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ADS1298 RESET line required?

JONATHAN VIVENTI
Prodigy 60 points
Other Parts Discussed in Thread: ADS1298

Hi,
I've previously communicated with an engineer at TI that said the RESET line was not required on the ADS1298 and that the reset opcode could be used in place of the line, as indicated in the datasheet (p.34). We've built a system without the reset line because we were constrained on physical connections and tied the RESET line high. However, when we do this, we cannot connect to the ADS1298 over the SPI interface. It does not reset properly when sending the opcode for reset alone. We have confirmed this on the TI development board as well.

Can you please confirm if this is an error in the datasheet? Is the reset line actually required to properly reset the part after power on? Or is there some way the reset opcode can be used instead?

Thank you,
Jon

  • 0
    Prodigy 60 points

    More info:

    START is tied low.

    RESET is tied HIGH.

    CLKSEL is tied HIGH (internal clock).

    CS is tied LOW (ads1298 is the only part on the SPI bus).

    Is CS actually the problem? We could be getting an extra clock, misaligning the commands. 

    The lines we have connected to the microprocessor: DRDY, DIN, DOUT, SCLK, PWDN.

    Can we use PWDN to reset the serial interface if we don't have CS?