General Description
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.

Features
♦ 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

Applications
Set-Top Boxes
Bar Graph Displays
Panel Meters
Industrial Controllers
White Goods
System Monitoring
Automotive