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MAX7219 8 Digit LED Display Driver Overview [Video]

Author: Mia Date: 16 Jan 2021  35

max7219 arduino

The MAX7219 is an IC designed to control 8x8 LED MATRIX. The IC is a serial input common-cathode (Common Negative) display driver that interfaces microprocessors (or microcontrollers) to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs.

This blog is an overview of MAX7219 covering its pinout, features, where and how to use this device, etc.

Arduino 7 Segment Display Max7219 Tutorial


Catalog

MAX7912 Pin Configuration

MAX7912 Features

MAX7912 Equivalent

Where to Use MAX7912 IC

How to Use Max7912 IC

MAX7912 Applications

MAX7912 Dimensions

Component Datasheet

 


MAX7912 Pin Configuration

max7219 MAX7219 Pinout

MAX7219

MAX7219 PINOUT

 

Pin Number Description
COMMON CATHODE OF DISPLAY SEGMENTS
2 DIG0- Common ground for all eight segments of DIGIT0
11 DIG1- Common ground for all eight segments of DIGIT1
6 DIG2- Common ground for all eight segments of DIGIT2
7 DIG3- Common ground for all eight segments of DIGIT3
3 DIG4- Common ground for all eight segments of DIGIT4
10 DIG5- Common ground for all eight segments of DIGIT5
5 DIG6- Common ground for all eight segments of DIGIT6
8 DIG7- Common ground for all eight segments of DIGIT7
SHARED TERMINALS
4 GND
19 V+- Power Supply
SHARED SEGMENT TERMINAL OF ALL EIGHT DIGITS
14 SEG A – SEGEMTENT A  of all DIGITS
16 SEG B – SEGEMTENT B  of all DIGITS
20 SEG C – SEGEMTENT C  of all DIGITS
23 SEG D – SEGEMTENT D  of all DIGITS
21 SEG E – SEGEMTENT E  of all DIGITS
15 SEG F – SEGEMTENT F  of all DIGITS
17 SEG G – SEGEMTENT G  of all DIGITS
22 SEG DP – SEGEMTENT DOT of all DIGITS
FUNCTION PINS
1 DIN -  Serial Data Input Pin
12 LOAD(CS) – Chip Select or Data shift pin
13 CLK -  Clock Pin
24 DOUT -  Pin used to Connect Second chip serially
18 ISET -  current output adjust pin

 


MAX7912 Features

  • Operating voltage range: +4.0 to +5.5V

  • Recommended operating voltage: +5V

  • Maximum supply voltage: 6V

  • Maximum current allowed to draw through each segment pin: 100mA

  • Maximum current allowed to  through each DIGIT ground pin: 500mA

  • Low power consumption

  • Data-to-Segment Delay Time: 2.2mSec

  • Operating temperature: 0°C  to +70°C

  • Storage Temperature: -65°C  to +150°C


MAX7912 Equivalent

74HC595


Where to Use MAX7912 IC

1.This IC is basically used when you want to convert serial data to parallel data.

2.The chip is used to reduce the I/O pin use of the controller or processor.

3. Used for controlling 64 LEDs using only 3 pins

4. Preferred when controller 7 Segment Displays. The chip can control up to 8 DIGIT.

5. Can be used to control more display segments by connecting more chips in serial.


How to Use Max7912 IC

MAX7219  is used in a similar manner to any shift register. First we send the serial data to the chip bit by bit. Once all the data is sent, we tell the chip to move the serial data to the output by enabling the CS pin. The step-by-step working procedure is as follows.

  • First connect the DIN, CS and CLK pins. These three pins are very important for controlling the chip.

  • Next is selecting the resistance for the ISET pin. As we know, there is no standard market parameter for segment displays. They have different voltage and current settings. To drive the display without error, we will use the following table to select the appropriate resistor.

 

Forward voltage
ISeg 1.5V 2.0V 2.5V 3.0V 3.5V
40mA 12.2kΩ 11.8kΩ 11.0kΩ 10.6kΩ 9.69kΩ
30mA 17.8kΩ 17.1kΩ 15.8kΩ 15.0kΩ 14.0kΩ
20mA 29.8kΩ 28.0kΩ 25.9kΩ 24.5kΩ 22.6kΩ
10mA 66.7kΩ 63.7kΩ 59.3kΩ 55.4kΩ 51.2kΩ

 

  • There are two ways to make use of this chip. One is to follow the instructions in the datasheet to send the data bit by bit. The second way is to use the libraries that have already been written for this chip. Using libraries is the easiest way to get the required result. With libraries, you can simply enter the required data to send without worrying about anything.

  • We'll send the data to the chip through the DIN pin. The data is sent bit by bit by setting the chip clock for each bit. The Chip stores the serial data in its registers until all data is received. After completing the data sent, we will set the CS pin for the chip to transfer all the data stored in the register to the output.

  • Once the data is output by the chip, the corresponding LEDs will be illuminated to display the result.


MAX7912 Applications

  • General purpose SHIFT operation

  • Measuring Instruments

  • Digital Electronics

  • Servers

  • Memory units

  • Networking

  • Digital systems


MAX7912 Dimensions

MAX7912 Dimensions

MAX7912 Dimensions


Component Datasheet

MAX7219 LED Display Driver Datasheet

 

Ordering & Quality

Photo Mfr. Part # Company Description Package PDF Qty Pricing
(USD)
MAX7219CNG MAX7219CNG Company:Maxim Integrated Remark:LED Driver 24-PDIP Package:24-DIP (0.300"", 7.62mm)
DataSheet
In Stock:On Order
Inquiry
Price:
46+: $5.43913
Inquiry
MAX7219CNG MAX7219CNG Company:Maxim Integrated Remark:IC DRVR 7 SEGMENT 8 DIGIT 24DIP Package:24-DIP (0.300", 7.62mm)
DataSheet
In Stock:2171
Inquiry
Price:
1+: $8.94000
10+: $8.07400
25+: $7.69800
100+: $6.38390
250+: $5.82060
500+: $5.77364
Inquiry
MAX7219CWG MAX7219CWG Company:Maxim Integrated Remark:LED Driver 24-SOIC Package:24-SOIC (0.295"", 7.50mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
42+: $5.98000
Inquiry
MAX7219CWG MAX7219CWG Company:Maxim Integrated Remark:IC DRVR 7 SEGMNT 8 DIGIT 24SOIC Package:24-SOIC (0.295", 7.50mm Width)
DataSheet
In Stock:1401
Inquiry
Price:
1+: $9.30000
10+: $8.40200
25+: $8.01080
100+: $6.64330
250+: $6.05708
500+: $6.00824
Inquiry

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