HMC767 Eval Kit(s) - Lost Communication

Hello, 

I have a HMC767 eval kit with the USB interface board (full kit) and am using the internal oscillator (50MHz). I connected the boards to the computer and power supplies, powered on the supplies, and then opened the software. I load either the integer or fractional register files, but the Check Lock box always shows "Lost Communication" and never changes. Reading register 0 always returns FFFFFF (light grey). The 5.5V input is drawing 0.324 Amps. I have jumpers 1, 2, and 3 connected on the eval board. There are some jumpers on the USB interface, but I haven't changed their positions from what they were out of the box. 

I have another HMC767 eval board on hand, so I checked that as well with the USB interface board. Same result. I do not believe I have two bad eval boards, but am at a loss as to what to do next. 

Questions:

1) Are there specific jumper settings for the 121726-2 USB interface board that I need to set?

2) Should Jumpers J1, J2, and J3 be connected on the eval board? 

3) Is there anything else I should be doing to ensure communication with the board? 

Thanks

Parents
  • 0
    •  Analog Employees 
    on Feb 26, 2021 8:30 AM

    Hi, 

    It seems USB interface board is not able to communicate with the board. Can you check the jumper locations on USB interface? JP1 should be shorted with jumper cap, JP2 and JP3 should be open. 

    Regards,

    Kudret

  • Hello Kudret, 

    Yes, the jumpers are as you describe on the USB interface board. 

    Anything else to check? Is it a bad board?

    I did notice there were two pins on the back of the USB board that were solder connected: pins 18 and 19. I tested with this connection and it did not work, and I removed the solder connection between the pins and I still have the "Lost Communication". 

    Thanks

  • 0
    •  Analog Employees 
    on Mar 4, 2021 9:33 AM in reply to StormQuantifier

    Hi,

    I tried the evaluation board in my bench and don't see any issue. You should be seeing "Unlocked" instead of "Lost Communication" when GUI page is first opened before loading register file as below. You should keep the solder on pins 18 and 19.

    It is a very low possibility but is there any chance to be using broken ribbon cable between controller and board or any misconnection? 

    Can you also check Device Manager and verify controller is listed as below?

    Regards,

    Kudret

Reply
  • 0
    •  Analog Employees 
    on Mar 4, 2021 9:33 AM in reply to StormQuantifier

    Hi,

    I tried the evaluation board in my bench and don't see any issue. You should be seeing "Unlocked" instead of "Lost Communication" when GUI page is first opened before loading register file as below. You should keep the solder on pins 18 and 19.

    It is a very low possibility but is there any chance to be using broken ribbon cable between controller and board or any misconnection? 

    Can you also check Device Manager and verify controller is listed as below?

    Regards,

    Kudret

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