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
MAX6955: Functional Diagram
Applications/Uses
  • Audio/Video Equipment
  • Bar Graph Displays
  • Panel Meters
  • Set-Top Boxes
  • White Goods
DataSheet
titleDownload file
MAX6955 Data SheetMAX6955.pdf
Parametrics
Part NumberLCD or LEDDigits or Char.Output FormatDisplay TypeInterfaceFontsSegment BlinkingVSUPPLY
(V)
VSUPPLY
(V)
Package/PinsBudgetary
Price
minmaxSee Notes
MAX6955LED8-Digit 16-Segment
8-Digit 14-Segment
16-Digit 7-Segment
7 segments
14 segments
16 segments
Common CathodeSerial 2-Wire 400kbit104 char ASCII
Hexadecimal
Yes2.75.5SSOP/36
TQFN/40
$9.67 @1k
Design kits & evaluation modules
Quality and Environmental Data
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
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6955AAXNo Longer AvailableMAX6955AAX+SSOP,;36 pin;163.4 mm²-40°C to +125°CNo
MAX6955AAX+ActiveSSOP,;36 pin;163.4 mm²-40°C to +125°CLead Free
MAX6955AAX+TActiveSSOP,;36 pin;163.4 mm²-40°C to +125°CLead Free
MAX6955AAX-TNo Longer AvailableMAX6955AAX+TSSOP;36 pin-40°C to +125°CSee data sheet
MAX6955ATLNo Longer AvailableMAX6955ATL+QFN;-40°C to +125°CSee data sheet
MAX6955ATL+ActiveTQFN,;40 pin;37.2 mm²-40°C to +125°CLead Free
MAX6955ATL+TActiveTQFN,;40 pin;37.2 mm²-40°C to +125°CLead Free
MAX6955ATL-TNo Longer AvailableMAX6955ATL+TQFN;-40°C to +125°CSee data sheet
MAX6955.pdf MAX6955
MAX6955.pdf MAX6955
MAX6955.pdf MAX6955
Using the MAX6955 LED Display Driver with a PIC Microcontroller to Scroll Messages MAX6955
LEDs Are Still Popular (and Improving) after All These Years MAX6966
Charlieplexing - Reduced Pin-Count LED Display Multiplexing MAX6959
Electronic Displays Comparison MAX6966
Adding Global LED Intensity Control to the MAX6954 and MAX6955 LED Drivers MAX5160
Selecting Numeric and Alphanumeric Display Configurations for the MAX6954 and MAX6955 SPI and I²C LED Display Drivers MAX6955
MAX6955.pdf MAX6955
MAX6955.pdf MAX6955