This product is an integrated serial input/output common-cathode display driver that connects a microprocessor to an 8-bit digital 7-segment LED display. It can also be connected to a bar graph display or 64 separate LEDs. It includes an on-chip B-type BCD encoder, multi-channel scan loop, segment word driver, and an 8 x 8 static RAM to store each data. Only one external register is used to set the segment current of each LED. 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. It also allows the user to choose whether to encode or not encode each data. 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. Only need 3 IO ports to drive 1 dot matrix! No flicker when the dot matrix is displayed! Support cascading! Features: An 8 x 8 common cathode dot matrix can be driven by a single module. With 4 fixing screw holes and 3mm aperture, it can be fixed with our M3 copper column. The module comes with an input and output interface, supporting multiple module cascades. It can also be connected to a bar graph display or 64 separate LEDs. Each data can be addressed without any need to overwrite all displays when updating. Specification: Module Working Voltage: 5V Module Size: Approx. 5 x 3.2 x 1.5cm / 2.0 x 1.3 x 0.6in 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 - P22 CS - P21 CLK - P20 Package List: 1 x for PCB board 1 x 8 x 8 Common Cathode Red Dot Matrix Module 9 x Accessories Note: VCC and GND cannot be connected inversely, so as not to burn the chip! When using P0 port control of 51 single-chip microcomputer, resistance must be connected, and the recommended resistance value is 4.7k --10K. Please insert the dot matrix into the round hole seat first, and then insert the round hole seat into the for PCB board for welding. Turn the textured side of the dot matrix towards yourself, starting from left to right in pin order of 123456. The first foot of PCB is a square pad! 1、An 8 x 8 common cathode dot matrix can be driven by a single module. 2、With 4 fixing screw holes and 3mm aperture, it can be fixed with our M3 copper column. 3、The module comes with an input and output interface, supporting multiple module cascades. 4、It can also be connected to a bar graph display or 64 separate LEDs. 5、Each data can be addressed without any need to overwrite all displays when updating.