AATIAN77 Datasheet, PDF (1/4 Pages) SiGe Semiconductor, Inc. – I/O Expander Switch with Serial Control

EV-112
AAT4290IJS-1-DB3 EVAL
I/O Expander Switch with Serial Control
Introduction
The AAT4290IJS-1-DB3 EVAL board demonstrates the AAT4290 SmartSwitch™, which has five P-channel
MOSFETs and is configured for use as a microprocessor I/O expander application. Having independent drain
outputs and a common source input, the device operates with an input voltage range of 1.8V to 5.5V, making
it ideal for 1.8V, 2.5V, 3.3V, or 5V systems, as well as systems powered by lithium-ion/polymer batteries. The
AAT4290 features a 500ns slew rate limited turn-on time and is controlled by an S²Cwire™ (Simple Serial
Control™) interface, which permits ease of control and efficiency.
This document describes the evaluation board and its accompanying user interface. In addition, a brief
Getting Started section is included to help the user begin operating the evaluation board. A schematic of the
complete circuit is shown in Figure 1. The actual board layout is shown in Figures 2 and 3. For additional infor-
mation, please consult the AAT4290 product datasheet.
DC-
DC+
J1
JP1
1
2
3
U1
1
2
3
4
IN
OU T3
OUT2 OU T4
OUT1 OU T5
EN /SET GN D
AAT4290A
J2
TP
TP
8
7
6
5
R6
TP
R7
TP
R8
TP
R9
R10
330Ω
330Ω
330Ω
330Ω
C4
0.1µF
Out5
C5
0.1µF
Out4
C6
0.1µF
Out3
C7
0.1µF
Out2
C8
0.1µF
Out1
GND
Green
1
2
3
R4
100kΩ
GND
DC+
SW3
0
21
43
5
SW2
0
21
43
5
SW1
0
21
43
5
GND
R3 R2 R1
1kΩ 1kΩ 1kΩ
C2
1
22pF
C3
2
X1
20MHz
22pF
GND
U2
1 _VDD
2 _GP5
3 _GP4
4 _GP3
VSS ⁸
GP0 ⁷
GP1 ⁶
GP2 ⁵
PIC12F675
C1
1µF
GND
R5
330Ω
LED1
RED
GND
Figure 1: AAT4290IJS-1-DB3 Evaluation Board Schematic.
EV-112.2005.06.1.0
1