LMK04033BEVAL: USB2ANY uWire communication issues

Hi Nicholas,

First, you said that you are using the micro wire interface. To clarify, does that mean you're using the USB2ANY-uWIRE bridge adapter? Or are you directly connecting the USB2ANY to the EVM uWIRE header? uWIRE and USB2ANY have different pinouts, so unless you're using the USB2ANY-uWIRE bridge adapter and correctly setting the jumpers on the board to match the required LMK04033 configuration, you could be routing things like the USB2ANY ground pin to the wrong locations, which might cause damage to the USB2ANY.

Do you know if the USB2ANY is still functioning? You could check for active signals on the pins by attempting some register write with the USB2ANY disconnected from the EVM.

For my reference, what are you using the LMK04033 for? LMK04033 is one of our older PLLs, so we don't see it much today except for legacy support.

Regards,

They are using the USB2ANY-uwire bridge. The USB2Any appears to be operational.

Are there other debug steps we could investigate? On the software side, is there any compatibility issues running this on Windows 10?

Thanks,
Nick

Hello Nick,

There shouldn't be an issue with running on Windows 10.

Can you confirm the USB2ANY-uWIRE bridge board settings they are using? I'm attaching a screenshot from the TICSPro GUI for the LMK04033B.

Thanks,

Vibhu

Hello Vibhu,

I can confirm I used the setting in the latest document I have.

You see my boxes have been communicating. The deal is they stop for no apparent reason.  After that they are dead for talking with the chip, they still communicate with the host computer program.

Nick

Hello Nick,

What is the latest document? What are you referring to? I want to make sure that your setup matches the picture above.

Are you looking at the adapter board table on the last page of SNAU045B?

Can you confirm that the adapter board is setup as shown in the figure I have attached above?

Nicholas Carley said:

You see my boxes have been communicating. The deal is they stop for no apparent reason.  After that they are dead for talking with the chip, they still communicate with the host computer program.

So once they stop communicating you no longer can get them back working? Power cycling the device and the USB2ANY does not work? Have you determined if the problem is with the USB2ANY or the EVM? For example the USB2ANY works with another device or the EVM works with another USB2ANY?

Any chance anything was modified on the EVM?

When you probe signals from the uWire board do they seem reasonable?

Thanks,

Vibhu

Hi Vibhu,

We confirmed we are using the latest document from the website. Our setup matches the one in the image you posted.

Power cycling does not fix the issue, it persists. There is no output signal detected from the USB2ANY.

There are no modifications to the EVM.

Thanks,
Nick

Hello Nicholas,

Earlier you said that the USB2ANY was functional, and now you see that the USB2ANY does not have any output signals. If that is the case it sounds like the USB2ANY is fried.

Is it possible that the uWire adapter was configured to a different configuration previously and no longer works?

Same questions as my previous response.

Have you determined if the problem is with the USB2ANY or the EVM? For example the USB2ANY works with another device or the EVM works with another USB2ANY?

Is it safe to say the USB2ANY does not work with other EVMs as well with/without uWire adapter?

Also could you check to see if the uWire header has the 15k-27k voltage dividers populated? You may need to check these with a multi-meter to determine if they are the right values. These voltage dividers were designed for a 5 V microcontroller, so it may be the case the resistors to GND need to be DNP'd and the series resistors replaced with a short.

Thanks,

Vibhu