MAX7219CNG 8 Digit LED Display Driver IC

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 individual LEDs. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8×8 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 3-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.

• 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