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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


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Data Sheet
FULL DATA SHEET (PDF, 608kB)
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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.

Key Features   Applications/Uses
  • 400kbps 2-Wire I²C-Compatible Interface
  • 2.7V to 5.5V Operation
  • Drives Up to 16 Digits 7-Segment, 8 Digits 14-Segment, 8 Digits 16-Segment, 128 Discrete LEDs, or a Combination of Digit Types
  • Drives Common-Cathode Monocolor and Bicolor LED Displays
  • Built-In ASCII 104-Character Font for 14-Segment and 16-Segment Digits and Hexadecimal Font for 7-Segment Digits
  • Automatic Blinking Control for Each Segment
  • 10µA (typ) Low-Power Shutdown (Data Retained)
  • 16-Step Digit-by-Digit Digital Brightness Control
  • Display Blanked on Power-Up
  • Slew-Rate-Limited Segment Drivers for Lower EMI
  • 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
  • 36-Pin SSOP and 6mm x 6mm 40-Pin TQFN Packages
  • Automotive Temperature Range Standard
  • Underwriters Laboratories (UL®) Recognized

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

    Key Specifications:   Display Drivers
    Part Number Features LCD or LED Digits or Char. Output per Digit/Char. Display Type Interface Fonts Segment Blinking Supply Voltage (min) (V) Supply Voltage (max) (V) Price**
    MAX6955 
    32 Key Scanning, 5 GPIO
    LED 8-Digit 16-Segment
    8-Digit 14-Segment
    16-Digit 7-Segment
    7 segments
    14 segments
    16 segments
    Common Cathode Serial 2-Wire 400kbit 104 char ASCII
    Hexadecimal
    Yes 2.7 5.5 $8.69 @ 1k
    See All Display Drivers (52)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Application Notes
  • Application Note 828: LED Manufacturers' Web Sites - MAX6955
  • Application Note 1131: Selecting Numeric and Alphanumeric Display Configurations for the MAX6954 and MAX6955 SPI and I²C LED Display Drivers - MAX6955
  • Application Note 1148: Adding Global LED Intensity Control to the MAX6954 and MAX6955 LED Drivers - MAX6955
  • Application Note 1193: Electronic Displays Comparison - MAX6955
  • Application Note 1880: Charlieplexing - Reduced Pin-Count LED Display Multiplexing - MAX6955
  • Application Note 1883: LEDs Are Still Popular (and Improving) after All These Years - MAX6955
  • Application Note 2791: Using the MAX6955 LED Display Driver with a PIC Microcontroller to Scroll Messages - MAX6955
  • Application Note 3210: Quick-Start: Driving 7-Segment Displays with the MAX6954 - MAX6955
  • Application Note 3211: Quick-Start: Driving 14-Segment Displays with the MAX6954 - MAX6955
  • Application Note 3212: Quick-Start: Driving 16-Segment Displays with the MAX6954 - MAX6955
  • Application Note 3462: Extending MAX6954 and MAX6955 Keyscan Beyond 32 Keys - MAX6955

    Evaluation Kits
  • MAX6955EVKIT

    Reliability Reports
  • Show FIT data for:
  • Request Reliability Report for:
  • Underwriters Laboratories (UL®) Recognized

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-9 of 9

    MAX6955 Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6955APL+  
    PDIP(W);40 pin;836 mm²
    Outline Drawing: 21-0044 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P40+1*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6955AAX  
    SSOP;36 pin;163 mm²
    Outline Drawing: 21-0040 (PDF)
    Land Pattern: 90-0098 (PDF)
    Use pkgcode/variation: A36-2*
    -40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6955AAX-T  
    SSOP;36 pin;163 mm²
    Outline Drawing: 21-0040 (PDF)
    Land Pattern: 90-0098 (PDF)
    Use pkgcode/variation: A36-2*
    -40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6955AAX+  
    SSOP;36 pin;163 mm²
    Outline Drawing: 21-0040 (PDF)
    Land Pattern: 90-0098 (PDF)
    Use pkgcode/variation: A36+2*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6955AAX+T  
    SSOP;36 pin;163 mm²
    Outline Drawing: 21-0040 (PDF)
    Land Pattern: 90-0098 (PDF)
    Use pkgcode/variation: A36+2*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6955ATL-T  
    TQFN;40 pin;37 mm²
    Outline Drawing: 21-0141 (PDF)
    Land Pattern: 90-0055 (PDF)
    Use pkgcode/variation: T4066+5*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6955ATL+T  
    TQFN;40 pin;37 mm²
    Outline Drawing: 21-0141 (PDF)
    Land Pattern: 90-0055 (PDF)
    Use pkgcode/variation: T4066+5*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6955ATL  
    TQFN;40 pin;37 mm²
    Outline Drawing: 21-0141 (PDF)
    Land Pattern: 90-0055 (PDF)
    Use pkgcode/variation: T4066+5*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6955ATL+  
    TQFN;40 pin;37 mm²
    Outline Drawing: 21-0141 (PDF)
    Land Pattern: 90-0055 (PDF)
    Use pkgcode/variation: T4066+5*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
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    Related Products
    MAX6953 2-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
    MAX6952 4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 x 7 Matrix LED Display Driver
    MAX6954 4-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
    MAX6956 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander
    MAX7219, MAX7221 Serially Interfaced, 8-Digit, LED Display Drivers
    ICM7218, ICM7228 8-Digit, Multiplexed, LED Decoder Driver
    MAX6950, MAX6951 Serially Interfaced, +2.7V to +5.5V, 5- and 8-Digit LED Display Drivers
    MAX6958, MAX6959 2-Wire Interfaced, 3V to 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan

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    Document Ref.: 19-2548; Rev 3; 2008-04-04
    This page last modified: 2008-06-23


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