MAX7221CNG

The MAX7219/MAX7221 are compact, serial input/
output common-cathode display drivers that interface
microprocessors (?Ps) 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 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 4-wire serial interface connects to all
common ?Ps. 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.