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MAX7219CNG 7 Segment Driver IC

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  • Image 1
  • Typical connections to Arduino and to common cathode 4 digit 7 segment LED Display 
from MAXIM MAX7219CNG. 
LED Display Pin 1 is normally bottom left
  • Typical 4 digit display pinout
Maxim IC
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 Product Description

MAX7219CNG 7 Segment Driver IC

Highly convenient 7-segment driver IC for Arduino or any other microcontroller with SPI interface.

The MAX7219/MAX7221 are compact, serial input/out- put common-cathode display drivers that interface microprocessors (μPs) to 7-segment numeric LED dis- plays of up to 8 digits, bar-graph displays, or 64 indi- vidual LEDs. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8x8 static RAM that stores each digit. Only one external resistor is required to set the seg- ment current for all LEDs. The MAX7221 is compatible with SPITM, QSPITM, and MICROWIRETM, and has slew- rate-limited segment drivers to reduce EMI.

A convenient 4-wire serial interface connects to all common μPs. Individual digits may be addressed and updated without rewriting the entire display. The MAX7219/MAX7221 also allow the user to select code- B decoding or no-decode for each digit.

The devices include a 150μA low-power shutdown mode, analog and digital brightness control, a scan- limit register that allows the user to display from 1 to 8 digits, and a test mode that forces all LEDs on.

For applications requiring 3V operation or segment blinking, refer to the MAX6951 data sheet.


  • 10MHz Serial Interface
  • Individual LED Segment Control
  • Decode/No-Decode Digit Selection
  • 150μA Low-Power Shutdown (Data Retained)
  • Digital and Analog Brightness Control
  • Display Blanked on Power-Up
  • Drive Common-Cathode LED Display
  • Slew-Rate Limited Segment Drivers for Lower EMI (MAX7221)
  • SPI, QSPI, MICROWIRE Serial Interface (MAX7221)

Arduino library can be found here.

 Product Videos

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