BQ41Z90: FW is not program and bqstudio SMB is not connect with EV2400

Hello HJ_KIM,

The biggest reasoning behind the EVM not working is due to not shorting the leftover voltages taps, from the picture I can't tell how many cells in series is the pack but please follow the image below in the EVM.

EVM:
https://www.ti.com/lit/ug/sluud64/sluud64.pdf?ts=1743606829119&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FBQ41Z90

Thank you,
Alan 

Hello.
As you said, I did short between cells, but it doesn't get the same progarm. Even the D6 LED won't turn on when I connect it like this.
Please check if the connection in the attached picture is correct.
And the problem is that SMB communication and PROGRAM won't work. Is there a way to do communication and PROGRAM using external power without connecting the battery?
Anyway, the current problem is that the programming tap disappears when the BQSTUDIO forced execution -> PROGRAM button is pressed. Please guide me on how to solve it.

Hello HJ_KIM,

Please refer to this step below.

EVM:
https://www.ti.com/lit/ug/sluud63/sluud63.pdf?ts=1743717852091&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FBQ41Z90

Thank you,
Alan

Hello.
I proceeded with the content you captured, and there is a problem that the programming tap disappears when proceeding with item 5 and there is no communication.
This is what was said from the beginning.
I've already run bqstudio with 4190_02-bq41z90.bqz, and the problem is when I press the program button with bq41z90_v0_02_build_5.sig.enc.bq. Please let me know how to solve this problem.

And please check if there is no problem with the battery connection and short in the picture attached above.

Hello HJ_KIM,

I've received your question and need some time to investigate into the situation.

Thank you,
Alan

Hello HJ_KIM,

I would restarting the process and redo the EVM from the beginning, the programming button shouldn't be disappear on BQStudio and if you could video capture this event to better understand what you are seeing.

EVM:
https://www.ti.com/lit/ug/sluud64/sluud64.pdf?ts=1744053430705&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FBQ41Z90

Design & development >> Software Development >> BQ41Z90-FW — BQ41Z90 device firmware:
https://www.ti.com/product/BQ41Z90

Thank you,
Alan

Hello Alan Frias

I have captured the program execution screen as you requested and attached it. Please analyze it.
Thank you for your active help.

Best regards,

HJ

Hello HJ,

Your question has been received and will be answered promptly.

Thank you,
Alan

Hello Alan

Is there anything confirmed?

Hello HJ_KIM,

After reviewing the video the biggest issue is that your gauge isn't automatically being connected to BQstudio meaning there is a setup issue with your board. Just to confirm for the shorting portion of the voltage taps of the empty spots did you do a solder bridge? In the earlier picture you sent it seemed that is how you shorted the voltage taps.

Thank you,
Alan

Hello Alan

The first photo is J33 and J42 shorted, and the second is shorted directly by Lead wire. I'd appreciate it if you could tell me which one is the right way.
If J33 and J42 are ordered to SHORT as jumpers, please check whether the connected one is SHORT or OPEN one is SHORT.

Thank you

HJ

The latest firmware bundle only includes the .enc.bq.fs file, which is not compatible with EV2400.
Could you please provide an unencrypted .bq.fs file (e.g., bq41z90_v0_01_build_1.bq.fs) that can be used with bqStudio’s Programming tab?

Thank you in advance.

Hello HJ_KIM,

the cell simulator can only be used by itself and not with a cell hooked up with it. If you are hoping to test your cells with it than it would be best to remove the jumpers and solely use the voltage tap connections. Also if you are doing a 4 cells in series connection I've attached a diagram to do so. The ones highlighted orange and green represents the wire connection and yellow highlights means optional wires.

Thank you,
Alan

Hello,

The latest firmware would be founded on the product page under "software development".

Thank you,
Alan 

Hello Alan

Thank you very much for your kind reply.
However, the current problem seems to be a problem with communication regardless of cell connection.
When I connect to the I2C with the EV2400, it seems that I2C communication is available as shown in the attached picture. However, when I tried to program, the message "Program Flashstream: Communication protocol is not supported" appears in the bottom left. I will summarize the questions below.
1. Is it impossible to program with I2C?
2. Why is SMB not communicating?

Hello HJ_KIM,

Give me some time to discuss about this with the 41z50 expert to get back with you on this. Please expect a response either than week or early next week.

Thank you,
Alan

Hello HJ_KIM 

HJ_KIM said:

1. Is it impossible to program with I2C?

Firmware development for bq41z90 is an ongoing process, at the moment the current FW version of BQ41z90 does not support i2c, currently there is no time table for when the next fw update will be released

HJ_KIM said:

2. Why is SMB not communicating?

-This is most likely due to your hardware setup being down incorrectly. Please reference the EVM For help on implanting the battery gauge.

EVM:
https://www.ti.com/lit/ug/sluud64/sluud64.pdf?ts=1745615153865&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FBQ41Z90EVM

Thank you,
Alan