Serially Interfaced, 8-Digit, LED Display Drivers
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.
- 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
- Bar Graph Displays
- Industrial Controllers
- LED Matrix Displays
- Panel Meters
Technical DocumentsApp Note 2782 Using a PC to Experiment with the MAX7219 and MAX7221 LED Display Drivers
Tutorial 1883 LEDs Are Still Popular (and Improving) after All These Years
App Note 1196 Using the MAX7219/7221 to Drive Higher Voltage or Current
App Note 1193 Electronic Displays Comparison
App Note 876 Migrating from the MAX7219 and MAX7221 to the MAX6950 and MAX6951 LED Drivers
App Note 141 Data Multiplexer Adds Cursor To MAX7219 or MAX7221 LED 7 Segment Display Driver
|Device||Fab Process||Technology||Sample size||Rejects||FIT at 25°C||FIT at 55°C||Material Composition|
|App Note||2782||Using a PC to Experiment with the MAX7219 and MAX7221 LED Display Drivers|
|Tutorial||1883||LEDs Are Still Popular (and Improving) after All These Years|
|App Note||1196||Using the MAX7219/7221 to Drive Higher Voltage or Current|
|App Note||1193||Electronic Displays Comparison|
|App Note||876||Migrating from the MAX7219 and MAX7221 to the MAX6950 and MAX6951 LED Drivers|
|App Note||141||Data Multiplexer Adds Cursor To MAX7219 or MAX7221 LED 7 Segment Display Driver|