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MAX7221

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Serially Interfaced, 8-Digit, LED Display Drivers

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Product Details

Key Features

Applications/Uses

Simplified Block Diagram

Technical Docs

Data Sheet Serially Interfaced, 8-Digit, LED Display Drivers Aug 29, 2003
App Note Data Multiplexer Adds Cursor To MAX7219 or MAX7221 LED 7 Segment Display Driver
App Note Migrating from the MAX7219 and MAX7221 to the MAX6950 and MAX6951 LED Drivers
App Note 12-Bit Thermometer Using an 8-Bit µC and Assembler
App Note Multiplexing Shutdown Allows Text to be Displayed
App Note Electronic Displays Comparison
App Note Using the MAX7219/7221 to Drive Higher Voltage or Current
App Note Using Maxim SPI-compatible Display Drivers with other SPI Peripherals
Tutorial LEDs Are Still Popular (and Improving) after All These Years
App Note Using a PC to Experiment with the MAX7219 and MAX7221 LED Display Drivers
App Note One-Wire Network Controls Remote SPI Peripherals
App Note Eliminate Noise Through Proper Supply Bypass Filtering

Support & Training

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Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

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

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.

Simplified Block Diagram

MAX7219, MAX7221: Typical Application Circuit MAX7219, MAX7221: Typical Application Circuit Zoom icon

Technical Docs

Data Sheet Serially Interfaced, 8-Digit, LED Display Drivers Aug 29, 2003
App Note Data Multiplexer Adds Cursor To MAX7219 or MAX7221 LED 7 Segment Display Driver
App Note Migrating from the MAX7219 and MAX7221 to the MAX6950 and MAX6951 LED Drivers
App Note 12-Bit Thermometer Using an 8-Bit µC and Assembler
App Note Multiplexing Shutdown Allows Text to be Displayed
App Note Electronic Displays Comparison
App Note Using the MAX7219/7221 to Drive Higher Voltage or Current
App Note Using Maxim SPI-compatible Display Drivers with other SPI Peripherals
Tutorial LEDs Are Still Popular (and Improving) after All These Years
App Note Using a PC to Experiment with the MAX7219 and MAX7221 LED Display Drivers
App Note One-Wire Network Controls Remote SPI Peripherals
App Note Eliminate Noise Through Proper Supply Bypass Filtering

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .