1

Characteristics subject to change without notice

2047 2.3 10/23/00 EOL 12/16/05

SMS44

SUMMIT

MICROELECTRONICS, Inc.

©SUMMIT MICROELECTRONICS, Inc., 2000 • 300 Orchard City Dr., Suite 131 • Campbell, CA 95008 • Phone 408-378-6461 • FAX 408-378-6586 • www.summitmicro.com

NOTE: THIS PRODUCT HAS REACHED END OF LIFE

!

!

!

!

!

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

Highly Programmble Voltage Supervisory Circuit

FUNCTIONAL BLOCK DIAGRAM

FEATURES

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.

2047 BD 1.0

+

–

REF

NV DAC

+

–

REF

NV DAC

+

–

REF

NV DAC

+

–

REF

NV DAC

RESET

IRQ

RESET

IRQ

RESET

IRQ

PROGRAMMABLE

WATCHDOG

TIMER

PROGRAMMABLE

LONGDOG

TIMER

PROGRAMMABLE

RESET PULSE

GENERATOR

SERIAL

BUS

CONTROL

LOGIC

4K-BIT NV

MEMORY

RESET#

PUP#1

11

5

4

SDA

IRQ#

WLDI

9

15

10

PUP#2

PUP#3

13

SCL

A2

7

6

A1

CONFIGURATION

REGISTER

CONFIGURATION

REGISTER

GND

8

RESET

IRQ

12

PROGRAMMABLE

POWER

SEQUENCING