AAT4290_AAT4291_202221B.pdf

DATA SHEET
AAT4290/4291
I/O Expander Load Switches with Serial Control
General Description
Features
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, configured 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 batteries. Each switch features a 500ns turn-on time. The
switch states are controlled by Skyworks' Simple Serial
Control (S2Cwire™) interface which permits ease of control and efficiency of size. The quiescent supply current is
very low, typically 4.5μA. In shutdown mode, the supply
current is reduced to less than 1μA.
•
•
•
•
•
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
- 4.5μA Typical
- 0.1μA in Shutdown
• -40°C to +85°C Temperature Range
• 8-Pin SC70JW Package
Applications
•
•
•
•
•
The AAT4290 and AAT4291 are offered in a Pb-free,
8-pin SC70JW package specified over the -40°C to
+85°C temperature range.
Cell Phones
I/O Expansion
Multiple Low Power Switching
Personal Communication Devices
Portable Electronic Devices
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.
Typical Application
INPUT
IN
AAT4290
EN/SET
EN/SET
OUT1
OUT1
OUT2
OUT2
OUT3
OUT3
OUT4
OUT4
OUT5
OUT5
GND
CIN
1μF
COUT1
0.1μF
COUT2
0.1μF
COUT3
0.1μF
GND
COUT4
0.1μF
COUT5
0.1μF
GND
Figure 1. Typical Application Circuit.
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
1
DATA SHEET
AAT4290/4291
I/O Expander Load Switches with Serial Control
Pin Descriptions
Pin #
AAT4290
AAT4291
Symbol
1
1
IN
2
3
7
6
OUT2
OUT1
4
4
EN/SET
5
6
7
8
N/A
5
N/A
N/A
8
2, 3
GND
OUT5
OUT4
OUT3
N/C
Function
Input power supply is connected to the P-channel MOSFET sources. Connect a 1μF capacitor from IN to GND.
P-channel MOSFET drain.
P-channel MOSFET drain.
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.
Ground connection.
P-channel MOSFET drain.
P-channel MOSFET drain.
P-channel MOSFET drain.
Not connected.
Pin Configuration
AAT4290
IN
OUT2
OUT1
EN/SET
AAT4291
1
8
2
7
3
6
4
5
OUT3
OUT4
OUT5
GND
IN
N/C
N/C
EN/SET
1
8
2
7
3
6
4
5
OUT3
OUT2
OUT1
GND
Figure 2. AAT4290/4291 Pinout − 8-pin SC70JW
(Top View).
2
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
DATA SHEET
AAT4290/4291
I/O Expander Load Switches with Serial Control
Absolute Maximum Ratings1
Symbol
VIN
VOUT
VEN/SET
IMAX
TSTORAGE
VESD
Description
IN to GND
OUT to GND
EN/SET to GND
Maximum Continuous Switch Current
Storage Temperature Range
ESD Rating - HBM2
Value
Units
-0.3 to 6.0
-0.3 to VIN + 0.3
-0.3 to 6.0
250
-65 to 150
4000
V
V
V
mA
°C
V
Value
Units
225
440
°C/W
mW
Thermal Characteristics
Symbol
JA
PD
Description
Thermal Resistance3
Maximum Power Dissipation (TA = 25°C)4
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.
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
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DATA SHEET
AAT4290/4291
I/O Expander Load Switches with Serial Control
Electrical Characteristics
VIN = 5.0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol
VIN
IQ
IQ(OFF)
ISD(OFF)
VUVLO
VUVLO(hys)
RDS(ON)
Description
TO
TLAT
ISINK
Min
Operation Voltage
Quiescent Current
Off Supply Current
Off Switch Current
Under-Voltage Lockout
Under-Voltage Lockout Hysteresis
On Resistance
TCRDS
On Resistance Temperature Coefficient
AAT4290-1 and AAT4291-1
Output Turn-On Delay Time
TD(ON)
TR
Turn-On Rise Time
TD(OFF)
Turn-Off Delay Time
EN/SET
VEN(L)
Enable Threshold Low
VEN(H)
Enable Threshold High
TLO
EN/SET Low Time
THI
Conditions
Minimum EN/SET High Time
EN/SET Off Timeout
EN/SET Latch Timeout
EN/SET Input Leakage
Typ
1.8
VIN = 5.5V, EN/SET = VIN, IOUT = 0, All Switches
ON
EN/SET = 0, VIN = 5.5V, VOUT Open
EN/SET = 0, VIN = 5.5V, VOUTn = 0
VIN Falling
VIN
VIN
VIN
VIN
=
=
=
=
1.8V,
3.0V,
4.2V,
5.0V,
TA
TA
TA
TA
=
=
=
=
4.5
0.1
1.2
250
2.5
1.5
1.2
1.1
2800
25°C
25°C
25°C
25°C
VIN = 5V, RLOAD = 500, COUT = 0.1μF
VIN = 5V, RLOAD = 500, COUT = 0.1μF
VIN = 5V, RLOAD = 500
VIN = 1.8V
VIN = 5.5V
VEN/SET < 0.4V
VIN ≤ 2.5V
VIN > 2.5V
VEN/SET = 5.5V
Max
Units
5.5
V
8
μA
1
1
μA
μA
V
mV
3.8
2.2
1.8
1.7
ppm°C
40
270
40
ns
ns
ns
0.4
1.6
100
2.6
2.6
0.01

500
250
4.0
4.0
1
V
V
ns
ns
μs
μs
μA
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 correlation with statistical process controls.
4
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
DATA SHEET
AAT4290/4291
I/O Expander Load Switches with Serial Control
Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1μF, COUTX = 0.1μF, TA = 25°C.
Quiescent Current vs. Temperature
Quiescent Current vs. Input Voltage
6
5.5
5.5
5
VIN = 5.0V
5
4.5
IQ (μ
μA)
IQ (μA)
4.5
4
3.5
VIN = 3.3V
3
4
3.5
3
2.5
2.5
2
2
1.5
-40
-20
0
20
40
60
80
100
1.5
2.0
2.5
3.0
Temperature (°°C)
VIH and VIL vs. Input Voltage
2.1
RDS(ON) (Ω
Ω)
VIH and VIL (V)
1
0.9
VIL
0.8
RDS5
1.9
1.7
RDS3
RDS4
0.7
1.5
0.5
1.5
2
2.5
3
3.5
4
4.5
5
2.0
2.5
5.5
RDS(ON) vs. Temperature
1.1
RDS2
1.2
RDS(ON) (W)
RDS1
RDS5
RDS4
RDS3
0.8
-20
VIN = 5.0V
IO1-5 = 100mA
1.3
0.9
0
20
RDS1
1.1
Temperature (°°C)
60
4.0
4.5
5.0
5.5
80
100
RDS2
RDS5
1.0
RDS4
0.9
RDS3
0.8
40
3.5
RDS(ON) vs. Temperature
1.4
VIN = 5.0V
IO1-5 = 50mA
3.0
Input Voltage (V)
Input Voltage (V)
RDS(ON) (W)
RDS2
1.3
0.9
0.6
RDS1
1.5
1.1
0.7
-40
5.5
2.3
1.1
0.7
5.0
IO1-5 = 100mA
2.5
VIH
1.2
1
4.5
2.7
1.3
1.2
4.0
RDS(ON) vs. Input Voltage
1.4
1.3
3.5
Input Voltage (V)
0.7
-40
-20
0
20
40
60
80
100
Temperature (°°C)
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
5
DATA SHEET
AAT4290/4291
I/O Expander Load Switches with Serial Control
Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1μF, COUTX = 0.1μF, TA = 25°C.
EN/SET Latch Timeout vs. Temperature
EN/SET Off Timeout vs. Temperature
3.4
3.2
Off Timeout, tO (μs)
Latch Timeout, tLAT (μs)
3.4
3
2.8
VIN = 3.3V
2.6
VIN = 5.0V
2.4
2.2
3.2
3
VIN = 3.3V
2.8
2.6
VIN = 5.0V
2.4
2.2
-40
-20
0
20
40
60
80
100
-40
Temperature (°°C)
-20
0
20
40
60
80
Temperature (°°C)
EN/SET Timeout vs. Input Voltage
Turn-On Characteristic
(VIN = 5V, RL1 = RL2 = 50Ω
Ω; CO1 = CO2 = 0.1μF)
4.3
4.1
Timeout (μ
μs)
3.9
VO2
(5V/div)
3.7
3.5
3.3
VO1
(5V/div)
Off Timeout tO
3.1
2.9
2.7
EN/SET
(5V/div)
Latch Timeout tLAT
2.5
1.5
2
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
Time (2μs/div)
Turn-On Characteristic
Turn-On Characteristic
(VIN = 5V; RL1 = RL2 = 50Ω
Ω; CO1 = CO2 = 0.1μF)
VO2
(5V/div)
VO2
(5V/div)
VO1
(5V/div)
VO1
(5V/div)
EN/SET
(5V/div)
EN/SET
(5V/div)
Time (2μs/div)
6
(VIN = 5V; RL1 = RL2 = 50Ω
Ω; CO1 = CO2 = 0.1μF)
Time (2μs/div)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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100
DATA SHEET
AAT4290/4291
I/O Expander Load Switches with Serial Control
Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1μF, COUTX = 0.1μF, TA = 25°C.
Turn-On Characteristic
Turn-Off Characteristic
(VIN = 5V; RL1 = RL2 = 50Ω
Ω; CO1 = CO2 = 0.1μF)
(VIN = 5V; RL1 = RL2 = 50Ω
Ω; CO1 = CO2 = 0.1μF)
VO2
(5V/div)
VO2
(5V/div)
VO1
(5V/div)
VO1
(5V/div)
EN/SET
(5V/div)
EN/SET
(5V/div)
Time (2μs/div)
Time (2μs/div)
Transition of Outputs
Turn-On Transient Characteristic
(VIN = 5V; RL1 = RL2 = 50Ω
Ω; CO1 = CO2 = 0.1μF)
(VIN = 5V; RL1 = RL2 = 50Ω)
VO2
(100mV/div,
AC coupled)
VO2
(5V/div)
VO1
(5V/div)
VO1
(5V/div)
EN/SET
(5V/div)
EN/SET
(5V/div)
Time (2μs/div)
Time (5μ
μs/div)
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DATA SHEET
AAT4290/4291
I/O Expander Load Switches with Serial Control
Functional Block Diagram
OUT1
IN
OUT2
OUT3
OUT4*
OUT5*
UVLO
Control Logic
and Level Shift
ROM
EN/SET
S2Cwire Interface
GND
*AAT4290 only
Figure 3. AAT4290/4291 Functional Block Diagram.
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 controlling 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.
8
The ON/OFF state of the five 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 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 2.6μs. 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.
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
DATA SHEET
AAT4290/4291
I/O Expander Load Switches with Serial Control
Timing Diagram
OUTn
THI
TLO
TLAT
TD(ON) TR
TO
TD(OFF)
EN/SET
Figure 4. Timing Diagram.
Clock
OUT5
OUT4
OUT3
OUT2
OUT1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
on
on
on
on
on
on
on
on
off
off
off
off
off
off
off
off
on
on
on
on
on
on
on
on
off
off
off
off
off
off
off
off
on
on
on
on
off
off
off
off
on
on
on
on
off
off
off
off
on
on
on
on
off
off
off
off
on
on
on
on
off
off
off
off
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
Table 1: AAT4290 Output Settings.
Clock
OUT3
OUT2
OUT1
1
2
3
4
5
6
7
8
on
on
on
on
off
off
off
off
on
on
off
off
on
on
off
off
on
off
on
off
on
off
on
off
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 current 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 current 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.
Table 2: AAT4291 Output Settings.
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
9
DATA SHEET
AAT4290/4291
I/O Expander Load Switches with Serial Control
Applications Circuits
VSUPPLY
1.8 to 5.5V
AAT4290
IN
GPIO 1
EN/SET
OUT1
EN 1
OUT2
Function 1
OUT3
System
µController
OUT4
EN 2
OUT5
GPIO 2
GPIO 2
to
GPIO 5
are now free for
other uses
GPIO 3
GPIO 4
GPIO 5
EN 3
EN 4
EN 5
Function 2
Function 3
Function 4
Function 5
Figure 5: GPIO I/O Expander
(condense five GPIO control lines to one).
VBATTERY
AAT3110IJS-5.0
SC70JW-8: 2x2mm
AAT4291IJS
SC70JW-8: 2x2mm
VIN
IN
VOUT
OUT1
OUT2
10μF
C+
10μF
OUT3
RGB LED
R
1μF
ON/OFF
SHDN
CGND
G
B
EN/SET
GND
RR
CLOCK
RG
RB
Figure 6: RGB LED Control
(eliminate three discrete MOSFET switches).
10
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
DATA SHEET
AAT4290/4291
I/O Expander Load Switches with Serial Control
Evaluation Board Description
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 7.
AAT4290 Evaluation Board
The AAT4290IJS-1-DB3 Evaluation Board is used to test
the performance of the AAT4290. This section describes
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
AAT4290
TP
TP
TP
R7
330Ω
R6
330Ω
Out5
C4
0.1μF
C5
0.1μF
Out4
R10
R9
330Ω
R8
330Ω
C6
0.1μF
Out3
Out2
C7
0.1μF
Out1
C8
0.1μF
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
1
2
3
4
22pF
R5
330Ω
U2
VDD
GP5
GP4
GP3
VSS
GP0
GP1
GP2
8
7
6
GND
5
LED1
RED
PIC12F675
GND
1
3
5
SW2
1
3
5
SW1
1
3
5
GND
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/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
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11
DATA SHEET
AAT4290/4291
I/O Expander Load Switches with Serial Control
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 3.
Toggling SW1 and SW3 at once, activates the autocycling 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 buttons 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
SW2
SW3
SW1 + SW2
SW2 + SW3
Toggle on/off of output Channel 1.
Toggle on/off of output Channel 2.
Toggle on/off of output Channel 3.
Toggle on/off of output Channel 4.
Toggle on/off of output Channel 5.
Auto cycling. All outputs blinks (on and off) five times and enter binary-increment mode. Auto cycling
repeats three times.
Reset. All outputs turn off.
SW1 + SW3
SW1 + SW2 + SW3
Table 3: User Interface Functionality.
Figure 8: Top Layer (not to scale).
12
Figure 9: Bottom Layer (not to scale).
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DATA SHEET
AAT4290/4291
I/O Expander Load Switches with Serial Control
Component
Part#
U1
AAT4290
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
Description
Manufacturer
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
0Ω, 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
Skyworks
Microchip
ITT Industries
Vishay
Vishay
Vishay
Vishay
Vishay
Panasonic-ECG
Vishay
Murata
Sullins Electronics
ECS Inc
Chicago Miniature Lamp
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 currents 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 conditions 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.
2.
Buttons 1 through 4 will automatically increment if
held down.
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 1μs (see Figure 10). THI and TLO depend on the
μC's internal RC oscillator, so the 1μs 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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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13
DATA SHEET
AAT4290/4291
I/O Expander Load Switches with Serial Control
U1
1
2
C2
10μF
3
4
VOUT
GND
GND
GND
C+
VIN
CSHDN
8
7
C3
1μF
6
5
U2
1
AAT3110-4.5
2
R6
VIN
VIN
4
100K
J1
GND
3
1
8
7
6
5
ATT4291
C1
10μF
2
IN
OUT3
NC
OUT2
OUT1
NC
EN/SET GND
R9
60.4
VIN
VIN
R10
60.4
R11
249
R1
1K
R2
1K
R3
1K
R4
1K
R5
1K
1
2
4
VDD
GP5
GP4
GP3
PIC12C671
3
2
2
3
4
VSS
GP0
GP1
GP2
D2R
RED
D2G
GREEN
D2B
BLUE
8
7
6
5
D1R
RED
D1G
GREEN
D1B
BLUE
1
1615 SMD
1
1615 SMD
S2
S3
S4
S5
Figure 10: AAT4291IJS-1 Evaluation Board Schematic.
Figure 11: Typical EN/SET Signal.
14
R12
249
U3
3
S1
R7
249
C4
10μF
4
C6
0.1μF
R8
249
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DATA SHEET
AAT4290/4291
I/O Expander Load Switches with Serial Control
Figure 12: Top Layer Silkscreen (not to scale).
Figure 13: Top Layer (not to scale).
Figure 14: Bottom Layer (not to scale).
Component
Part#
U1
AAT3110
U2
AAT4291
U3
OP1, OP2
C1, C2, C4
C3
C6
R1 – R5
R6
R7, R12
R8, R11
R9, R10
SW1 – SW5
PIC12C671
CSLRGB1-1505
GRM31CR70J106KA01L
ECJ-1VB1A105K
ECJ-1VB1C104K
Chip Resistor
Chip Resistor
Chip Resistor
Chip Resistor
Chip Resistor
PTS645TL50
Description
μPower regulated 4.5V CP;
SC70JW-8 package
I/O Expander load switches;
SC70JW-8 package
8-bit CMOSμC; 8-pin PDIP package
RGB LED, common-cathode; 1505 package
10μF, 6.3V, X7R, 10%; 1206
1μF, 10V, X5R, 10%; 0603
0.1μF, 16V, X7R, 10%; 0603
1K, 5%, 1/8W; 0805
100K, 5%, 1/10W; 0603
249, 1%, 1/10W; 0805
249, 1%, 1/10W; 0805
60.4, 1%, 1/10W; 0805
Switch Tact, SPST, 5mm
Manufacturer
Skyworks
Skyworks
Microchip
CSENG
Murata
Panasonic-ECG
Panasonic-ECG
Vishay
Vishay
Vishay
Vishay
Vishay
ITT Industries
Table 5: AAT4291 Evaluation Board Component Listing.
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
15
DATA SHEET
AAT4290/4291
I/O Expander Load Switches with Serial Control
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
SC70JW-8
SC70JW-8
HSXYY
HCXYY
AAT4290IJS-1-T1
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
2.20 ± 0.20
1.75 ± 0.10
0.50 BSC 0.50 BSC 0.50 BSC
0.225 ± 0.075
2.00 ± 0.20
0.100
7° ± 3°
0.45 ± 0.10
4° ± 4°
0.05 ± 0.05
0.15 ± 0.05
1.10 MAX
0.85 ± 0.15
0.048REF
2.10 ± 0.30
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
Copyright © 2012, 2013 Skyworks Solutions, Inc. All Rights Reserved.
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service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no
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THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR
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Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product
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Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for
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16
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202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013