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ADS1298R: Interface between ADS1298 and microcontroller PIC18F4550

Rhuan Correia
Prodigy 60 points
Part Number: ADS1298R
Other Parts Discussed in Thread: ADS1298

Hi guys!

I'm developing an interface between ADS1298 and PIC18F4550 without Pace Detection. Please, I need to know if I have been doing right:

1) At least five SPI's communication pins of ADS1298 are necessary (DRDY, DOUT, SCLK, CS and DIN)?

2) Can DRDY be connected in a digital input of the PIC18F4550, like TX/CK pin?

3) If I configure the internal registers and my code, should I tie:

PWDN + RESET + CLKSEL in DVDD,
START in DGND
GPIO pins as NC?

Thanks in advance for your answers.

  • 0
    TI__Guru 66346 points

    Hello Rhuan,

    Thanks for your interest in the ADS1298!

    1. Yes, you will need /DRDY, /CS, SCLK, DIN, and DOUT to communicate with the ADS1298
    2. /DRDY is meant to be used as an interrupt so that your MCU knows when to read data. I'm not sure which pin on the PIC18F4550 that would correspond to.
    3. The pin configurations are correct. /PWDN, /RESET, and CLKSEL can be tied to DVDD through a pull-up resistor. You may still send the RESET SPI command to reset the device when necessary. Similarly, START can be tied low to GND through a pull-down resistor and the SPI START command can be used to begin conversions. GPIO pins that are not used should be shorted to DGND (see section 9.3.2.1).

    Best Regards,