Datasheet

MAX34451 PMBus 16-Channel V/I Monitor and
12-Channel Sequencer/Marginer
www.maximintegrated.com
Maxim Integrated │ 16
Note 1: Commoncommandsareshaded;accessthroughanypageresultsinthesamedeviceresponse.
Note 2: In the Flash Stored/Lockedcolumn,the“N”ontheleftindicatesthatthisparameterisnotstoredinflashmemorywhen
theSTORE_DEFAULT_ALLorMFR_STORE_ALLcommandisexecuted;thevalueshownintheDefault Value column is
automatically loaded upon power-on reset or when the RSTpinisasserted.The“Y”ontheleftintheFlash Stored/Locked
columnindicatesthatthecurrentlyloadedvalueinthisparameterisstoredinflashmemorywhentheSTORE_DEFAULT_
ALLorMFR_STORE_ALLcommandisexecutedandisautomaticallyloadeduponpower-onresetorwhentheRSTpinis
asserted;thevalueshownintheDefault Valuecolumnisthevaluewhenshippedfromthefactory.“FIXED”intheFlash
Stored column means that the value is fixed at the factory and cannot be changed. The value shown in the Default Value
column is automatically loaded upon power-on reset or when the RSTpinisasserted.Theright-sideY/Nindicatesthat
whenthedeviceislocked,onlythecommandslistedwith“N”canbeaccessed.Allothercommandsareignoredifwritten
andreturnFFhifread.OnlythePAGE,CLEAR_FAULTS,OPERATION,andMFR_SERIALcommandscanbewrittento.
Thedeviceunlocksiftheupper4bytesofMFR_SERIALmatchthedatawrittentothedevice.
Note 3: The factory-set value is dependent on the device hardware and firmware revision.
Note 4: Thefactory-setdefaultvalueforthis8-byteblockis3130313031303130h.
Note 5: Thefactory-setdefaultvalueforthis4-byteblockis00000000h.
Note 6: Thefactory-setdefaultvalueforthecompleteblockoftheMFR_NV_FAULT_LOGisFFh.
Note 7: MFR_PWM_CONFIGisonlyavailableforPAGES0–7.
PMBus/SMBus Address Select
Ondevicepower-up,thedevicesamplestheADDRpin
todeterminethePMBus/SMBusserial-portaddress.The
combinationofthecomponentsshowninFigure1deter-
minestheserial-portaddress(alsoseeTable4).
SMBus/PMBus Operation
The device implements the PMBus command structure
usingtheSMBusformat.Thestructureof thedataflow
between the host and the slave is shown below for
several different types of transactions. All transactions
begin with a host sending a command code that is
immediatelyprecededwitha7-bitslaveaddress(R/W =
0).DataissentMSBfirst.
Figure 1. PMBus/SMBus Address Select
Table 3. PMBus Command Codes (continued)
CODE COMMAND NAME TYPE
PAGE
NO. OF
BYTES
FLASH
STORED/
LOCKED
(NOTE 2)
DEFAULT
VALUE
(NOTE 2)
0–11 12–15 16–20 255
(NOTE 1)
E8h MFR_SEQ_CONFIG
BlockR/W R/W — — — 4 Y/Y (Note5)
EEh MFR_STORE_ALL Writebyte W W W W 1 N/Y —
EFh MFR_RESTORE_ALL
Writebyte W W W W 1 N/Y —
F0h MFR_TEMP_SENSOR_CONFIG
R/Wword — — R/W — 2 Y/Y 0000h
FCh MFR_STORE_SINGLE
R/Wword R/W R/W R/W R/W 2 N/Y 0000h
FEh MFR_CRC
R/Wword R/W R/W R/W R/W 2 N/Y FFFFh
MSDA
MSCL
MAX34451
ADDR
R1
R2
C2
R3 R4