Pin #
AAT4290 AAT4291
Symbol Function
1 1 IN Input power supply is connected to the P-channel MOSFETs
sources. Connect a 1µF capacitor from IN to GND.
2 7 OUT2 P-channel MOSFET drain.
3 6 OUT1 P-channel MOSFET drain.
4 4 EN/SET Input control pin using S
2
Cwire serial interface. The device
records rising edges of the clock and decodes them into 32
states (8 states for AAT4291) which controls the ON/OFF
states of the MOSFETs. See Table 1 and Table 2 for out-
put settings.
5 5 GND Ground connection.
6 N/A OUT5 P-channel MOSFET drain.
7 N/A OUT4 P-channel MOSFET drain.
8 8 OUT3 P-channel MOSFET drain.
AAT4290/4291
I/O Expander Load Switches with Serial Control
2 4290.2005.01.1.0
