LMK03806BEVAL: How do I readback the lock detection (LD) pin?

Hi Vicente,

Thanks for the reply.

My understanding of the datasheet is that - in order the Ftest/LD pin (pin-33) to output a value that corresponds to lock-detect (which is PLL DLD), LD_MUX needs to be set to '2' and LD_TYPE to '3' (output push-pull) in R12. So reading back R12 register won't let us know the value of pin-33. Isn't it?

These settings would only ensure that pin-33 outputs the status of PLL lock detection.

My question is how can I read the status of (in other words what value is set on) pin-33 at a given point, remotely, without having to look at the D3 LED on the eval board?

(I did set the register R12 correctly in my TICS-Pro SW and I am able to see LED D3 glowing on the EVB, indictaing the lock-detection. However, I am looking to read the value of pin-33 or LED D3 remotely)

If my understanding is incorrect, please do correct me.

Many thanks for your continued support, Vicente.

-Hima

Hi Hima, 
I think it might be possible. I would need to double check with my EVM. I'll get back to you as soon as I have an update. 

Regards, 

Vicente 

Hi Vicente,

Did you get a chance to verify it on your EVB, please?

Thank you

Hima

Hi Hima, 
The validation team required use of my EVM and unfortunately, I have not gotten it back... 
I have not been able to verify on my EVM yet. 

Regards, 

Vicente 

Any luck, Vicente? 

Hi Vicente,

Really appreciate your efforts on verifying this.

Besides the fact that there is no ability to read back registers of this part in TICSpro, I don't think there any register fields that indicate the PLL lock. (There is something called "PLL DLD" in LD_MUX, but I don't think that is accessible to the user?)

If you know any register field, please let me know, I will try to read through LabView (from the previous threads, I found a library file where "Read Register" is one of them. I hope I can do the readback in labview using that lib file)

Thank you for your support, Vicente.

Regards

Hima

Please ignore the highlighted "Select Device" in the above snapshot.

Hi Hima, 
Let me look further into this. 
I'll try reaching out to design and see if they know of a specific register to determine if the PLL is locked. 

Regards, 

Vicente

Hi Vicente,

It will be really helpful if you could provide some kind of confirmation from the design team whether there is any register that indicates the PLL lock, before the Christmas holidays, please, if possible.

Many thanks for your support

Regards

Hima

Hello Hima,

I looked over the documentation about our registers and it does not seem that we store that value anywhere, unfortunately (since it is an older part and we did not have that feature implemented before, as Vicente mentioned).

However, I will let Vicente answer if he has heard something different from the designer. He is currently out of office and should get back to you by the end of this week.

Best,

Andrea