Dot Matrix Display Module Single-Chip Control LED Module DIY Kit for Arduino with 5-pin Line, MAX7219 – DELL0001

The MAX7219/MAX7221 are compact, serial input/out-put common-cathode display drivers that interface microprocessors (µPs) to 7-segment numeric LED dis-plays of up to 8 digits, bar-graph displays, or 64 indi-vidual LEDs. Included on-chip are a BCD code-B Decoder, multiplex scan circuitry, segment and digitdrivers, and an 8×8 static RAM that stores each digit. Only one external resistor is required to set the seg-ment 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 3-wire serial interface connects to allcommon µPs. Individual digits may be addressed and updated without rewriting the entire display. TheMAX7219/MAX7221 also allow the user to select code-B decoding or no-decode for each digit.The devices include a 150µA low-power shutdownmode, 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.