Description:

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.

Applications:

-Bar-Graph Displays
-7-Segment Displays
-Industrial Controllers
-Panel Metres
-LED Matrix Displays

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