SMS64

Preliminary

Characteristics Subject to Change Without Notice

2060 2.22 10/09/03

1

FEATURES & APPLICATIONS

• Monitors and Controls up to 6 Power

Supplies

• Programmable Sequencing for both Power-

on and Power-off

• Programmable Threshold Sensors

• Programmable Reset and Interrupt Functions

• Programmable Watchdog/Longdog Timer

• Fault and Status Registers

• 4k-Bit Nonvolatile Memory

Applications

• Monitor and Control Distributed Power and

Point of Use Power Supplies

• Telecom

• Compact PCI

• Servers

• Multi-voltage Network Processors, DSPs,

ASICs

INTRODUCTION

The SMS64 is a highly integrated power supply

monitor and controller. The SMS64 has six supply

managers, each individually programmable with

regard to threshold voltages, actions that can be taken

with either an under- or over-voltage condition and

how that manager will operate in sequencing the

power-on operation.

The managers can act independently or sequenced

with any other manager in the device.

When the

managers work together the device can control the

sequence in which power is applied to the application

circuits. Each manager is assigned to a sequence

position which allows the device to perform power

supply sequencing in any order.

For power-off

situations the SMS64 can sequence the supplies

either in the same order or reverse order from the

power-on sequence.

The SMS64 has two programmable Watchdog

timers, two programmable reset outputs and a

programmable IRQ# output.

Using the I

serial interface, a host system can communicate with

the SMS64 status register, optionally control power-on

via software and utilize 4 K-bits of nonvolatile memory.

Six-Channel Supply Monitor and Sequencing Controller

GND

V+

OUT

SET

ON/OFF

GND

V+

OUT

ON/OFF

GND

V+

OUT

SET

SHDN

3.3V

2.7V

PUP

D

ASIC

DSP

2.5V

1.8V

2.0V

1.5V

RST_A#

VCC_CAP

Pow er-On

IRQ#

HEALTHY#

GND

MR#

RESET#

SMS64

GND

V+

OUT

ON/OFF

PW R_ON/OFF

2.7V

2.7V

UP

Power Supply Sequencing and System Start-up Initialization using the SMS64

This is an example application and the specific component values are purposely not shown. The SMS64 can be used with any combination of

MOSFETs, LDOs or DC/DC converters to optimize sequencing and minimize losses in the power chain.

SIMPLIFIED APPLICATIONS DRAWING