The MAX7221/MAX7219 LED Dot Matrix Screen Module 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 8×8 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 allows the user to select code 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 the 3V operation or segment blinking, refer to the MAX6951 data sheet.


  1. Support SPI interface B/B+ involved in Raspberry Pi
  2. Driver chip: MAX 7219
  3. Dot matrix type: 8×8 common negative red dot matrix


Pin number



1  17 3.3V Input
2  4 5V Input
3   5  7  8   10  11 12  13  15 16  18  21  22 26 NC NC
6   9  14   20   25 GND Power
19 MOSI data input
23 SCK Clock signal
24 CE0 Chip select signal


Package Includes:

  • 1 x  MAX7219 LED Dot Matrix Screen Module



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