Data Sheet AS1100
Serially Interfaced, 8-Digit LED Driver
AS1100
Key Features
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DATA SHEET
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 SO Packages
Fully compatible to MAX7219
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 fully compatible to the MAX 7219. AS1100 is
offered in a 24 pins PDIP and SOIC package.
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. It 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.
Applications
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Bar-Graph Displays
Industrial Controllers
Panel Meters
LED Matrix Displays
White Goods
TOP
DIN
DIG0
DIG4
GND
DIG6
DIG2
DIG3
DIG7
GND
DIG5
DIG1
1
2
3
4
5
6
7
8
9
10
11
24
23
22
21
20
19
DOUT
SEG D
SEG DP
SEG E
SEG C
VDD
ISET
SEG G
SEG B
SEG F
SEG A
CLK
9.53k
18
1
12
1
+5V
19
VDD
ISET
DIN
LOAD
CLK
DIG0-DIG7
8 Digits
AS1100
18
17
16
15
14
13
MOSI
µP I/O
SCK
LOAD
12
SEG A-G
SEP DP
9
GND GND
4
8 Segments
DIP/SO 24
Pin Configuration
8-Digit µP Display
Typical Application Circuit
1
Software Reset and external clock are not supported by
MAX7219
Revision 1.32, Oct. 2004
Page 1 of 12
AMSCO [ AUSTRIAMICROSYSTEMS AG ]
