BQ79616: BQ79616

Hi Ladislav Dreisig

What specific read commands you sent?
This looks like reading a read command for read seven registers.
Can you measure UART or daisy chain with a logic analyzer?

Regards,
Wink

Hi Wink, thank you for your reply.

I am sending the following commands as per the example:
D0 03 4C 00 FC 24

D7 03 43 00 00 00 00 00 00 00 00 00 00 61 6F // I tried without this synchronization

D0 03 09 01 0F 74

D0 03 06 00 CB 44

D0 03 06 01 0A 84

D0 03 08 02 4E E5

90 00 03 08 00 13 DD

90 01 03 08 03 52 20

C0 03 4C 00 F8 E4

Further reading attempts:
- Device 0 query
80 00 05 30 02 A0 1E // error reading + response

- query on Device 1
80 01 05 30 06 A0 21

waveform detail on the link between device 0 and device 1

Device 0 to Device 1

Device 1 to Device 0

Device 1 to Device 0 diferencial

thank you for your reply and your time.

Lada

Hello Lada,

Let me look into these, I will reply by tomorrow. Sorry for the wait!

Best Regards,

Luis Hernandez Salomon

Hello Luis,

I remind myself with my question. I need help with this.
All attempts have the same result. The second component communicates with the first, but the first one does not send me data.

Best Regards

Ladislav Dreisig

Hello Ladislav,

Apologies for the wait. I was unfortunately out of office until yesterday.

You mention that you were not sync'ing, what is your auto-address sequence? Do you have a log of the sequences performed? A logic analyzer capture of the UART lines would be useful. 

I saw that you also mentioned you used capacitive isolation, was this on the same PCB, or different boards? 

Best Regards,

Luis Hernandez Salomon

Hello Luis,
I tried it with and without synchronization. Unfortunately, I do not have a logic analyzer that would translate the communication between two BQ79616 components. There is no classic UART there.

Other communications can be seen in the previously sent pictures. From them, communication between components is also visible, The components have capacitive coupling and are on one PCB. They are 5cm apart.

I am attaching images with communication between two BQ79616. My sent question: 80 01 05 30 06 A0 21 (from address 0x0530 read 7Byte)

yellow signal - query from MSP to BQ79616
blue signal - response from BQ79616 to MSP
red signal - mathematically subtracted two differential signals of communication between BQ79616 and BQ79616

The number of bytes in the response corresponds to 7 byte data and 6 byte header (If there is a similar communication there as on the uart.)

Measured voltage question

Measured voltage answer

Evidently, communication is taking place. If I ask the first component in the sequence about the same thing, they will answer me.

Thank you.

Láďa

Hello Lada,

I am not sure why it is not working.

Mind sending me your schematic? You can send it through Private Messages if you'd prefer. 

Can you measure the timings of the daisy chain waveforms, and compare to what is shown in the following application note:

• BQ79616-Q1 Daisy Chain Communications

This shows the timings required for communications to be successful. 

Have you attempted doing these communications with EVM's? It may be good to test these with EVM's to ensure that it works on a known good board, so we can rule out if it is due to hardware of software.

Best Regards,

Luis Hernandez Salomon

Hello Luis,

Sorry for the delay, but I have more projects. i got around to connecting the second piece of HW and the result is the same.

here is the schematic:

Have you tried any command sequence?

Thank you.

Láďa

Hello Lada,

No worries! I will check the schematic by tomorrow.

Command sequences should work fine with your device, I have used it many times in the past with no problem.

Best Regards,

Luis Hernandez Salomon

Hello Luis,

So I checked the communication. On the second BQ79616 I have a diode on GPIO3 and I turned it on. So the data is passing through. But the response still doesn't get through the first BQ79616 to the processor.

Don't I have to make a command to switch from setup to normal operation?

Thank you.

Láďa

Hello Lada,

The daisy chain circuit looks okay to me.

My only guess here is that the devices may have not been properly auto addressed. Do you have a log of exactly what sequence is being sent for the auto address sequence here?

Best Regards,

Luis Hernandez Salomon

Hello Luis,

sequence is this:

1) SYNC from D0 03 43 00 F9 D4 to D0 03 4A 00 FF 84
2) D0 03 09 01 0F 74
3) D0 03 06 00 CB 44
4) D0 03 06 01 0A 84
5) D0 03 08 02 4E E5
6) 90 00 03 08 00 13 DD
7) 90 01 03 08 03 52 20
8) SYNC from C0 03 43 00 FD 14 to  C0 03 4A 00 FB 44
9) 90 01 00 0F 04 E1 D2 - successful lighting of the LED on the second BQ79616
10) 91 00 03 31 FF FF 4C A1 - null FAULT_RST1 and FAULT_RST2
11) 80 00 05 2D 01 E9 4F - read FAULT_SUMMARY first BQ79616 (response 01 00 05 2D 00 00 91 0F)
12) 80 00 05 52 02 89 7E - read FAULT_PWR1  first BQ79616 (response 02 00 05 52 00 00 00 E4 78)
13) 80 01 05 52 02 88 82 - read FAULT_PWR1  second BQ79616 (see picture)

Thank you.

Láďa

Hello Lada,

When you do broadcast reads, are you able to properly read the device? Is there any response there?

Do you have an EVM? Or are you able to use our GUI using an USB2ANY? Wondering if sending the command sequence through it may help.

The command sequence you shared looks okay to me in terms of the commands being sent. Did you confirm that the CRC was properly generated for each step?

Very odd that there is no response returned. Apologies about the difficulties here. 

By the way, have you tried replacing the IC's to see if it is possibly a faulty IC?

Best Regards,

Luis Hernandez Salomon

Hello Luis,

The response is if I query only the first BQ79616.
The second one just executes commands and sends responses to the first one.
We have two boards made and both behave the same.
The CRC calculation function works correctly, I checked the results with sample examples and the first BQ79616 works normally, except for forwarding responses from the second BQ79616.
I will try to somehow connect your interface to our board.
Unfortunately, I'm probably doing something non-standard, but it's strange that the first BQ79616 processes my query, sends it to the second BQ79616, processes it as well, replies and the last step doesn't happen.

Best Regards

Láďa

Hello Luis,

I would like the BQAutoEval program to be able to connect via a universal USB to RS232 converter. Is there a way to set this up?

Thank You.

Láďa

Hello Lada,

The engineer is currently Out of Office for today and tomorrow. They will be back Monday to provide a response.

Thank you for your patience.

Best Regards,
Alexis

Hello,

I ordered USB2ANY. After turning it on, the BQAutoEval software finds the USB2ANY converter, but my HW does not. I looked at the TX signal from the USB2ANY converter and there is no signal at all. When trying to communicate, nothing moves on it. It is at logical 0.
Is there something to set or update the FW somewhere?

Thank You.

Best Regards,
Láďa

Hello Luis
I managed to upgrade usb2any to version 3.1.1.14 and everything started working. So I will listen to the settings and communication between QBEval and check the data that I send.

Thank you for your cooperation.

Best regards
Ladislav Dreisig