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MAX34446
PMBus Power-Supply Data Logger
Table 1. PMBus Command Codes (continued)
CODE
D7h
D9h
DAh
DBh
DCh
DDh
E0h
E1h
E2h
E3h
EFh
COMMAND NAME
MFR_VOUT_MIN
MFR_FAULT_RESPONSE
MFR_FAULT_RETRY
MFR_PG_DELAY
MFR_NV_FAULT_LOG
MFR_TIME_COUNT
MFR_POUT_PEAK
MFR_POUT_AVG
MFR_IOUT_AVG
MFR_TEMPERATURE_AVG
MFR_SYNC_CONFIG
TYPE
R/W Word
R/W Byte
R/W Word
R/W Word
Block Read
Block Read
R/W Word
R/W Word
R/W Word
R/W Word
R/W Word
PAGE
0–3
R/W
R/W
R/W
R/W
R
R/W
R/W
R/W
R/W
—
R/W
PAGE
4, 5, 6
(NOTE 1)
—
R/W
R/W
—
R
R/W
—
—
—
R/W
R/W
PAGE
255
—
—
—
—
R
R/W
—
—
—
—
R/W
NO. OF
BYTES
2
1
2
2
255
4
2
2
2
2
2
LOCKED
(NOTE 2)
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
FLASH
STORED
(NOTE 3)
N
Y
Y
Y
Y
Y
N
N
N
N
Y
DEFAULT
VALUE
(NOTE 3)
7FFFh
00h
0000h
0000h
(Note 6)
(Note 7)
0000h
0000h
0000h
0000h
0000h
Note 1: Common commands are shaded. Access through any page results in the same device response.
Note 2: If the device is locked, only the commands listed with “N” can be read. All other commands return FFh if read. Only the
PAGE 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: In the Flash Stored column, an “N” indicates that this parameter is not stored in flash memory when the STORE_DEFAULT_ALL
command is executed and the value shown in the Default Value column is automatically loaded upon power-on reset or
when the RST pin is asserted. A “Y” in the Flash Stored column indicates that the currently loaded value in this parameter
is stored in flash memory when the STORE_DEFAULT_All command is executed and is automatically loaded upon power-
on reset or when the RST pin is asserted and the value shown in the Default Value column is the value when shipped
from the factory. “FIXED” in the Flash Stored column means this value is fixed at the factory as a ROM value and cannot
be changed.
Note 4: The factory-set default value that contains the device revision numbers.
Note 5: The factory-set default value for this 8-byte block is 3130313031303130h.
Note 6: The factory-set default value for the complete block of the MFR_NV_FAULT_LOG is FFh.
Note 7: The factory-set default value for the complete block is 00h.
Detailed Description
The MAX34446 data logger for power supplies can
monitor voltages for overvoltage and undervoltage, as
well as for overcurrent conditions and overtemperature
conditions. The device constantly checks for user-
programmable thresholds; when these thresholds are
Maxim Integrated
exceeded, the device logs the recent real-time operating
conditions in nonvolatile flash memory. The device can
monitor up to four voltages or currents, and can monitor
three temperature sensors. See the Typical Application
Circuit/Block Diagram for more details.
9
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