Analog Devices Linear LTM 4700 User Manual page 107

PMBus COMMAND DETAILS
STATUS_BYTE Message Contents:
BIT STATUS BIT NAME
7* BUSY
6 OFF
5 VOUT_OV
4 IOUT_OC
3 VIN_UV
2 TEMPERATURE
1 CML
0* NONE OF THE ABOVE
*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
15 V
OUT
14 I
OUT
13 INPUT
12 MFR_SPECIFIC
11 POWER_GOOD#
10 FANS
9 OTHER
8 UNKNOWN
If any of the bits in the upper byte are set, NONE_OF_THE_ABOVE is asserted.
This command has two data bytes.
STATUS_VOUT
The STATUS_VOUT command returns one byte of V
STATUS_VOUT Message Contents:
BIT MEANING
7 V overvoltage fault.
OUT
6 V overvoltage warning.
OUT
5 V undervoltage warning.
OUT
4 V undervoltage fault.
OUT
3 V max warning.
OUT
2 TON max fault.
1 TOFF max fault.
0 Not supported (LTM4700 returns 0).
MEANING
A fault was declared because the LTM4700 was unable to respond.
This bit is set if the channel is not providing power to its output, regardless of the reason, including simply not
being enabled.
An output overvoltage fault has occurred.
An output overcurrent fault has occurred.
Not supported (LTM4700 returns 0).
A temperature fault or warning has occurred.
A communications, memory or logic fault has occurred.
A fault Not listed in bits[7:1] has occurred.
MEANING
An output voltage fault or warning has occurred.
An output current fault or warning has occurred.
An input voltage fault or warning has occurred.
A fault or warning specific to the LTM4700 has occurred.
The POWER_GOOD state is false if this bit is set.
Not supported (LTM4700 returns 0).
Not supported (LTM4700 returns 0).
Not supported (LTM4700 returns 0).
OUT
For more information
status information.
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LTM4700
Rev. B
107