SBASB74 October 2024 ADS127L21B
PRODUCTION DATA
The serial interface reads conversion data, configures device registers, and controls ADC conversions. The optional CRC mode validates error-free data transmission between the host and ADC. Additional CRCs validate the register map contents after the register data are loaded.
The serial interface consists of four signals: CS, SCLK, SDI, and SDO/DRDY. The interface operates in 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 are 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.