AS1105 LED Driver IC

Description

The AS1105 is a LED driver for 7 segment numeric displays of up to 4 digits. The AS1105 can be programmed via a conventional 4 wire serial interface. It includes a BCD code- B decoder, a multiplex scan circuitry, segment and display drivers and a 32 Bit memory. The memory is used to store the LED settings, so that continuos reprogramming is not necessary. Every individual segment can be addressed and updated separately. Only one external resistor is required to set the current through the LED display. Brightness can be controlled either in an analog or digital way.

The user can choose the internal code-B decoder to display numeric digits or to address each segment directly. The AS1105 features an extremely low shutdown current of only 20µA and an operational current of less than 500µA. The number of visible digits can be programmed as well. The AS1105 can be reset by software and an external clock can be used. Several test modes support easy debugging. AS1105 is offered in a 20 pin SOIC package.

Key Features

• Cost effective version of AS1100 functionality for applications up to 4-Digits
• 10MHz Serial Interface
• Individual LED Segment Control
• Decode/No-Decode Digit Selection
• 20µA Low-Power Shutdown (Data Retained)
• Extremely low Operating Current 0.5mA in open loop
• Digital and Analog Brightness Control
• Display Blanked on Power-Up
• Drive Common-Cathode LED Display
• Software Reset
• Optional External clock
• 20-Pin SO Packages
• Functional compatible to AS1100 and MAX7219

Applications

• Bar Graph Displays
• Industrial Controllers
• Panel Meters
• LED Matrix Displays

Block diagram for AS1105 LED Driver IC