Features and Benefits
- 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
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.
- Bar Graph Displays
- Industrial Controllers
- LED Matrix Displays
- Panel Meters
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
MAX7221 Reliability Data1/12/2023111K
Electronic Displays Comparison9/9/2002
Using a PC to Experiment with the MAX7219 and MAX7221 LED Display Drivers12/29/2003
LEDs Are Still Popular (and Improving) after All These Years2/25/2003
Using Analog Devices SPI-compatible Display Drivers with other SPI Peripherals2/10/2003
Using the MAX7219/7221 to Drive Higher Voltage or Current9/9/2002
Migrating from the MAX7219 and MAX7221 to the MAX6950 and MAX6951 LED Drivers7/17/2002
Data Multiplexer Adds Cursor To MAX7219 or MAX7221 LED 7 Segment Display Driver6/4/2002
12-Bit Thermometer Using an 8-Bit µC and Assembler12/28/2001
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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