MAX7219 is an integrated serial input/output common-cathode display driver. It connects a microprocessor and an 8-digit 7-segment digital LED display. It can also be connected to a bar graph display or 64 independent LEDs. A single module can Drive an 8*8 common cathode dot matrix, which includes an on-chip B-type BCD encoder, multiple scan loops, segment word drivers, and an 8*8 static RAM to store each data. There is only one external register for setting the segment current of each LED, and 32 fixing screw holes with a 3mm diameter.
A convenient four-wire serial interface can be connected to all general-purpose microprocessors. Each data can be addressed without rewriting all the displays when updating. MAX7219 also allows users to select encoding or not encoding for each data.
The entire device includes a 150μA low-power shutdown mode, analog and digital brightness control, a scan limit register allowing users to display 1-8 bits of data, and a detection mode to make all LEDs glow. Only 3 IO ports can drive 1 dot matrix! No flicker during dot matrix display! The module has input and output interfaces and supports cascading!
This product has 4 Dot Matrix LED’s cascaded to form a single LED Display to allot more area to the user on the display.
Connecting the two modules is also very easy. Only connect the output pins of the previous breakout board to the input pins of the new module, thus with such arrangement, you can connect as many DOT LED Modules to the Arduino as you wish!!! Great……
The MAX7219 Dot Led Matrix Module is a serial input common-cathode driver that interfaces micro-controllers to LED matrices. All common micro-controllers can be connected to this module by using a 4-wire serial interface. Each output can be addressed without refreshing the entire display. This module requires only 3 I/O lines for driving the display, making it ideal for your microcontroller projects. Only one external register is used to set the segment current of each LED.
Requires only three IO ports can drive a dot! No flashing dot matrix display! Support cascade!
Dot LED Module to the Arduino
Vcc – 5V
GND – GND
DIN – Pin 12
CS – Pin 10
CLK – Pin 11