Data Sheet Rev. 4
CN Rev. 4 | JP Rev. 4

Overview

Features and Benefits

  • 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

Product Details

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.

Applications

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

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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Documentation & Resources

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  • Data Sheets (1)
  • Reliability Data (1)
  • Application Notes (1)
  • Design Notes (7)
  • Technical Articles (3)
    • Document Type
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    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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