A S 11 0 0

S e r i a l l y I n t e r f a c e d , 8 - D i g i t L E D D r i v e r

www.austriamicrosystems.com/LED-Driver-ICs/AS1100

Revision 1.37

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D a t a s h e e t

1 General Description

The AS1100 is an LED driver for 7 segment numeric displays of up to

8 digits. The AS1100 can be programmed via a conventional 4 wire

serial interface.

The device includes a BCD code-B decoder, a multiplex scan

circuitry, segment and display drivers, and a 64 Bit memory. The

memory is used to store the LED settings, so that continuous

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 AS1100 features an extremely low shutdown current of only

20 A and an operational current of less than 500 A. The number of

visible digits can be programmed as well. The AS1100 can be reset

by software and an external clock can be used. Several test modes

support easy debugging.

The AS1100 is offered in a 24-pin SOIC package.

2 Key Features

10MHz Serial Interface

Individual LED Segment Control

Decode/No-Decode Digit Selection

20 A 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

24-pin SOIC Package

3 Applications

The AS1100 is an ideal solution for Bar-Graph Displays, Industrial

Controllers, Panel Meters, LED Matrix Displays and White Goods

such as washing machines and dishwasher.

Figure 1. AS1100 - Typical Application Diagram

8 Digits

8 Segments

GND

GND

CLK

LOAD

DIN

ISET

VDD

DIFG0-DIG3

SEG A-G

SEP DP

MOSI

P I/O

SCK

+5V

8-Digit P Display

9.53k

19

18

1

12

1

9

4

AS1100