MAX7219 is an integrated serial I/O common cathode display driver that connects a microprocessor to an 8-digit 7-segment digital LED display, or to a line graph display or 64 separate LEDs
A single module can drive an 8*8 dot matrix common cathode. An external register is used to set the segment current of each LED with 32 fixed screw holes and a diameter of 3mm
MAX7219 is a convenient four-wire serial interface that connects all common microprocessors. Each data can be addressed without rewriting all the displays when updating. MAX7219 also allows users to select encoding or no encoding for each data
The entire device contains a 150 μ A's low power off mode, analog and digital brightness control, a scan limit register that allows users to display 1-8 bits of data, and a detection mode that enables all LEDs to glow
Only 3 I/O ports are needed to drive 1 lattice; No flicker on dot matrix display; Modules with input and output interfaces support cascading
Description
Product parameter
Operating voltage: 5V
Specification size: 13cmX3.2cmX1.3cm (long X width X height)
With 32 fixing screw holes, aperture 3mm
A single module can drive an 8*8 dot matrix common cathode
A module has input/output interfaces
Instructions
When controlling a single module, you only need to connect the input port to the CPU
When multiple modules are cascaded, the input of the first module connects to the CPU, the output to the input of the second module, the output of the second module to the input of the third module, and so on..
Take 51 single-chip computer as an example:
VCC to 5V
GND to GND
DIN to P2.2
CS to P2.1
CLK to P2.0
