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MAXREFDES99#: MAX7219 Display Driver Shield
Overview
Maxim's MAXREFDES99# is an Arduino
LED array for signage applications. This design is ideal for anyone developing a
display application. The board features Maxim's MAX7219, a legendary LED driver
that simplifies the process of controlling multiple LEDs in matrix or numeric display
form. In MAXREFDES99#, four MAX7219 ICs are daisy chained to drive a full 256-
LED array, which can display any international alpha numeric symbol. The board
arrives complete with four 8x8 LED displays.
Code for the MAXREFDES99# is available on both Arduino and
®
™
ARM
mbed
platforms for quick prototyping with multiple platform boards. System
demonstrations include the display of ASCII characters 'SPACE' through '~' and
writing/scrolling string messages. Developers are encouraged to build upon and
enhance the code base.
Features
• Flexible 16x16 Dot Matrix Display
• mbed.org library
• Arduino library
• Arduino form-factor shield
Competitive Advantages
• Portable
• Compact
• Flexible
• Cost Effective
Applications
• Displays
• Consumers
• Robotics
®
form-factor shield which drives a 16x16
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Table of Contents
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Summary of Contents for Maxim Integrated MAXREFDES99
- Page 1 The board features Maxim’s MAX7219, a legendary LED driver that simplifies the process of controlling multiple LEDs in matrix or numeric display form. In MAXREFDES99#, four MAX7219 ICs are daisy chained to drive a full 256- LED array, which can display any international alpha numeric symbol. The board arrives complete with four 8x8 LED displays.
- Page 2 MAX7219. 16x16 displays, in contrast, provide the capability to display most international alpha-numeric characters. Enter the MAXREFDES99#, which drives a 16x16 display, making it a powerful tool for prototyping and developing applications.
- Page 3 Detailed Description of Hardware See Figure 1 for a block diagram of MAXREFDES99#. MAXREFDES99# can be powered from a wall-wart which provides a minimum of 7W of power and an output voltage in the range of 7.5VDC to 12VDC. 7W is enough power for the display, plus the microcontroller platform being used through the VIN pin of the target platform.
- Page 4 Detailed Description of Firmware Libraries have been developed for both Arduino platforms and the online development environment mbed.org which supports microcontrollers from several ® manufacturers of ARM Cortex -M microcontrollers. The source code for these libraries and their corresponding 'Hello World' demo programs can be found in the design files, or at the following links.
- Page 5 The reference design is fully assembled and tested. Follow the steps below to verify board operation. 1. Connect MAXREFDES99# to your platform. 2. Connect wall-wart to J1 of MAXREFDES99# 3. Connect USB cable from the PC to your platform. 4. Follow the appropriate instructions below: 1.
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