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LTM4700
PMBus COMMAND DETAILS
Table 17. Data Byte Contents MFR_OT_FAULT_RESPONSE
BITS
DESCRIPTION
7:6
Response
For all values of bits [7:6], the LTM4700:
• Sets the corresponding fault bit in the status commands and
• Notifies the host by asserting ALERT pin, unless masked.
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 RUN pin, the OPERATION
command, or the combined action of the RUN pin and
OPERATION command, to turn off and then to turn back on, or
• Bias power is removed and reapplied to the LTM4700.
5:3
Retry Setting
2:0
Delay Time
Fault Responses External Temperature
COMMAND NAME
CMD CODE DESCRIPTION
OT_FAULT_ RESPONSE
0x50
UT_FAULT_ RESPONSE
0x54
OT_FAULT_RESPONSE
The OT_FAULT_RESPONSE command instructs the device on what action to take in response to an external overtem-
perature fault on the external temp sensors. The data byte is in the format given in Table 13.
The device also:
• Sets the TEMPERATURE bit in the STATUS_BYTE
• Sets the Overtemperature Fault bit in the STATUS_TEMPERATURE command, and
• Notifies the host by asserting ALERT pin, unless masked
This command has one data byte.
UT_FAULT_RESPONSE
The UT_FAULT_RESPONSE command instructs the device on what action to take in response to an external under-
temperature fault on the external temp sensors. The data byte is in the format given in Table 13.
The device also:
• Sets the TEMPERATURE bit in the STATUS_BYTE
• Sets the Undertemperature Fault bit in the STATUS_TEMPERATURE command, and
• Notifies the host by asserting ALERT pin, unless masked
100
Action to be taken by the device when an
external overtemperature fault is detected,
Action to be taken by the device when an
external undertemperature fault is detected.
For more information
VALUE
MEANING
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.
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.
XXX
Not supported. Value ignored
TYPE
PAGED
R/W Byte
Y
R/W Byte
Y
www.analog.com
DATA
DEFAULT
FORMAT UNITS
NVM
VALUE
Reg
Y
0xB8
Reg
Y
0xB8
Rev. B
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