BQ33100: P-FET is always OFF when system is powered

Hello Wyatt,

Thank you for the explanation.

I applied BQ33100 to monitor the charge of 5 pcs 100F super capacitor series module, the charger is BQ24640. And we will purchase the EV2400 to debug issues.

TKS.

Hello Len,

Once you have evaluation software running with the EV2400 we will be able to see any possible protections being triggered and adjust the parameters for your application.

Sincerely,

Wyatt Keller

Hello Wyatt,

We use EV2400 with bq Evaluation Software to debug the BQ33100. There is a problem that the BQEVSF tool cannot successfully recognize the EV2400 when using the EV2400 fixture. How can I troubleshoot this exception?

1. BQEVSF tool cannot successfully recognize EV2400, error code: 2

Method 1: Upgrade EV2400 FW to V0.28, which has been completed, but the error cannot be resolved.
Method 2: Update EV2400_Support_Components_20110524.exe, which has been completed, but the error still cannot be resolved (the tool still only recognizes EV2300).
The detailed pictures are as follows:

Hello Len,

Let me check with someone else on the team more familiar with this software.

Sincerely,

Wyatt Keller

Hello Len,

Are you running the software as administrator? I would also check to see if bqStudio can communicate with the EV2400 in case there is an issue with the EV2400 itself.

Sincerely,

Wyatt Keller

Hi Wyatt,

I running the software as administrator can detect device, TKS.

Now, I can read the messages of SBS & Data Flash.

But, the CHG signal is always high, the PMOS cannot be automatically turned on to charge Super Cap.

I tried to use the FETControl (0x46) function to force the PMOS to be turned on for charging.

The test results showed that the PMOS can be forcibly turned on, and the super capacitor is charged normally.

Confirm that the hardware circuit design should be correct.

 How can I adjust the firmware to make the chg function work normally??

1.How to set the parameters to turn on PMOS normally?

2.What conditions must be met for PMOS to turn on?

Hello Len,

Great I'm glad you have the program working.

I think the pictures you tried to upload didn't populate correctly.

Some of the protections may be causing the firmware to keep the FET off which is why you can manually set the FET.

The EVM Users guide is a good reference for using the software and how to calibrate/setup the manager: www.ti.com/.../sluu466.pdf

Sincerely,

Wyatt Keller

Hi Wyatt,

Update the image file as follows:

I read the messages of SBS & Data Flash.

According to the description in the FET ACTION chapter, if there is any abnormality in the safetystatus status, the charge FET will be turned off; but in the TI bqEVSW tool detects, the safetystatus is all green, and no detection is high.

But, the CHG signal is always high, the PMOS cannot be automatically turned on to charge Super Cap.

How can I adjust the firmware to make the chg function work normally??

1.How to set the parameters to turn on PMOS normally?

2.What conditions must be met for PMOS to turn on?

Hi Wyatt,

Do you have SLUA336B technical documents?

Hello Wyatt,

I dump the .senc file from BQ33100-EVM-001, and then I am programming it in my board. It is workable. The PMOS can be automatically turned on to charge Super Cap.

Thanks~

Hello Len,

Great, I'm glad you got it working. How did you resolve the issue, did uploading the .senc to your board fix the issue?

Sincerely,

Wyatt Keller

Hello Wyatt,

Yes, I just updated the .senc file from the IC on the BQ33100-EVM-001 board to my project, The PMOS can be automatically turned on to charge Super Cap on my project.