MAX7219 8-Digit LED Display Drivers

The MAX7219 is a 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 8x8 static RAM that stores 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 LED Display Driver 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. 

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Features of MAX7219 Display Driver

• 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)

• 24-Pin DIP and SO Packages

Applications of MAX7219

• Bar-Graph Displays

• Industrial Controllers

• Panel Meters

• LED Matrix Displays