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