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start sequence ADS1298

uwe5000
Prodigy 100 points

Other Parts Discussed in Thread: ADS1298, ADS1296, ADS1294

Hello,

 

in the datasheet you have an initial flow at power up diagram. In this flow you use some pins (START nPDWN and nRESET) and OPCODEs for initialization. Is there a possibility to use only OPCODEs. I want to save pins on my controller and so I want to use only the SPI interface to control the ADS1298 device.

  • 0
    TI__Mastermind 43915 points

    Hi uwe5000,

    You are able to tie the static I/O lines high or low depending on the states you would like them in. If unused, I would recommend tying the /RESET and /PDWN lines high through weak pull up resistors to the digital power supply. The START pin can be tied high or low through weak pull up resistors depending on if you would like to use the START op code. Read through the START section in the data sheet for more information.

    Regards,

    Tony Calabria

  • 0 in reply to Tony Calabria
    Prodigy 100 points

    Thanks for the answer.

    I have another question. In the datasheet you write that the ADS1294 and ADS1296 don’t have some registers that theADS1298 has. If I write or read multiple bytes to or from the ADS1294 does it jump over this missing register with the pointer?

     

  • 0 in reply to uwe5000
    TI__Mastermind 43915 points

    Hi Uwe5000,

    The unused channels are internally disabled but you will need to write to the unused registers as well when using the multiple write feature. The pointer does not 'skip' over the registers. Same holds true for reading.

    Regards,

    Tony Calabria