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Table of Contents

Introduction

Digital I/O Wildcard Hardware

Connecting To Mosaic Controller

Selecting the Digital I/O Wildcard Address

Current Capability of the Digital Output Lines

Protecting the Input and Output Pins

Connecting to the Field Header

Digital I/O Wildcard Software

Setting the Direction of the I/O Lines

C Code to initialize the Digital I/O Wildcard

Forth Code to initialize the Digital I/O Wildcard

Controlling the I/O Lines

C Code to control the Digital I/O Wildcard

Forth Code to control the Digital I/O Wildcard

Digital I/O Wildcard Schematics (pdf)

Digital I/O Wildcard User Guide

Introduction

digital I/O expansion module

This document describes how to use the Digital I/O Wildcard, providing an overview of the hardware and software and a schematic.

This tiny 2" by 2.5" module is a member of the Wildcard™ series that connects directly to Mosaic embedded controllers.

The Digital I/O Wildcard allows you to easily add up to 20 lines of digital I/O to your system. It can be used to expand the I/O of any of Mosaicís controller products. The following sections guide you through the Digital I/O Wildcardís hardware and software.



Table 1-1 Digital I/O Wildcard Specifications

Channels
Configurable Channels: 16, configurable as input or output in groups of 4
Fixed Input Channels: 4
Inputs
Input Voltage Range: 0 - 5 V ( -0.5 to 5.5 absolute max)
Input Low Voltage: < 0.80 V
Input High Voltage: > 2.0 V
Input Leakage Current: ± 10 uA
Outputs
Output Voltage Range: 0 - 5 V ( -0.5 to 5.5 absolute max)
Output Low Voltage: < 0.5 V at 24 mA
Output High Voltage: > 3.5 V typ., 5.0 V pulled up, > 2.4 V at -4.0 mA
Output Current: 24 mA sink, 4 mA source
Pull up/down
Optional Pull-up/down: 10 KOhm, jumper selectable pull up/down

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