PI-SPI-DIN-4AO Raspberry Pi Analog Output I/O Module

This is the DIN rail mountable version of the PI-SPI-2AO Analog Input Interface! The PI-SPI-DIN-4AO Analog Output I/O Module is based on the Microchip MCP4728 12 bit D/A converter with the I2C Interface.

The MCP4728 can have up to 8 programmable I2C addresses allowing 8 PI-SPI-DIN-4AO's to be daisy chained together for a total of 32 analog outputs.

Each output channel has jumper selections for:
4-20 mA, 0 to 5 VDC or 0 to 10 VDC output.

Each channel has jumper selections to power the output circuit from the internal field voltage applied to the main PI-SPI-DIN module, OR from the applied voltage to the output channel terminal block.

Each module in the PI-SPI-DIN series has two 16b Pin GPIO ports that carry power, SPI, I2C and 5 Chip Selects from the main PI-SPI-DIN-RTC-RS485 Module. Also, each module has it's own 5VDC switching power supply and 3.3VDC LDO regulator.

Specifications:

• Two 16 Pin GPIO Ports (Power, SPI, I2C and 5 Chip Selects)
• 5 VDC 0.5A Switching Power Supply (9 to 24 VDC Input)
• 3.3VDC LDO regulator
• Terminal Blocks are rising clamp cage screw type (no leaf springs)
• Blue LED indicator for power
• MCP4728 A/D Converter with 12 bit resolution
• I2C Interface with buffering
• I2C Address Range 0x60 to 0x67
• Analog output drive at 24 VDC field power is 1000 Ohms
• Analog Output jumper selectable 4-20 mA, 0 to 5 VDC or 0 to 10 VDC
• Output Channel Power jumper selectable from main module or applied field power to terminal block
• Each output circuit has a signal strength LED
• PCB Dimensions: 2.7" Wide x 3.42" Long

Mounting Styles:

Each PI-SPI-DIN I/O Module has three mounting styles available:

• PCB on Spacers
• DIN rail Clips
• DIN rail Enclosure

PI-SPI-DIN-4AO Accessories :

All PI-SPI-DIN I/O Modules come complete with interconnect ribbon cables and all necessary hardware based on enclosure style.

Typical Application with pcb DIN clip mounting:

Node-RED

The PI-SPI-DIN Series of I/O Modules now have Node-RED support. Please visit

Node-RED and the PI-SPI-DIN Series

for instructions.

Block Diagram

Address Programming

To re-program the I2C address of the PI-SPI-DIN-4AO, please read the application note:

PI-SPI-DIN-4AO Address Programming

PI-SPI-DIN-4AO GPIO Connector

PI-SPI-DIN Series Raspberry Pi GPIO Mapping

Downloads

PI-SPI-DIN-4AO Schematic

PI-SPI-DIN-4AO PCB Layout

For Python Sample Code, please visit:

PI-SPI-DIN-4AO Python Code Samples

Basic Python "Write" Analog Output D/A Counts Program:

from time import sleep
from widgetlords.pi_spi_din import *

init()
outputs = Mod4AO()

while True:
    outputs.write_single(0, 800)    # 4 mA
    outputs.write_single(1, 800)    # 4 mA
    outputs.write_single(2, 4000)   # 20 mA
    outputs.write_single(3, 4000)   # 20 mA
    sleep(2)