Description:
MAX7219 is an integrated serial input / output common-cathode display drivers, which connects the microprocessor and 8 digit 7-segment digital LED display, you can also connect a bar graph display or 64 separate LED. Includes an on-chip type B BCD encoders, multi-channel scanning loop, segment word driver, but also a 8x8 static RAM that stores each data. Only one external register is used to set the current of each LED segment.
A convenient four-wire serial interface can connect all common microprocessor. Each data can be addressed in the update without rewriting all displays. MAX7219 also allows the user to select each data encoding or no coding.
The entire device includes a 150μA low-power shutdown mode, analog and digital brightness control, a scan-limit register allows the user to display 1-8 bit data, there is an all LED light detection mode.
Only need three IO ports can drive 8 bit digital tube. MAX7219 supports flicker free displays as well as cascading displays.

Connection:
Wiring instructions (a program, for example, you can pick any IO port definition can be modified in the program):
VCC→5V
GND→GND
DIN →P00
CS →P01
CLK→P02

Note:
1. VCC and GND do not reversed, it would burn the chip.
2. 51 MCU P0 port requires pull-up resistor, if your device does not have a pull-up resistor can be connected to other ports data lines.

Package Includes:
MAX7219 digital tube display control module
5P Straight Pin
5P Bent Pin