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PGA411Q1EVM: PGA411 EVM not working as is should.

David Petryk
Expert 1275 points

Part Number: PGA411Q1EVM

I am having a few issues getting the EVM to operate like it is described in the users guide.

The EVM seems to be connected through the USB properly with the following exceptions;

1. PGA41x-Q1 Device shows "Not available"

2. The Device state is in "RESET N/A" - I am unable to change states.

  when I try to change states I get this message;  "Unable to switch state. Try again. If issue persists, Reset EVM & restart GUI.

I am using windows 10.

I am stuck here until I can get the 411 into the normal state.

Thanks

  • 0
    TI__Mastermind 23810 points
    David,

    Is the green LED by the MCU_RST button solidly green while you have the GUI open, or is it blinking?

    If the USB connection is good, then usually I see this issue in the following scenarios:

    - 5V power has not been applied between the PWR_IN and GND banana jack inputs. The EVM is not designed to power the EVM from USB alone.
    - The jumper on J3 is missing or incorrectly placed. Please double check the correct setting with the user's guide.

    If those two steps do not work, then please check:
    - Is NRESET is being held low? You can check the state of this input by probing the NRESET test point on the board.
    - Double check VCC, QVCC, VIO, and VDD voltages by using the test points on the EVM.
  • 0 in reply to Clancy Soehren
    Expert 1275 points

    Please understand that I have spent hours trying to get this thing to operate as it should.  No luck so far.

    I have plugged this thing in and out at least 100 times every way possible and have not been able to achieve success. I get connection ststus "connected" but 411 is "not available"

    I have had the green light blinking and solid. With and without the  GUI running. When it goes steady on, the NRESET line is being held low by the 430 MCU chip and therefore the 411 will not run. So it shows the 411 "not available.

    Yes I have power connected correctly. The J3 jumper is in the middle position. I tried the other two positions and neither produced any different results.

    In order to move forward I connected the board to an SPI channel and was able to talk to the 411 just fine. It is faulting for some reason so I see the excitation for about 140ms when starting up then it stops with the FAULT line hi. So there is something causing  a fault. I went back to trying to connect with the GUI so I could observe the various status registers to determine what the problem is but I cannot get it working.

    If I cant get the GUI to work I will be forced to do it through the SPI channel and code. I don,t  have the time for the trial and error going down that path.

    Why is it so difficult to get this thing to work correctly?

    I was going to past a screen shot but there is no "paste from word" button to be found.

  • 0 in reply to David Petryk
    Expert 1275 points
    I have my processor board connected to J11. It seems to me that the MCU on the EVM if held in reset will tri-state all the pins on the MCU should be in HI-Z mode and therefore will not interfere with my connections thru J11 connected to the 411 and mu CPU board.

    Is this assumption correct?

    I dont want to cut the board up just to be able to use it with another MCU.
  • 0 in reply to David Petryk
    Expert 1275 points

    How many poles does a typical resolver have?

    I need to set the CONFIG register bits 7,8 correctly. Not sure what to use.

  • 0 in reply to David Petryk
    TI__Mastermind 23810 points
    David,

    You need to tri-state the level shifters to avoid communication interference.

    NPLE is only used for the commutation encoder output. You will find that it has no impact on the other interface options, so you do not need to set it to match the poles of your resolver sensor.