AAT3532 Advanced Analogic Technologies, Inc., AAT3532 Datasheet - Page 5

• Manufacturer Part Number: AAT3532
• Description: Aat3532 | Micropower Supervisory Circuit With Delay, Manual Reset, And Watchdog
• Manufacturer: Advanced Analogic Technologies, Inc.

Applications Information
Power Monitor
The reset function monitors the V
a microprocessor is correctly reset and is powered
up into a known condition following a power supply
failure. RST and RST will remain valid for V
ages down to 1.4V.
The RST and RST pins are asserted whenever V
drops below the reset threshold voltage. This volt-
Functional Block Diagram
3532.2005.12.1.2
RESET Output Delay (V
PBRST
0V
VCC
TOL
ST
TD
V
CC
CC
Rising)
RST
RST
CC
supply to ensure
Tolerance
t
Select
RPU
Figure 1: Reset Output Delay.
V
De-Bounce
CC
Circuit
MicroPower™ Microprocessor Reset Circuit
CC
+4.50V (10% Trip Point)
+4.75V (5% Trip Point)
volt-
CC
V
+5V
REF
Watchdog
Detector
Timer
GND
age can be set by programming the TOL pin.
Connecting TOL to V
the V
Connecting TOL to GND sets the 5% tolerance of
the V
reset pin is guaranteed to remain asserted for a
minimum period of 250ms after V
above the reset threshold voltage. (See Figure 1.)
RST output is an open drain output. For correct
operation, a pull-up resistor of 10kΩ should be con-
nected between this output and V
CC
Watchdog
CC
Timer
t
RPD
supply (typically 4.62V for V
Generator
supply (typically 4.37V for V
Reset
RESET Output Delay (V
CC
RST
RST
sets the 10% tolerance of
CC
Falling)
AAT3532
CC
.
CC
CC
= 5V). The
CC
has risen
= 5V).
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