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Interface the ADS1298 eval module to a PIC18F4550

Marty 56222
Prodigy 30 points

Other Parts Discussed in Thread: ADS1298

Hello,

I am looking for information on how to interface the ADS1298 eval module to a PIC18F4550 using J3 on the eval module.  Can anyone provide any details on which I should connect?

Thank you very much!

Marty

  • 0
    TI__Guru**** 182881 points

    Hi Marty,

    Unfortunately we don't have anything specifically (code or hardware wise) to help you with the PIC18F4550.  I've not used that micro myself, so I'm not sure if there is any particular 'gotcha's' to worry about.  We have used our MSP430 devices with the ADS1298 though and the hookup is straight forward. 

    The SW interface is an SPI protocol that you would need to tie into P3.  The SCLK, SDI and SDO shown on page 70 of the Users Guide would tie to your SPI Clock, MOSI and MISO respectively.   The /CS could tie to your SPI SS output or be tied to GND, SPI Start and RESET would go to any available GPIO.  SPI DRDY would go to an interrupt on the uC.

    Hopefully that helps a little...

  • 0 in reply to Tom Hendrick
    Prodigy 30 points

    Hi Tom,

    Thanks for the reply.  The information you provided will help me get going in the correct direction.

    It looks like the SPI interface to the board may be straight forward - we can connect the pins on J3 (SCLK, SDI, SDO, /CS, SPI Start, Reset, and SPI DRDY) to the appropriate connections on the PIC.  It appears that the power is supplied to the ECG FE Board via J4.  What specific power should we supply (and on which pins) to make this work?

    Thank you,

    Marty

  • 0 in reply to Marty 56222
    TI__Guru**** 182881 points

    Hi Marty,

     

    Power to the ECG FE board does get supplied through J4.  You need +5V and another 1.8 or 3.3V supply for the digital I/O.  You can use the existing test points on the board with a clean linear supply - TP8 is GROUND.  Both the 5V and DIO supplies need to be referenced to TP8.  The 5V supply can be connected directly to TP7 and the DIO would be connected to either TP9 or TP10 depending on the position of JP28.