is an integrated common cathode display driver for serial I/O, it connects to a microprocessor, 8-bit 7-segment, LED display, it is also possible to connect a line graph display or 64 individual LEDs. It includes a BCD Type B encoder, aMulti-channel scan cycles, a segment driver and an 8*8 static RAM for storing each data. only one externalA register is used to set each LED to the current segment. A convenient four-wire serial interface allows connection to allGeneral purpose microprocessor. Each data can be addressed when updating without overwriting the entire display. MAX7219, you can also choose to encode or not encode each data. The whole machine includes 150uA low-power shutdown mode, analog and digital dimming, scan limit registers that allow the user to display 1-8 bits of data, and a fulll LED detection mode. Only 3 I/O ports can control 1 dot matrix! Adopt matrix display, no flicker! Cascade is Supported!