MAX7219CNG+

Overview

The MAX7219CNG+ is a compact, common-cathode serial input/output display driver that interfaces microprocessors to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs. It features an on-chip BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8x8 static RAM that stores each digit.

Why Choose This Part

This driver eliminates the need for external current-limiting resistors by providing a single external resistor to set the segment current for all LEDs. Its 10MHz SPI-compatible serial interface allows for high-speed updates while minimizing the pin count required from the host microcontroller.

Applications

Getting Started

To begin, connect the MAX7219 to your microcontroller via a 4-wire serial interface (DIN, CLK, LOAD, and GND) and provide a 4V to 5.5V supply. Ensure a 10uF electrolytic capacitor and a 0.1uF ceramic capacitor are placed close to the V+ pin to manage switching transients. Numerous open-source libraries, such as the LedControl library for Arduino, are available to simplify initialization and digit mapping.