MAX6955APL+

Display Drivers Overview

The MAX6955APL+ is an LED display driver manufactured by Analog Devices Inc./Maxim Integrated, designed for interfacing microprocessors with various LED displays via a 2-wire serial interface. It supports driving up to 16 digits of 7-segment, 8 digits of 14-segment, or 8 digits of 16-segment displays, as well as 128 discrete LEDs. The device operates on a supply voltage ranging from 2.7V to 5.5V and features integrated ASCII fonts for 14/16-segment digits and hexadecimal fonts for 7-segment displays. It includes five configurable GPIO pins that can function as a key-switch reader for up to 32 switches. The component is housed in a 40-pin TQFN package.

Display Drivers Feature Summary

• Supports mixed LED display configurations including 7-segment, 14-segment, and 16-segment types through a standard 2-wire I2C-compatible interface.
• Integrates built-in character fonts for alphanumeric display generation without requiring external memory storage.
• Provides flexible digital brightness control allowing digit-by-digit adjustment across multiple steps.
• Includes an automatic key-scan and debounce circuit capable of handling matrix switch inputs with interrupt output capability.

Display Drivers Applications

• Driving common-cathode monocolor and bicolor LED displays in industrial control panels
• Interfacing with alphanumeric displays in consumer electronics and home appliances
• Implementing keypad input scanning in embedded systems and instrumentation

Display Drivers Procurement Notes

Verify the specific suffix 'APL+' against official Analog Devices documentation to confirm pinout compatibility and thermal characteristics. Ensure the selected package variant matches your PCB footprint requirements. Confirm RoHS compliance status and check for any active obsolescence notices before finalizing procurement plans.

Display Drivers Selection Notes

Select this component when a compact solution is needed for driving complex LED displays with minimal microprocessor overhead. Consider the integrated font generator and key-scan capabilities if space is limited. Evaluate the operating temperature range and power dissipation limits relative to your enclosure design constraints.

Display Drivers Part Context

The MAX6955 belongs to Maxim Integrated's family of serially interfaced LED drivers, offering high integration for display and input applications. It simplifies system design by reducing the number of required microcontroller pins and external components. This series is widely used in applications requiring reliable alphanumeric display and user input handling.

Display Drivers FAQ

Can the MAX6955 drive both 7-segment and 14-segment displays simultaneously?

Yes, the device supports driving a mix of 7-segment, 14-segment, and 16-segment displays, as well as discrete LEDs, within a single configuration.

What is the maximum number of switches the integrated key scanner can handle?

The key-switch reader can scan and debounce a matrix of up to 32 switches with n-key rollover capability.