Connecting the Digilent PmodAD1 Digital Converter Expansion Module to your host board involves understanding its pinout, power requirements, and communication protocol. First, identify the pin configuration: The PmodAD1 features two headers, J1 and J2. Header J1 includes pins for Chip Select (CS), Input Data 1 (D0), Input Data 2 (D1), Serial Clock (SCK), Ground (GND), and Power Supply (VCC). Header J2 includes pins for Input Data 1 (A0), Ground (GND), Input Data 2 (A1), Ground (GND), Ground (GND), and Positive Power Supply (VCC). Ensure the power supply voltage applied to the PmodAD1 is within the range of 2.35 to 5.25 volts to ensure proper functionality. The PmodAD1 uses an SPI-like communication protocol. Data lines (MOSI and MISO) function as Master-In-Slave-Out lines. The module provides 12 bits of information over 16 clock cycles. The first four bits are leading zeroes. The remaining 12 bits represent the data, with the Most Significant Bit (MSB) first. The first leading zero is clocked out on the falling edge of the Chip Select (CS) signal, while subsequent bits are clocked out on the falling edge of the Serial Clock (SCK) signal. Note that the pin header spacing is 100 mil, and the PCB dimensions are 0.95 inches long (parallel to the pins) and 0.80 inches long (perpendicular to the pin header). By following these steps and consulting the Digilent PmodAD1 manual, you can successfully integrate the module with your host board for accurate analog-to-digital conversion.
