ADM1276-3ACPZ-RL(Rev0) Просмотр технического описания (PDF) - Analog Devices

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ADM1276-3ACPZ-RL
(Rev.:Rev0)

Hot Swap Controller and Digital Power and Energy Monitoring with PMBus Interface

Analog Devices 

ADM1276

TABLE OF CONTENTS

Features .............................................................................................. 1

Power Monitor Commands ...................................................... 28

Applications....................................................................................... 1

Warning Limit Setup Commands ............................................ 29

Functional Block Diagram .............................................................. 1

PMBus Direct Format Conversion .......................................... 30

General Description ......................................................................... 1

Voltage and Current Conversion Using LSB Values.............. 32

Revision History ............................................................................... 3

GPO2/ALERT2 Pin Behavior ....................................................... 33

Specifications..................................................................................... 4

Serial Bus Timing Characteristics .............................................. 7

Absolute Maximum Ratings............................................................ 8

Thermal Characteristics .............................................................. 8

Faults and Warnings .................................................................. 33

Generating an Alert ................................................................... 33

Handling/Clearing an Alert ...................................................... 33

SMBus Alert Response Address ............................................... 33

ESD Caution.................................................................................. 8

Pin Configuration and Function Descriptions............................. 9

Typical Performance Characteristics ........................................... 11

Typical Application Circuit ........................................................... 17

Theory of Operation ...................................................................... 18

Powering the ADM1276............................................................ 18

Current Sense Inputs.................................................................. 18

Current-Limit Reference ........................................................... 19

Setting the Current Limit (ISET) ............................................. 19

Soft Start ...................................................................................... 20

Foldback....................................................................................... 20

Timer............................................................................................ 21

Hot Swap Retry Duty Cycle ...................................................... 21

FET Gate Drive Clamps............................................................. 21

Fast Response to Severe Overcurrent ...................................... 22

Undervoltage and Overvoltage................................................. 22

ENABLE Input ............................................................................ 22

Power Good................................................................................. 22

VOUT Measurement ................................................................. 23

FET Health .................................................................................. 23

Power Monitor ............................................................................ 23

PMBus Interface ............................................................................. 24

Device Addressing...................................................................... 24

SMBus Protocol Usage............................................................... 24

Packet Error Checking............................................................... 24

SMBus Message Formats ........................................................... 25

Group Commands...................................................................... 26

Hot Swap Control Commands ................................................. 27

ADM1276 Information Commands ........................................ 27

Status Commands....................................................................... 27

GPO and Alert Pin Setup Commands..................................... 28

Example Use of SMBus Alert Response Address ................... 34

PMBus Command Reference........................................................ 35

OPERATION .............................................................................. 36

CLEAR_FAULTS........................................................................ 36

CAPABILITY.............................................................................. 36

VOUT_OV_WARN_LIMIT..................................................... 36

VOUT_UV_WARN_LIMIT..................................................... 36

IOUT_OC_WARN_LIMIT ...................................................... 36

IOUT_WARN2_LIMIT............................................................. 36

VIN_OV_WARN_LIMIT ......................................................... 37

VIN_UV_WARN_LIMIT ......................................................... 37

PIN_OP_WARN_LIMIT .......................................................... 37

STATUS_BYTE .......................................................................... 37

STATUS_WORD........................................................................ 38

STATUS_VOUT ......................................................................... 38

STATUS_IOUT .......................................................................... 38

STATUS_INPUT........................................................................ 39

STATUS_MFR_SPECIFIC........................................................ 39

READ_EIN.................................................................................. 40

READ_VIN ................................................................................. 40

READ_VOUT............................................................................. 40

READ_IOUT .............................................................................. 40

READ_PIN.................................................................................. 40

PMBUS_REVISION .................................................................. 40

MFR_ID....................................................................................... 41

MFR_MODEL ............................................................................ 41

MFR_REVISION........................................................................ 41

PEAK_IOUT............................................................................... 41

PEAK_VIN.................................................................................. 41

PEAK_VOUT ............................................................................. 42

PMON_CONTROL ................................................................... 42

Rev. 0 | Page 2 of 48

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