EVAL-ADM1275EBZ Datasheet, PDF (2/48 Pages) Analog Devices – Hot-Swap Controller and Digital Power

ADM1275
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
SMBus Message Formats ........................................................... 28
Applications....................................................................................... 1
Group Commands ..................................................................... 29
Applications Diagram ...................................................................... 1
Hot-Swap Control Commands................................................. 30
General Description ......................................................................... 1
ADM1275 Information Commands ........................................ 30
Revision History ............................................................................... 3
Status Commands ...................................................................... 30
Specifications..................................................................................... 4
GPO and Alert Pin Setup Commands .................................... 31
Serial Bus Timing Characteristics .............................................. 7
Power Monitor Commands ...................................................... 31
Absolute Maximum Ratings............................................................ 8
Warning Limit Setup Commands ............................................ 32
Thermal Characteristics .............................................................. 8
PMBus Direct Format Conversion .......................................... 32
ESD Caution.................................................................................. 8
Voltage and Current Conversion using LSB values ............... 33
Pin Configurations and Function Descriptions ........................... 9
ADM1275 Alert Pin Behavior ...................................................... 34
Typical Performance Characteristics ........................................... 14
Faults and Warnings .................................................................. 34
Functional Block Diagrams........................................................... 20
Generating an Alert ................................................................... 34
Theory of Operation ...................................................................... 21
Handling/Clearing an Alert ...................................................... 34
Powering the ADM1275 ............................................................ 21
SMBus Alert Response Address ............................................... 35
Current Sense Inputs.................................................................. 21
Example Use of SMBus Alert Response Address ................... 35
Current Limit Reference............................................................ 22
PMBus Command Reference........................................................ 36
Setting the Current Limit (ISET) ............................................. 22
OPERATION .............................................................................. 37
Soft Start ...................................................................................... 23
CLEAR_FAULTS ........................................................................ 37
Foldback....................................................................................... 23
CAPABILITY.............................................................................. 37
Timer............................................................................................ 24
VOUT_OV_WARN_LIMIT..................................................... 37
Hot-Swap Retry Duty Cycle...................................................... 24
VOUT_UV_WARN_LIMIT..................................................... 37
FET Gate Drive Clamps............................................................. 24
IOUT_OC_WARN_LIMIT ...................................................... 37
Fast Response to Severe Overcurrent ...................................... 25
IOUT_WARN2_LIMIT............................................................. 38
Undervoltage and Overvoltage................................................. 25
VIN_OV_WARN_LIMIT ......................................................... 38
ENABLE Input (ADM1275-3 Only) ........................................ 25
VIN_UV_WARN_LIMIT ......................................................... 38
Power Good................................................................................. 25
STATUS_BYTE .......................................................................... 38
VOUT Measurement ................................................................. 26
STATUS_WORD........................................................................ 39
FET Health .................................................................................. 26
STATUS_VOUT ......................................................................... 39
Power Monitor ............................................................................ 26
STATUS_IOUT .......................................................................... 39
PMBus Interface ............................................................................. 27
STATUS_INPUT ........................................................................ 40
Device Addressing...................................................................... 27
STATUS_MFR_SPECIFIC........................................................ 40
SMBus Protocol Usage............................................................... 27
READ_VIN ................................................................................. 40
Packet Error Checking ............................................................... 27
READ_VOUT............................................................................. 41
Partial Transactions on I²C Bus ................................................ 27
READ_IOUT .............................................................................. 41
PMBUS_REVISION .................................................................. 41
Rev. D | Page 2 of 48