Analog Devices / Maxim Integrated MAX7219 & MAX7221 8-Digit LED Drivers
Analog Devices MAX7219 and MAX7221 8-Digit LED Display Drivers are compact, serial input/output common-cathode display drivers that interface microprocessors to 7-segment numeric LED displays of up to 8 digits, to bar-graph displays, or to 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.
A convenient 4-wire serial interface connects to all common microprocessors. Individual digits may be addressed and updated without rewriting the entire display. MAX7219 also allows the user to select code-B decoding or no-decode for each digit. Analog Devices MAX7219 and MAX7221 8-Digit LED Display Drivers 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.
Features
- 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
Applications
- Bar-graph displays
- Industrial controllers
- Panel meters
- LED matrix displays
Development Tools
Analog Devices / Maxim Integrated MAXREFDES99 Display Driver Reference Design
An Arduino® form-factor shield which drives a 16x16 LED array for signage applications.
Functional Block Diagram
Publicado: 2012-05-25
| Actualizado: 2023-04-14