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ASM1232LPSN-2 Datasheet(PDF) 1 Page - PulseCore Semiconductor

Part # ASM1232LPSN-2
Description  5V 關P Power Supply Monitor and Reset Circuit
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Manufacturer  PULSECORE [PulseCore Semiconductor]
Direct Link  http://www.onsemi.com/
Logo PULSECORE - PulseCore Semiconductor

ASM1232LPSN-2 Datasheet(HTML) 1 Page - PulseCore Semiconductor

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Notice: The information in this document is subject to change without notice
rev 1.6
5V µP Power Supply Monitor and Reset Circuit
November 2006
ASM1232LP/LPS
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200, Campbell, CA 95008
• Tel: 408-879-9077 • Fax: 408-879-9018
www.pulsecoresemi.com
General Description
The ASM1232LP/LPS is a fully integrated microprocessor
supervisor. It can halt and restart a “hung-up” microprocessor,
restart a microprocessor after a power failure. It has a
watchdog timer and external reset override.
A
precision
temperature-compensated
reference
and
comparator circuits monitor the 5V, VCC input voltage status.
During power-up or when the VCC power supply falls outside
selectable tolerance limits, both RESET and RESET become
active. When VCC rises above the threshold voltage, the reset
signals remain active for an additional 250ms minimum,
allowing the power supply and system microprocessor to
stabilize. The trip point tolerance signal, TOL, selects the trip
level tolerance to be either 5% or 10%.
Each device has both a push-pull, active HIGH reset output and
an open drain active LOW reset output. A debounced manual
reset input, PBRST, activates the reset outputs for a minimum
period of 250ms.
There is a watchdog timer to stop and restart a microprocessor
that is “hung-up”. The watchdog timeouts periods are
selectable: 150ms, 610ms and 1200ms. If the ST input is not
strobed LOW before the time-out period expires, a reset is
generated.
Devices are available in 8-pin DIP, 16-pin SO and compact 8-
pin MicroSO packages.
Key Features
5V supply monitor
Selectable watchdog period
Debounce manual push-button reset input
Precision temperature-compensated voltage reference and
comparator.
Power-up, power-down and brown out detection
250ms minimum reset time
Active LOW open drain reset output and active HIGH
push-pull output
Selectable trip point tolerance: 5% or 10%
Low-cost surface mount packages: 8-pin/16-pin SO, 8-pin
DIP and 8-pin Micro SO packages
Wide operating temperature -40°C to +85°C (N suffixed
devices)
Applications
Microprocessor Systems
Computers
Controllers
Portable Equipment
Intelligent Instuments
Automotive Systems
Typical Operating Circuit
Block Diagram
ASM1232LP/LPS
ST
RESET
GND
TD
TOL
I/O
RESET
µP
10k
+5V
Tolerance Selection
Reference
Push Button
Voltage Sense
Watchdog Transition
Reset &
Debounce
Comparators
Detector
Watchdog Timer
+
-
RESET
RESET
PBRST
ST
TD
TOL
VCC
GND
40k
VCC
ASM1232LP/LPS


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