MAX7219 LED dot Matrix 8×8 module common cathode

Description

MAX7219 LED dot Matrix module is very easy to use. In addition, it is compatible with a number of microcontrollers including Arduino. The micro-controllers can be connected to this module using the 4-wire serial interface. Moreover, it only needs three i/o data lines, and two power lines to drive.

MAX7219 is an integrated serial input / output common-cathode display drivers , which connects the microprocessor 7-segment digital LED display with 8 digits , bar graph can also be connected monitor or 64 separate LED. On type B BCD encoder includes an on-chip , multi-channel scanning loop , segment word drive, but also a 8×8 static RAM for storing each data . Only one external register is used to set the segment current for each LED .

Working

A convenient four-wire serial interface can connect all common microprocessor. Each data can be addressed in the update does not overwrite all of the display . MAX7219 also allows the user to select each of the data code or not coded .
The entire device includes a 150A low-power shutdown mode , analog and digital brightness control , a scan-limit register allows the user to 1-8 bits of data , there is an LED light so that all the detection mode .

Requires only three IO ports can drive a dot ! No flashing dot matrix display ! Support cascade !

Module Parameters:

• Single module can drive a common cathode 8 * 8 dot matrix
• Module Operating voltage of 5V
• Module size : 5 cm X 3.2 cm wide X 1.5 cm high
• holes with four screws , diameter 3mm, can be fixed by using our M3 studs
• modules with input and output interfaces , support for cascading multiple modules

Wiring:

1 is a block left input port, an output port on the right .

2 When control of a single module , simply input port receiving CPU

When cascading multiple modules 3 , output and input termination CPU, the input output termination module of the first two modules of the first one , the first two modules of terminating the input of the first three modules , and so on .

To 51 single example:

VCC 5V

GND GND

DIN P22

CS P21