AAT AAT4296 Five/six channel push/pull i/o expander Datasheet

AAT4296/98
Five/Six Channel Push/Pull I/O Expander
General Description
Features
The AAT4296/98 SmartSwitch is a member of
AnalogicTech's Application Specific Power MOSFET™ (ASPM™) product family. The AAT4296/98
is comprised of five/six push/pull output switches
that gate each respective output between a common
input supply and ground. This device is targeted for
I/O expansion applications, but can also be used for
a combination of general purposes to simplify power
switching with an off state load discharge.
•
•
•
•
•
•
•
•
The AAT4296/98 operates over an input voltage
range of 1.8V to 5.5V, making it ideal for batterypowered applications. The state of each output
channel is controlled with a single GPIO via the
EN/SET pin using AnalogicTech's Simple Serial
Control™ (S2Cwire™) interface. When EN/SET is
pulled to logic high, the device is enabled and consumes 3µA of typical quiescent current. In the off
state, each output is pulled low to ground to affect
a logic low state for I/O expander or power switching applications; this circuit will act as a load discharge function to rapidly turn off a load circuit.
SmartSwitch™
VIN Range: 1.8V to 5.5V
Independent Push/Pull Channels
— AAT4296: Five Channels
— AAT4298: Six Channels
User-Programmable Interface
Single GPIO Controls State of Each Output
Optional Fast Auto-Discharge
Low Quiescent Current: 3µA Typical
Temperature Range: -40°C to +85°C
Available in Pb-Free Packages:
— AAT4296: 8-Pin SC70JW
— AAT4298: 10-Pin SC70JW and
12-Pin TSOPJW
Applications
•
•
•
•
Cell Phones
Multiple Low Power Switching
Personal Communication Devices
Portable Electronic Devices
Rated over the -40°C to +85°C temperature range,
the AAT4296 is offered in a Pb-free 8-pin SC70JW
package, and the AAT4298 is offered in both a Pbfree 10-pin SC70JW and a Pb-free 12-pin
TSOPJW package.
Typical Application
VCC Input
VCC
OUT1
OUT 1
OUT2
OUT 2
AAT4298
EN/SET Input
EN/SET
OUT3
OUT 3
OUT4
OUT 4
OUT5
OUT 5
OUT6
OUT 6
GND
4296.2006.12.1.3
1
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
Pin Descriptions
Pin #
AAT4296
AAT4298
SC70JW-10
AAT4298
TSOPJW-12
Symbol
Function
1
2
3
4
7
8
9
10
8
9
10
11
VCC
OUT2
OUT1
EN/SET
5
6
7
8
N/A
N/A
1
3
4
5
6
2
2
3
4
5
7
1, 6, 12
GND
OUT5
OUT4
OUT3
OUT6
N/C
Input supply voltage.
Channel 2 output pin.
Channel 1 output pin.
Input control pin using S2Cwire serial interface. The device
records rising edges of the clock and decodes them into 32
(AAT4296) or 64 (AAT4298) states controlling the ON/OFF
states of the outputs. See Table 1 for output settings. In addition, a logic low forces the device into shutdown mode, reducing the supply current to less than 1µA. This pin should not be
left floating.
Ground.
Channel 5 output pin.
Channel 4 output pin.
Channel 3 output pin.
Channel 6 output pin.
Not connected.
Pin Configuration
AAT4296
SC70JW-8
(Top View)
VCC
OUT2
OUT1
EN/SET
2
1
8
2
7
3
6
4
5
AAT4298
SC70JW-10
(Top View)
OUT3
OUT4
OUT5
GND
GND
N/C
OUT5
OUT4
OUT3
1
10
2
9
3
8
4
7
5
6
AAT4298
TSOPJW-12
(Top View)
EN/SET
OUT1
OUT2
VCC
OUT6
N/C
GND
OUT5
OUT4
OUT3
N/C
1
12
2
11
3
10
4
9
5
8
6
7
N/C
EN/SET
OUT1
OUT2
VCC
OUT6
4296.2006.12.1.3
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
Absolute Maximum Ratings1
Symbol
VCC to GND
OUTx to GND
EN/SET
TJ
Description
Input to GND
Output (Source) to GND
EN/SET to GND
Operating Junction Temperature Range
Value
Units
-0.3 to 6.0
-0.3 to VIN + 0.3
-0.3 to 6.0
-40 to +150
V
V
V
°C
Value
Units
Thermal Information
Symbol
Description
θJA
Thermal Resistance2
PD
Maximum Power Dissipation3
SC70JW-8, SC70JW-10
TSOPJW-12
SC70JW-8, SC70JW-10
TSOPJW-12
225
160
440
625
°C/W
mW
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. Mounted on an FR4 board.
3. Derate 4.4mW/°C above 25°C.
4296.2006.12.1.3
3
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
Electrical Characteristics1
VCC = 5.0V; TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol
VCC
IQ
Description
Supply Voltage Range
Quiescent Current
On Resistance P-Channel
RDS(ON)
On Resistance N-Channel
TCRDS
TON
TOFF
EN/SET
VEN(L)
VEN(H)
TEN/SET LO
TEN/SET_HI_MIN
TEN/SET_HI_MAX
TOFF
TLAT
IEN/SET
Conditions
On Resistance
Temperature Coefficient
Output Turn-On Time2
Output Turn-Off Time3
Enable Threshold Low
Enable Threshold High
EN/SET Low Time
Minimum EN/SET High Time
Maximum EN/SET High Time
EN/SET Off Timeout
EN/SET Latch Timeout
EN/SET Input Leakage
Min
Typ
Max
Units
5.5
10
V
3.0
1.8
EN/SET = VCC = 5V, IOUT = 0,
All Switches ON
EN/SET = GND, VCC = 5V,
OUTx = Open
VCC = 5V
VCC = 3.6V
VCC = 5V
VCC = 3.6V
1.0
2.5
3.0
1.9
2.0
6.0
7.0
6.0
7.0
2800
VCC = 5V, COUT = 100nF; TA = 25°C
VCC = 5V, COUT = 100nF; TA = 25°C
VIN = 1.8V
VIN = 5.5V
µA
1.6
0.8
1.4
0.5
ppm/°C
2.7
2.1
µs
µs
0.4
V
V
µs
ns
µs
µs
µs
µA
75
50
-1
Ω
75
500
500
1
1. The AAT4296/98 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.
2. TON is the time after latch timeout to 90% of the output voltage. See Figure 1.
3. TOFF is the time after off timeout to 10% of the output voltage. See Figure 1.
4
4296.2006.12.1.3
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1µF, COUTx = 0.1µF, TA = 25°C.
Quiescent Current vs. Input Voltage
Quiescent Current vs. Temperature
3.5
Quiescent Current (μA)
Quiescent Current (μ
μA)
3.5
3.0
85°C
2.5
2.0
1.5
1.0
-40°C
25°C
0.5
0.0
1.5
2
2.5
3
3.5
4
4.5
5
3.0
VCC = 5.0V
2.5
2.0
1.5
VCC = 3.6V
1.0
0.5
-40
5.5
-20
0
40
60
80
100
Temperature (°°C)
Input Voltage (V)
VIH vs. Input Voltage
VIL vs. Input Voltage
1.2
1.0
1.1
0.9
-40°C
1.0
-40°C
0.8
VIL (V)
VIH (V)
20
0.9
85°C
0.8
85°C
0.6
25°C
25°C
0.7
0.7
0.5
0.6
0.4
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
1.5
2.0
2.5
Input Voltage (V)
3.0
3.5
4.0
4.5
5.0
5.5
Input Voltage (V)
P-Channel RDS(ON) vs. Input Voltage
P-Channel RDS(ON) vs. Temperature
(ILOAD = 100mA)
(ILOAD = 100mA)
3.3
25
3.1
RDS(ON) (Ω)
RDS(ON) (Ω
Ω)
20
15
RDS2
10
RDS3
5
0
RDS1
2.5
3.0
3.5
4.0
Input Voltage (V)
4296.2006.12.1.3
RDS3
2.5
2.3
RDS1
RDS2
RDS4
RDS5
1.9
RDS5 RDS4
2.0
RDS6
2.7
2.1
RDS6
1.5
2.9
4.5
5.0
5.5
1.7
-40
-20
0
20
40
60
80
100
Temperature (°°C)
5
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1µF, COUTx = 0.1µF, TA = 25°C.
N-Channel RDS(ON) vs. Input Voltage
N-Channel RDS(ON) vs. Temperature
(ILOAD = 100mA)
(ILOAD = 100mA)
4.0
2.9
2.6
RDS6
3.0
RDS3
RDS4
RDS(ON) (Ω)
RDS(ON) (Ω
Ω)
3.5
2.5
2.0
RDS2
2.0
2.5
3.0
3.5
4.0
4.5
5.0
RDS5
-40
-20
0
40
60
80
Temperature (°°C)
P-Channel RDS(ON) vs. Temperature
N-Channel RDS(ON) vs. Temperature
(VCC = 3.6V; ILOAD = 100mA)
(VCC = 3.6V; ILOAD = 100mA)
100
3.5
RDS3
3.1
RDS6
3.0
RDS5
RDS1
2.8
RDS(ON) (Ω)
3.4
RDS4
2.0
1.5
0.0
-20
0
20
RDS5
RDS1
RDS2
0.5
2.2
-40
RDS4
RDS3
RDS6
2.5
1.0
RDS2
2.5
40
60
80
100
-40
-20
0
Temperature (°°C)
20
40
60
80
100
Temperature (°°C)
EN/SET Latch Timeout vs. Temperature
EN/SET Off Timeout vs. Temperature
350
350
300
Off Timeout, TOFF (μs)
Latch Timeout, TLAT (µs)
20
Input Voltage (V)
3.7
VCC = 5.0V
250
200
VCC = 3.3V
150
100
VCC = 1.8V
50
300
VCC = 5.0V
250
200
VCC = 3.3V
150
100
VCC = 1.8V
50
-40
-20
0
20
40
Temperature (°C)
6
RDS1
RDS2
0.8
5.5
4.0
RDS(ON) (Ω)
1.7
1.1
RDS1
1.0
1.5
2.0
1.4
RDS5
1.5
RDS4
RDS3
RDS6
2.3
60
80
100
-40
-20
0
20
40
60
80
100
Temperature (°C)
4296.2006.12.1.3
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1µF, COUTx = 0.1µF, TA = 25°C.
EN/SET Timeout vs. Input Voltage
290
Turn-On and Turn-Off Time
vs. Temperature
TLATCH
2.0
1.6
230
Time (μs)
Timeout (μs)
260
TOFF
200
170
140
TON (Rise Time)
1.2
0.8
TOFF (Fall Time)
0.4
110
80
1.5
2
2.5
3
3.5
4
4.5
5
5.5
0.0
-40
-20
Turn-On Characteristic
VOUT1
(5V/div)
5V
VOUT1
(5V/div)
0V
5V
VOUT2
(5V/div)
VOUT2
(5V/div)
0V
Turn-On Characteristic
0V
5V
0V
5V
0V
Turn-On Characteristic
VOUT1
(5V/div)
VOUT2
(5V/div)
5V
VOUT1
(5V/div)
0V
5V
VOUT2
(5V/div)
0V
Time (50μs/div)
4296.2006.12.1.3
(RLOAD1 = RLOAD2 = 100Ω
Ω; COUT1 = COUT2 = 0.1μF)
EN/SET
(5V/div)
0V
100
Time (50μs/div)
(RLOAD1 = RLOAD2 = 100Ω
Ω; COUT1 = COUT2 = 0.1μF)
5V
80
5V
Time (50μs/div)
EN/SET
(5V/div)
60
(RLOAD1 = RLOAD2 = 100Ω
Ω; COUT1 = COUT2 = 0.1μF)
EN/SET
(5V/div)
0V
40
Turn-On Characteristic
(RLOAD1 = RLOAD2 = 100Ω
Ω; COUT1 = COUT2 = 0.1μF)
5V
20
Temperature (°°C)
Input Voltage (V)
EN/SET
(5V/div)
0
5V
0V
5V
0V
5V
0V
Time (50μs/div)
7
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1µF, COUTx = 0.1µF, TA = 25°C.
Transition of Outputs
Turn-Off Characteristic
(RLOAD1 = RLOAD2 = 100Ω
Ω; COUT1 = COUT2 = 0.1μF)
EN/SET
(5V/div)
VOUT1
(5V/div)
VOUT2
(5V/div)
5V
(RLOAD1 = RLOAD2 = 100Ω; COUT1 = COUT2 = 0.1µF)
EN/SET
(5V/div)
0V
5V
0V
5V
5V
VOUT1
(5V/div)
0V
0V
5V
5V
VOUT2
(5V/div)
0V
Time (50μs/div)
0V
Time (50µs/div)
Turn-On Transient Characteristic
(RLOAD1 = RLOAD2 = 100Ω; COUT1 = COUT2 = 0.1µF)
EN/SET
(5V/div)
VOUT1
(5V/div)
VOUT2
(100mV/div,
AC coupled)
5V
0V
5V
0V
5V
Time (50µs/div)
8
4296.2006.12.1.3
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
Functional Block Diagram
VCC
AAT4298
OUT1
EN/SET
OUT2
S2Cwire
Serial
Interface
OUT3
OUT4
OUT5
OUT6
GND
Functional Description
The AAT4296/98 is comprised of five/six push/pull
output slew rate limited load switches primarily targeted for microcontroller general purpose
input/output (I/O) expansion applications. Each
push/pull output is supplied by the common VCC
input and is controlled via the digital EN/SET input
pin. When a given output is enabled, the voltage
source applied to the VCC pin is then switched to
the respective output. The high-side P-channel
MOSFET transistor has a typical on resistance
(RDS(ON)) of 3Ω when operating from a 3.6V supply.
4296.2006.12.1.3
When a respective output is disabled or turned off,
the given output pin is then connected to ground
through a low side N-channel MOSFET with a typical on resistance (RDS(ON)) of 2Ω. This circuit architecture affects a simple logic control with the high
level based on the applied VCC. For the AAT4296,
this creates a 1-to-5 I/O expander, and for the
AAT4298 this creates a 1-to-6 I/O expander. Both
the AAT4296 and AAT4298 have been designed to
operate with an input voltage range of 1.8V to 5.5V,
making them ideal for battery-powered applications.
9
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
These devices may also be used for load switching
applications, as well as I/O expansion. Since the
VCC is gated to each output through a slew rate limited low on-resistance switch, they are ideal for
controlling applications circuits with light load current requirements. Such applications could include
simple LED function indicator lamps, RGB LED
fashion lighting, audio and RF circuits, or any other
system with a power requirement that does not
exceed the thermal dissipation limits of the load
switch and device package.
Each device push/pull output may be represented
by the following circuit and simplified equivalent
model (Figures 1 and 2):
VCC
Control
OUT
Figure 1: Push/Pull Output Circuit.
The state of each output is controlled via the
EN/SET pin using AnalogicTech's S2Cwire interface. To enable a respective switch, a series of
clocked pulses should be applied to the EN/SET
pin. The number of pulses clocked will determine
the switch configuration based on the truth table
shown in Table 1. At the end of the serial pulse
data set, the EN/SET set pin should be held high
to then latch the clocked data and enable the
desired switch configuration. When the device is
enabled with the EN/SET held to a logic high state,
the device quiescent current consumption will typically increase to 3µA and normal ambient room
temperatures. If output sequencing of the switches
is not necessary, all of the outputs will be switched
on simultaneously on the first rising edge of the
EN/SET pin by simply pulling the EN/SET to a
logic high level. The default switch position for
one clock pulse is all switches "on." However, if
output sequencing is desired, a series of pulses on
the EN/SET pin will set the outputs to the desired
state (refer to Table 1 for output settings).
The AAT4296/98 offers two different options when
the switches are in the off state. For applications
with an active pull down or auto-discharge
requirement, the internal N-channel switch will
connect the output node to ground with a series
resistance of 2Ω.
S2Cwire Serial Interface
VCC
The ON/OFF state of the output is 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 32/64 possible
states (see Table 1).
3Ω
OUT
Control
2Ω
Figure 2: Simplified Equivalent Model.
10
4296.2006.12.1.3
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
AAT4298
AAT4298
AAT4296 (only)
Clock OUT6 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
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
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
Clock
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
OUT6 OUT5 OUT4 OUT3 OUT2 OUT1
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
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: Output Settings.
4296.2006.12.1.3
11
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
The S2Cwire interface relies on the number of rising edges of the EN/SET pin to address and load
the registers. S2Cwire latches data or address
after the EN/SET pin has been held high for time
TLAT. The interface records rising edges of the
EN/SET pin and decodes them into 32 (for
AAT4296) or 64 (for AAT4298) different states, as
indicated in Table 1. There are 32 (for AAT4296)/
64 (for AAT4298) different sequences for controlling individual turn-on/turn-off of each switch. The
counter can be clocked at speeds up to 1MHz,
such that intermediate states are not visible.
Alternatively, the EN/SET clock pulses may be
entered one at a time for desired setting. The first
rising edge of EN/SET enables the IC and turns all
the switches ON. Once the final clock cycle is
received, the EN/SET pin is held high to maintain
the device setting. The device is disabled 500µs
(TOFF) after the EN/SET pin transitions to a logic
low state.
OUTn
TH
TL
TLAT
TON
TO
TOFF
EN/SET
Figure 3: Timing Diagram.
Applications Information
CIN should be located as close to the device VIN pin
as practically possible.
The AAT4296 and AAT4298 have been designed
so that no external parts are required for the device
to function as a general purpose I/O expander.
Such external parts could include bypass capacitors, or pull-up or pull-down resistors.
There is no specific capacitor equivalent series
resistance (ESR) requirement for CIN; however, for
higher current operation, ceramic capacitors are recommended for CIN due to their inherent capability
over tantalum or aluminum electrolytic capacitors to
withstand input current surges from low impedance
sources, such as batteries in portable devices.
For applications which may use some or all of the
output to switch light load current levels to application circuits, good engineering practice would dictate the use of small bypass capacitors place on
the VCC input and each output which is being used
to conduct current to a load. The use of small
ceramic capacitors between the input and output
nodes to ground will aid in reducing line and load
transient response effects. Refer to the application
schematic of Figure 4 for an example for placing
bypass capacitors.
Input Capacitor
Typically a 0.1µF to 1µF capacitor is recommended for CIN in most applications. A CIN capacitor is
not required for basic operation; however, CIN is
useful in preventing load transient effects from
affecting upstream circuits when internal switches
are enabled to their respective output load circuits.
12
Output Capacitor
For typical applications where the AAT4696/98 is
used for I/O expansion, no output capacitors are
required. Many other common applications such
as controlling LED indicator lamps in portable products do not require an output capacitor because
the end load is not sensitive to device turn-on transient effects.
For improved load transient response in systems
using the AAT4296/98 for load switching, the addition of a small output capacitor placed between the
output pins and ground can have a beneficial
effect. A 0.1µF ceramic capacitor is suggested as
a reasonable value for an output capacitor. Please
refer to Figure 4.
4296.2006.12.1.3
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
The output capacitor has no specific capacitor type
or ESR requirement. If desired, COUT may be
increased to a value greater than 0.1µF without
limit to accommodate any load transient condition
without adversely affecting the device turn-on slew
rate time.
Constants for the AAT4296 and AAT4298 are maximum junction temperature, TJ(MAX) = 125°C, and
package thermal resistance, θJA = 120°C/W. Worstcase conditions are calculated at the maximum
operating temperature, where TA = 85°C. Typical
conditions are calculated under normal ambient
conditions, where TA = 25°C.
Thermal Considerations
At 25°C ambient, the AAT4296 is capable of dissipating 440mW of power. If all five channels have
5.0V output, the average current is 121mA per
channel. The AAT4298 is capable of dissipating
625mW of power. If all six channels have 5.0V output, the average current is 131.5mA per channel.
The AAT4296 and AAT4298 are designed to deliver continuous output load currents. The limiting
characteristic for maximum safe operating output
load current is package power dissipation. In order
to obtain high operating currents, careful device
layout and circuit operating conditions need to be
taken into account.
At any given ambient temperature (TA), the maximum package power dissipation can be determined by the following equation:
PD(MAX) =
At 85°C ambient, the AAT4296 is capable of dissipating 177.78mW of power. If all five channels
have 5.0V output, the average current is 76.5mA
per channel. The AAT4298 is capable of dissipating 250mW of power. If all six channels have 5.0V
output, the average current is 83mA per channel.
TJ(MAX) - TA
θJA
Applications Circuit
VCC Input
VCC
OUT1
OUT 1
OUT2
OUT 2
AAT4298
EN/SET Input
EN/SET
OUT3
OUT 3
OUT4
OUT 4
OUT5
OUT 5
OUT6
OUT 6
GND
C1*
C2*
C3*
C4*
C5*
C6*
Figure 4: Typical Application Diagram.
*Use of capacitors on each output is optional.
4296.2006.12.1.3
13
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
Driving LED Loads
RLED =
The AAT4296 and AAT4298 can be used to drive
LEDs or other applications with light load current
requirements. LED applications may include main
and sub-LCD display backlighting, camera photoflash applications, color (RGB) LEDs, and infrared
(IR) diodes for remotes. In series with LEDs, ballast resistors must be used to limit the LED current.
The LED current will vary with supply voltage and
LED forward voltage. Most types of LEDs have forward voltage specifications ranging from 2.0V to
5.0V. Calculate the necessary ballast resistor value
from the following formula:
(VIN - VF)
- RDS(ON)
ILED
Where:
RLED is the resistance of resistor to be placed in
series with the LED (Ω).
VIN is the input supply voltage to the device (V).
VF is the forward voltage of the LED (V).
RDS(ON) is the resistance of the switch when it is
turned on (Ω).
ILED is the desired operating current of the LED (A).
5V
AAT4296
EN Bluetooth
Device
OUT1
IN
OUT2
EN
OUT3
OUT4
A series of
pulses
EN/SET
Infrared
Device
OUT5
Backlighting
OUT6
GND
R
G
B
Figure 5: Infrared, Bluetooth, RGB, and Backlighting Control.
14
4296.2006.12.1.3
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
AAT4296
Low Dropout
Voltage
Regulator
IN
OUT1
OUT2
VIN
Circuit 1
30mA
VIN
Circuit 2
30mA
VIN
Circuit 3
30mA
VIN
Circuit 4
30mA
VIN
Circuit 5
30mA
OUT3
OUT4
GPIO 1
EN/SET OUT5
System
µController
GPIO 2
GPIO 3
GPIO 4
GPIO 5
GPIO 2
to
GPIO 5
are now free for
other uses
Figure 6: GPIO I/O Expander (Condense Five GPIO Control Lines to One Using AAT4296).
4296.2006.12.1.3
15
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
SC70JW-8
SC70JW-10
TSOPJW-12
QIXYY
AAT4296IJS-T1
AAT4298IJQ-T1
AAT4298ITP-T1
QEXYY
All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means
semiconductor products that are in compliance with current RoHS standards, including
the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more
information, please visit our website at http://www.analogictech.com/pbfree.
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.
16
4296.2006.12.1.3
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
SC70JW-10
2.20 ± 0.20
1.75 ± 0.10
0.40 BSC
0.225 ± 0.075
Top View
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
2.00 ± 0.20
2.10 ± 0.30
Side View
End View
All dimensions in millimeters.
4296.2006.12.1.3
17
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
TSOPJW-12
2.85 ± 0.20
+ 0.10
- 0.05
2.40 ± 0.10
0.20
0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC
7° NOM
0.04 REF
0.055 ± 0.045
0.15 ± 0.05
+ 0.10
1.00 - 0.065
0.9625 ± 0.0375
3.00 ± 0.10
4° ± 4°
0.45 ± 0.15
0.010
2.75 ± 0.25
All dimensions in millimeters.
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
18
4296.2006.12.1.3
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