BQ40Z50: BQ40Z50-R3 (BQ40Z453-R3)

Hello Jeongwon,

Jeongwon Park said:

    There is only one current sensing resistor, and I would like to know how to separate Cell 1, 2, 3 and how to calculate it and the calculation time.

We do not support calculating with sense resistor on individual cells 

Jeongwon Park said:

2. The number of times I read the current is irregular, can I improve it?

    The actual current is 0 mA, but if you monitor it 0 mA reads -3 mA every few seconds.

The biggest impact for higher accuracies is to follow the calibration application report below.

bq40zxx Manufacture, Production, and Calibration:
https://www.ti.com/lit/an/slua734a/slua734a.pdf?ts=1745262284081&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FBQ40Z50

Thank you,
Alan

Hello, Alan.

Thank you for reply.
In addition to E to E, the contents received by e-mail are as follows.

       -> 2. The number of times I read the current is irregular, can I improve it?
               The actual current is 0 mA, but if you monitor it 0 mA reads -3 mA every few seconds.

               We do not support calculating with sense resistor on individual cells

I ask for a question again.
Our current state is There are two values to read with PC Tool

1) Reading 0x0071 DA Status1 Cell Current 1, 2, 3
     It's actually a discharge current of -1 to -7 mA
     Current 1, 2, 3 being read are read from -1 to 6 mA.

2) It's actually a discharge current of -1 to -7 mA
     Read the 0x0A Current, the Current looks from 0 to -3 mA.
     Is it correct to read the average current and come out a little less?

3) I understand the calibration of (0x0071 DA Status1) Cell currents 1, 2, 3.
    So why is calibration showing numbers for what purpose?
    What kind of situation should I look at to refer to?
    Or I can't look at it?

Please explain this question in detail. There are several people watching, but no one understands it due to lack of explanation.

Hello Jeongwon,

Jeongwon Park said:

Our current state is There are two values to read with PC Tool

-After communicating with the team there was a error on my end, you can read the individual cell current through the manufacture commands listed below.

Jeongwon Park said:

1) Reading 0x0071 DA Status1 Cell Current 1, 2, 3
     It's actually a discharge current of -1 to -7 mA
     Current 1, 2, 3 being read are read from -1 to 6 mA.

-Are you able to test with a different set of cells to verified that it is not a calibrating or gauge issue? Also could you send a .log file to see other parameters during this time

Jeongwon Park said:

3) I understand the calibration of (0x0071 DA Status1) Cell currents 1, 2, 3.
    So why is calibration showing numbers for what purpose?

-can you attached a screenshot of you are referring too? Or is this the Cell Current 1,2,3 ? 

Thank you,
Alan

Hello, Alan.

Thank you for reply.

1) Please check the attached file you checked.
3) Yes. Cell current 1, 2, 3.

Cell Current issue 250509.pptx

Have a good day.

Hello Jeongwon,

I need confirmation that the gauge is calibrated according to the datasheet below, this situation could be fixed if that is the case 

bq40zxx Manufacture, Production, and Calibration:
https://www.ti.com/lit/an/slua734a/slua734a.pdf?ts=1745262284081&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FBQ40Z50

Jeongwon Park said:

Cell Current issue 250509.pptx

-Thank you for the files, but we need a exported .log file from bqstuido to help debug to look at all the registers during these events. Also also perform the same test on a EVM to confirm it is not a hardware issue on your PCB.

Thank you,
Alan