Power Management Eval Board

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 information, please consult the AAT4290 product datasheet.
DC-
DC+
TP
TP
J1
U1
1
2
3
4
JP1
1
2
3
IN
OU T3
OUT2 OU T4
OUT1 OU T5
EN /SET GN D
8
7
6
5
AAT4290A
TP
TP
TP
R7
330Ω
R6
330Ω
Out5
C4
0.1µF
C5
0.1µF
Out4
R10
R9
330Ω
R8
330Ω
Out3
C6
0.1µF
Out2
C7
0.1µF
C8
0.1µF
Out1
Green
GND
J2
1
2
3
R4
100kΩ
GND
DC+
C2
C1
1µF
1
22pF
C3
GND
0
2
4
0
2
4
0
2
4
SW3
R3
1kΩ
R2
1kΩ
R1
1kΩ
2
X1
20MHz
U2
1
2
3
4
22pF
VDD
GP5
GP4
GP3
VSS
GP0
GP1
GP2
R5
330Ω
8
7
6
GND
5
LED1
RED
PIC12F675
1
3
5
GND
SW2
1
3
5
SW1
1
3
5
GND
Figure 1: AAT4290IJS-1-DB3 Evaluation Board Schematic.
EV-112.2005.06.1.0
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EV-112
AAT4290IJS-1-DB3 EVAL
I/O Expander Switch with Serial Control
Getting Started
The AAT4290IJS-1-DB3 evaluation board is typically mounted on a battery pack. The battery pack holds three
AAA size, conventional alkaline batteries. A jumper is inline with the battery supply for connecting/disconnecting power. There is an additional jumper labeled ON SRL OFF, which provides access to EN/SET. Ensure
that the jumper is in the ON SRL position for normal operation. To apply power to the board, ensure the jumper
is at the ON MCU position. The red LED1 should illuminate indicating that power has been connected.
The AAT4290 may be operated from an external power source. The batteries should be removed from the battery pack. External power may be applied to the DC+ and DC- points on the board. The external power source
should be set from 1.8V to 5.5V before the AAT4290 is turned on by moving the jumper on J1 to the “ON MCU”
position.
There are three buttons on the board (SW1, SW2, and SW3) that enable and disable the ON and OFF state
for the five output channels. Once a button (or a combination of buttons) is toggled, the corresponding LED
for OUT1 to OUT5 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 AAT4290. Detailed operations are listed in
Table 1. Toggling SW1 and SW3 at once, activates the auto-cycling state through the "AAT4290 Output
Settings" table found in the product datasheet. In other words, the microcontroller will submit a burst of edges,
pause, and submit another burst of edges and so on. It will start by submitting 31 edges, next submit 30 edges,
etc.; next, submit 1 edge and then start over. All LEDs should blink five times before the sequence of autocycling. By toggling all three buttons together, all LEDs should turn off.
The AAT4290 outputs can be probed via the test points near the output capacitors (C4 to C8).
Button(s) Pushed
Description
SW1
Toggle on/off of output Channel 1.
SW2
Toggle on/off of output Channel 2.
SW3
Toggle on/off of output Channel 3.
SW1 + SW2
Toggle on/off of output Channel 4.
SW2 + SW3
Toggle on/off of output Channel 5.
SW1 + SW3
Auto cycling. All outputs blinks (on and off) five times and enter binaryincrement mode. Auto cycling repeats three times.
SW1 + SW2 + SW3
Reset. All outputs turn off.
Table 1: User Interface Functionality.
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EV-112.2005.06.1.0
EV-112
AAT4290IJS-1-DB3 EVAL
I/O Expander Switch with Serial Control
Printed Circuit Board
Figure 2: Top Layer (not to scale).
Figure 3: Bottom Layer (not to scale).
AAT4290IJS-1-DB3 EVAL Component Listing
Component
Part#
Description
Manufacturer
U1
AAT4290
AnalogicTech
U2
PIC12F675
SW1 - SW3
R1 - R3
R4
R5
R6-R10
JP1
C1
C2, C3
C4-C8 (optional)
J1, J2
X1
LED1
OUT1-OUT5
PTS645TL50
Chip Resistor
Chip Resistor
Chip Resistor
Chip Resistor
Chip Resistor
ECJ-2YB1A105K
VJ0805A220KXAA
GRM188R71C104KA01D
PRPN401PAEN
X439-ND
CMD15-21SRC/TR8
CMD15-21UGC/TR8
I/O Expander Load Switch with Serial
Control; SC70JW-8 Package
8-bit CMOS, FLASH-Based µC;
8-Pin PDIP Package
Switch Tact, SPST, 5mm
1K, 5%, 1/4W; 1206
100K, 5%, 1/4W; 0805
330K, 5%, 1/4W; 1206
330K, 5%, 1/4W; 0603
0O, 5%; 0805
1µF, 10V, X5R, 10%; 0805
22pF, 50V, NPO, 10%; 0805
0.1µF, 16V, 10%; 0603
Con. Header, 2mm zip
Quartz Crystal 20MHz HC-49US
Red LED; 1206
Green LED; 1206
Microchip
ITT Industries
Vishay
Vishay
Vishay
Vishay
Vishay
Panasonic-ECG
Vishay
Murata
Sullins Electronics
ECS Inc
Chicago Miniature Lamp
Chicago Miniature Lamp
Table 2: Component Listing.
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EV-112
AAT4290IJS-1-DB3 EVAL
I/O Expander Switch with Serial Control
AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work
rights, or other intellectual property rights are implied.
AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice, and advise customers to obtain the latest
version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale
supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability.
AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. Testing and
other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
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