1

Characteristics subject to change without notice

2087 1.1 04/11/05

SMS47

SUMMIT

MICROELECTRONICS, Inc.

©SUMMIT MICROELECTRONICS, Inc., 2005

• 1717 Fox Dr. • San Jose, CA 95131 • Phone 408-436-9890 • FAX 408-436-9897 •

www.summitmicro.com

Operational from any of four Voltage Monitoring

Inputs

Programmable Power-up Cascade Sequencing

Programmability allows monitoring any voltage

between 0.6V and 5.6V with no external

components

Programmable 5mV steps in the low range

Programmable Watchdog Timer

Programmable Reset Pulse Width

Programmable Nonvolatile Combinatorial Logic

for generation of Reset

Fault Status Register

APPLICATIONS

Desktop/Notebook/TabletComputers

Multi-voltage Systems

Telecom/Network Servers

Portable Battery-powered Equipment

Set-top Boxes

Data-storage Equipment

Quad Programmable Precision Cascade Sequencer and Supervisory

Controller

FEATURES

INTRODUCTION

The SMS47 is a nonvolatile user-programmable voltage

supply cascade sequencer and supervisory circuit de-

signed specifically for advanced systems that need to

monitor multiple voltages. The SMS47 can monitor four

separate voltages without the need of any external voltage

divider circuitry unlike other devices that need factory-

trimmed threshold voltages and external components to

accommodate different supply voltages and tolerances.

The SMS47 can also be used to enable DC/DC converters

or LDOs to provide a closed loop cascading of the supplies

duringpower-up.

The SMS47 watchdog timer has a user programmable

time-out period and it can be placed in an idle mode for

system initialization or system debug. All of the functions

serial interface.

Programming of configuration, control and calibration

values by the user is simplified with the SMX3200 program-

ming adapter and Windows GUI software obtainable from

Summit Microelectronics.

SIMPLIFIED APPLICATION DRAWING

Applications Schematic using the SMS47 Controller to provide closed loop power-up cascade sequenc-

ing and supervisory functions.

NOTE: THIS IS AN APPLICATIONS EXAMPLE ONLY. SOME PINS, COMPONENTS AND VALUES ARE NOT SHOWN.

2047 SAD 2.0

V0

V1

V2

V3

RESET#

PUP#1

VDD_CAP

PUP#2

PUP#3

5V

3.3V

2.5V

1.8V

DC/DC

DC/DC

LDO

SMS47

A2 A1 SDA SCL

7

6

9

10

1

16

2

3

14

MR#

Reset#

15

WLDI

GND

8

11

12

4

13

5

0.1µF