
REV. B
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
ADM1232
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 1997
Mcroprocessor
Supervisory Circuit
FUNCT IONAL BLOCK DIAGRAM
GND
PB RESET
TOLERANCE
TD
RESET
ADM1232
RESET
GENERATOR
RESET
DEBOUNCE
WATCHDOG
TIMEBASE
SELECT
WATCHDOG
TIMER
V
CC
5%/10%
TOLERANCE
SELECT
VREF
FEATURES
Superior Upgrade for MAX1232 and Dallas DS1232
Low Power Consumption (500
m
A max)
Adjustable Precision Voltage Monitor with +4.5 V and
+4.75 V Options
Adjustable STROBE Monitor with 150 ms, 600 ms or
1.2 sec Options
No External Components
APPLICATIONS
Microprocessor Systems
Portable Equipment
Computers
Controllers
Intelligent Instruments
Automotive Systems
Protection Against Damage Caused by
m
P Failure
GE NE RAL DE SCRIPT ION
T he ADM1232 is a superior, pin-compatible upgrade for the
MAX 1232 and the DS1232L P and DS1232. T he Analog
Devices ADM1232 is a microprocessor monitoring circuit that
can monitor:
1. Microprocessor Supply Voltage.
2. Whether a Microprocessor has locked-up.
3. An External Interrupt.
T he ADM1232 is available in four different packages:
1. T he ADM1232ARM in an 8-lead microSOIC (RM-8).
2. T he ADM1232AN in an 8-lead PDIP (N-8).
3. T he ADM1232ARW in a 16-lead wide SOIC (R-16).
4. T he ADM1232ARN is an 8-lead narrow SOIC (R-8).
ADM1232
STROBE
TOLERANCE
STROBE
GND
TD
ADM1232
RESET
MICROPROCESSOR
I/O
+5V
10k
V
+5V
Figure 1. Typical Supply Monitoring Application