Description

The MAX7219 is an integrated serial input/output common-cathode display driver that connects a microprocessor with an 8-digit 7-segment digital LED display, as well as a bar graph display or 64 individual LEDs. It includes an on-chip B-type BCD encoder, multiple scan loops, segment word drivers, and an 8*8 static RAM for storing each data. There is only one external register used to set the segment current for each LED. A convenient four-wire serial interface connects all common microprocessors. Each data can be addressed when updated without overwriting all displays. The MAX7219 also allows the user to choose to encode or not encode each data. The entire device contains a 150µA low-power shutdown mode, analog and digital brightness controls, a scan limit register that allows the user to display 1-8 bits of data, and a detection mode that turns all LEDs on. Only 3 IO ports are needed to drive 1 dot matrix! Dot matrix display without flicker! Cascading is supported! Module parameters: 1. A single module can drive an 8*8 common cathode lattice 2. Module working voltage: 5V 3. Module size: length 12.8cm X width 3.2cm X height 1.3cm 4. With 64 fixing screw holes, the hole diameter is 3mm 5. The module has an input and output interface, supporting multiple modules 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 CPU 3. When multiple modules are cascaded, the input terminal of one module is connected to the CPU, the output terminal is connected to the input terminal of the second module, the output terminal of the second module is connected to the input terminal of the third module, and so on. . Take 51 microcontroller as an example: VCC → 5V GND → GND DIN → P2.2 CS → P2.1 CLK → P2.0