SUMMIT
MICROELECTRONICS, Inc.
Highly Programmble Voltage Supervisory Circuit
SMS44
NOTE: THIS PRODUCT HAS REACHED END OF LIFE
FEATURES
!
Operational from any of four Voltage Monitoring
Inputs
!
Programmability allows monitoring any voltage
between 0.9V and 6.0V with NO external
components
!
Programmable Watchdog Timer
!
Programmable Longdog™ Timer
!
Programmable Reset Pulse Width
!
Programmable Power-up sequencing
!
Programmable Nonvolatile Combinatorial Logic
for generation of reset and interrupt outputs
!
Fault Status Register
INTRODUCTION
The SMS44 is a highly programmable voltage supervisory
circuit designed specifically for advanced systems need-
ing to monitor multiple voltages. The SMS44 can monitor
four separate voltages without the need of any external
voltage divider circuitry
The SMS44 watchdog timer has a user programmable
timeout period and it can be placed in an idle mode for
system initialization or system debug. All of the functions
are user accessible through an industry standard 2-wire
serial interface.
FUNCTIONAL BLOCK DIAGRAM
CONFIGURATION
REGISTER
11
RESET#
MR#
1
V0
16
NV DAC
REF
+
–
RESET
IRQ
PROGRAMMABLE
RESET PULSE
GENERATOR
4
PUP#1
5
V1
2
NV DAC
REF
+
–
IRQ
RESET
PROGRAMMABLE
LONGDOG
TIMER
PROGRAMMABLE
POWER
SEQUENCING
PUP#2
13
PUP#3
V2
3
NV DAC
REF
RESET
PROGRAMMABLE
WATCHDOG
TIMER
+
–
SERIAL
BUS
CONTROL
LOGIC
9
SDA
10
SCL
7
A2
6
A1
IRQ
V3
14
NV DAC
REF
+
–
RESET
IRQ
12
IRQ#
15
WLDI
CONFIGURATION
REGISTER
8
4K-BIT NV
MEMORY
GND
2047 BD 1.0
©SUMMIT MICROELECTRONICS, Inc., 2000 • 300 Orchard City Dr., Suite 131 • Campbell, CA 95008 • Phone 408-378-6461 • FAX 408-378-6586 • www.summitmicro.com
Characteristics subject to change without notice
2047 2.3 10/23/00
EOL 12/16/05
1
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
