PMBUS规格书1.2II

【实例截图】

【核心代码】

PMBus Power System Mgt Protocol Specification – Part II – Revision 1.2
© 2010 System Management Interface Forum, Inc. Page 3 of 106
All Rights Reserved
Table Of Contents
1. Introduction ............................................................................................................................................ 9
1.1. Specification Scope ........................................................................................................................ 9
1.1.1. Specification Structure ............................................................................................................ 9
1.1.2. What Is Included ...................................................................................................................... 9
1.1.3. What Is Not Included In the PMBus Specification ................................................................... 9
1.2. Specification Changes Since The Last Revision ............................................................................ 9
1.3. Where To Send Feedback And Comments .................................................................................... 9
2. Related Documents ............................................................................................................................... 9
2.1. Scope .............................................................................................................................................. 9
2.2. Applicable Documents .................................................................................................................... 9
2.3. Reference Documents .................................................................................................................. 10
3. Reference Information ......................................................................................................................... 10
3.1. Signal and Parameter Names ...................................................................................................... 10
3.2. Numerical Formats ....................................................................................................................... 10
3.2.1. Decimal Numbers .................................................................................................................. 10
3.2.2. Binary Numbers ..................................................................................................................... 10
3.2.3. Hexadecimal Numbers .......................................................................................................... 10
3.2.4. Examples ............................................................................................................................... 10
3.3. Bit And Byte Order ........................................................................................................................ 11
3.4. Bit And Byte Illustrations ............................................................................................................... 11
3.5. Abbreviations, Acronyms And Definitions..................................................................................... 13
4. Addressing And Grouping .................................................................................................................... 15
4.1. Device Addresses ......................................................................................................................... 15
4.2. General Call Address (Global Broadcast) .................................................................................... 15
4.3. Sending Commands To A Group ................................................................................................. 16
5. Commands ........................................................................................................................................... 16
5.1. Commands And Command Codes ............................................................................................... 16
5.2. Command Extensions................................................................................................................... 16
5.3. Command Execution .................................................................................................................... 16
5.4. Writing And Reading PMBus Devices .......................................................................................... 16
5.4.1. All Packets Start With A Write Address ................................................................................. 16
5.4.2. Every Parameter That Can Be Written Must Be Readable ................................................... 16
5.4.3. Commands May Be Read Only ............................................................................................. 17
6. Memory Model, Startup Behavior And Defaults .................................................................................. 17
6.1. Order Of Memory Loading And Precedence ................................................................................ 17
6.2. The Default And User Stores ........................................................................................................ 19
7. Data Formats ....................................................................................................................................... 20
7.1. Linear Data Format ....................................................................................................................... 20
7.2. DIRECT Data Format ................................................................................................................... 21
7.2.1. Interpreting Received Values ................................................................................................ 21
7.2.2. Sending A Value .................................................................................................................... 21
7.2.3. Obtaining The Value Of The m, b, And R Coefficients.......................................................... 22
7.3. Accuracy ....................................................................................................................................... 22
7.4. Resolution ..................................................................................................................................... 22
8. Data Formats For The Output Voltage And Output Voltage Related Parameters .............................. 22
8.1. Two Step Process ......................................................................................................................... 23
8.2. VOUT_MODE Command ............................................................................................................. 23
8.3. Data Bytes For Output Voltage Related Commands .................................................................... 24
8.3.1. Linear Mode ........................................................................................................................... 24
8.3.2. VID Format ............................................................................................................................ 25
8.3.3. DIRECT Format ..................................................................................................................... 26
9. Setting And Monitoring The Output Voltage And Current.................................................................... 27
9.1. VOUT_SCALE_LOOP And VOUT_SCALE_MONITOR .............................................................. 27
9.2. Setting The Output Voltage .......................................................................................................... 29
PMBus Power System Mgt Protocol Specification – Part II – Revision 1.2
© 2010 System Management Interface Forum, Inc. Page 4 of 106
All Rights Reserved
9.3. Making And Calibrating Output Current Measurements ............................................................... 30
9.4. Deleted ......................................................................................................................................... 31
10. Fault Management And Reporting ................................................................................................... 31
10.1. Monitoring Operation ................................................................................................................ 31
10.2. General Description Of PMBus Device Fault Management ..................................................... 33
10.2.1. Warning Conditions ........................................................................................................... 33
10.2.2. Fault Conditions ................................................................................................................. 33
10.2.3. Clearing Warning Or Fault Bits .......................................................................................... 33
10.2.4. Clearing Individual Bits ...................................................................................................... 34
10.2.5. Clearing Bits In The STATUS_BYTE And STATUS_WORD ............................................ 34
10.2.5.1. General Rules ................................................................................................................ 34
10.2.5.2. Special Case: NONE OF THE ABOVE .......................................................................... 35
10.2.5.3. Exceptions ...................................................................................................................... 35
10.2.6. Immediate Reassertion After Clearing If Condition Is Still Present ................................... 35
10.3. Conceptual View Of How Status Bits And SMBALERT# Work ................................................ 35
10.4. Setting Fault And Warning Thresholds ..................................................................................... 36
10.5. Setting The Response To A Detected Fault Condition ............................................................. 36
10.5.1. Response To Voltage, Temperature And TON_MAX Faults ............................................. 37
10.5.2. Response To Current Faults .............................................................................................. 38
10.6. Reporting Faults And Warnings To The Host ........................................................................... 40
10.6.1. SMBALERT# Signal And Process ..................................................................................... 40
10.6.2. Direct PMBus Device To Host Communication ................................................................. 41
10.7. Clearing A Shutdown Due To A Fault ....................................................................................... 41
10.8. Data Transmission Faults ......................................................................................................... 41
10.8.1. Corrupted Data .................................................................................................................. 42
10.8.2. Sending Too Few Bits ........................................................................................................ 42
10.8.3. Reading Too Few Bits ....................................................................................................... 42
10.8.4. Host Sends Or Reads Too Few Bytes ............................................................................... 42
10.8.5. Host Sends Too Many Bytes ............................................................................................. 43
10.8.6. Reading Too Many Bytes .................................................................................................. 43
10.8.7. Device Busy ....................................................................................................................... 43
10.9. Data Content Faults .................................................................................................................. 44
10.9.1. Improperly Set Read Bit In The Address Byte ................................................................... 44
10.9.2. Unsupported Command Code ........................................................................................... 44
10.9.3. Invalid Or Unsupported Data ............................................................................................. 44
10.9.4. Data Out Of Range Fault ................................................................................................... 45
10.9.5. Reserved Bits..................................................................................................................... 45
11. Address, Memory, Communication And Capability Related Commands ......................................... 46
11.1. WRITE_PROTECT ................................................................................................................... 46
11.2. STORE_DEFAULT_ALL ........................................................................................................... 46
11.3. RESTORE_DEFAULT_ALL ...................................................................................................... 46
11.4. STORE_DEFAULT_CODE ....................................................................................................... 47
11.5. RESTORE_DEFAULT_CODE .................................................................................................. 47
11.6. STORE_USER_ALL ................................................................................................................. 47
11.7. RESTORE_USER_ALL ............................................................................................................ 48
11.8. STORE_USER_CODE ............................................................................................................. 48
11.9. RESTORE_USER_CODE ........................................................................................................ 48
11.10. PAGE ........................................................................................................................................ 49
11.11. PHASE ...................................................................................................................................... 50
11.12. CAPABILITY ............................................................................................................................. 51
11.13. QUERY ..................................................................................................................................... 51
11.14. PAGE_PLUS_WRITE ............................................................................................................... 52
11.15. PAGE_PLUS_READ ................................................................................................................. 53
12. On, Off And Margin Testing Related Commands ............................................................................ 53
12.1. OPERATION ............................................................................................................................. 53
12.2. ON_OFF_CONFIG.................................................................................................................... 54
PMBus Power System Mgt Protocol Specification – Part II – Revision 1.2
© 2010 System Management Interface Forum, Inc. Page 5 of 106
All Rights Reserved
13. Output Voltage Related Commands ................................................................................................ 55
13.1. VOUT_MODE ........................................................................................................................... 55
13.2. VOUT_COMMAND ................................................................................................................... 55
13.3. VOUT_TRIM ............................................................................................................................. 56
13.4. VOUT_CAL_OFFSET ............................................................................................................... 56
13.5. VOUT_MAX .............................................................................................................................. 56
13.6. VOUT_MARGIN_HIGH ............................................................................................................. 57
13.7. VOUT_MARGIN_LOW ............................................................................................................. 57
13.8. VOUT_TRANSITION_RATE ..................................................................................................... 57
13.9. VOUT_DROOP ......................................................................................................................... 57
13.10. VOUT_SCALE_LOOP .............................................................................................................. 57
13.11. VOUT_SCALE_MONITOR ....................................................................................................... 58
14. Other Commands ............................................................................................................................. 58
14.1. COEFFICIENTS ........................................................................................................................ 58
14.2. POUT_MAX .............................................................................................................................. 59
14.3. MAX_DUTY ............................................................................................................................... 59
14.4. FREQUENCY_SWITCH ........................................................................................................... 59
14.5. VIN_ON ..................................................................................................................................... 59
14.6. VIN_OFF ................................................................................................................................... 60
14.7. INTERLEAVE ............................................................................................................................ 60
14.8. IOUT_CAL_GAIN ...................................................................................................................... 61
14.9. IOUT_CAL_OFFSET ................................................................................................................ 61
14.10. FAN_CONFIG_1_2 ................................................................................................................... 61
14.11. FAN_CONFIG_3_4 ................................................................................................................... 62
14.12. FAN_COMMAND_n .................................................................................................................. 63
15. Fault Related Commands ................................................................................................................ 64
15.1. CLEAR_FAULTS ...................................................................................................................... 64
15.2. VOUT_OV_FAULT_LIMIT ........................................................................................................ 64
15.3. VOUT_OV_FAULT_RESPONSE ............................................................................................. 64
15.4. VOUT_OV_WARN_LIMIT ......................................................................................................... 64
15.5. VOUT_UV_WARN_LIMIT ......................................................................................................... 65
15.6. VOUT_UV_FAULT_LIMIT ........................................................................................................ 65
15.7. VOUT_UV_FAULT_RESPONSE .............................................................................................. 65
15.8. IOUT_OC_FAULT_LIMIT ......................................................................................................... 66
15.9. IOUT_OC_FAULT_RESPONSE ............................................................................................... 66
15.10. IOUT_OC_LV_FAULT_LIMIT ................................................................................................... 66
15.11. IOUT_OC_LV_FAULT_RESPONSE ........................................................................................ 66
15.12. IOUT_OC_WARN_LIMIT .......................................................................................................... 67
15.13. IOUT_UC_FAULT_LIMIT .......................................................................................................... 67
15.14. IOUT_UC_FAULT_RESPONSE ............................................................................................... 67
15.15. DELETED .................................................................................................................................. 68
15.16. DELETED .................................................................................................................................. 68
15.17. OT_FAULT_LIMIT..................................................................................................................... 68
15.18. OT_FAULT_RESPONSE .......................................................................................................... 68
15.19. OT_WARN_LIMIT ..................................................................................................................... 68
15.20. UT_WARN_LIMIT ..................................................................................................................... 69
15.21. UT_FAULT_LIMIT ..................................................................................................................... 69
15.22. UT_FAULT_RESPONSE .......................................................................................................... 69
15.23. VIN_OV_FAULT_LIMIT ............................................................................................................ 69
15.24. VIN_OV_FAULT_RESPONSE ................................................................................................. 70
15.25. VIN_OV_WARN_LIMIT ............................................................................................................. 70
15.26. VIN_UV_WARN_LIMIT ............................................................................................................. 70
15.27. VIN_UV_FAULT_LIMIT ............................................................................................................ 71
15.28. VIN_UV_FAULT_RESPONSE .................................................................................................. 71
15.29. IIN_OC_FAULT_LIMIT ............................................................................................................. 71
15.30. IIN_OC_FAULT_RESPONSE ................................................................................................... 71
PMBus Power System Mgt Protocol Specification – Part II – Revision 1.2
© 2010 System Management Interface Forum, Inc. Page 6 of 106
All Rights Reserved
15.31. IIN_OC_WARN_LIMIT .............................................................................................................. 72
15.32. POWER_GOOD Signal Limits .................................................................................................. 72
15.32.1. POWER_GOOD_ON ......................................................................................................... 72
15.32.2. POWER_GOOD_OFF ....................................................................................................... 72
15.33. POUT_OP_FAULT_LIMIT ........................................................................................................ 72
15.34. POUT_OP_FAULT_RESPONSE ............................................................................................. 73
15.35. POUT_OP_WARN_LIMIT ......................................................................................................... 73
15.36. PIN_OP_WARN_LIMIT ............................................................................................................. 73
15.37. Other Fault And Warning Responses ....................................................................................... 73
15.38. SMBALERT_MASK Command ................................................................................................. 74
16. Output Voltage Sequencing Commands .......................................................................................... 74
16.1. TON_DELAY ............................................................................................................................. 74
16.2. TON_RISE ................................................................................................................................ 74
16.3. TON_MAX_FAULT_LIMIT ........................................................................................................ 75
16.4. TON_MAX_FAULT_RESPONSE ............................................................................................. 75
16.5. TOFF_DELAY ........................................................................................................................... 75
16.6. TOFF_FALL .............................................................................................................................. 75
16.7. TOFF_MAX_WARN_LIMIT ....................................................................................................... 76
17. Unit Status Commands .................................................................................................................... 77
17.1. STATUS_BYTE......................................................................................................................... 77
17.2. STATUS_WORD....................................................................................................................... 78
17.3. STATUS_VOUT ........................................................................................................................ 79
17.4. STATUS_IOUT ......................................................................................................................... 80
17.5. STATUS_INPUT ....................................................................................................................... 80
17.6. STATUS_TEMPERATURE ....................................................................................................... 80
17.7. STATUS_CML (Communications, Logic, And Memory) ........................................................... 81
17.8. STATUS_OTHER ..................................................................................................................... 81
17.9. STATUS_MFR_SPECIFIC ....................................................................................................... 82
17.10. STATUS_FANS_1_2 ................................................................................................................ 82
17.11. STATUS_FANS_3_4 ................................................................................................................ 83
18. Reading Parametric Information ...................................................................................................... 84
18.1. READ_VIN ................................................................................................................................ 84
18.2. READ_IIN .................................................................................................................................. 84
18.3. READ_VCAP ............................................................................................................................ 84
18.4. READ_VOUT ............................................................................................................................ 85
18.5. READ_IOUT .............................................................................................................................. 85
18.6. READ_TEMPERATURE_n ....................................................................................................... 85
18.7. READ_FAN_SPEED_n ............................................................................................................. 85
18.8. Deleted ...................................................................................................................................... 86
18.9. READ_DUTY_CYCLE .............................................................................................................. 86
18.10. READ_FREQUENCY ............................................................................................................... 86
18.11. READ_POUT ............................................................................................................................ 86
18.12. READ_PIN ................................................................................................................................ 86
18.13. READ_EIN And READ_EOUT .................................................................................................. 86
19. Reserved .......................................................................................................................................... 88
20. Reserved .......................................................................................................................................... 88
21. Reserved .......................................................................................................................................... 88
22. Manufacturer’s Information .............................................................................................................. 88
22.1. PMBUS_REVISION .................................................................................................................. 88
22.2. Inventory Information ................................................................................................................ 89
22.2.1. MFR_ID .............................................................................................................................. 89
22.2.2. MFR_MODEL .................................................................................................................... 89
22.2.3. MFR_REVISION ................................................................................................................ 89
22.2.4. MFR_LOCATION ............................................................................................................... 89
22.2.5. MFR_DATE ........................................................................................................................ 89
22.2.6. MFR_SERIAL .................................................................................................................... 90
PMBus Power System Mgt Protocol Specification – Part II – Revision 1.2
© 2010 System Management Interface Forum, Inc. Page 7 of 106
All Rights Reserved
22.2.7. IC_DEVICE_ID .................................................................................................................. 90
22.2.8. IC_DEVICE_REV .............................................................................................................. 90
22.3. Manufacturer Ratings ................................................................................................................ 90
22.3.1. MFR_VIN_MIN................................................................................................................... 90
22.3.2. MFR_VIN_MAX ................................................................................................................. 90
22.3.3. MFR_IIN_MAX ................................................................................................................... 90
22.3.4. MFR_PIN_MAX ................................................................................................................. 90
22.3.5. MFR_VOUT_MIN............................................................................................................... 90
22.3.6. MFR_VOUT_MAX ............................................................................................................. 91
22.3.7. MFR_IOUT_MAX ............................................................................................................... 91
22.3.8. MFR_POUT_MAX ............................................................................................................. 91
22.3.9. MFR_TAMBIENT_MAX ..................................................................................................... 91
22.3.10. MFR_TAMBIENT_MIN ...................................................................................................... 91
22.3.11. MFR_EFFICIENCY_LL ...................................................................................................... 91
22.3.12. MFR_EFFICIENCY_HL ..................................................................................................... 92
22.3.13. MFR_PIN_ACCURACY ..................................................................................................... 93
22.3.14. APP_PROFILE_SUPPORT ............................................................................................... 93
22.3.15. MFR_MAX_TEMP_1, _2, _3 ............................................................................................. 94
23. User Data And Configuration ........................................................................................................... 94
24. Manufacturer Specific Commands ................................................................................................... 94
25. Command Extensions ...................................................................................................................... 95
25.1. MFR_SPECIFIC_COMMAND_EXT.......................................................................................... 95
25.2. PMBUS_COMMAND_EXT ....................................................................................................... 95
APPENDIX I. Command Summary ............................................................................................................. 96
APPENDIX II. Summary Of Changes ....................................................................................................... 105
Table Of Figures
Figure 1. Bit Order Within A Byte ................................................................................................................ 11
Figure 2. Conceptual View Of Possible PMBus Device Memory And Communication .............................. 18
Figure 3. Flowchart Of Conceptual Loading Operating Memory At Startup ............................................... 19
Figure 4. Linear Data Format Data Bytes ................................................................................................... 21
Figure 5. VOUT_MODE Command Data Byte Structure ............................................................................ 24
Figure 6. Linear Format Data Bytes ............................................................................................................ 25
Figure 7. VID Format Data Bytes ................................................................................................................ 25
Figure 8. DIRECT Format Mode Data Bytes .............................................................................................. 27
Figure 9. Output Voltage Sensing In A Typical Power Converter ............................................................... 28
Figure 10. Conceptual View Of The Application Of The VOUT_SCALE_LOOP Command ...................... 28
Figure 11. Conceptual View Of How Output Voltage Related Commands Are Applied ............................. 30
Figure 12. Generating READ_IOUT Concept ............................................................................................. 31
Figure 13. Status Register Map .................................................................................................................. 32
Figure 14. Conceptual View Of Creating Bits In STATUS_BYTE And STATUS_WORD .......................... 34
Figure 15. Conceptual Schematic Of Status Bits And SMBALERT# .......................................................... 36
Figure 16. Interaction Of SMBALERT# And Status Registers .................................................................... 41
Figure 17. Packet Structure For PMBus Device To Notify Host ................................................................. 41
Figure 18. Conceptual View Of Paging Used For A Multiple Output PMBus Device ................................. 49
Figure 19. Conceptual View Of Using Paging With A PMBus To Non-PMBus Device Adapter ................. 50
Figure 20. PAGE_PLUS Command Example With Written Data And PEC ............................................... 52
Figure 21. PAGE_PLUS Command Example With Data To Read And PEC ............................................. 53
Figure 22. Retrieving Coefficients Using PEC ............................................................................................ 59
Figure 23. Illustration Of The INTERLEAVE Command Function .............................................................. 61
Figure 24. SMBALERT_MASK Command Packet Format ......................................................................... 74
Figure 25. Retrieving The SMBALERT_MASK Setting For A Given Status Register ................................ 74
Figure 26. Summary Of The Status Registers ............................................................................................ 77
Figure 27. READ_EIN Command Packet Format ....................................................................................... 87
PMBus Power System Mgt Protocol Specification – Part II – Revision 1.2
© 2010 System Management Interface Forum, Inc. Page 8 of 106
All Rights Reserved
Figure 28. READ_EOUT Command Packet Format ................................................................................... 88
Figure 29. APP_PROFILE_SUPPORT Packet Example ............................................................................ 94
Table Of Tables
Table 1. Bit And Byte Symbols Used In This Specification ......................................................................... 11
Table 2. Summary Of The VOUT_MODE Data Byte Format ..................................................................... 24
Table 3. VID Types Supported By PMBus .................................................................................................. 26
Table 4. Voltage, Temperature And TON_MAX Faults Response Data Byte Details ................................ 37
Table 5. Current Fault Response Data Byte Details ................................................................................... 39
Table 6. WRITE_PROTECT Command Data Byte ..................................................................................... 46
Table 7. CAPABILITY COMMAND Data Byte Format ................................................................................ 51
Table 8. QUERY Command Returned Data Byte Format .......................................................................... 52
Table 9. OPERATION Data Byte Contents ................................................................................................. 54
Table 10. ON_OFF_CONFIG Data Byte ..................................................................................................... 55
Table 11. INTERLEAVE Data Bytes Format ............................................................................................... 60
Table 12. FAN_CONFIG_1_2 Data Byte Format........................................................................................ 62
Table 13. FAN_CONFIG_3_4 Data Byte Format........................................................................................ 63
Table 14. STATUS_BYTE Message Contents ........................................................................................... 78
Table 15. STATUS_WORD Message Contents ......................................................................................... 78
Table 16. STATUS_VOUT Data Byte ......................................................................................................... 79
Table 17. STATUS_IOUT Data Byte .......................................................................................................... 80
Table 18. STATUS_INPUT Data Byte ........................................................................................................ 80
Table 19. STATUS_TEMPERATURE Data Byte ........................................................................................ 81
Table 20. STATUS_CML Data Byte ........................................................................................................... 81
Table 21. STATUS_OTHER Data Byte ...................................................................................................... 82
Table 22. STATUS_MFR_SPECIFIC Data Byte......................................................................................... 82
Table 23. STATUS_FANS_1_2 Data Byte ................................................................................................. 83
Table 24. STATUS_FANS_3_4 Data Byte ................................................................................................. 83
Table 25. PMBus Revision Data Byte Contents ......................................................................................... 88
Table 26. Data Format Of The MFR_EFFICIENCY_LL Command ............................................................ 91
Table 27. Data Format Of The MFR_EFFICIENCY_HL Command ........................................................... 92
Table 28. APP_PROFILE_SUPPORT First Data Byte Contents................................................................ 93
Table 29. Command Summary ................................................................................................................... 96