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AAT3520IGY-308-200-T1 Schematic ( PDF Datasheet ) - Advanced Analogic Technologies

Teilenummer AAT3520IGY-308-200-T1
Beschreibung MicroPower Microprocessor Reset Circuit
Hersteller Advanced Analogic Technologies
Logo Advanced Analogic Technologies Logo 




Gesamt 8 Seiten
AAT3520IGY-308-200-T1 Datasheet, Funktion
AAT3520/2/4
MicroPower Microprocessor Reset Circuit
General Description
The AAT3520 Series of PowerManager™ products
is a member of AATI's Total Power Management
IC™ (TPMIC™) product family. These micro-
processor reset circuits are ideal for monitoring volt-
age supplies in portable systems, where extended
battery life is critical. They provide a low cost, reli-
able solution by eliminating external components.
The AAT3520 series operates by monitoring the
system power supply voltage. When the input volt-
age drops below a fixed threshold, the device
asserts a reset signal for a fixed time period after
VCC has risen back above the fixed threshold; 30ms
and 150ms minimum periods are available. The
AAT3520 product series is guaranteed to operate
down to 1.2V and designed to ignore fast line tran-
sients appearing on VCC. The AAT3520 series is
available with three output stage versions: AAT3520
push-pull active high output, AAT3522 push-pull
active low output and AAT3524 open drain active
low output. The quiescent supply current is
extremely low, typically 1µA, making it ideal for
portable battery operated equipment.
The AAT3520/2/4 are available in a 3 pin SOT23
package and are specified over -40° to 85°C oper-
ating temperature range.
Features
PowerManager
• 1.2V to 5.5V Input voltage range
• Operation down to 1.2V
• Extremely low quiescent current: less than 2µA
• High accuracy detection threshold: ±1.5%
• Monitor Power Supply Voltages
• Fixed thresholds from 2.2V to 4.6V
• Reset pulse width options
• Minimum 30 ms or 150ms
• Fast propagation delay <20µs
• Available output configurations:
• Open-drain output
• CMOS active high output
• CMOS active low output
• Temp range -40 to 85°C
• 3 pin SOT23 package
Applications
• Notebook Computers
• Cell Phones
• Portable Electronics
• Embedded Systems
• Intelligent Instruments
Typical Application
VCC
VCC
AAT3520
AAT3522 RESET
AAT3524 (RESET)
GND
*
100k
(nominal)
VCC
RESET
INPUT
uP
GND
3520.2002.2.0.9
*AAT3524 Only
1






AAT3520IGY-308-200-T1 Datasheet, Funktion
AAT3520/2/4
MicroPower Microprocessor Reset Circuit
Applications Information
Reset Output Options
The AAT3524 has an active low open drain output
and the AAT3520/2 have a push-pull output. The
AAT3524 may be used in multiple voltage systems,
with an external pull-up resistor. This allows the
AAT3524 to interface to microprocessors with high-
er supply voltages up to 5.5V (Figure 2). In the
event of a power down or brown-out condition the
reset signal remains valid until the VCC drops below
1.2V. To ensure validity down to ground an external
100kresistor should be connected between the
RESET output and GND.
Supply Voltage Transient Behavior
In some cases fast negative transients of short dura-
tion can appear on the VCC power supply. The
AAT3520 series devices provide some immunity to
line transients which can generate invalid reset puls-
es. Figure 1 shows typical behavior to short duration
pulses verses RESET comparator overdrive. As
shown in the Maximum Transient Duration vs. Reset
Threshold Overdrive graph, when the transient volt-
age becomes larger, the time allowed before assert-
ing a reset becomes shorter. e.g. typically a transient
of 100mV below the reset threshold would have to
present for more than 50µs to cause a reset.
Immunity can be increased by the addition of a small
by-pass capacitor of 0.1µF connected as close to
the VCC pin as possible.
+3.3V
+5.0V
VCC
AAT3524 RESET
GND
100k
VCC
RESET 5V
INPUT System
GND
Figure 2: Using AAT3524 Open Drain Output with Multiple Supplies
6 3520.2002.2.0.9

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