Datasheet

MAX34451 PMBus 16-Channel V/I Monitor and
12-Channel Sequencer/Marginer
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Table 38. MFR_SEQ_CONFIG (E8h)
MFR_MARGIN_CONFIG (DFh)
The MFR_MARGIN_CONFIG command configures
boththedigital PWMnoutputs(PWM0–PWM7)and the
externalDS4424currentDAC(ifpresent)tomarginthe
associated power supplies. If the PWMn/GPOn pin is
configured with MFR_PWM_CONFIG for any function
besides PWM operation, this selection overrides the
margining functionality. The MFR_MARGIN_CONFIG
command is described in Table 39.
Power-Supply Margining Operation
For the power supplies connected to PSEN0–PSEN7
(PAGES 0–7), power-supply margining is implemented
usingthePWM0–PWM7outputs,respectively.ThePWM
frequencyis312.5kHz.Forpowersuppliesconnectedto
PSEN8–PSEN11(PAGES8–11),power-supplymargining
isimplementedusingtheexternalDS4424DACoutputs
according Table 40. The device close-loop controls the
PWM duty cycle orDAC output current setting to mar-
ginthepowersupply.Whenmarginingisnotactive,the
PWMnandDACoutputsarehighimpedance.
BIT NAME MEANING
31:16 PG_GPI_SELECT
ThesebitsareonlyusedifSELECT[1:0]=01;eachbitcorrespondstoonechannel
(devicechannelN+16=bitnumber):
Whenthesebitsarecleared,thepowergood(PG)orGPIfromchannelNisnotusedinthe
logicalANDtoinitiatepower-onsequencing.Whenthesebitsareset,thePGorGPIisused.
15:12 0 Thesebitsalwaysreturna0.
11:8 SEQ_MATCH
These bits determine which SEQ signature the channel must match before initiating
poweronsequencing:
 0000 Disabled 1000 Signature8
 0001 Signature1 1001 Signature9
 0010 Signature2 1010 Signature10
 0011 Signature3 1011 Signature11
 0100 Signature4 1100 Signature12
 0101 Signature5 1101 Signature13
 0110 Signature6 1110 Signature14
 0111 Signature7 1111 Signature15
7:6 0 Thesebitsalwaysreturna0.
5:4 SELECT[1:0]
Thesebitsdeterminethesignalthatinitiatespower-onsequencing:
 SELECTEDPOWER-ON
SELECT[1:0] SEQUENCINGCONTROLSIGNAL SEQUENCINGTYPE
 00 SEQUENCE0orSEQUENCE1(usebit0) Timebased
 01 PG/GPIlogiccombination(usebits31:16) Eventbased
 10 SEQMatch(usebits11:8) Eventbased
 11 Reserved
3:1 0
Thesebitsalwaysreturna0.
0 SEQ_SELECT
0=SEQUENCE0
1=SEQUENCE1