LMK03318EVM: Programing with USB2ANY

Prasoon,

A few questions to assist in the debug:

- What is the current draw of the LMK03318?

- Is this a new EVM or has there been modifications to it?

- What is the state of the HW_SW_CTRL jumper? This must be Low for proper I2C communication.

Best,

Cris

Hi Cris,

The power supply is showing 0.683A @ 5V. .

The EVM is a new EVM. The only modification is installing jumper wires for I2C on J28.

pins 2 and 3 are shorted on HW_SW_CTRL jumper.

Prasoon

Prasoon,

Can you send a photo of the jumper connections on the board? There are some configurations that do not allow for I2C connection. Additionally, can you probe the I2C connections with the added jumper wires? Are the pins being pulled low at all times?

Thanks,
Kadeem

Hi Kadeem,

Photos attached.

The photo upload is causing loss in resolution of the image. I can send the photos to en email address if that helps.

The probed the jumper wires with a DMM on the board (unpowered). The wires are not shorted to ground or to each other. I referenced the pinmap of the USB2ANY to make sure SDA and SCL are hooked up correctly.

Prasoon

Prasoon,

The EVM is already equipped with a USB2ANY, is there a reason you're using the external adapter? If you plug the usb cable directly to the EVM, do you get proper I2C connection?

Best,

Cris

Hi Cris,

My end application has LMK03318 and CDCEL925 on the same PCB. I need to be able to program both of those PLL modules over I2C using the USB2ANY. So, I am trying to validate the programming procedure on the EVMs. So, you can expect more questions when I attempt to add the CDCEL925 EVM as well.

Prasoon

Prasoon,

The LMK03318 evaluation module has a USB2ANY module built onto the board. This is accessible through the USB port on the board.

For the CDCEL925, a different software (ClockPro) is used for interfacing with this board. For usage with the USB2ANY, you need to have custom software written to interface with this board using the USB2ANY.

Thanks,

Kadeem

Kadeem,

Thanks. Barring USB2ANY, how do you propose I program LMK03318 and CDCEL925 for my end application?

Prasoon

If I use the onboard USB2ANY, looks like the LMK03318 is being detected as an I2C device:

Is this an issue due to the USB2ANY firmware rev? TICS Pro updated the firmware to 2.9

Kadeem,

I raised this as a separate question.

Prasoon,

Prasoon Joshi said:

Is this an issue due to the USB2ANY firmware rev? TICS Pro updated the firmware to 2.9

It may have been. Have you tried using the external USB2ANY since updating the firmware?

Prasoon Joshi said:

Barring USB2ANY, how do you propose I program LMK03318 and CDCEL925 for my end application?

Using the USB2ANY should be feasible, but you can also use a different I2C writer if desired. There are many applications where the customer uses the I2C writer they are most familiar with.

Best,

Cris

Hi Cris,

I downloaded the USB2ANY explorer and tried with both Fw revs: 2.8 and 2.9. I enabled the I2C checkbox prior to FW change:

I am using TICS PRO and not TICS PRO 2

With 2.8.2:

I get a siimlar result regardless of the FW rev.

I think I see that the 3.3V is set to OFF when I try to access USB2ANY with the explorer. I can program the 2.9 rev of the FW with the TICS Pro and the 2.8 FW with the explorer:

FW rev 2.9 explored with the explorer:

Programming rev 2.8 with explorer shows the following:

However, when using with TICS Pro, I can't seem to access I2C. Scan Bus fails in both situations.

Prasoon

Prasoon,

Do you have both the Explorer and TICSPro open at the same time? It's likely both programs are trying to talk to the device at the same time and causing an issue. 

You would need to have only one of the programs connected and then disconnect -> reconnect the USB2ANY.

Best,

Cris

Cris,

I don't have both connected at the same time. I only have one of them connected at a time. I am willing to give some more FW revs a try. But, I don't know where to download them from.

Prasoon

Cris,

I just re-read the instructions on the CDCEL925 EVM. Looks like the CECEL925EVM can be used, along with the Clk Pro SW to program the CDCEL on a user's PCB:

Can you please confirm that this is correct? If so, I may not need to use the USB2ANY for programming the CDCEL925.

In the same fashion, can the EVM for LMK03318 be expolited to program the LMK03318 for my end application? 

Thanks,

Prasoon

I thought about this for a few more minutes, and if you're using an off-board USB2ANY, you should also have the same circuit reproduced in your dongle. If you enable the 3.3V supply, and enable on-board pull-ups in the USB2ANY (which would be done by TICS Pro), you should have pull-ups that can be used. So this must not be the whole story.

Have you disconnected R166 and R167 on the board? Without disconnecting these, if the on-board USB2ANY is not at least powered, I2C will just sink current into the on-board USB2ANY microcontroller pins or through the body diodes of Q3/Q5 into the 3.3V network.

Hi Derek,

That is an excellent point. No I have not de-popped these resistors yet. Let me try doing that.

Thanks,

Prasoon

I see we're having parallel conversations in this thread: https://e2e.ti.com/support/clock-timing-group/clock-and-timing/f/clock-timing-forum/1533032/cdcel925-programming-the-cdcel925-with-usb2any

Let's consolidate to this thread if possible. I'll leave my answer over there, but in summary, this could work with a 1.8V I2C bus master, but with a 3.3V bus master you'd need a level shifter. There's additional discussion about the USB2ANY specifically in that thread, which may or may not be applicable to what you're trying to do.

Ok. I created a new thread, since I was unsure if TI likes to track down customer queries per IC model. We can consolidate here for both of the PLL ICs, if that is preferred. Would you like to me to resolve the other one?

Yes please to the resolution on the other thread.

I generally request to split threads when the topics are dissimilar, or the product lines responsible for the subsequent products are on a separate subforum. I generally request to consolidate threads when the topics are related, and the products in both threads are the responsibility of the same subforum. This is the latter case. I can't speak for every product line or even everyone in clocks and timing, but I think in our case it makes sense.

To summarize the other thread: Yes, you can connect to the I2C lines with an external bus master as described in the user's guide, provided your bus master can communicate with 1.8V levels. And separately managing USB2ANY + TICS Pro for LMK03318, along with some other I2C interface wired directly to the CDCEL925 EVM to bypass the on-board USB interface, should work.

I'm not clear on how you plan to interface Clock Pro with some other I2C interface though. Are you planning to prepare the configuration, export the register settings, and then pass that to some other I2C circuit?

I have one more question on the LMK03318 output banks. Is it possible to pin swap P vs N? In my end application I am having to utilize a 2nd PCB layer for RF traces. If it was possible to swizzle P and N for an output bank, that would eliminate vias in the routing.