Datasheet

MAX34446
PMBus Power-Supply Data Logger
24Maxim Integrated
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
Table 11. STATUS_WORD
Table 12. STATUS_VOUT
STATUS_VOUT (7Ah)
The STATUS_VOUT command returns 1 byte of information with contents as described in Table 12.
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.
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.
BIT BIT NAME MEANING
15 VOUT An output voltage fault has occurred.
14:13 0 These bits always return a 0.
12 MFR A bit in STATUS_MFR_SPECIFIC has been set.
11 POWER_GOOD#
Global power good has been negated. Applies to all monitored voltages. This is a status-only bit
and is not latched.
10:6 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.
BIT BIT NAME MEANING
7 VOUT_OV_FAULT VOUT overvoltage fault.
6 VOUT_OV_WARN VOUT overvoltage warning.
5 VOUT_UV_WARN VOUT undervoltage warning.
4 VOUT_UV_FAULT VOUT undervoltage fault.
3:0 0 These bits always return a 0.