ZHCSDS3C May 2015 – April 2018 ADS52J90
PRODUCTION DATA.
Several different modes can be programmed with the serial peripheral interface (SPI). This interface is formed by the SEN (serial interface enable), SCLK (serial interface clock), SDIN (serial interface data), and RESET pins. The SCLK, SDIN, and RESET pins have a 20-kΩ pulldown resistor to ground. SEN has a 20-kΩ pullup resistor to supply. Serially shifting bits into the device is enabled when SEN is low. SDIN serial data are latched at every SCLK rising edge when SEN is active (low). SDIN serial data are loaded into the register at every 24th SCLK rising edge when SEN is low. If the word length exceeds a multiple of 24 bits, the excess bits are ignored. Data can be loaded in multiples of 24-bit words within a single active SEN pulse (an internal counter counts the number of 24 clock groups after the SEN falling edge). Data is divided into two main portions: the register address (8 bits) and data (16 bits). Figure 92 shows the timing diagram for serial interface write operation.