• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 46 subscribers
  • Views 381 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.

ADS1299EEGFE-PDK: No output from the Dout pin of the evaluation board

Bharath Kumar92
Prodigy 20 points
Part Number: ADS1299EEGFE-PDK

Greetings. I am trying to interface ADS1299EEGFE-PDK with Arduino for acquisition of EEG signals.

I am using the library given in the link given below

https://github.com/OpenBCI/OpenBCI-V2hardware-DEPRECATED/tree/master/Arduino/Libraries/ADS1299

I have tested the power supply as given in the datasheet of ADS1299EEGFE-PDK and they all look good. The connections are as follows

SCK = 13
MISO [DOUT] = 12
MOSI [DIN] = 11
CS = 10
RESET = 9
DRDY = 8

The jumper configuration are done as per the instructions given in the datasheet. I tried debugging the SPI communication using DSO. I was able to get the MOSI, SCLK, CS signals correctly but I am not getting any output from MISO[DIN]. 

  • 0
    TI__Guru 66186 points
    Hello Bharath,

    Welcome to our forum and thank you for your post!

    (MISO = DOUT)**

    First I have a couple follow-up questions before we dive in.

    1. Are you seeing the /DRDY pin pulse after start-up? Following power supply ramp and the external /RESET pulse, /DRDY should begin pulsing at the default data rate (falling edge to falling edge).

    2. Have you tried reading both register data and conversion data? Do either one work or neither?

    Best Regards,
  • 0 in reply to Ryan Andrews
    Prodigy 20 points

    Hello Sir,

    Thanks for your reply,

    The output of reset pin pulse is as per the power up sequence coded in the library. The DRDY pin pulse is always high. I tried reading both register data and conversion data, neither of them are working.

  • 0 in reply to Bharath Kumar92
    TI__Guru 66186 points
    Hi Bharath,

    Can you verify that the master clock (CLK) is applied and the START pin is high? The POR counter only begins after both supplies have ramped and clock is applied. If START is pulled up on your board, /DRDY should begin pulsing as soon as the POR reset sequence is complete.

    Regards,