Datasheet

LTC3880/LTC3880-1
85
3880fc
For more information www.linear.com/LTC3880
Fault Responses IC Temperature
COMMAND NAME CMD CODE DESCRIPTION TYPE PAGED
DATA
FORMAT UNITS NVM
DEFAULT
VALUE
MFR_OT_FAULT_RESPONSE 0xD6 Action to be taken by the device when an
internal overtemperature fault is detected
R Byte N Reg 0xC0
MFR_OT_FAULT_RESPONSE
The MFR_OT_FAULT_RESPONSE command byte instructs the device on what action to take in response to an internal
overtemperature fault. The data byte is in the format given in Table 8.
The LTC3880 also:
• Sets the MFR bit in the STATUS_WORD, and
• Sets the Overtemperature Fault bit in the STATUS_MFR_SPECIFIC command
• Notifies the host by asserting ALERT pin
This command has one data byte.
Table 8. Data Byte Contents MFR_OT_FAULT_RESPONSE
BITS DESCRIPTION VALUE MEANING
7:6 Response
For all values of bits [7:6], the LTC3880:
• Sets the corresponding fault bit in the status commands and
• Notifies the host by asserting ALERT pin
The fault bit, once set, is cleared only when one or more of the
following events occurs:
• The device receives a CLEAR_FAULTS command
• The output is commanded through the RUNn pin, the
OPERATION command, or the combined action of the RUNn pin
and OPERATION command, to turn off and then to turn back on,
or
• Bias power is removed and reapplied to the LTC3880
00 Not supported. Writing this value will generate a CML fault.
01 Not supported. Writing this value will generate a CML fault
10 The device shuts down immediately (disables the output) and
responds according to the retry setting in bits [5:3].
11 The device’s output is disabled while the fault is present.
Operation resumes and the output is enabled when the fault
condition no longer exists.
5:3 Retry Setting 000 The unit does not attempt to restart. The output remains
disabled until the fault is cleared.
001-111 Not supported. Writing this value will generate CML fault.
2:0 Delay Time XXX Not supported. Value ignored
PMBus COMMAND DETAILS