General Description

The MAX7219/MAX7221 are 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.

Features

♦ 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

   Bar-Graph Displays

   7-Segment Displays

   Industrial Controllers

   Panel Meters

   LED Matrix Displays