MAX34446 Datasheet, PDF (24/36 Pages) Maxim Integrated Products – PMBus Power-Supply Data Logger Calculates Power Consumption

MAX34446
PMBus Power-Supply Data Logger
STATUS_BYTE (78h)
The STATUS_BYTE command returns 1 byte of information with a summary of the most critical faults. A value of 1
indicates that a fault or warning event has occurred and a 0 indicates otherwise. Bits for unsupported features are
reported as 0. The STATUS_BYTE cannot be restored by RESTORE_DEFAULT_ALL command. Table 10 describes the
STATUS_BYTE message content. This command is read-only.
Table 10. STATUS_BYTE
BIT
BIT NAME
MEANING
7:6
0
These bits always return a 0.
5
VOUT_OV
An overvoltage fault has occurred.
4
IOUT_OC
An overcurrent fault has occurred.
3
0
This bit always returns a 0.
2
TEMPERATURE A temperature fault or warning has occurred.
1
CML
A communication, memory, or logic fault has occurred.
0
NONE OF THE ABOVE A fault or warning not listed in bits [7:1] has occurred.
STATUS_WORD (79h)
The STATUS_WORD command returns 2 bytes of information with a summary of the reason for a fault. The low byte of
the STATUS_WORD is the same data as the STATUS_BYTE. Table 11 describes the STATUS_WORD message content.
Table 11. STATUS_WORD
BIT
15
14:13
12
11
10:6
5
4
3
2
1
0
BIT NAME
MEANING
VOUT
An output voltage fault has occurred.
0
These bits always return a 0.
MFR
A bit in STATUS_MFR_SPECIFIC has been set.
POWER_GOOD#
Global power good has been negated. Applies to all monitored voltages. This is a status-only bit
and is not latched.
0
These bits always return a 0.
VOUT_OV
An overvoltage fault has occurred.
IOUT_OC
An overcurrent fault has occurred.
0
This bit always returns a 0.
TEMPERATURE A temperature fault or warning has occurred.
CML
A communication, memory, or logic fault has occurred.
NONE OF THE ABOVE A fault or warning not listed in bits [7:1] has occurred.
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