Datasheet

MAX34446
PMBus Power-Supply Data Logger
9Maxim Integrated
Table 1. PMBus Command Codes (continued)
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
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.
CODE COMMAND NAME TYPE
PAGE
0–3
PAGE
4, 5, 6
PAGE
255
NO. OF
BYTES
LOCKED
(NOTE 2)
FLASH
STORED
(NOTE 3)
DEFAULT
VALUE
(NOTE 3)
(NOTE 1)
D7h MFR_VOUT_MIN R/W Word R/W — — 2 Y N 7FFFh
D9h MFR_FAULT_RESPONSE R/W Byte R/W R/W — 1 Y Y 00h
DAh MFR_FAULT_RETRY R/W Word R/W R/W — 2 Y Y 0000h
DBh MFR_PG_DELAY R/W Word R/W — — 2 Y Y 0000h
DCh MFR_NV_FAULT_LOG Block Read R R R 255 Y Y (Note 6)
DDh MFR_TIME_COUNT Block Read R/W R/W R/W 4 Y Y (Note 7)
E0h MFR_POUT_PEAK R/W Word R/W — — 2 Y N 0000h
E1h MFR_POUT_AVG R/W Word R/W — — 2 Y N 0000h
E2h MFR_IOUT_AVG R/W Word R/W — — 2 Y N 0000h
E3h MFR_TEMPERATURE_AVG R/W Word — R/W — 2 Y N 0000h
EFh MFR_SYNC_CONFIG R/W Word R/W R/W R/W 2 Y Y 0000h