• State
  • Locked Locked
  • Replies 4 replies
  • Subscribers 47 subscribers
  • Views 287 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS1278EVM-PDK DRDY

Alper Zengintas
Prodigy 30 points
Other Parts Discussed in Thread: ADS1278EVM-PDK

Board: ADS1278EVM-PDK (ADS1x7xEVM Rev E) (http://www.ti.com/lit/ug/sbau197/sbau197.pdf)
Issue1: I made below changes on the switch and jumpers in order to
obtain low-power and low-speed mode of this board.
M1 of S2 = "ON"
M0 of S2 = "ON"
CLKDIV of S2 = "OFF"
JP4 = "OFF"
JP5 = "OFF"
According to documentation of the board and for this configuration, I
was expecting to see 10,547Hz signal on the DRDY pin (interrupt) but I
measured 52KHz signal.
Issue2: After the above test, I tried to connect an external signal to
the board. I made following update to the previous configuration and
connect the clock signal to the board..
JP5 = "ON"
This update didn't make any changes on the DRDY signal. It has the
same interrupt frequency.
Thank you.
  • 0
    TI__Mastermind 23235 points

    Mr Zengintas -

    There are a couple of items to note:

    1.  Are you using the ADS1278EVM separate or with the motherboard?
    The motherboard is required for power and connected signals unless you power the EVM board at the correct power terminals and provide necessary external signals.

    2.  The software is written to use the hardware with the default configuration.  Changes from the default configuration will not allow the software to work or work correctly.

    3.  Using the EVM plugged onto the MMB0 may result in some contention between the DSP outputs and your signals.  Make sure that the default state of the DSP pin is not overriding or causing contention with the signals you may be trying to provide.

  • 0 in reply to Greg Hupp
    Prodigy 40 points

    Mr Gupp,

    We are working on this project with Alper. The board isn't used with the MMB0 mother board. The EVM is connected to the Pandaboard. In addition, for once, I disconnected the DRDY pin from the Pandaboard in order to prevent complications and measured the DRDY pin with scope.

    Kind regards,

    Cumali Ceylan 

  • 0 in reply to Cumali Ceylan
    TI__Mastermind 23235 points

    Are you providing all the supplies to the board - AVDD, DVDD, and IOVDDD?

  • 0 in reply to Greg Hupp
    Prodigy 40 points

    Yes,

    I connect AVDD, DVDD and IOVDD voltages to to ADS1278EVM-PDK board.