AAT4290/91
I/O Expander Load Switches with Serial Control
Applications Circuits
VSUPPLY
1.8 to 5.5V
AAT4290
IN
OUT1
Function 1
Function 2
Function 3
Function 4
Function 5
EN 1
EN 2
EN 3
EN 4
EN 5
EN/SET
GPIO 1
OUT2
OUT3
OUT4
OUT5
System
µController
GPIO 2
GPIO 2
to
GPIO 5
GPIO 3
GPIO 4
GPIO 5
are now free for
other uses
Figure 1: GPIO I/O Expander
(condense five GPIO control lines to one).
AAT3110IJS-5.0
SC70JW-8: 2x2mm
AAT4291IJS
SC70JW-8: 2x2mm
VIN
IN
VOUT
C+
OUT1
OUT2
OUT3
VBATTERY
10µF
10µF
RGB LED
G
R
B
1µF
ON/OFF
SHDN
C-
EN/SET
GND
GND
RR
RG
RB
CLOCK
Figure 2: RGB LED Control
(eliminates three discrete MOSFET switches).
4290.2006.03.1.2
11
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
