Data Sheets - Skyworks Solutions, Inc.

EVALUATION BOARD DATA SHEET
EV173
Evaluation Board for the AAT4292 Seven-Channel High-Side I/O Expander
Introduction
The AAT4292IJS-DB1 EVAL board demonstrates the AAT4292 SmartSwitch™, which has seven P-channel MOSFETs and
one single-wire series control interface and is configured for use as a microprocessor I/O expander application, or for
cell phone keypad, backlight and fashion lighting control, or multi-channel low power switching applications. 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 AAT4292 features a 500ns slew rate limited turn-on time and is controlled by an AS2Cwire™ (Advanced Simple
Serial Control™) interface, which permits ease of control and efficiency.
This document describes the evaluation board as illustrated in Figure 1a and 1b, 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 2. The actual board layout is shown in Figure 3 and 4. For additional information, please consult the AAT4292 product datasheet.
Figure 1a: AAT4292 Evaluation Board
Top View.
Figure 1b: AAT4292 Evaluation Board
Bottom View.
Layout Guidelines
The following guidelines should be followed to ensure proper operation of the AAT4292:
1. If the device outputs OUT1 to OUT7 have capacitor load, depending on the load capacitor value, it is recommended that a 1µF to 10µF 0603 or 0805 ceramic capacitor be placed as close as possible between VIN and GND. This
helps to provide a low impedence loop to charge the load capacitor during the MOSFET switches' turn on transient
and keep the VIN voltage stable.
2. It is recommended to connect a 100kΩ pull-low resistor at the EN/SET pin, to avoid floating this pin.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202291A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012
1
EVALUATION BOARD DATA SHEET
EV173
Evaluation Board for the AAT4292 Seven-Channel High-Side I/O Expander
J1
Input Voltage
VCC
JP1
DC+
C9
3
2
1
U1
DC1
CON 1
2
TP4
3
TP5
4
TP6
R4
330Ω
R5
330Ω
C5
0.1μF
C4
0 .1 μF
LED4
R6
330Ω
C6
0.1μF
LED5
TP7
R7
330 Ω
C7
0 .1μF
5
OUT4
VIN
OUT5
OUT 3
OUT6
OUT 2
OUT7
OUT 1
GND
EN /SET
10μF
10
8
TP3
7
TP2
6
TP1
R1
330Ω
C1
0.1 μF
AAT4292
LED6
GND
9
LED1
LED7
R3
R2
330Ω
LED2
C2
0 .1μF
330Ω
C3
0.1μF
LED3
R8
100kΩ
GND
GND
GND
U2
OSC1
R13
330Ω
R9
1kΩ
C8
1μF
R10
1kΩ
1
2
3
4
R 11
1kΩ
GND
SW3
LED8
20MHz
JP2
VDD
GP5
GP4
GP3
VSS
GP0
GP1
GP2
8
7
6
5
GND
PIC12F675
SW2
TP8 _GND
SW1
GND
Figure 2: AAT4292IJS-DB1 Evaluation Board Schematic.
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Figure 3: AAT4292 Evaluation Board
Top Side Layout (not to scale).
Figure 4: AAT4292 Evaluation Board Bottom Side Layout (not to scale).
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202291A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012
EVALUATION BOARD DATA SHEET
EV173
Evaluation Board for the AAT4292 Seven-Channel High-Side I/O Expander
Getting Started
The AAT4292IJS-DB1 evaluation board is typically mounted on a battery pack. The jumper J1 is inline with the battery
supply for connecting/disconnecting the power for U2 (PIC12F675) and/or U1 (AAT4292IJS). There is an additional
shunt JP1 to connect/disconnect the power for U1 (AAT4292IJS). The shunt JP2 provides the connection/disconnection
from the AS2Cwire signal generator U2 to control U1.
The AAT4292 may be operated from an external power source. The shunt JP1 should be removed; the external power
may be applied to JP1 Pin 2 (which is connected to U1 VIN Pin 10). The external power source should be set from 1.8V
to 5.5V before the AAT4292 is turned on by mounting the shunt on JP2 and sending the pulsed signal from the signal
generator U2.
There are three buttons (SW1, SW2, and SW3) on the board, which enable and disable the ON and OFF state for the
seven output channels. Once a button or combination of buttons is toggled, the corresponding LED for OUT1 to OUT7
will turn ON or OFF accordingly, depending on the previous state. This indicates that the selected state has been submitted through the EN/SET line to the AAT4292. Detailed operations are listed in Table 1.
The AAT4292 outputs can be probed via the test points (TP1 to TP7).
Button(s) Pushed
SW2 one time, then SW1
SW2 two times, then SW1
SW2 three times, then SW1
SW2 four times, then SW1
SW2 five times, then SW1
SW2 six times, then SW1
SW2 seven times, then SW1
SW3
SW2 + SW3 (simultaneous)
SW1 + SW2 + SW3 (simultaneous)
Description
Toggle OUT1 on/off.
Toggle OUT2 on/off.
Toggle OUT3 on/off.
Toggle OUT4 on/off.
Toggle OUT5 on/off.
Toggle OUT6 on/off.
Toggle OUT7 on/off.
Auto cycling. All outputs blink (on and off) five times, and cycling turn on OUT1 to OUT7
five times, then ordinal turn on the output from OUT1 to OUT7 five times. Auto cycling
repeats three times.
All outputs ON.
All outputs OFF (OUT1-OUT7 floating).
Table 1: User Interface Functionality.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202291A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012
3
EVALUATION BOARD DATA SHEET
EV173
Evaluation Board for the AAT4292 Seven-Channel High-Side I/O Expander
Component
Part Number
Description
Manufacturer
U1
U2
SW1-SW3
OSC1
R1-R7, R13
R9-R11
R8
C1-C7 (optional)
C8
C9
LED1-LED7
LED8
TP1-TP8
CON1
J1
JP1, JP2
AAT4292
PIC12F675
Switch
CSTLS20M0X54
Chip Resistor
Chip Resistor
Chip Resistor
GRM188R71C104KA01D
GRM188R61A105KA61
GRM21BR61C106K
RS-0805UW
LED
Connector
Connector
Connector
Connector
Shunt
PCB
Seven Channel High-Side I/O Expander
8-bit CMOS, Flash-Based μC; 8-Pin SOIC Package
Switch Tact, SPST, 5mm
Ceramic Resonator, 20MHz, 3 pins
SMD, 330Ω, 5%, 150mW, 0603
SMD, 1kΩ, 5%, 150mW, 0603
SMD, 100kΩ, 5%, 150mW, 0603
SMD, Cap Ceramic 0.1μF 0603 X5R 16V 10%
SMD, Cap Ceramic 1μF 0603 X5R 10V 10%
SMD, Cap Ceramic 10μF 0805 X5R 16V 10%
SMD, White LED, 0805
Yellow LED, 0805
Connector for Test Point
Header, 2 pins, for DC input
Header, 3 pins, pitch 75mil
Header, 2 pins, pitch 75mil
Shunt for connector
AAT4292 Evaluation Board PCB
Skyworks
Microchip
Murata
Vishay
Vishay
Vishay
Murata
Murata
Murata
XRX
Skyworks
Table 2: AAT4292IJS-DB1 EVAL Board Bill of Materials.
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202291A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012