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MAX6955

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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

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Product Details

See parametric specs for Display Drivers

Key Features

See parametric specs for Display Drivers
Parametric specs for Display Drivers
LCD or LED LED
Display Type Common Cathode
Interface Serial 2-Wire 400kbit
Digits or Char. 16-Digit 7-Segment
8-Digit 14-Segment
8-Digit 16-Segment
Output Format 14 segments
16 segments
7 segments
Fonts 104 char ASCII
Hexadecimal
Segment Blinking Yes
VSUPPLY (V) (min) 2.7
VSUPPLY (V) (max) 5.5
Package/Pins SSOP/36
TQFN/40
Budgetary
Price (See Notes) 		12.67
See parametric specs for Display Drivers
View Less

Simplified Block Diagram

Technical Docs

Data Sheet 2-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Aug 11, 2015
App Note Connecting Dual-Digit LED Modules
App Note Extending MAX6954 and MAX6955 Keyscan Beyond 32 Keys
App Note Quick-Start: Driving 16-Segment Displays with the MAX6954
App Note Quick-Start: Driving 14-Segment Displays with the MAX6954
App Note Quick-Start: Driving 7-Segment Displays with the MAX6954
App Note Using the MAX6955 LED Display Driver with a PIC Microcontroller to \r\nScroll Messages
App Note Charlieplexing - Reduced Pin-Count LED Display Multiplexing
App Note Electronic Displays Comparison
App Note Adding Global LED Intensity Control to the MAX6954 and MAX6955 LED Drivers
App Note Selecting Numeric and Alphanumeric Display Configurations for the MAX6954 and MAX6955 SPI and I²C LED Display Drivers
Tutorial LEDs Are Still Popular (and Improving) after All These Years
Tutorial LED Manufacturers' Web Sites

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Parameters

Parametric specs for Display Drivers
LCD or LED LED
Display Type Common Cathode
Interface Serial 2-Wire 400kbit
Digits or Char. 16-Digit 7-Segment
8-Digit 14-Segment
8-Digit 16-Segment
Output Format 14 segments
16 segments
7 segments
Fonts 104 char ASCII
Hexadecimal
Segment Blinking Yes
VSUPPLY (V) (min) 2.7
VSUPPLY (V) (max) 5.5
Package/Pins SSOP/36
TQFN/40
Budgetary
Price (See Notes) 		12.67
See parametric specs for Display Drivers

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

Applications/Uses

  • Audio/Video Equipment
  • Bar Graph Displays
  • Panel Meters
  • Set-Top Boxes
  • White Goods

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.

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.

Simplified Block Diagram

MAX6955: Functional Diagram MAX6955: Functional Diagram Zoom icon

Technical Docs

Data Sheet 2-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Aug 11, 2015
App Note Connecting Dual-Digit LED Modules
App Note Extending MAX6954 and MAX6955 Keyscan Beyond 32 Keys
App Note Quick-Start: Driving 16-Segment Displays with the MAX6954
App Note Quick-Start: Driving 14-Segment Displays with the MAX6954
App Note Quick-Start: Driving 7-Segment Displays with the MAX6954
App Note Using the MAX6955 LED Display Driver with a PIC Microcontroller to \r\nScroll Messages
App Note Charlieplexing - Reduced Pin-Count LED Display Multiplexing
App Note Electronic Displays Comparison
App Note Adding Global LED Intensity Control to the MAX6954 and MAX6955 LED Drivers
App Note Selecting Numeric and Alphanumeric Display Configurations for the MAX6954 and MAX6955 SPI and I²C LED Display Drivers
Tutorial LEDs Are Still Popular (and Improving) after All These Years
Tutorial LED Manufacturers' Web Sites

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.