1

Characteristics subject to change without notice

2088 1.1 04/10/05

SMS48

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

Four Independent Programmable Reset Outputs

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

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 Supervisory Controller With Independent

Resets

FEATURES

INTRODUCTION

The SMS48 is a highly programmable voltage supply

controller and supervisory circuit designed specifically for

advanced systems that need to monitor multiple voltages.

The SMS48 can monitor four separate voltages without the

need of any external voltage divider circuitry. This allevi-

ates the need for factory-trimmed threshold voltages and

the use of external components to accommodate different

supply voltages and tolerances.

The SMS48 has four programmable independant reset

outputs to control different devices for varying reset condi-

tions such as UV, OV, watchdog and user pushbutton

applications.

The SMS48 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

interface.

Programming of configuration, control and calibration val-

ues by the user is simplified with the SMX3200 interface

adapter and Windows GUI software obtainable from Sum-

mit Microelectronics.

SIMPLIFIED APPLICATION DRAWING

Figure 1 - Precision Quad Power Supply Monitor can monitor any voltage over the range of 0.6V to 5.6V.

One of the four supplies must be above 2.7V to power the SMS48.

V0

V1

V2

V3

RESET#0

RESET#3

VDD_CAP

RESET#1

RESET#2

3.3V

2.5V

1.8V

1.2V

SMS48

A2

A1 SDA SCL

7

6

9

10

1

16

2

3

14

MR#

Monitored

Supplies

15

WLDI

GND

8

13

12

11

5

4

0.1µF

Vpullup (0 to +12V)

uP/DSP

ASIC/FPGA

Logic

LCD

From uP

RESET#