BQ24105: A battery that has been blocked cannot be recharged.

Hello Yongkyu,

I have a few questions:

What is the status of the Stat pins and PG in?

If you disconnect and reconnect the battery to same board is charging enabled?

Best Regards,

Christian.

Hi Christian

Thank you for response.

The waveform is below:

1. Status 1 on PIN2

2. Status 2 on PIN19

And when I disconnect and reconnect the battery to same board, Charging dose not work.

But if you connect it to other board, It works normally.

Thanks.

YongKyu Joo

Hello Yongkyu,

I'm looking into this issue. I will provide an update after I gather more information.

Best Regards,

Christian.

Hello Christian

Thank you for your kind feedback.

I hope you can tell me how to solve it.

Have a nice day!!

Best Regards

YongKyu Joo

Hello Yougkyu,

Do you have the status of the PG signal?

Best Regards,

Christian.

Hi Christian

The state of PG has been Low from the beginning.

Best regards.

YongKyu Joo

Hello Youngkyu,

Based on the given information this seems to be a battery over discharge issue. What is the battery voltage when you try to start recharge?

Best Regards,

Christian.

Hello Christian

I use Li-ion, 3cell, 2,500mAh.

It's nominal voltage is 12.6V.

When it falls below about 9V, the PCM circuit cuts off the output.

At this time, the battery voltage seen in the charging circuit is 0V.

However, the actual voltage of the battery pack connected to

the PCM circuit is approximately 8.xx V.

It is currently being tested in this state.

- battery pack connected to the PCM circuit : 8.xx V

- out of PCM circuit : 0.00V(the battery voltage seen in the charging circuit)

Best regards.

YongKyu Joo

Hello Yongkyu,

Thank you for this information, I have to review this information, but will give you an update after I do more research.

Best Regards,

Christian.

Hello Yongkyu,

What is the voltage on the FB pin?

I'm confused on the schematic where are you measuring the voltage at 0V and where are you measuring the voltage at 8.xxV

Do you have a seperate PCM circuit?

Best Regards,

Christian.

Hi Christian,

I was confused about "packs" and "cells".

I would like to summarize and talk about those two things again.

I use Li-ion, 3cell, 2,500mAh.

It's nominal voltage is 12.6V.(J1)

When it falls below about 9V(J1), the PCM circuit cuts off the output.

At this time, the battery voltage seen in the charging circuit is 0V.(J1)

However, the actual voltage of the 3-cell battery connected to

the PCM circuit is approximately 8.xx V.

It is currently being tested in this state.

- battery pack connected to the PCM circuit : 8.xx V

- out of PCM circuit : 0.00V(the battery voltage seen in the charging circuit)

I will measure the FB voltage and report back to you. It may take some time.

Thank you

Best Regards

YongKyu.

Hello Christian,

I check FB voltage signal.

Please review.

thanks.

Best regards

Yongkyu.

Hello Yongkyu,

This waveform doesn't look right, It should be a straight DC signal?

Do you see this same waveform before you recharge?

Do you see this same waveform on the good unit?

Best Regards,

Christian

Hello Christian

Did you have good weekend?

We are now talking about a circuit in which a battery

that has stopped discharging will not resume charging.

In normal equipment, it is correct that it is a DC signal.

However, we are now inquiring about the problematic equipment,

and in the problematic equipment, FB appears like that waveform.

This is because the charging current flows for a certain period of time

and then stops repeatedly.

Please review.

thanks.

Best regards

Yongkyu.

Hello Yongkyu,

On the non-working board, if you toggle the CE pin or perform a power on reset, does this resolve the recharge issue?

Best Regards,

Christian.

Hello Christian

On the non-working board, CE pin tied GND.

When Power on reset, this issue does not resolve.

So I asked.

How can I solve it?

Best Regards

Yongkyu

Hello Yongkyu,

YONGKYU JOO said:

So I asked.

How can I solve it?

I understand, I haven't seen this issue before. So I'm looking at all possibilities.

On the working board, is the PCM outputting 0V or 8.xx?

Do you see any noticeable differences between theses two boards?

What is the voltage on SNS and BAT Pin of the working and nonworking EVM?

Best Regards,

Christian.