Display Driver Controller 64 LED Matrix or 8 Digits MAX7219

The MAX7219/MAX7221 are serial common-cathode display drivers that interface between microcontrollers and 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs. MAX7219 includes brightness control and shutdown mode.


The MAX7219/MAX7221 are compact serial input/output common-cathode display drivers that provide the interface between microprocessors (µPs) and 7-segment numeric LED displays of up to 8 digits or 64 individual LEDs. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8x8 static RAM to store each digit. Only one external resistor is required to set the segment current for all LEDs. The MAX7221 is compatible with SPI™, QSPI™, and MICROWIRE™, 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 codeB 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, see the MAX6951 datasheet.


MAX7219/MAX7221 DataSheet

C++ Library Code for MAX7219, MAX7221 LED Display Drivers Sensor

Import libraryMAX7219

Library for the MAX7219 LED display driver

C code for the MAX7219, MAX7221

MAX7219.c and MAX7219.h

Pinouts for MAX7219, MAX7221


Typical Application Circuit


Application Notes

Product Pages

Where to Buy

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