Datasheet

LTC3880/LTC3880-1
92
3880fc
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STATUS_BYTE
The STATUS_BYTE command returns a one-byte summary of the most critical faults.
STATUS_BYTE Message Contents:
BIT STATUS BIT NAME MEANING
7* BUSY A fault was declared because the LTC3880 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 (LTC3880 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.
Any supported fault bit in this command will initiate an ALERT event.
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 STA
-
TUS_WORD is typically the same as the STATUS_BYTE command: However, if a fault occurs at the exact right time, the
read value can have a bit set in the lower byte with no corresponding bits set in the upper byte. An immediate second
read of STA
TUS_WORD will have the corresponding bits in the upper byte set.
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 LTC3880 has occurred.
11 POWER_GOOD# The POWER_GOOD state is false if this bit is set.
10 FANS Not supported (LTC3880 returns 0).
9 OTHER Not supported (LTC3880 returns 0).
8 UNKNOWN Not supported (LTC3880 returns 0).
Any supported fault bit in this command will initiate an ALERT event.
This command has two data bytes.
PMBus COMMAND DETAILS