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ADS1282EVM-PDK not connecting to ADCPro

ROBERT BONINI
Intellectual 320 points
Other Parts Discussed in Thread: ADCPRO, ADS1282, ADS1282EVM-PDK, ADS131E08

I have an ADS1282EVM with an MMB0-revD which I can't seem to get to work.  I've read through multiple other questions on the e2e boards about this and none of the solutions seem to apply/work.

When I power the system up and try to connect, ADCPro gives the "DSP not ready...Retrying" message and the subsequent 'timeout condition' error and does not connect to the board.  I have an ADS131E08EVM board which works just on the same MMB0.  I also have two MMB0s and observe the same behaviour with both.

Setup:

- external wall supply for +5V

- lab bench supply for +/-10V

Behavior:

- when powered up WITH ADS1281EVM installed on MMB0, 1.6V LED does NOT turn on

- when powered up WITHOUT ADS1282EVM installed on MMB0, 1.6V LED DOES turn on

- the missing stripe 'b' appears on the seven segment display

- AVSS = 0V and AVDD = 5V BEFORE attempt to connect with ADCPro

- AVSS = 0.4V and AVDD = 2.5V AFTER attempt to connect with ADCPro

Attempts to Date:

- uninstall and re-install ADCPro and 1282 plugin

- various power up order / configurations

The fact that the AVSS/AVDD configuration appears to try and switch to the bipolar power mode seems incorrect as I do not have a -5V supply connected.  I have looked through the schematic and can't seem to find where that decision is made, but it does seem to come from the MMB0 controller.

Any thoughts or input on how to proceed in troubleshooting this board would be greatly appreciated.  

  • 0
    TI__Mastermind 44550 points

    Hi rsbonini,

    Welcome to the TI E2E forums!

    I'm glad you've got the external +/-10V supplies connected!

    You're problem sounds very similar to one that I have encountered before... Double check the +/-10V supply voltages with a multimeter and make sure that you do not have a current limit set on your bench supply!

    Other things you can check:

    • Are you using the default jumper settings?
    • What is the voltage on GPIO3 (J5.12)? The bipolar supply is selected by pulling this pin high. The MMB0 should be setting this low.
    • Which version of the software are you using?

    Best Regards,
    Chris

  • 0 in reply to Christopher Hall
    Intellectual 320 points

    Chris,

    The +/-10V supplies do indeed check out on the multimeter.  Current limit on the supply is set to maximum (1A).

     I've just quintuple checked the jumper settings and  they match exactly the default settings found in Figure 4, page 7 of the User's Guide.

    Are you sure about the polarity of the bipolar set signal?  Looking at the schematic on page 29 of the ADS1282EVM User's Guide, the output from pin J5.12 passes through an inverter (U8) and drives the 'enable' pins of the +/-2.5V regulators, as well as controlling a few bypass MOSFETs.  From my reading of this, J5.12 should remain high to keep the board in unipolar supply operation.

    The voltage on J5.12 when the board is first powered is 3.3V with AVSS = 0 and AVDD = 5V.  After ADCPro tries to connect, J5.12 drops to 0V with AVSS = 0.4 and AVDD = 2.5V.  This is how I would expect the polarity of setting unipolar/bipolar to work out form the schematic but I am unsure why the MMB0 is operating this way.

    Software Versions:

    ADCPro - 2.0.1

    ADS1282 Plugin - 2.0.0

    Any further suggestions?

    Thanks for the speedy reply.  Appreciate the help.

  • 0 in reply to ROBERT BONINI
    TI__Mastermind 44550 points

    Hi rsbonini,

    rsbonini said:
    Are you sure about the polarity of the bipolar set signal?  Looking at the schematic on page 29 of the ADS1282EVM User's Guide, the output from pin J5.12 passes through an inverter (U8) and drives the 'enable' pins of the +/-2.5V regulators, as well as controlling a few bypass MOSFETs.  From my reading of this, J5.12 should remain high to keep the board in unipolar supply operation.

    You're correct! I was looking at Table 2 in the ADS1282EVM User's Guide, which is incorrect about the GPIO3 polarity.

     

    rsbonini said:
    The voltage on J5.12 when the board is first powered is 3.3V with AVSS = 0 and AVDD = 5V.  After ADCPro tries to connect, J5.12 drops to 0V with AVSS = 0.4 and AVDD = 2.5V.  This is how I would expect the polarity of setting unipolar/bipolar to work out form the schematic but I am unsure why the MMB0 is operating this way.

    It would appear like the problem is on the MMB0. You're using the latest hardware and firmware versions, so no problems there!

    How are the MMB0 jumpers configured? You should have J12 and J13B connected, while leaving J13A disconnected.

    One other thing, do you have a ground connection from your power supply to the MMB0's GND?

    Best Regards,
    Chris

  • 0 in reply to Christopher Hall
    Intellectual 320 points

    I somehow doubt it's the MMB0 hardware.  As previously mentioned I have 2 of them (both rev.D) and they both give the same behaviour.  It would seem to me that some sort of condition is being indicated by the ADS1281EVM to the MMB0 that's making it try to switch to bipolar operation.  MMB0 jumpers are as indicated.

    Initially I was using a +20V supply with a couple divider resistors to reference mid-supply.  I then switched to a true -12V/0V/+12V supply, with GND reference to 0V.  There was no apparent difference in operation.

    It's possible that the ADS1282EVM was damaged by someone else in our lab before I got my hands on it.  I'm planning to try and connect a -5V supply and see if I can at least get a connection in bipolar mode.  Additionally it seems that ADS1282EVM is not available as a stand alone purchase.  Has TI discontinued it's availability?  The cost of a complete ADS1282EVM-PDK is really unnecessary when I already have two MMB0s.  

    Thanks, -robert

  • 0 in reply to ROBERT BONINI
    Intellectual 320 points
    Chris,

    I connected a -5V supply to the ADS1282EVM and tried to connect with ADCPro, no joy. However after ADCPro failed to retry my computer started installing new hardware, it was the USBStyx driver installation which I had definitely completed previously. I let windows finish the installation, cycled power to everything, and restarted ADCPro. Everything connected first try. I was able to set registers, collect data etc.

    I powered everything down, disconnected the -5V supply and tried to connect and again everything seemed to work just fine. I guess the USBtyx driver didn't install correctly the first time (although I did try an uninstall/re-install of everything and USBStyx seemed to work with the ADS131E08 just fine). Perhaps, connecting the -5V somehow jogged it into re-installing the driver?

    Glad to have it working. I'd be happy to provide any data to help improve/debug the firmware, just let me know what would be helpful.

    Again, thanks for your responses.
  • 0 in reply to ROBERT BONINI
    TI__Mastermind 44550 points
    Hi rsbonini,

    Thanks for the update and I'm glad it's working for you now!

    I think the information you provided is exactly what I need! Typically, the USBStyx driver will finish installing after the firmware is loaded onto the MMB0. (The firmware is loaded when the ADS1282EVM is selected from ADCPro's "EVM" drop-down menu... However, it sounds like the firmware was not properly loading without the -5V supply, which shouldn't be required,

    Please let me know if you have any other ADS1282 related questions!

    Thanks and Best Regards,
    Chris
  • 0 in reply to Christopher Hall
    TI__Mastermind 44550 points

    Hi rsbonini,

    Just as a follow-up, may I ask which version of Windows you're using with the ADS1282EVM, and is it a 32-bit or 64-bit version?

    Thanks and Best Regards,
    Chris

  • 0 in reply to Christopher Hall
    Intellectual 320 points
    No problem,

    Windows 7 Enterprise SP1 x64
  • 0
    Prodigy 60 points

    The issue is not power supply related but just a driver problem.

    Download and install manually the mmb0_driver_install_x64-v1.0.0.0.msi or mmb0_driver_install_x86-v1.0.0.0.msi (assuming you have MMB0 motherboard). If you have 64bit computer, install the x64 even the ACDPro-wlvrt.exe is a 32 bit executable..

    Anyone knows if there is available an ACDPro package compiled for 64bit?

    thx,

  • 0 in reply to Vasile Surducan
    TI__Mastermind 44550 points
    Hi Vasile,

    We only have the 32-bit version of ADCPro; however, this should work on 32 or 64 bit operating systems. It is more important that you install the correct driver version. Please note that you may need to disable Windows driver signing enforcement when installing the MMB0 driver.

    Best Regards,
    Chris