MAX7219 4-in-1 Display Dot Matrix Module is an integrated serial input/output common-cathode display driver, it connects the microprocessor 7-segment digital LED display with 8 digits, you can also connect a bar graph display or 64 independent LED. Thereon including a B-type BCD encoder chip, multi-channel scanning loop segment word driver, but also a static RAM 8 x 8 for storing each data. Only one external register is used to set the segment current of each LED.

Specifications and Features:-

• Dimensions: 128 x 32  x 1.5mm(LxWxH)(All 4 in 1)
  
• Dimension 32 x 32 x 1.5 mm (LxWxH) (Single Module)
  
• A single module can drive an 8×8 dot matrix common cathode
  
• Operating voltage: 5V
  
• Weight: 55 gm
  
• Fixing screws with 64 holes with a diameter 3mm
  
• Module with input and output interfaces
  
• Support for cascading multiple modules
  

Wiring Instructions:-

The left side of the module to the input port, the right to an output port.

When the control of a single module, simply input port connected to CPU

When a plurality of cascaded modules, input and output termination CPU, an input terminal of the second output end of the first module a module, the first two modules of the input terminal of the three termination modules, and so on..

Pin Description:-

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