Datasheet link: https://www.analog.com/media/en/technical-documentation/data-sheets/max7219-max7221.pdf

Description:

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 allow the user to select code-B

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 3V operation or segment blinking,

refer to the MAX6951 data sheet.

Features

? 10MHz Serial Interface

? Individual LED Segment Control

? Decode/No-Decode Digit Selection

? 150μA Low-Power Shutdown (Data Retained)

? Digital and Analog Brightness Control

? Display Blanked on Power-Up

? Drive Common-Cathode LED Display

? Slew-Rate Limited Segment Drivers

for Lower EMI (MAX7221)

? SPI, QSPI, MICROWIRE Serial Interface (MAX7221)

? 24-Pin DIP and SO Packages