A S 11 0 0
Serially Interfaced, 8-Digit LED Driver
D a ta S he 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 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
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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
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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
+5V
19
9.53k
18
MOSI
µP I/O
SCK
V
DD
ISET
DIFG0-DIG3
8 Digits
1 DIN
12 LOAD
1 CLK
9 GND
SEG A-G
SEP DP
GND
4
8 Segments
8-Digit µP Display
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