louis,

You will need to set the configuration of the .gg file for your application and batteries. You can follow the EVM users guide to see how to change the values: https://www.ti.com/lit/ug/sluu697/sluu697.pdf?ts=1593182577037&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FBQ20Z655

What was the recommended chemID for your battery using the GPCCHEM tool?

Sincerely,

Wyatt Keller