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AAT3532
MicroPower™ Microprocessor Reset Circuit
3532.2005.12.1.2 1
PowerManager
™
General Description
The AAT3532 PowerManager is a member of
AnalogicTech’s Total Power Management IC™
(TPMIC™) product family. It is a fully integrated
device for monitoring microprocessor activity,
external reset, and power supply conditions. The
device holds the microprocessor in a reset condi-
tion for a minimum of 250ms while V
CC
is estab-
lished to ensure correct system start-up. A manual
reset can be initiated via a de-bounced input pin.
As an additional level of protection, the AAT3532
includes a watchdog timer which requires a period-
ic strobe input from the microprocessor to ensure
correct operation. The AAT3532 has a programma-
ble watchdog timer and voltage tolerance level.
The quiescent supply current is extremely low, typ-
ically 23µA.
The AAT3532 is available in a Pb-free, 8-pin SOP
package and is specified over the -40°C to +85°C
temperature range.
Features
• Adjustable 4.5V or 4.75V Voltage Monitor
• 250ms (min) Reset Pulse Width
• Low Quiescent Current: Typically 23µA
• Adjustable Watchdog Timer (150ms, 600ms,
or 1200ms)
• De-bounced Manual Reset Input
• Operates Down to 20ns Strobe Input Pulse
Width
• No External Components
• Temperature Range: -40° to +85°C
• Standard 8-Pin SOP Package
• Pin Compatible with MAX1232
Applications
• Automotive
• Computers
• Controllers
• Embedded Systems
• Intelligent Instrumentation
• Telecom Equipment
Typical Application
AAT3532
µP
VCC
RST
GND
RST
RESET
INPUT
V
DD
V
DD
I/OST
PBRST
TD
TOL
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