SMS66

Preliminary Information

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www.summitmicro.com

2070 1.0 7/16/03

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Six-Channel Power Supply Supervisor and Cacsade Sequence Controller

FEATURES & APPLICATIONS

• Very accurate monitor function – 5mV steps

• Monitors and sequences up to six supplies

• Programmable Power-on/-off sequencing

• Monitors internal temperature sensor

• Operates from 12V or 3.3V supply

• Monitors 12V input and VDD

• Monitors two general-purpose 10-bit ADC inputs

• Programmable threshold limits (2 OV/2 UV) for

each monitored input

• Programmable RESET, HEALTHY and FAULT

functions

• 4k-bit general purpose nonvolatile memory

configuration and monitoring status, including

10-bit ADC conversion results

Applications

• Monitor and Sequence Distributed Power and

Point of Load Power Supplies

• Multi-voltage Processors, DSPs, ASICs used in

Telecom, CompactPCI or server systems

INTRODUCTION

The SMS66 is a very accurate programmable power

supply supervisor that monitors and sequences. It

controls sequencing time and position of up to six

isolated or non-isolated distributed or POL DC/DC

converters. The monitor supervisory function has two

independent UV and OV settings for each supply and

can be set in 5mV steps. The SMS66 also sequences

the power supplies in any order using enable outputs

with programmable polarity.

The SMS66 monitors six power supply channels as

well as VDD, 12V input, two general-purpose analog

inputs and an internal temperature sensor using a 10-

bit ADC. The 10-bit ADC can measure the value on

any one of the input channels and output the

conversion data via the I

Using the I

communicate with the SMS66 status register,

optionally control Power-on/off, and utilize 4 K-bits of

nonvolatile memory.

SIMPLIFIED APPLICATIONS DRAWING

PUP

F

VM

F

PUP

A

VM

A

SMS66

µP/

DSP/

NPU/

FPGA

VDD (+2.7V to +5.5V Range)

RESET

DONE

HEALTHY

12VIN (+8V to +15V Range)

External

or

Internal

TEMP

SENSOR

AIN1

VREF_ADC

2.5VIN

1.2VIN

12V

SDA

SCL

BUS

3.3V

A2

VREF_OUT

VIN

Vout

DC/DC

Converter A

ON/OFF

VIN

Vout

DC/DC

Converter F

ON/OFF

External or

Internal

REFERENCE

Figure 1 – Applications Schematic using the SMS66 Controller to cascade sequence up to six DC/DC

Converters while also providing supervisory functions.

Note: This is an applications example only. Some pins, components and values are not shown.