Description MAX7219 is an integrated serial input / output common-cathode display driver , which connects a microprocessor and an 8 -digit 7- segment digital LED display, and can also be connected to a bar graph display or 64 independent LEDs . It includes an on-chip B -type BCD encoder, multiple scan loops, segment word drivers, and an 8*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 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. It requires only 3 Ge IO ports to drive 1 dot matrix! No flicker during dot matrix display! Support cascading! Module parameters: 1. A single module can drive an 8*8 common cathode matrix2. Module working voltage: 5V3. Module size: length 12.8 cm X width 3.2 cm X height 1.3 cm4. With 64 fixing screw holes, 3mm diameter5. Module with input and output interface, support multiple module cascade 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 CPU3. When the plurality of cascaded modules, the first one input termination module to the CPU , the output end of the two input module, the first two output termination module of 3 input modules, and so forth . .. Take 51 single chip microcomputer as an example: VCC → 5V GND → GND DIN → P2.2 CS → P2.1 CLK → P2.0
