MAX7219CWG: Serially Interfaced, 8-Digit LED Display Drivers

The MAX7219CWG is a compact, serial input/output common-cathode display driver that can interface microprocessors to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs. Manufactured by Maxim Integrated, this integrated circuit is designed to minimize the complexity of display interface with microcontrollers, offering a simple and effective solution for displaying numerical information.

Key Features:

• Integrated Multiplexing: The MAX7219CWG incorporates BCD code-B decoders, multiplex scan circuitry, segment and digit drivers, and an 8x8 static RAM to store each digit. This level of integration facilitates the creation of complex displays without the need for numerous components, reducing board space and system complexity.
• Individual LED Control: Each of the 64 LEDs can be individually controlled, allowing for the creation of custom displays or the use of the device in non-standard applications beyond simple 7-segment displays.
• Serial Interface: The device is designed to be interfaced with microprocessors through a simple 3-wire serial interface, significantly reducing the number of I/O pins required from the controlling microprocessor or microcontroller.
• Digital Brightness Control: An onboard digital brightness control allows the brightness of the LEDs to be controlled through software, enabling dynamic adjustments to suit various lighting conditions or to achieve power savings.
• Low Power Consumption: The MAX7219CWG is optimized for low power consumption, making it suitable for battery-operated applications.
• Cascade Capability: Multiple MAX7219CWG devices can be cascaded for larger display applications without the need for additional decoding or driving circuitry.

Applications:

• Bar-graph displays
• Industrial controllers
• Panel meters
• LED matrix displays

The MAX7219CWG operates from a single 5V supply and is encapsulated in a 24-pin wide-body SO package. Its robust design includes 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. With its versatility and ease of use, the MAX7219CWG is an ideal solution for a wide range of applications requiring LED display control.