Serial interface, 8 bits, LED display driver

An overview of the

MAX7219 serial input/output/MAX7221 for compact common cathode display drive, used to connect to the microprocessor (mu P) and 8 7 segment LED digital tube display, LED bar graph display or 64 independent. Device with a built-in BCD code decoder B, multiplexing scanning circuit, and a drive and store each number 8 by 8 static RAM. Just an external resistor can set all the LED current. MAX7221 compatible with SPI ™, QSPI ™ and MICROWIRE ™ interface, the drive with a set rate limit, in order to reduce EMI.

Convenience of four wire serial interface can connect all the general mu P. Can be individually addressed each number and update, the need to write the whole display. MAX7219 / MAX7221 also allows users to choose B code for each digital coding or decoding way.

Device has shut off 150 mu A low power mode, analog and digital brightness control, allows users to display 1 to 8 digits, and limit the scan register light force all the LED test mode.

If you need 3 v working voltage of twinkling or field application, please refer to the MAX6951 data.

The key features

10 MHZ serial interface

Independent LED segment control

Coding/decoding a choice

150 mu A low power shut off (keep) data

Digital and analog brightness control

When power in the state of all

Drive the common cathode LED display

Period of actuator placement rate limiting function helps reduce EMI (MAX7221)

SPI serial interface, QSPI, MICROWIRE (MAX7221)

24 pin DIP and SO encapsulation

Application/use

Bar graph display

Industrial controller

LED dot matrix display

Panel table