LMK62I0-100M: LMK62I0-100M OE pin 1

Hi Bjorn, 

Can you provide the schematic or setup you are using to probe the OE pin voltage? Unfortunately we don't have any LMK62 units in the office, but I just checked on a LMK61E2EVM (which should have the same OE behavior) and I saw the OE pin was pulled up internally and the output was enabled even when the OE pin was left floating. 

Regards, 

Connor 

Hello

Thank you for your reply. Did you measure 3.3v at pin 1 ( OE) ?

This is my schematic.

I measure 0 v at pin 1 on U208. The pin (was) floating.

I connected pin 1 via pin 6 and it works.

Please let me know what you think.

Hi Bjorn, 

I measured 1.8V on the OE pin when it was left floating. Just to confirm, TP211 is completely isolated and there's no way that it could accidentally be pulling down the OE pin? It may be helpful if you could also include some images of the board layout if possible. Also, can you provide the top marking of the LMK62 device you are using?

Regards, 

Connor 

Hello

Measured pin 3 on 3 different boards in this batch, TP211 measures x mV.

If I measure resistance between TP211 and GND I have about 30.3k ohm.

See attached picture from PCB. Only top layer is involved.

If I read the text on the device:

TI 6210

1BZEV53

10000

Thank you so much for your help.

Hi, 

Your schematic and layout look good to me, so the OE behavior you're seeing is definitely strange. I found an LMK62 board in the office, I will test it out on Monday and confirm the OE functionality.  

Regards, 

Connor 

Hello

I have order 7 more pcs of LMK6210-100M from the same sample order ( EMS-stock ), they are not mounted on a PCB.

This means I will add 3.3v and measure on pin 1 and report back to you. In case of they are fulty ( or documentation is wrong) I would like you to create an RMA ASAP since it looks like this is  a serious problem from your side. I can send you the pcs.

Please let me know what you think.

Thanks

Björn Hellerstedt

Hello Connor

Have you done any test? 

BR

Björn H

Hi Björn, 

I did a quick check on our LMK62 EVM and I'm seeing the same type of behavior that you're describing (no output unless the OE pin is pulled high). I'm talking with the design team now to see if this is a typo on the datasheet, I'll let you know if there are any updates. 

Regards, 

Connor