The MAX7219 is an SPI-controlled LED display driver that can drive up to 64 individual LEDs or an 8×8 LED matrix or eight 7-segment displays. Multiple drivers can be daisy-chained. Used in LED matrix scrolling displays.
| Pin | Name | Function | Type |
|---|---|---|---|
| 1 | DIN | SPI data input | BUS |
| 2 | DIG0 | Digit 0 cathode driver | I/O |
| 3 | DIG4 | Digit 4 cathode driver | I/O |
| 4 | GND | Ground | GND |
| 5 | DIG6 | Digit 6 cathode driver | I/O |
| 6 | DIG2 | Digit 2 cathode driver | I/O |
| 7 | DIG3 | Digit 3 cathode driver | I/O |
| 8 | DIG7 | Digit 7 cathode driver | I/O |
| 9 | GND | Ground | GND |
| 10 | DIG5 | Digit 5 cathode driver | I/O |
| 11 | DIG1 | Digit 1 cathode driver | I/O |
| 12 | LOAD | Latch data on rising edge | BUS |
| 13 | CLK | SPI clock | BUS |
| 14 | SEG-DP | Decimal point segment | I/O |
| 15 | SEG-A | Segment A driver | I/O |
| 16 | SEG-F | Segment F driver | I/O |
| 17 | SEG-B | Segment B driver | I/O |
| 18 | SEG-G | Segment G driver | I/O |
| 19 | ISET | Current set resistor | ADC |
| 20 | V+ | Supply voltage 4V–5.5V | PWR |
| 21 | SEG-C | Segment C driver | I/O |
| 22 | SEG-E | Segment E driver | I/O |
| 23 | DOUT | Serial data output for daisy-chain | BUS |
| 24 | SEG-D | Segment D driver | I/O |