BQ40Z80: BQ40Z80

Hello Manas,

Can you please get a digital logic capture of the communication you are sending to the gauge. Also ensure that the gauge is properly powered up.

Regards,

Adrian

Hi Adrian,
We don't have that sorry. But is it possible to get a code reference that establishes communication or something similar?

Hello Adrian,
We have gone through the document but didn't find anything related as we could not detect the bqevm itself. Is there something that can be done?

Hello,

Verify that the device is properly powered up and make sure the gauge is waken from sleep or shutdown mode by shorting the BAT and PACK pin and/or applying a voltage on the PACK pin. Hook up a digital logic analyzer on the communication lines to see what's going on.

Regards.

Adrian

Hello Adrian,
Okay will try that.

Hello,

Sounds good. Let me know if you have any further questions.

Regards,

Adrian

Hello,

Tried that it didn't work out. Any other methods?

Are there some configurations which needs to be done in the Bq using Bqstudio before using external host MCU?

Hello,

My only recommendation at this point is to capture waveforms of the communication using a digital logic analyzer as that will greatly help us debug this issue. There does not need to be any special configuration to be made to use the device with an external host MCU

Regards,

Adrian

Hello,

Okay, will let you know if it works out.

Hello,

Sounds good, let me know if you have any further questions.

Regards,

Adrian

Hello Adrian,

The bq40z80 evm doesn't seem to respond or detect in the by studio. I have also connected the battery, as mentioned in the technical reference manual and the additional references. What appears to be wrong?
 

Hello,

Do you have waveforms of the communication lines? When you say don't respond, is there communication NACKs. If so part of the communication does it NACK.

Regards,

Adrian

Hello Adrian,

This is the screenshot of it. No acknowledgment from the device.

 

Hello,

This information tells me very little information. We are going to need to see waveforms to determine if its a communication issue, or if possible the device is damaged.

Regards,

Adrian

Hello, 

Sorry we don't have the setup to view waveforms, we checked the voltage of the communication lines, it is pulled to 3.3V.

Hello,

There is not much more support I can offer without seeing waveforms. So sorry.

Regards,

Adrian

Hello,
What would be the reason behind it, other than the communication waveforms.

Hello,

The communication waveform will help me verify whether communication is being properly sent to the gauge. Thus, if the timing is correct, the correct address is being used and whether the gauge ACK the address or not. If it does not ACK the address then either the gauge is not properly powered up, in shutdown mode, or is defective. If the gauge ACK the address but then NACK any communication after that then it could be an issue with an access to the wrong register or MCU holding the SCL line low. These are my thoughts that can be proved or disproved if I see a waveform. Without a waveform I can only offer my ideas.

Regards,

Adrian

Hello, 

Got it thanks. Will follow it up.

Hello,

I will be awaiting for your response.

Regards,

Adrian