Six-Channel Power Supply Supervisor and Cacsade Sequence Controller - Summit Microelectronics - (Version JPG) - PDF Catalogue | Technical Documentation

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Programmable controller, Potentiometer, Power supply controller, Power management controller, Reset circuit

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SUMMIT

MICROELECTRONICS, Inc.

SMS66

Preliminary Information (See Last Page)

Six-Channel Power Supply Supervisor and Cacsade Sequence Controller

FEATURES & APPLICATIONS

INTRODUCTION

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

• I²C 2-wire serial bus for programming 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

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 I²C bus.

Using the I²C interface, a host system can communicate with the SMS66 status register, optionally control Power-on/off, and utilize 4 K-bits of nonvolatile memory.

SIMPLIFIED APPLICATIONS DRAWING

12VIN (+8V to +15V Range) Q-VDD (+2.7V to +5.5V Range)

► 12V >• 3.3V


12VIN	VDD
SDA
SCL
A2		^PUPA
AIN1	SMS66	^VMA
VREF_OUT
VREF_ADC >-		PUP_F
MR	HEALTH RST

I²C BUS

External

or Internal TEMP

SENSOR

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.

2071 1.1 4/27/06

Six-Channel Power Supply Supervisor and Cacsade Sequence Controller - Summit Microelectronics - #1

Programmable controller, Potentiometer, Power supply controller, Power management controller, Reset circuit