Description:
1. 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. It can also be connected to a bar graph display or 64 separate LEDs.
2. It includes an on-chip B-type BCD encoder, multi-channel scan loop, segment word driver, and an 8*8 static RAM to store each data. Only one external register is used to set the segment current of each LED.
3. A convenient four-wire serial interface can be connected to all common microprocessors. Each data can be addressed without any need to overwrite all displays when updating. The MAX7219 also allows the user to choose whether to encode or not encode each data.
4. The entire device includes a 150μA low-power shutdown mode, analog and digital brightness control, a scan limit register that allows the user to display 1-8 bits of data, and a detection mode that allows all LEDs to illuminate.
5. Only need 3 IO ports to drive 1 dot matrix! No flicker when the dot matrix is displayed! Support cascading!
6. Module with input and output interface, support multiple modules cascade.
7. With 14 fixing screw holes, 3mm aperture, a single module can drive an 8*8 common cathode array.

Wiring instructions:
1. On the left block to an input port, an output port on the right.
2. When the control of a single module, simply enter the port received a CPU.
3. When more than 3 modules cascaded output input termination CPU, the input output termination module of the first two modules of the first one, the first two modules of the termination input terminal of the three modules, and so on.

Connection:
To 51 single example:
VCC --- 5V
GND --- GND
DIN --- P2.2
CS --- P2.1
CLK --- P2.0

Package Includes:
2pcs MAX7219 32*8 dot matrix module
2pcs 5Pin female-to-female jump wires
2pcs 5P curved pin