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ADM1075
TABLE OF CONTENTS
Features .............................................................................................. 1 ?
Applications ....................................................................................... 1 ?
Product Highlights ........................................................................... 1 ?
Functional Block Diagram .............................................................. 1 ?
Revision History ............................................................................... 3 ?
General Description ......................................................................... 4 ?
Specifications..................................................................................... 5 ?
Serial Bus Timing ......................................................................... 9 ?
Absolute Maximum Ratings.......................................................... 10 ?
Thermal Resistance .................................................................... 10 ?
ESD Caution ................................................................................ 10 ?
Pin Configuration and Function Description ............................ 11 ?
Typical Performance Characteristics ........................................... 13 ?
Theory of Operation ...................................................................... 20 ?
Powering the ADM1075 ............................................................ 20 ?
Current Sense Inputs.................................................................. 21 ?
Current Limit Reference ............................................................ 21 ?
Setting the Current Limit (ISET) ............................................. 22 ?
Soft Start ...................................................................................... 22 ?
Constant Power Foldback (PLIM) ........................................... 22 ?
TIMER ......................................................................................... 23 ?
Setting a Linear Output Voltage Ramp at Power-Up ............. 24 ?
Hot Swap Fault Retry ................................................................. 25 ?
Fast Response to Severe Overcurrent ...................................... 25 ?
UV and OV ................................................................................. 25 ?
PWRGD ....................................................................................... 25 ?
DRAIN ......................................................................................... 26 ?
SPLYGD ....................................................................................... 26 ?
LATCH......................................................................................... 26 ?
SHDN ........................................................................................... 26 ?
RESTART ..................................................................................... 26 ?
FET Health .................................................................................. 26 ?
Power Monitor ............................................................................ 26 ?
Isolation ....................................................................................... 27 ?
PMBus Interface ............................................................................. 28 ?
Device Addressing ...................................................................... 28 ?
SMBus Protocol Usage ............................................................... 28 ?
Packet Error Checking ............................................................... 28 ?
Partial Transactions on I 2 C Bus ................................................ 28 ?
SMBus Message Formats ........................................................... 29 ?
Data Sheet
Group Commands ..................................................................... 30 ?
Hot Swap Control Commands ................................................. 31 ?
ADM1075 Information Commands ........................................ 31 ?
Status Commands ...................................................................... 31 ?
GPO and Alert Pin Setup Commands .................................... 32 ?
Power Monitor Commands ...................................................... 32 ?
Warning Limit Setup Commands ............................................ 33 ?
PMBus Direct Format Conversion .......................................... 34 ?
Voltage and Current Conversion Using LSB Values .............. 35 ?
ADM1075 Alert Pin Behavior ...................................................... 36 ?
Faults and Warnings .................................................................. 36 ?
Generating an Alert ................................................................... 36 ?
Handling/Clearing an Alert ...................................................... 36 ?
SMBus Alert Response Address ............................................... 37 ?
Example Use of SMBus Alert Response Address ................... 37 ?
Digital Comparator Mode ......................................................... 37 ?
PMBus Command Reference........................................................ 38 ?
Register Details ............................................................................... 39 ?
Operation Command Register ................................................. 39 ?
Clear Faults Register .................................................................. 39 ?
PMBus Capability Register ....................................................... 39 ?
IOUT OC Warn Limit Register ................................................ 39 ?
VIN OV Warn Limit Register ................................................... 39 ?
VIN UV Warn Limit Register ................................................... 39 ?
PIN OP Warn Limit Register .................................................... 40 ?
Status Byte Register .................................................................... 40 ?
Status Word Register .................................................................. 40 ?
IOUT Status Register ................................................................. 41 ?
Input Status Register .................................................................. 41 ?
Manufacturing Specific Status Register ................................... 42 ?
Read EIN Register ...................................................................... 43 ?
Read VIN Register...................................................................... 43 ?
Read IOUT Register ................................................................... 43 ?
Read PIN Register ...................................................................... 43 ?
PMBus Revision Register .......................................................... 43 ?
Manufacturing ID Register ....................................................... 44 ?
Manufacturing Model Register ................................................ 44 ?
Manufacturing Revision Register............................................. 44 ?
Peak IOUT Register ................................................................... 44 ?
Peak VIN Register ...................................................................... 45 ?
Rev. C | Page 2 of 52
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