Datenblatt-pdf.com


AAT4296 Schematic ( PDF Datasheet ) - AAT

Teilenummer AAT4296
Beschreibung (AAT4296 / AAT4298) Five/Six Channel Push/Pull I/O Expander
Hersteller AAT
Logo AAT Logo 




Gesamt 18 Seiten
AAT4296 Datasheet, Funktion
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
General Description
Features
SmartSwitch
The AAT4296/98 SmartSwitch is a member of
AnalogicTech's Application Specific Power MOS-
• VIN Range: 1.8V to 5.5V
• Independent Push/Pull Channels
FET™ (ASPM™) product family. The AAT4296/98
— AAT4296: Five Channels
is comprised of five/six push/pull output switches
— AAT4298: Six Channels
that gate each respective output between a common
• User-Programmable Interface
input supply and ground. This device is targeted for
• Single GPIO Controls State of Each Output
I/O expansion applications, but can also be used for
• Optional Fast Auto-Discharge
a combination of general purposes to simplify power
• Low Quiescent Current: 3µA Typical
switching with an off state load discharge.
• Temperature Range: -40°C to +85°C
The AAT4296/98 operates over an input voltage
range of 1.8V to 5.5V, making it ideal for battery-
powered applications. The state of each output
channel is controlled with a single GPIO via the
• Available in Pb-Free Packages:
— AAT4296: 8-Pin SC70JW
— AAT4298: 10-Pin SC70JW and
12-Pin TSOPJW
EN/SET pin using AnalogicTech's Simple Serial
Control™ (S2Cwire™) interface. When EN/SET is
pulled to logic high, the device is enabled and con-
sumes 3µA of typical quiescent current. In the off
Applications
state, each output is pulled low to ground to affect
a logic low state for I/O expander or power switch-
ing applications; this circuit will act as a load dis-
charge function to rapidly turn off a load circuit.
www.DataSheet4U.com
Rated over the -40°C to +85°C temperature range,
Cell Phones
Multiple Low Power Switching
Personal Communication Devices
Portable Electronic Devices
the AAT4296 is offered in a Pb-free 8-pin SC70JW
package, and the AAT4298 is offered in both a Pb-
free 10-pin SC70JW and a Pb-free 12-pin
TSOPJW package.
Typical Application
VCC Input
EN/SET Input
VCC
OUT1
OUT2
AAT4298
OUT3
OUT4
OUT5
EN/SET
GND
OUT6
OUT 1
OUT 2
OUT 3
OUT 4
OUT 5
OUT 6
4296.2006.12.1.3
1






AAT4296 Datasheet, Funktion
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
(ILOAD = 100mA)
4.0
3.5
RDS6 RDS3
RDS4
3.0
2.5
2.0
1.5 RDS5
RDS2 RDS1
1.0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
N-Channel RDS(ON) vs. Temperature
(ILOAD = 100mA)
2.9
2.6
2.3
RDS6
RDS3
RDS4
2.0
1.7
1.4 RDS1
1.1
RDS5
RDS2
0.8
-40
-20
0 20 40 60
Temperature (°C)
80 100
P-Channel RDS(ON) vs. Temperature
(VCC = 3.6V; ILOAD = 100mA)
4.0
3.7 RDS5
3.4 RDS6
RDS3
3.1
RDS4
RDS1
2.8
RDS2
2.5
2.2
-40
-20
0 20 40 60
Temperature (°C)
80 100
EN/SET Latch Timeout vs. Temperature
350
300
250
200
150
100
50
-40
-20
VCC = 5.0V
VCC = 3.3V
VCC = 1.8V
0 20 40 60
Temperature (°C)
80 100
6
N-Channel RDS(ON) vs. Temperature
(VCC = 3.6V; ILOAD = 100mA)
3.5
3.0 RDS4
2.5
RDS6
RDS3
2.0
1.5
1.0
RDS5
RDS2
RDS1
0.5
0.0
-40
-20
0 20 40 60
Temperature (°C)
80 100
EN/SET Off Timeout vs. Temperature
350
300
250
200
150
100
50
-40
-20
VCC = 5.0V
VCC = 3.3V
VCC = 1.8V
0 20 40 60
Temperature (°C)
80 100
4296.2006.12.1.3

6 Page









AAT4296 pdf, datenblatt
AAT4296/98
Five/Six Channel Push/Pull I/O Expander
The S2Cwire interface relies on the number of ris-
ing 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 control-
ling 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
EN/SET
TH TL
TLAT
TON
Figure 3: Timing Diagram.
TO TOFF
Applications Information
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 capaci-
tors, or pull-up or pull-down resistors.
For applications which may use some or all of the
output to switch light load current levels to applica-
tion circuits, good engineering practice would dic-
tate 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 recommend-
ed 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
CIN should be located as close to the device VIN pin
as practically possible.
There is no specific capacitor equivalent series
resistance (ESR) requirement for CIN; however, for
higher current operation, ceramic capacitors are rec-
ommended 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.
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 prod-
ucts do not require an output capacitor because
the end load is not sensitive to device turn-on tran-
sient effects.
For improved load transient response in systems
using the AAT4296/98 for load switching, the addi-
tion 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

12 Page





SeitenGesamt 18 Seiten
PDF Download[ AAT4296 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
AAT4290(AAT4290 / AAT4291) I/O Expander Load SwitchesAAT
AAT
AAT4291(AAT4290 / AAT4291) I/O Expander Load SwitchesAAT
AAT
AAT4295(AAT4295 / AAT4297) Single/Dual RGB ControllerAAT
AAT
AAT4296(AAT4296 / AAT4298) Five/Six Channel Push/Pull I/O ExpanderAAT
AAT
AAT4297(AAT4295 / AAT4297) Single/Dual RGB ControllerAAT
AAT

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche