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ADS1292R: trouble of double ads1292R working

user1915296
Prodigy 110 points
Part Number: ADS1292R
Other Parts Discussed in Thread: ADS1292

I have two ads1292RS.They use the same SPI bus and different  CLK,CS and DRDY.  Both of them use the internal clock.  We set both chips at 250SPS  continous sample but  found one chip will pause(no DRDY signal) about 50ms  a t every 2s, at the same time ,the oher chip alwways stopabout 50ms   after 4-5  samples.  Following the manual,when using the same spi BUS, the Clock PIN should be connect,if we don't connect

these two pin, can the chip work correctly?

  • 0
    TI__Guru 55232 points

    Hi,

    You would want to route the internal clock from one ADS1292 to the other ADS1292, such that both devices are running off of the same clock. It is possible for these chips to work correctly without doing this, however the data will not be taken at exactly the same time. It is also possible that there is a timing issue. The BIOFAQ can be used to help diagnose if this is the issue: https://e2e.ti.com/support/data-converters/f/73/p/772058/2855202

  • 0 in reply to Alexander Smith
    Prodigy 110 points

    We want to try the the following  way： one chip is set to continuous sample mode，the 2st chip is set to  single sample mode and  started  by the soft command after receiving 1st chip's  DRDY. Do you have some suggestions for this way？Thanks!

  • 0 in reply to user1915296
    TI__Guru 55232 points

    Hi,

    Since both devices are sharing the same SPI bus, the data from one device must be relayed by the other. I don't think this will work if both devices are running off of different clocks since getting the timing to align without truncated samples would be very difficult. If this is what you would like to do, then I would recommend routing separate SPI communication lines to both devices.