MAX7219 LED Matrix Driver

The MAX7219CNG is a compact, serial input/output common-cathode display driver that can interface microprocessors 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 8x8 static RAM that stores each digit. Communication with the MAX7219 is achieved through a convenient 4-wire serial interface (supports SPI). Individual digits may be addressed and updated without rewriting the entire display. Only one external resistor is required to set the segment current for all LEDs. The IC also includes a 150?A 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.

Technical Specification

• 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