Datasheet

MAX34451 PMBus 16-Channel V/I Monitor and
12-Channel Sequencer/Marginer
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MFR_TIME_COUNT (DDh)
The MFR_TIME_COUNT command returns the current
value of a real-time counter that increments every 5ms,
20ms, 80ms, or 160ms depending on the configuration
oftheNV_LOG_DEPTHbitsinMFR_NV_LOG_CONFIG.
This counter is useful in determining the time between
multiple faults. The counter is a 32-bit value that rolls
over. The count is reset to zero upon device power cycle
or RST
action,orasoft-reset.MFR_TIME_COUNTcan
be preset to any value and starts counting up from the
preset value.
MFR_CHANNEL_CONFIG (E4h)
The MFR_CHANNEL_CONFIG command is used to
configure the monitoring channels (PAGES 0–15). This
command should not be changed while the power
supplies are operating. The MFR_CHANNEL_CONFIG
commandisdescribedinTable35andshowninFigure
12.
Each RSn/GPIn pin can be independently configured
usingtheSELECT[5:0]bitstooneofthefollowing:
● Monitor voltage; use the monitored voltage for
sequencing(SELECT[5:0]=10h)
● Monitor voltage; do not use for sequencing
(SELECT[5:0]=20h)
● Monitorcurrent(SELECT[5:0]=22h)
● Readvoltageonly;donotmonitorforvoltagefaultsor
warnings(SELECT[5:0]=21h)
● Readcurrentonly;donotmonitorforcurrentfaultsor
warnings(SELECT[5:0]=23h)
● General-purposeinput(GPI);activelow(SELECT[5:0]
=30h)
● General-purposeinput(GPI);activehigh(SELECT[5:0]
=34h)
● Inputisdisabled(SELECT[5:0]=00h)
If the monitoring channel is configured to monitor voltage
for sequencing (SELECT[5:0] = 10h), then the associ-
atedPSENnoutputchannelmustalsobeconfiguredfor
controlling power supplies by setting the SELECT bits
in MFR_PSEN_CONFIG to 000. See the MFR_PSEN_
CONFIGcommanddescriptionformoredetails.
When the RSn/GPIn pins are configured as general-
purpose inputs (GPIs) the READ_VOUT command
reports0000hwhenthepinisinactiveand0001hwhen
the pin is active.
Also, when the RSn/GPInpins are configured to moni-
tor voltage (SELECT[5:0] = 10h or 20h) or act as
GPI (SELECT[5:0] = 30h or 34h), each channel can
be independently configured to generate a signature
signal at the SEQ output. This would facilitate event-
basedsequencing(in multipledevicesystems),by indi-
catingthatthispower supplyhasreacheditsPOWER_
GOOD_ON level and other channels can now proceed
with their power-up.