JAJSP40A March 2022 – October 2022 ADS117L11
PRODUCTION DATA
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The serial interface is used to read conversion data, configure device registers, and control ADC conversions. The optional CRC mode is used to validate error-free data transmission between the host and ADC. A separate CRC based on the register map is used to detect register map changes after the initial register data are loaded.
The serial interface consists of four lines: CS, SCLK, SDI, and SDO/DRDY. The interface operates in the peripheral mode (passive) where SCLK is driven by the host. The interface is compatible to SPI mode 1 (CPOL = 0 and CPHA = 1). In SPI mode 1, SCLK idles low, and data are updated on SCLK rising edges and read on SCLK falling edges. The interface supports full-duplex operation, meaning input data and output data can be transmitted simultaneously. The interface also supports daisy-chain connection of multiple ADCs to simplify the SPI connection.