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ADS127L11: How to connect ADS127L11 daisy chains

Part Number: ADS127L11

hi,

May I ask how to connect ADS127L11 daisy chain and how to connect pins DRDY START RESET respectively. 

Thanks!

  • Hello Jeno,

    You can connect multiple ADS127L11 ADCs in daisy-chain as shown below. 

    All START pins should be tied together and connected to a GPIO pin.  Also, all RESET pins should be tied together and connected to a separate GPIO pin.

    A single /DRDY pin can be connected to either a GPIO pin for software polling, or an Interrupt input pin.  Sending a low-to-high START pulse to all ADC's will synchronize the ADCs to the same clock edge.  After synchronization, all /DRDY outputs will now be synchronized to the same clock edge and to each other, requiring only a single /DRDY output to be connected to the system processor.

    Also note that all ADCs need to be clocked from the same clock source.  For more details, please take a look at this application note.

    ADS127L11 in Simultaneous-Sampling Systems

    There is also a reference design available using 4 ADS127L11 in daisy-chain that may be useful as well.

    Four-Channel Synchronous IEPE Vibration Sensor Interface Reference Design

    Regards,
    Keith Nicholas
    Precision ADC Applications