MAX7219CWG MAX7219 SOP24 DRIVER LED DISPLAY

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 digit
drivers, and an 8x8 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 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.

Data Sheet