Data Sheet AS1100
Revision 1.32, Oct. 2004 Page 1 of 12
Key Feature s
- 10MHz Se rial Inter face
- Individu al LED Seg ment Control
- Decode/No-Decode Digit Selection
- 20µA Lo w-Power Shut down (Data Retained )
- Extremely low Ope rating Curr ent 0.5mA in open loo p
- Digital and Analog Brightness Control
- Display Blanked on Power-Up
- Drive Common-C athode LED Display
- Software Reset
1
- Optional Ex ternal clock
- 24-Pin DIP and SO Packages
- Fully compatible to MAX7219
General Des cription
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 d rivers and a 64 Bit memory. The memory is used to
store the LED settings, so that continuous reprogramming is
not necessary.
1
Software Reset and external clock are not supported by
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 soft ware and an external clock can be used.
Several t est modes s upport easy debugging.
The AS1100 is fully compatible to the MAX 7219. AS1100 is
offered i n a 24 pins PDIP and SOI C package.
Applications
- Bar-Grap h Displays
- Industri al Cont rollers
- Panel Meters
- LED Matrix Displays
- White Goods
Serially In terfaced, 8-Digit LED Driver
AS1100
DATA SH EET
8-Digit µP Display
8 Segments
8 Digits
9.53k
+5V
MOSI
µP I/O
SCK
LOAD
CLK
GND
GND
DIG0-DIG7
SEG A-G
VDD
ISET
DIN
Pin Confi
urati on
Typical Application Circuit
AS1100
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
DIP/SO 24
DIN
DIG0
DIG1
DIG2
DIG3
DIG4
DIG5
DIG6
DIG7
GND
GND
LOAD
DOUT
VDD
ISET
CLK
SEG A
SEG B
SEG C
SEG D
SEG E
SEG F
SEG G
SEG D P
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