AS1100

Serially Interfaced, 8-Digit LED Driver

Dat a Sh eet

www.austriamicrosystems.com

Revision 1.33

1 - 17

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 20µA and an operational current of less

than 500µA. 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 DIP and SOIC

packages.

2 Key Features

!

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

!

24-pin DIP and SOIC Packages

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. Typical Application Diagram – Single Cell to 3.3V Synchronous Boost Converter

8 Digits

8 Segments

GND

GND

CLK

LOAD

DIN

ISET

DIFG0-DIG3

SEG A-G

SEP DP

MOSI

µP I/O

SCK

+5V

8-Digit µP Display

9.53k

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