Display Driver Controller 64 LED Matrix or 8 Digits MAX7219
The MAX7219/MAX7221 are serial common-cathode display drivers that interface between microcontrollers and 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs. MAX7219 includes brightness control and shutdown mode.
The MAX7219/MAX7221 are compact serial input/output common-cathode display drivers that provide the interface between microprocessors (µPs) and 7-segment numeric LED displays of up to 8 digits 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 to store 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 codeB 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, see the MAX6951 datasheet.
C++ Library Code for MAX7219, MAX7221 LED Display Drivers Sensor
C code for the MAX7219, MAX7221
Pinouts for MAX7219, MAX7221
Typical Application Circuit
- Using a PC to Experiment with the MAX7219 and MAX7221 LED Display Drivers
- Using the MAX6951/MAX6950 LED Display Drivers with SPI Interface to Communicate with the MAXQ2000 Microcontroller, Assembly Language
- Charlieplexing - Reduced Pin-Count LED Display Multiplexing
- Feature comparison for MAX7219, MAX7221, MAX6950, MAX6951 LED Drivers
- LEDs Are Still Popular (and Improving) after All These Years