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SMS11

FOUR-CHANNEL VOLTAGE MONITOR AND SEQUENCER

Preliminary Information

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FEATURES & APPLICATIONS INTRODUCTION

Digital Programming Of All Major Parameters Via Programming Interface And Non-Volatile Memory

The SMS11 is an integrated voltage monitor and sequencer. It is capable of monitoring four channels and sequencing three channels with minimal external components. Two multiplexed pins SENSE/RESET# and SENSE1/VDD allow the SMS11 to provide multi- channel sequencing and monitoring in a compact 8-pin SOIC or an 8-ball CSP package. The SMS11 provides three enable outputs that sequence each channel on after the supply in the previous sequence position reaches its programmable threshold. Each enable output has a programmable active high/low logic level, and a programmable channel-to-channel delay. A reset output is asserted once all supplies have been sequenced on and the monitored voltages are above the programmed threshold. The reset output has a assertion delay that allows it to be asserted after one of four programmable delays. The monitoring function on the SMS11 allows the user to choose from 16 voltage threshold settings allowing a wide range of voltages to be sequenced. In addition, the SMS11 can be programmed to disable all supplies if an under voltage condition is present on any monitored supply. A Graphical user interface and an evaluation board are available to expedite the design process.

Programmable Settings Include
o Sequence Order o Sequencing Delay o Enable Polarity o Reset Timeout Period o UV Monitoring Threshold UV Fault Response Monitors Up To 4 Supplies Sequences Up To 3 Supplies 2.7V To 5.5V Input Range Under Voltage Lockout (UVLO) Graphical User Interface (GUI) To Facilitate Modification Of Programmable Settings Reset Output Multiplexed With Sense Input Monitored Input Supply Minimal External Circuitry Required 8-Ball Highly-Compact 1.4mm X 2.5mm Ultra CSP
TM (Chip-Scale) Package 8 Lead SOIC Package Low Power Dissipation

Applications

Graphics Cards Notebook & Laptop Computers Printers & other Office Equipment Telecom/Datacom Routers/Switches Digital TVs & Set-top Boxes FPGA, CPU, ASIC Monitoring/Sequencing

SIMPLIFIED APPLICATION DRAWING

DC/DCConverter 1Enable DC/DCConverter 2Enable DC/DCConverter 3Enable DC/DCConverter 4Enable Sense 1VDDEnable 2OutputSense 2Sense 3Sense 4 Input/Reset# OutputEnable 3OutputEnable 4OutputGround Feed 1Feed 2Feed 3Feed 4 Channel 2 OutputChannel 3 OutputChannel 4 Output Channel 1 Output

SMS11

Figure 1 – The SMS11 monitors four voltages and sequences three DC/DC converters.

© SUMMIT Microelectronics, Inc. 2006 • 757 North Mary Avenue • Sunnyvale CA 94085 • Phone 408 523-1000 • FAX 408 523-1266

http://www.summitmicro.com/

2093 1.5 1/3/2007

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