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ADS1262: Multiple ADS1262 data to Computer

Eduardo Arruda
Prodigy 110 points
Part Number: ADS1262


Hi,

I've seen on the Topic below that the ADS1262 do not support a broadcast mode.

If I want to syncronize the conversion between several devices I can use a common GPIO to all on START, but can I leave them on ground and syncronize them by START and STOP command?

My main question is:
Is there a way to get data from 4,8 or more ADS1262 and transfer to the computer with a single connection (USB, Ethernet cable, WIFI...)?
I would like to see these data on the computer on real time (or nearly) and be able to save the data.

If you could point me in a direction I would be really thankful.

  • 0
    TI__Mastermind 44680 points

    Hi Eduardo,

    While you could broadcast the START1 (SPI) command, you just need to be aware of the possibility of contentions on the DOUT signal and perhaps provide some resistance between each of the DOUT pins to limit current, should some DOUT's drive high while others are trying to drive low.

    Using the START pins on each ADS1262 and sharing a single GPIO connection to every device is probably a more elegant solution and less error prone. The main thing to consider is the trace lengths to each ADC...you'd want to try to keep them equal so that the START signal edges arrive at about the same time.

    Regarding your question about sending data to the PC...
    USB 2.0 should be plenty fast enough to send 4 channels of ADC data to the PC, though this does depend somewhat on how long of a data word you use and how fast of a data rate you decide to use for the ADCs. The way you do this up to you and the microcontroller/processor that you decide to use. However, not all microcontrollers will be fast enough to take advantage of the full USB throughput, so just be aware of that.

    Best regards,
    Chris