MAX7219 CONTROLADOR DE LED 8 DIGITOS

Sólo precisa de una resistencia externa para hacerlo funcionar. El integrado dispone de un decoder BCD code-B, realiza el multiplexa y dispone de su propia RAM interna de 8x8 para poder almacenar el valor de cada dígito. Se controla a través de tan sólo 3 patillas.

Se trata de una muy buena opción en el caso que tengamos que controlar con nuestro Arduino, u otro microcontrolador, una cantidad considerable de diodos LED o dígitos de 8 segmentos. Incluso con él podemos controlar una matriz de LED de hasta 8x8, todo ello con un sólo MAX7219. No olvidemos que además es compatible con SPI™, QSPI™, y MICROWIRE™.

Descripción General

The MAX7219/MAX7221 are compact, serial input/out-put 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™, QSPI™, and Microwire™, and has slew rate-limited segment drivers to reduce EMI. A convenient 3-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.

Aplicaciones

• Bar-Graph Displays
• 7-Segment Displays
• Industrial Controllers
• Panel Meters
• LED Matrix Displays

Características

• 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
• Slew-Rate Limited Segment Drivers for Lower EMI (MAX7221)
• SPI, QSPI, Microwire Serial Interface (MAX7221)
• 24-Pin DIP and SO Packages