Hello friends! Welcome back to ElectroDuino. This blog is base on MAX7219 – 8X8 LED Dot Matrix Display | How MAX7219 – 8X8 LED Dot Matrix Display Works. Here we will discuss the introduction 8X8 LED Matrix Display module, pin diagram/pinout, module hardware overview, How it’s Works, its Specifications, and applications.
An 8×8 dot led matrix is a very interesting display module which can print characters using LEDs or a group of LEDs. Another most interesting thing about it is the cheap price, easily available in the market, and easy to interface with microcontrollers. In the display, LEDs are arranged in 8 columns and 8 rows. So it is consists of 8×8 = 64 LED. It’s very difficult to control 64 LEDs by a microcontroller or microprocessor. So this display comes with a controller IC MAX7219. The MAX7219 is a common cathode display driver IC with serial input and parallel output. Which is make the display easier to control.
MAX7219 – 8X8 LED Dot Matrix Display Module Pin Diagram
|Pin No||Pin Name||Input Pin Description||Output Pin Description|
|1||VCC||Connect to + 5v power supply|
If we want to connect more than one module we just connect the output pins of the previous display board to the input pins of the new module.
|2||GND||Connect to the ground of power supply|
|3||DIN||This is a data input pin. Connect to the microcontroller I/O pin to providing data to display.|
|4||CS||This Chip-Select Input. It allows chip activation.|
|5||CLK||This is a Serial-Clock Input pin. Connect to the microcontroller I/O pin to providing clock input to display.|
MAX7219 – 8X8 LED Dot Matrix Display Module Hardware Overview
This Display Module consists of two main components, one is 8 x 8 LED matrix display and MAX7219 display driver IC.
8 x 8 LED Dot Matrix Display
These matrix display modules are made of 1088AS 8×8 led dot matrix. It has 8 rows of LED and 8 columns of LED, so it has a total of 8×8 =64 numbers of LED. This matrix has the LEDs anodes are connected across rows (8 pins) and the LEDs cathodes are connected across columns (8 pins each). So this display has total of 16 pins to control the LEDs.
MAX7219 Display Driver IC
The MAX7219 driver IC input interface is a 16-bit serial input shift register. It is a 24-pin IC available in different packages. This IC is basically used to convert serial data to parallel data. The MAX7219 are compact, serial input/output common-cathode display drivers that easy to interface with microcontrollers for control 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs. Included on the MAX7219 chip is a BCD code-B decoder, a multiplex scan circuitry, a segment and digit drivers and an 8×8 static RAM that stores each digit. Only one external resistor is required to set the segment current for all LEDs. This MAX7219 driver IC can control 64 LEDs using only 3 pins of a microcontroller or microprocessor. So this IC is used to reduce I/O pin usage of microcontroller or microprocessor.
|Input Voltage||3.7 to 5.3 V|
|Input Current||320 mA|
|8×8 matrix wavelength||625 ~ 630nm|
|Display Dimensions||32x32x6 (LxWxH) mm|
|PCD Dimensions||50×32 (LxW) mm|
- OUTDOOR displays
- POSTER display.
- PIXEL gaming.
- Character design.
- Electronic, DIY projects.