Linear ANALOG DEVICES LTM4680, Operation Manual, Page: 108 / 126

LTM4680
108
Rev. B
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PMBus COMMAND DETAILS
STATUS_BYTE Message Contents:
BIT STATUS BIT NAME MEANING
7* BUSY A fault was declared because the LTM4680 was unable to respond.
6 OFF This bit is set if the channel is not providing power to its output, regardless of the reason, including simply not
being enabled.
5 VOUT_OV An output overvoltage fault has occurred.
4 IOUT_OC An output overcurrent fault has occurred.
3 VIN_UV Not supported (LTM4680 returns 0).
2 TEMPERATURE A temperature fault or warning has occurred.
1 CML A communications, memory or logic fault has occurred.
0* NONE OF THE ABOVE A fault Not listed in bits[7:1] has occurred.
* ALERT can be asserted if either of these bits is set. They may be cleared by writing a 1 to their bit position in the STATUS_BYTE, in lieu of a CLEAR_
FAULTS command.
This command has one data byte.
STATUS_WORD
The STATUS_WORD command returns a two-byte summary of the channel's fault condition. The low byte of the
STATUS_WORD is the same as the STATUS_BYTE command.
STATUS_WORD High Byte Message Contents:
BIT STATUS BIT NAME MEANING
15 V
OUT
An output voltage fault or warning has occurred.
14 I
OUT
An output current fault or warning has occurred.
13 INPUT An input voltage fault or warning has occurred.
12 MFR_SPECIFIC A fault or warning specific to the LTM4680 has occurred.
11 POWER_GOOD# The POWER_GOOD state is false if this bit is set.
10 FANS Not supported (LTM4680 returns 0).
9 OTHER Not supported (LTM4680 returns 0).
8 UNKNOWN Not supported (LTM4680 returns 0).
If any of the bits in the upper byte are set, NONE_OF_THE_ABOVE is asserted.
This command has two data bytes.