ADM1075
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
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
Peak VAUX Register .................................................................. 45
Power Monitor Control Register.............................................. 45
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 Characteristic............................................. 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
Hot Swap Fault Retry ................................................................. 24
Fast Response to Severe Overcurrent ...................................... 24
UV and OV ................................................................................. 24
PWRGD
....................................................................................... 25
DRAIN......................................................................................... 25
SPLYGD
....................................................................................... 25
......................................................................................... 25
........................................................................................... 25
LATCH
SHDN
RESTART
..................................................................................... 25
FET Health .................................................................................. 26
Power Monitor............................................................................ 26
Isolation ....................................................................................... 26
PMBus Interface ............................................................................. 28
Device Addressing...................................................................... 28
SMBus Protocol Usage............................................................... 28
Packet Error Checking............................................................... 28
SMBus Message Formats........................................................... 29
Group Commands...................................................................... 30
Hot Swap Control Commands ................................................. 31
Rev. A | Page 2 of 52
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