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MAX6955：2-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan

2-Wire Interfaced, 2.7V to 5.5V LED Display Drivers with GPIO and Key Scan

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. Included on chip are full 14- and 16-segment ASCII 104-character fonts, a hexadecimal font for 7-segment displays, multiplex scan circuitry, anode and cathode drivers, and static RAM that stores each digit. The maximum segment current for the display digits is set using a single external resistor. Digit intensity can be independently adjusted using the 16-step internal digital brightness control. The MAX6955 includes a low-power shutdown mode, a scan-limit register that allows the user to display from 1 to 16 digits, segment blinking (synchronized across multiple drivers, if desired), and a test mode, which forces all LEDs on. The LED drivers are slew-rate limited to reduce EMI. For an SPI-compatible version, refer to the MAX6954 data sheet. An evaluation kit (EV kit) for the MAX6955 is available.

Key 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

MAX6955: Functional Diagram Applications/Uses Audio/Video Equipment Bar Graph Displays Panel Meters Set-Top Boxes White Goods

DataSheet

Parametrics

Design kits & evaluation modules

• MAX6955EVKIT

Quality and Environmental Data

• MAX6955.pdf

Related Products

• MAX6958：2-Wire Interfaced, 3V to 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan
• MAX6959：2-Wire Interfaced, 3V to 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan
• MAX6956：2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander
• MAX6954：4-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
• MAX6952：4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 x 7 Matrix LED Display Driver
• MAX6957：4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port LED Display Driver and I/O Expander
• MAX6953：2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 x 7 Matrix LED Display Driver
• MAX6950：Serially Interfaced, +2.7V to +5.5V, 5- and 8-Digit LED Display Drivers
• MAX6951：Serially Interfaced, +2.7V to +5.5V, 5- and 8-Digit LED Display Drivers
• MAX7221：Serially Interfaced, 8-Digit, LED Display Drivers
• MAX7219：Serially Interfaced, 8-Digit, LED Display Drivers
• ICM7218：8-Digit, Multiplexed, LED Decoder Driver

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