MAX7219 Data Sheet – 8 Digit LED Display Driver – Maxim

MAX7219 is compact, serial input/output common-cathode display drivers that interface microprocessors (μPs) to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, 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.

Function :  Serially Interfaced, 8-Digit LED Display Drivers

Package : 24-Pin DIP and SO type

Manufacturer : Maxim Integrated

Pinout and Application Circuit


Ordering Information

MAX7219CNG : 24 Narrow Plastic DIP ( 0°C to +70°C )
MAX7219CWG : 24 Wide SO ( 0°C to +70°C )
MAX7219ENG : 24 Narrow Plastic DIP ( -40°C to +85°C  )
MAX7219EWG : 24 Wide SO ( -40°C to +85°C  )
MAX7219ERG : 24 Narrow CERDIP ( -40°C to +85°C  )



1. 10MHz Serial Interface
2. Individual LED Segment Control
3. Decode/No-Decode Digit Selection
4. 150μA Low-Power Shutdown (Data Retained)
5. Digital and Analog Brightness Control
6. Display Blanked on Power-Up
7. Drive Common-Cathode LED Display


MAX7219 Arduino Reference Sites


Controlling a Led matrix or 7-segment displays with the MAX7219



The module uses two standard 4 digit seven segment displays to display a total of 8 digits in RED with decimal point. A convenient input and output header allows additional modules to be daisy-chained and controlled with just just 3 digital IO pins. To panel mounting the module has 4 mounting holes and 4 brass pillars with screws are supplied.


How to use a MAX7219 LED Dot Matrix with an Arduino. Since these modules use the MAX7219 LED driver chip, we will be able to turn on and off the 64 LEDs of each modules, using only 3 pins on our Arduino. In this tutorial we will connect 2 of them together to display different animations on each one.


MAX7219 Datasheet


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SIM300 – GSM Module – SIMCOM

Part number : SIM300

Function :  GSM Module

Package information : 40mm x 33mm x 2.85 mm

Manufacturer : SIMCOM


SIM300 image


1. Power supply : Single supply voltage 3.4V – 4.5V

2. Power saving : Typical power consumption in SLEEP mode to 2.5mA

3. Frequency bands
(1) SIM300 Tri-band: EGSM 900, DCS 1800, PCS 1900. The band can be set by AT COMMAND, and default band is EGSM 900 and DCS 1800.
(2) Compliant to GSM Phase 2/2+

4. GSM class : Small MS

5. Transmit power
(1) Class 4 (2W) at EGSM900
(2) Class 1 (1W) at DCS1800 and PCS 1900

6. GPRS connectivity
(1) GPRS multi-slot class 10
(2) GPRS mobile station class B


SIM300 datasheet pinout

Functions :

Designed for global market, SIM300 is a Tri-band GSM/GPRS engine that works on frequencies EGSM 900 MHz, DCS 1800 MHz and PCS1900 MHz. SIM300 provides GPRS multi-slot class 10 capability and support the GPRS codingschemes CS-1, CS-2, CS-3 and CS-4. With a tiny configuration of 40mm x 33mm x 2.85 mm , SIM300 can fit almost all the space requirement in your application, such as Smart phone, PDA phone and other mobile device.


SIM300 Datasheet PDF


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