1
AAT4290/4291
DATA SHEET
I/O Ex
p
ander Load Switches with Serial Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013
General Description
The AAT4290 and AAT4291 SmartSwitchTM products are
members of Skyworks' Application Specific Power MOSFET
(ASPM™) product family. The AAT4290 and AAT4291 are
five and three P-channel MOSFETs, respectively, config-
ured for use as a microprocessor I/O expander. Having
independent drain outputs and a common source input,
they operate with an input voltage ranging from 1.8V to
5.5V, making them ideal for 2.5V, 3.3V, or 5V systems, as
well as systems powered by lithium-ion/polymer batter-
ies. Each switch features a 500ns turn-on time. The
switch states are controlled by Skyworks' Simple Serial
Control (S2Cwire™) interface which permits ease of con-
trol and efficiency of size. The quiescent supply current is
very low, typically 4.5A. In shutdown mode, the supply
current is reduced to less than 1A.
The AAT4290 and AAT4291 are offered in a Pb-free,
8-pin SC70JW package specified over the -40°C to
+85°C temperature range.
A typical application circuit is shown in Figure 1. The pin
configurations are shown in Figure 2. A functional block
diagram of the AAT4290/4291 is provided in Figure 3.
Features
• 1.8V to 5.5V Input Voltage Range
• 5 or 3 Independent Load Switches
• S2Cwire Interface
• 1.1 RDS(ON) Per Switch
• Low Quiescent Current
- 4.5A Typical
- 0.1A in Shutdown
• -40°C to +85°C Temperature Range
• 8-Pin SC70JW Package
Applications
• Cell Phones
• I/O Expansion
• Multiple Low Power Switching
• Personal Communication Devices
• Portable Electronic Devices
Typical Application
OUT1
AAT4290 OUT2
OUT3
OUT4
OUT5
IN
EN/SET
GND
COUT1 COUT2 COUT3 COUT4 COUT5
CIN
1μF 0.1μF 0.1μF 0.1μF 0.1μF 0.1μF
INPUT
EN/SET
GND
OUT1
OUT2
OUT3
OUT4
OUT5
GND
Figure 1. Typical Application Circuit.
AAT4290/4291
DATA SHEET
I/O Expander Load Switches with Serial Control
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2
Pin Descriptions
Pin #
Symbol Function
AAT4290 AAT4291
11 IN
Input power supply is connected to the P-channel MOSFET sources. Connect a 1F capaci-
tor 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 S2Cwire 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 output 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.
N/A 2, 3 N/C Not connected.
Pin Configuration
AAT4290 AAT4291
OUT2
OUT1
EN/SET
OUT3
OUT4
OUT5
GND
IN 1
2
3
45
6
7
8
N/C
N/C
EN/SET
OUT3
OUT2
OUT1
GND
IN 1
2
3
45
6
7
8
Figure 2. AAT4290/4291 Pinout − 8-pin SC70JW
(Top View).
3
AAT4290/4291
DATA SHEET
I/O Expander Load Switches with Serial Control
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202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Human body model is a 100pF capacitor discharged through a 1.5k resistor to each pin.
3. Mounted on the board.
4. Derate 4.4mW/°C above 25°C.
Absolute Maximum Ratings1
Symbol Description Value Units
VIN IN to GND -0.3 to 6.0 V
VOUT OUT to GND -0.3 to VIN + 0.3 V
VEN/SET EN/SET to GND -0.3 to 6.0 V
IMAX Maximum Continuous Switch Current 250 mA
TSTORAGE Storage Temperature Range -65 to 150 °C
VESD ESD Rating - HBM24000 V
Thermal Characteristics
Symbol Description Value Units
JA Thermal Resistance3225 °C/W
PDMaximum Power Dissipation (TA = 25°C)4440 mW
AAT4290/4291
DATA SHEET
I/O Expander Load Switches with Serial Control
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4
1. The AAT4290/91 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and cor-
relation with statistical process controls.
Electrical Characteristics
VIN = 5.0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol Description Conditions Min Typ Max Units
VIN Operation Voltage 1.8 5.5 V
IQQuiescent Current VIN = 5.5V, EN/SET = VIN, IOUT = 0, All Switches
ON 4.5 8 A
IQ(OFF) Off Supply Current EN/SET = 0, VIN = 5.5V, VOUT Open 1 A
ISD(OFF) Off Switch Current EN/SET = 0, VIN = 5.5V, VOUTn = 0 0.1 1 A
VUVLO Under-Voltage Lockout VIN Falling 1.2 V
VUVLO(hys) Under-Voltage Lockout Hysteresis 250 mV
RDS(ON) On Resistance
VIN = 1.8V, TA = 25°C 2.5 3.8
VIN = 3.0V, TA = 25°C 1.5 2.2
VIN = 4.2V, TA = 25°C 1.2 1.8
VIN = 5.0V, TA = 25°C 1.1 1.7
TCRDS On Resistance Temperature Coeffi cient 2800 ppm°C
AAT4290-1 and AAT4291-1
TD(ON) Output Turn-On Delay Time VIN = 5V, RLOAD = 500, COUT = 0.1F40ns
TRTurn-On Rise Time VIN = 5V, RLOAD = 500, COUT = 0.1F 270 ns
TD(OFF) Turn-Off Delay Time VIN = 5V, RLOAD = 50040 ns
EN/SET
VEN(L) Enable Threshold Low VIN = 1.8V 0.4 V
VEN(H) Enable Threshold High VIN = 5.5V 1.6 V
TLO EN/SET Low Time VEN/SET < 0.4V 100 ns
THI Minimum EN/SET High Time VIN 2.5V 500 ns
VIN > 2.5V 250
TOEN/SET Off Timeout 2.6 4.0 s
TLAT EN/SET Latch Timeout 2.6 4.0 s
ISINK EN/SET Input Leakage VEN/SET = 5.5V 0.01 1 A
5
AAT4290/4291
DATA SHEET
I/O Expander Load Switches with Serial Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013
Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1F, C OUTX = 0.1F, TA = 25°C.
Quiescent Current vs. Temperature
-40 -20 0 20 40 60 80 100
Temperature (°
°
C)
IQ (
μ
A)
2
2.5
3
3.5
4
4.5
5
5.5
6
VIN = 5.0V
VIN = 3.3V
Quiescent Current vs. Input Voltage
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
IQ (μ
μ
A)
1.5
2
2.5
3
3.5
4
4.5
5
5.5
VIH and VIL vs. Input Voltage
1.5 2.523.534.545.55
Input Voltage (V)
VIH and VIL (V)
VIL
VIH
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
RDS(ON) vs. Input Voltage
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
RDS(ON) (ΩΩ)
0.7
0.9
1.1
1.3
1.5
1.7
1.9
2.1
2.3
2.5
2.7
IO1-5 = 100mA
R
DS1
R
DS2
R
DS5
R
DS3
R
DS4
RDS(ON) vs. Temperature
Temperature (°
°
C)
RDS(ON) (
W
)
-40 -20 0 20 40 60 80 100
0.7
0.8
0.9
1
1.1
1.2
1.3
VIN = 5.0V
IO1-5 = 50mA
RDS1
RDS2
RDS3
RDS4
RDS5
RDS(ON) vs. Temperature
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
-40 -20 0 20 40 60 80 100
Temperature (°
°
C)
RDS(ON) (
W
)
VIN = 5.0V
IO1-5 = 100mA
RDS3
RDS4
RDS5
RDS1
RDS2
AAT4290/4291
DATA SHEET
I/O Expander Load Switches with Serial Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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6
Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1F, C OUTX = 0.1F, TA = 25°C.
EN/SET Latch Timeout vs. Temperature
-40 -20 0 20 40 60 80 100
Temperature (°
°
C)
Latch Timeout, tLAT (
μ
s)
2.2
2.4
2.6
2.8
3
3.2
3.4
VIN = 5.0V
VIN = 3.3V
EN/SET Off Timeout vs. Temperature
-40 -20 0 20 40 60 80 100
Tem
p
erature
(
°
°
C
)
Off Timeout, tO (μs)
2.2
2.4
2.6
2.8
3
3.2
3.4
VIN = 3.3V
VIN = 5.0V
EN/SET Timeout vs. Input Voltage
1.5 2 2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
Timeout (μ
μ
s)
2.5
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
Off Timeout tO
Latch Timeout tLAT
Turn-On Characteristic
(VIN = 5V, RL1 = RL2 = 50Ω
Ω
; CO1 = CO2 = 0.1
μ
F)
Time (2μs/div)
EN/SET
(5V/div)
VO1
(5V/div)
VO2
(5V/div)
Turn-On Characteristic
(VIN = 5V; RL1 = RL2 = 50Ω
Ω
; CO1 = CO2 = 0.1
μ
F)
Time (2μs/div)
EN/SET
(5V/div)
VO1
(5V/div)
VO2
(5V/div)
Turn-On Characteristic
(VIN = 5V; RL1 = RL2 = 50Ω
Ω
; CO1 = CO2 = 0.1
μ
F)
Time (2μs/div)
EN/SET
(5V/div)
VO1
(5V/div)
VO2
(5V/div)
7
AAT4290/4291
DATA SHEET
I/O Expander Load Switches with Serial Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013
Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1F, C OUTX = 0.1F, TA = 25°C.
Turn-On Characteristic
(VIN = 5V; RL1 = RL2 = 50Ω
Ω
; CO1 = CO2 = 0.1
μ
F)
Time (2μs/div)
EN/SET
(5V/div)
VO1
(5V/div)
VO2
(5V/div)
Turn-Off Characteristic
(VIN = 5V; RL1 = RL2 = 50Ω
Ω
; CO1 = CO2 = 0.1
μ
F)
Time (2μs/div)
EN/SET
(5V/div)
VO1
(5V/div)
VO2
(5V/div)
Transition of Outputs
(VIN = 5V; RL1 = RL2 = 50Ω
Ω
; CO1 = CO2 = 0.1
μ
F)
Time (2μs/div)
EN/SET
(5V/div)
VO1
(5V/div)
VO2
(5V/div)
Time (5μ
μ
s/div)
EN/SET
(5V/div)
VO1
(5V/div)
VO2
(100mV/div,
A
C coupled)
Turn-On Transient Characteristic
(VIN = 5V; RL1 = RL2 = 50
Ω
)
AAT4290/4291
DATA SHEET
I/O Expander Load Switches with Serial Control
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8
Functional Description
The AAT4290 consists of five P-channel MOSFET power
switches designed for I/O expansion applications. The
AAT4291 has all of the features offered in the AAT4290,
but integrates three switches instead of five. It operates
with input voltages ranging from 1.8V to 5.5V which,
along with its extremely low operating current, makes it
ideal for battery-powered applications. In cases where
the input voltage drops below 1.8V, the AAT4290
MOSFETs are protected from entering the linear region of
operation by automatically shutting down. In addition,
the TTL-compatible EN/SET pin makes the AAT4290 an
ideal level-shifted load switch. An optional slew rate con-
trolling feature eliminates in-rush current when a MOSFET
is turned on, allowing the AAT4290 to be implemented
with a small input capacitor or no capacitor at all, while
maintaining isolation between channels. During slewing,
the current ramps linearly until it reaches the level
required for the output load condition. The proprietary
control method works by careful control and monitoring
of the MOSFET gate voltage. When the device is switched
ON, the gate voltage is quickly increased to the threshold
level of the MOSFET. Once at this level, the current
begins to slew as the gate voltage is slowly increased
until the MOSFET becomes fully enhanced. Once it has
reached this point, the gate is quickly increased to the
full input voltage and RDS(ON) is minimized.
The ON/OFF state of the five MOSFET switches are con-
trolled by the EN/SET serial data input. An internal con-
trol counter is clocked on the rising edge of the EN/SET
pin and is decoded into the 32 possible states of the
MOSFET (see Table 1). The counter rolls over after 32
clocks and the table repeats. The counter can be clocked
at speeds up to 1MHz, but the count value is not latched
until clocking has stopped and the EN/SET pin has
remained high for approximately 2.6s. The first rising
edge of EN/SET enables the AAT4290 and is counted as
the first clock. To change states, additional low going
clock pulses may be asserted on the EN/SET pin with the
resulting change taking effect after the EN/SET pin has
remained in a high state for TLAT
. The AAT4290 is disabled
after the EN/SET pin has transitioned and remained in a
logic low state for TO.
With the exception of three channel power switches, the
AAT4291 has a similar function to the AAT4290. The ON/
OFF state of the three MOSFET switches are controlled
by the EN/SET serial data input. An internal control
counter is clocked on the rising edge of the EN/SET pin
and is decoded into the eight possible states of the
MOSFET (see Table 2). The counter rolls over after eight
clocks and the table repeats.
Figure 4 shows the timing diagram.
Functional Block Diagram
GND
Control Logic
and Level Shift
S2Cwire Interface
*AAT4290 only
IN OUT1
OUT2
OUT3
OUT4*
OUT5*
EN/SET
UVLO
ROM
Figure 3. AAT4290/4291 Functional Block Diagram.
9
AAT4290/4291
DATA SHEET
I/O Expander Load Switches with Serial Control
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Clock OUT5 OUT4 OUT3 OUT2 OUT1
1 ononononon
2 ononononoff
3 on on on off on
4 on on on off off
5 on on off on on
6 on on off on off
7 on on off off on
8 on on off off off
9 on off on on on
10 on off on on off
11 on off on off on
12 on off on off off
13 on off off on on
14 on off off on off
15 on off off off on
16 on off off off off
17 off on on on on
18 off on on on off
19 off on on off on
20 off on on off off
21 off on off on on
22 off on off on off
23 off on off off on
24 off on off off off
25 off off on on on
26 off off on on off
27 off off on off on
28 off off on off off
29 off off off on on
30 off off off on off
31 off off off off on
32 off off off off off
Table 1: AAT4290 Output Settings.
Clock OUT3 OUT2 OUT1
1ononon
2 on on off
3 on off on
4 on off off
5 off on on
6 off on off
7 off off on
8 off off off
Table 2: AAT4291 Output Settings.
Applications Information
Thermal Considerations
The AAT4290 is designed to deliver continuous output
load currents. Due to its high level of integration, care
must be taken in designing for higher load conditions. If
greater loads are required, outputs can be tied together
to deliver higher power to a given load.
At 25°C ambient, the AAT4290 is capable of dissipating
440mW of power, or 1.14A at 5.0V, for an average cur-
rent of 228mA per output.
At 85°C ambient, the AAT4290 is capable of dissipating
178mW of power, or 0.72A at 5.0V, for an average cur-
rent of 145mA per output.
Output Sequencing
If output sequencing is not necessary, then all of the
outputs will be switched on simultaneously on the first
rising edge of the EN/SET pin. However, if output
sequencing is desired, then a series of pulses on the EN/
SET pin will accomplish this. Each time a new group of
pulses is asserted on EN/SET, the AAT4290/91 internal
control is reset. For example, to sequence the outputs in
order from OUT5 to OUT1, five clocks bursts are input on
the EN/SET pin. From Table 1, the first burst of 16 clocks
turns on OUT5. A following burst of 8 clocks (as the
counter resets) will add OUT4, followed by 4 clocks to
add OUT3, 2 clocks to add OUT2, and 1 clock to add
OUT1. Likewise, the outputs can be turned off in any
order by adding more clock bursts.
Timing Diagram
THI TLO TLAT TD(ON) TO
TRTD(OFF)
OUTn
EN/SET
Figure 4. Timing Diagram.
AAT4290/4291
DATA SHEET
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10
Applications Circuits
Function 1
Function 2
Function 3
Function 4
Function 5
System
µController
GPIO 1
VSUPPLY
1.8 to 5.5V
GPIO 2
GPIO 3
GPIO 4
GPIO 5
EN 1
EN 2
EN 3
EN 4
EN 5
GPIO 2
to
GPIO 5
are now free for
other uses
EN/SET
IN OUT1
OUT2
OUT3
OUT4
OUT5
AAT4290
Figure 5: GPIO I/O Expander
(condense five GPIO control lines to one).
VBATTERY 10μF
1μF
10μF
RRRGRB
BR G
ON/OFF
CLOCK
VIN VOUT
C+
C-
GND GND
IN
OUT1
OUT2
OUT3
EN/SETSHDN
RGB LED
AAT3110IJS-5.0
SC70JW-8: 2x2mm
AAT4291IJS
SC70JW-8: 2x2mm
Figure 6: RGB LED Control
(eliminate three discrete MOSFET switches).
11
AAT4290/4291
DATA SHEET
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202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013
Evaluation Board Description
AAT4290 Evaluation Board
The AAT4290IJS-1-DB3 Evaluation Board is used to test
the performance of the AAT4290. This section describes
the evaluation board and its accompanying user inter-
face. 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 7.
VDD
1
GP5
2
GP4
3
GP3
4
GP2
5
GP1
6
GP0
7
VSS
8
PIC12F675
U2
1μF
C1
1kΩ
R1
1kΩ
R2
1kΩ
R3
330Ω
R5
12 34 5
0
SW1
12 34 5
0
SW2
RED
LED1
12 34 5
0
SW3
IN
1
OUT2
2
OUT1
3
EN/SET
4GN D 5
OU T5 6
OU T4 7
OU T3 8
AAT4290
U1
330Ω
R9
330Ω
R6
R10
330Ω
R7
330Ω
R8
Out5 Out4 Out3 Out2 Out1
Green
1 2 3
J1
JP1
DC- DC+
GND
GND
GND
DC+
1 2 3
J2
100kΩ
R4
GND
1
2
20MHz
X1
22pF
C2
22pF
C3
GND
GND
C6 C7 C8
C5
0.1μF
C4
TP
TP
TP
TP
TP
0.1μF 0.1μF 0.1μF 0.1μF
Figure 7: AAT4290IJS-1-DB3 Evaluation Board Schematic.
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/disconnect-
ing 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 indi-
cating that power has been connected.
The AAT4290 may be operated from an external power
source. The batteries should be removed from the bat-
tery 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 combina-
tion of buttons) is toggled, the corresponding LED for
AAT4290/4291
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12
OUT1 to OUT5 will turn ON or OFF accordingly, depend-
ing 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 3.
Toggling SW1 and SW3 at once, activates the auto-
cycling state through the Table 1 "AAT4290 Output
Settings". 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 but-
tons together, all LEDs should turn off.
The AAT4290 outputs can be probed via the test points
near the output capacitors (C4 to C8).
The evaluation board layer detail is provided in Figures 8
and 9. Table 4 provides the component list for the
AAT4290 evaluation board.
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) fi ve times and enter binary-increment mode. Auto cycling
repeats three times.
SW1 + SW2 + SW3 Reset. All outputs turn off.
Table 3: User Interface Functionality.
Figure 8: Top Layer (not to scale). Figure 9: Bottom Layer (not to scale).
13
AAT4290/4291
DATA SHEET
I/O Expander Load Switches with Serial Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013
Component Part# Description Manufacturer
U1 AAT4290 I/O Expander Load Switch with Serial
Control; SC70JW-8 package Skyworks
U2 PIC12F675 8-bit CMOS, FLASH-based C;
8-Pin PDIP package Microchip
SW1 – SW3 PTS645TL50 Switch Tact, SPST, 5mm ITT Industries
R1 – R3 Chip Resistor 1K, 5%, 1/4W; 1206 Vishay
R4 Chip Resistor 100K, 5%, 1/4W; 0805 Vishay
R5 Chip Resistor 330K, 5%, 1/4W; 1206 Vishay
R6-R10 Chip Resistor 330K, 5%, 1/4W; 0603 Vishay
JP1 Chip Resistor 0, 5%; 0805 Vishay
C1 ECJ-2YB1A105K 1F, 10V, X5R, 10%; 0805 Panasonic-ECG
C2, C3 VJ0805A220KXAA 22pF, 50V, NPO, 10%; 0805 Vishay
C4-C8 (optional) GRM188R71C104KA01D 0.1F, 16V, 10%; 0603 Murata
J1, J2 PRPN401PAEN Con. Header, 2mm zip Sullins Electronics
X1 X439-ND Quartz crystal 20MHz HC-49US ECS Inc
LED1 CMD15-21SRC/TR8 Red LED; 1206 Chicago Miniature Lamp
OUT1-OUT5 CMD15-21UGC/TR8 Green LED; 1206 Chicago Miniature Lamp
Table 4: AAT4290 Evaluation Board Component Listing.
AAT4291 Evaluation Board
This section discusses the AAT4291 evaluation board and
the application of the AAT4291 as an RGB LED driver.
Advanced RGB LED control is realized without having to
use multiple discrete MOSFET switches controlled by
multiple I/O pins from the system processor. Only one
digital I/O pin is needed for complete, independent
brightness control of each of the R, G, and B LEDs.
Using RGB LEDs to generate various colors presents
unique challenges. Among them is a requirement to
pulse width modulate (PWM) three independent LED cur-
rents to accurately control the brightness for each LED
color. The AAT4291 is well suited for this. Using only one
GPIO pin from the system processor, a high PWM rate
can be achieved with complete brightness control for
each LED.
A schematic of the complete circuit is shown in Figure
10.
Getting Started
The evaluation board comes with a battery pack
attached. In this configuration, VIN is supplied from
three standard “AAA” alkaline batteries. Under new con-
ditions for the batteries, the input voltage is generally
4.7V ~ 4.8V and falls off depending on the degree of
discharge and load conditions. If desired, the batteries
can be removed and an independent, DC supply can be
used.
There are five buttons on the board. Their functions are
as follows:
• SW1: Increments through the eight Output Setting
states (Table 2).
• SW2: Increments B_LED duty cycle.
• SW3: Increments G_LED duty cycle.
• SW4: Increments R_LED duty cycle.
• SW5: Brings EN/SET low (shuts down the AAT4291
device).
Notes:
1. Buttons 1 through 4 will automatically increment if
held down.
2. Buttons 2 through 4 are set up so that a user can
independently control the corresponding R, G, or B
LED brightness. This is done by incrementing the
PWM duty cycle through the following states: 0%,
25%, 50%, 75%, 100%, 0%, …
The PIC microcontroller toggles the EN/SET line high and
low at 500kHz. The rise and fall times of the EN/SET
signal are small relative to the period,so THI and TLO are
roughly 1s (see Figure 10). THI and TLO depend on the
C's internal RC oscillator, so the 1s reference is an
approximate figure and subject to the precision of the RC
oscillator.
Figure 11 shows the typical EN/SET signal.
The evaluation board layer detail is provided in Figures
12 through 14. Table 5 provides the component list for
the AAT4290 evaluation board.
AAT4290/4291
DATA SHEET
I/O Expander Load Switches with Serial Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013
14
VOUT
1
GND
2
GND
3
GND
4SHDN 5
C- 6
VIN
7
C+ 8
AAT3110-4.5
U1
IN
1
NC
2
NC
3
EN/SET
4GND 5
OUT1 6
OUT2 7
OUT3 8
ATT4291
U2
BLUE
D1B
RED
D1R
GREEN
D1G
60.4
R9
249
R8
249
R7
10μF
C2
10μF
C1
1μF
C3
1
2
J1 100K
R6
VDD
1
GP5
2
GP4
3
GP3
4GP2 5
GP1 6
GP0 7
VSS 8
PIC12C671
U3
60.4
R10
249
R11
249
R12
RED
D2R
GREEN
D2G
BLUE
D2B
S4
S2
S1
S3
S5
1K
R1
1K
R2
1K
R3
1K
R4
1K
R5
VIN VIN
VIN
GND
1615 SMD 1615 SMD
10μF
C4
0.1μF
C6
VIN
234
1
234
1
Figure 10: AAT4291IJS-1 Evaluation Board Schematic.
Figure 11: Typical EN/SET Signal.
15
AAT4290/4291
DATA SHEET
I/O Expander Load Switches with Serial Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013
Figure 12: Top Layer Silkscreen (not to scale). Figure 13: Top Layer (not to scale).
Figure 14: Bottom Layer (not to scale).
Component Part# Description Manufacturer
U1 AAT3110 Power regulated 4.5V CP;
SC70JW-8 package Skyworks
U2 AAT4291 I/O Expander load switches;
SC70JW-8 package Skyworks
U3 PIC12C671 8-bit CMOSC; 8-pin PDIP package Microchip
OP1, OP2 CSLRGB1-1505 RGB LED, common-cathode; 1505 package CSENG
C1, C2, C4 GRM31CR70J106KA01L 10F, 6.3V, X7R, 10%; 1206 Murata
C3 ECJ-1VB1A105K 1F, 10V, X5R, 10%; 0603 Panasonic-ECG
C6 ECJ-1VB1C104K 0.1F, 16V, X7R, 10%; 0603 Panasonic-ECG
R1 – R5 Chip Resistor 1K, 5%, 1/8W; 0805 Vishay
R6 Chip Resistor 100K, 5%, 1/10W; 0603 Vishay
R7, R12 Chip Resistor 249, 1%, 1/10W; 0805 Vishay
R8, R11 Chip Resistor 249, 1%, 1/10W; 0805 Vishay
R9, R10 Chip Resistor 60.4, 1%, 1/10W; 0805 Vishay
SW1 – SW5 PTS645TL50 Switch Tact, SPST, 5mm ITT Industries
Table 5: AAT4291 Evaluation Board Component Listing.
AAT4290/4291
DATA SHEET
I/O Expander Load Switches with Serial Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013
16
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1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
Ordering Information
Package Marking1Part Number (Tape and Reel)2
SC70JW-8 HSXYY AAT4290IJS-1-T1
SC70JW-8 HCXYY AAT4291IJS-1-T1
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
Package Information
SC70JW-8
0.225
±
0.075
0.45
±
0.10
0.05
±
0.05
2.10
±
0.30
2.00
±
0.20
7
°
±
3
°
4
°
±
4
°
1.75
±
0.10
0.85
±
0.15
0.15
±
0.05
1.10 MAX
0.100
2.20
±
0.20
0.048REF
0.50 BSC 0.50 BSC 0.50 BSC
All dimensions in millimeters.
