MAX7219

Serially Interfaced, 8-Digit, LED Display Drivers


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.

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 code-B 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, refer to the MAX6951 data sheet.
MAX7219, MAX7221: Typical Application Circuit MAX7219, MAX7221: Typical Application Circuit Enlarge+

Key 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/Uses

  • Bar Graph Displays
  • Industrial Controllers
  • LED Matrix Displays
  • Panel Meters
Part Number LCD or LED Digits or Char. Output Format Display Type Interface Fonts VSUPPLY
(V)
VSUPPLY
(V)
Package/Pins Budgetary
Price
min max See Notes
MAX7219  LED 8-Digit 7 segment + DP Common Cathode Serial 3-Wire 10Mbit Code B 4 5.5
CDIP(N)/24
PDIP(N)/24
SOIC(W)/24
$5.38 @1k
MAX7221  Serial SPI 10Mbit
CDIP(N)/24
PDIP(N)/24
SOIC(W)/24
$5.54 @1k
See All Display Drivers (48)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Related Resources