Datasheet Analog Devices MAX7221CWG+T — 数据表

Click here to ask about the production status of specific part numbers. MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers General 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^TM, QSPI^TM,
and MICROWIRE^TM, 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. Applications ● Bar-Graph Displays
● Industrial Controllers ● Panel Meters …