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 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.
- Support SPI interface B/B+ involved in Raspberry Pi
- Driver chip: MAX 7219
- Dot matrix type: 8x8 common negative red dot matrix
Description1 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
- 1x MAX7219 LED Dot Matrix Screen Module For Arduino Raspberry Pi B/ B+