MAX6956

PRODUCTION

2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander

Data Sheet (Rev. 5) Product Selection Table
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Overview

  • 400kbps I²C-Compatible Serial Interface
  • 2.5V to 5.5V Operation
  • -40°C to +125°C Temperature Range
  • 20 or 28 I/O Ports, Each Configurable as
    • Constant-Current LED Driver
    • Push-Pull Logic Output
    • Schmitt Logic Input
    • Schmitt Logic Input with Internal Pullup
  • 11µA (max) Shutdown Current
  • 16-Step Individually Programmable Current Control for Each LED
  • Logic Transition Detection for Seven I/O Ports

The MAX6956 compact, serial-interfaced LED display driver/I/O expander provide microprocessors with up to 28 ports. Each port is individually user configurable to either a logic input, logic output, or common-anode (CA) LED constant-current segment driver. Each port configured as an LED segment driver behaves as a digitally controlled constant-current sink, with 16 equal current steps from 1.5mA to 24mA. The LED drivers are suitable for both discrete LEDs and CA numeric and alphanumeric LED digits.

Each port configured as a general-purpose I/O (GPIO) can be either a push-pull logic output capable of sinking 10mA and sourcing 4.5mA, or a Schmitt logic input with optional internal pullup. Seven ports feature configurable transition detection logic, which generates an interrupt upon change of port logic level. The MAX6956 is controlled through an I²C-compatible 2-wire serial interface, and uses four-level logic to allow 16 I²C addresses from only 2 select pins.

The MAX6956AAX and MAX6956ATL have 28 ports and are available in 36-pin SSOP and 40-pin thin QFN packages, respectively. The MAX6956AAI and MAX6956ANI have 20 ports and are available in 28-pin SSOP and 28-pin DIP packages, respectively.

For an SPI-interfaced version, refer to the MAX6957 data sheet. For a lower cost pin-compatible port expander without the constant-current LED drive capability, refer to the MAX7300 data sheet.

Applications

  • Automotive
  • Bar Graph Displays
  • Industrial Controllers
  • Panel Meters
  • Set-Top Boxes
  • System Monitoring
  • White Goods
MAX6956
2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander
MAX6956: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Application Note 1

Design Note 1

Technical Articles 4

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
I/O Expanders 2
MAX7317
PRODUCTION 10-Port SPI-Interfaced I/O Expander with Overvoltage and Hot-Insertion Protection
MAX7318
PRODUCTION 2-Wire-Interfaced, 16-Bit, I/O Port Expander with Interrupt and Hot-Insertion Protection
LED Drivers 11
MAX6950
PRODUCTION Serially Interfaced, +2.7V to +5.5V, 5- and 8-Digit LED Display Drivers
MAX6951
PRODUCTION Serially Interfaced, +2.7V to +5.5V, 5- and 8-Digit LED Display Drivers
MAX6952
PRODUCTION 4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 x 7 Matrix LED Display Driver
MAX6953
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 x 7 Matrix LED Display Driver
MAX6954
PRODUCTION 4-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
MAX6955
PRODUCTION 2-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
MAX6957
PRODUCTION 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port LED Display Driver and I/O Expander
MAX6958
PRODUCTION 2-Wire Interfaced, 3V to 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan
MAX6959
PRODUCTION 2-Wire Interfaced, 3V to 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan
MAX7219
PRODUCTION Serially Interfaced, 8-Digit, LED Display Drivers
MAX7221
PRODUCTION Serially Interfaced, 8-Digit, LED Display Drivers
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Tools & Simulations

Software Development 1

Evaluation Kits

MAX6956EVKIT

Evaluation Kit for the MAX6956

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Features and Benefits

  • Windows 2000/XP-, Windows Vista (32-Bit)- and Windows 10** Compatible Software
  • USB-PC Connection (Cable Included)
  • USB Powered
  • Lead-Free and RoHS Compliant
  • Proven PCB Layout
  • Surface-Mount Components
  • Fully Assembled and Tested

Product Details

The MAX6956 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB that contains a MAX6956 IC. The MAX6956 is a 28-port LED driver and I/O expander. The EV kit also includes Windows® 2000/XP- and Windows Vista®-compatible software that provides a simple graphical user interface (GUI) for exercising the features of the MAX6956.

Applications

  • Automotive
  • Bar Graph Displays
  • Industrial Controllers
  • Panel Meters
  • Set-Top Boxes
  • System Monitoring
  • White Goods
MAX6956EVKIT
Evaluation Kit for the MAX6956

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