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1298 connections

Adam Freed
Prodigy 215 points
Other Parts Discussed in Thread: ADS1298

Designing a system with a PIC24 and ADS1298.  Can I keep the START and CLKSEL pins tied high, or do I have to have them programmable through software?

Thanks.

  • 0
    TI__Guru**** 180961 points

    Hi Adam,

    In the ADS1298, the CLKSEL pin can be held static 'high'.  The START pin can be held high as well if you have only one device in the system and you are not trying to synchronize multiple devices.

  • 0 in reply to Tom Hendrick
    Prodigy 215 points

    Hi Tom,

    Thanks for the reply. 

    Can I tie CS to ground, or do I have to be able to toggle it at any point? 

    I'm using a modified ADS1298FE EVM board on which I have brought the power and SPI signals over from an Explorer16 board equipped with a PIC24F.  I want to put the ADS1298 in flowthrough mode.  I am controlling the 1298 with the PIC mcu and will be saving data to a SD card.  So far, I have not been able to see anything coming back from the ADS1298.

    Cheers,

    Adam

  • 0 in reply to Adam Freed
    TI__Guru**** 180961 points

    Hi Adam,

    You could tie /CS low, however if your SPI transfers get corrupted somehow, toggling /CS should reset the serial interface.  It would be best to have active control over the chip select input especially during your debugging phase.  Once your happy with the stability of the transfers, you could simply leave /CS low.

  • 0 in reply to Tom Hendrick
    Prodigy 215 points

    Hi Tom,

    Ok, I'll make that change.

    Do I have to follow Fig. 50 on page 66 of SBAS459C to start programming the ADS1298, or can I simply send the SDATAC command then start programming registers?

    Adam

  • 0 in reply to Adam Freed
    TI__Guru**** 180961 points

    Hi Adam,

    The ADS1298 data sheet is SBAS459F, with the last update back in October.  The current flow chart is on page 70, Figure 64.  You should follow that to the extent that you can.