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PMBus COMMAND DETAILS
Fault Responses Input Voltage
COMMAND NAME
CMD CODE DESCRIPTION
VIN_OV_FAULT_RESPONSE
VIN_OV_FAULT_RESPONSE
The VIN_OV_FAULT_RESPONSE command instructs the device on what action to take in response to an input over-
voltage fault. The data byte is in the format given in Table 14.
The device also:
• Sets the NONE_OF_THE_ABOVE bit in the STATUS_BYTE
• Set the INPUT bit in the upper byte of the STATUS_WORD
• Sets the VIN Overvoltage Fault bit in the STATUS_INPUT command, and
• Notifies the host by asserting ALERT pin, unless masked
This command has one data byte.
Fault Responses Output Voltage
COMMAND NAME
CMD CODE DESCRIPTION
VOUT_OV_FAULT_RESPONSE
VOUT_UV_FAULT_RESPONSE
TON_MAX_FAULT_
RESPONSE
VOUT_OV_FAULT_RESPONSE
The VOUT_OV_FAULT_RESPONSE command instructs the device on what action to take in response to an output
overvoltage fault. The data byte is in the format given in Table 7.
The device also:
• Sets the VOUT_OV bit in the STATUS_BYTE
• Sets the VOUT bit in the STATUS_WORD
• Sets the VOUT Overvoltage Fault bit in the STATUS_VOUT command
• Notifies the host by asserting ALERT pin, unless masked
The only values recognized for this command are:
0x00–Part performs OV pull down only, or OV_PULLDOWN.
0x80–The device shuts down (disables the output) and the unit does not attempt to retry. (PMBus, Part II, Section 10.7).
0x56
Action to be taken by the device when an
input supply overvoltage fault is detected.
0x41
Action to be taken by the device when an
output overvoltage fault is detected.
0x45
Action to be taken by the device when an
output undervoltage fault is detected.
0x63
Action to be taken by the device when a
TON_MAX_FAULT event is detected.
For more information
TYPE
PAGED
FORMAT
R/W Byte
Y
TYPE
PAGED
R/W Byte
Y
R/W Byte
Y
R/W Byte
Y
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LTM4700
DATA
DEFAULT
UNITS
NVM
VALUE
Reg
Y
DATA
DEFAULT
FORMAT
UNITS
NVM
VALUE
Reg
Y
Reg
Y
Reg
Y
95
0x80
0xB8
0xB8
0xB8
Rev. B
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