The MAX7219 is an integrated serial input/output common-cathode display driver that connects a microprocessor to an 8-digit digital 7-segment LED display, or a bar graph display or 64 separate LEDs.A single module can drive a 8x8 dot matrix common cathode. It included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8x8 static RAM that stores each digit. Operating Voltage: 5V;Dimensions: 12.8x3.2x1.3cm Only one external resistor is required to set the segment current for all LEDs. A convenient 3-wire serial interface connects to all common µPs. Individual digits may be addressed and updated without rewriting the entire display. The devices include a 150µA low-power shutdown mode, analog and digital brightness control, a scan limit register that allows the user to display from 1 to 8 digits, and a test mode that forces all LEDs on.

Features:

1.10MHz Serial Interface

2. Individual LED Segment Control

3. Decode/No-Decode Digit Selection

4. 150µA Low-Power Shutdown (Data Retained)

5. Digital and Analog Brightness Control

6. Display Blanked on Power-Up

7. Drive Common-Cathode LED Display

8. 24-Pin DIP and SO Packages

Parameters:

1. A single module can drive a total of 8 * 8 dot matrix overcast

2. Working voltage: 5V

3. Size: *12.8 cm*3.2 cm *1.3 cm (L*W*H)

4. With 64 fixing screw holes, diameter 3mm

5. module with input and output interfaces, support for cascading multiple modules

Wiring instructions:

1. The left side of the module is the input port, and the right side is the output port.

2. When controlling a single module, you only need to connect the input port to the CPU.

3. When multiple modules are cascaded, the input of the first module is connected to the CPU, the output

is connected to the input of the second module, the output of the second module is connected to the input

of the third module, and so on.

Take 51 MCU as an example:

VCC → 5V;GND → GND;DIN → P2.2;CS → P2.1;CLK → P2.0

Package included:

3 x dot matrix module

3 x 5 Pin DuPont line