General Description

The MAX6955 is a compact display driver that interfaces microprocessors to a mix of 7-segment, 14-segment, and 16-segment LED displays through an I2C-compatible 2-wire serial interface. The MAX6955 drives up to 16 digits 7-segment, 8 digits 14-segment, 8 digits 16-segment, or 128 discrete LEDs, while functioning from a supply voltage as low as 2.7V. The driver includes five I/O expander or general-purpose I/O (GPIO) lines, some or all of which can be configured as a key-switch reader. The key-switch reader automatically scans and debounces a matrix of up to 32 switches.

Benefits and Features

● Simplifies Driving 5 x 7 Matrix LED Displays

    • Drives Common-Cathode Monocolor and Bicolor LED Displays

    • Drives Up to 16 Digits 7-Segment, 8 Digits 14-Segment, 8 Digits 16-Segment, 128 Discrete LEDs, or a Combination of Digit Types

    • 2.7V to 5.5V Operation

● Standard 2-Wire Interface Supports a Variety of Microprocessor Architectures

    • 400kbps 2-Wire I2C-Compatible Interface

● Integrated Flexibility Supports Different Application Requirements

    • Built-In ASCII 104-Character Font for 14-Segment and 16-Segment Digits and Hexadecimal Font for 7-Segment Digits

    • 16-Step Digit-by-Digit Digital Brightness Control

    • Display Blanked on Power-Up

    • Automatic Blinking Control for Each Segment

    • 10µA (typ) Low-Power Shutdown (Data Retained)

● Five GPIO Port Pins Can Be Configured as Key-Switch Reader to Scan and Debounce Up to 32 Switches with n-Key Rollover

    • IRQ Output when a Key Input Is Debounced

● Slew-Rate-Limited Segment Drivers for Lower EMI

● 36-Pin SSOP and 40-Pin DIP and TQFN Packages

● Automotive Temperature Range Standard Covers Usage in Harsh Environments

Applications

    Set-Top Boxes

    Bar Graph Displays

    Panel Meters

    Audio/Video Equipment

    White Goods