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PMBus COMMAND DETAILS
VIN_UV_WARN_LIMIT
The VIN_UV_WARN_LIMIT command sets the value of input voltage measured by the ADC that causes an input under-
voltage warning. This warning is disabled until the input exceeds the input startup threshold value set by the VIN_ON
command and the unit has been enabled. If the V
•
Sets the INPUT Bit Is the STATUS_WORD
•
Sets the V
Undervoltage Warning Bit in the STATUS_INPUT Command
IN
•
Notifies the Host by Asserting ALERT, unless Masked
VIN_ON
The VIN_ON command sets the input voltage, in Volts, at which the unit starts power conversion.
This command has two data bytes and is formatted in Linear_5s_11s format.
VIN_OFF
The VIN_OFF command sets the input voltage, in Volts, at which the unit stops power conversion.
This command has two data bytes and is formatted in Linear_5s_11s format.
MFR_RVIN
The MFR_RVIN command is used to set the resistance value of the V
READ_VIN). Use a 1Ω resistor in series with SV
This command has two data bytes and is formatted in Linear_5s_11s format.
Output Voltage and Limits
COMMAND NAME
CMD CODE DESCRIPTION
VOUT_MODE
VOUT_MAX
VOUT_OV_FAULT_ LIMIT
VOUT_OV_WARN_ LIMIT
VOUT_MARGIN_HIGH
VOUT_COMMAND
VOUT_MARGIN_LOW
VOUT_UV_WARN_ LIMIT
VOUT_UV_FAULT_ LIMIT
MFR_VOUT_MAX
IN
IN
0x20
Output voltage format and exponent
–12
(2
).
0x24
Upper limit on the output voltage
the unit can command regardless of
any other commands.
0x40
Output overvoltage fault limit.
0x42
Output overvoltage warning limit.
0x25
Margin high output voltage set
point. Must be greater than VOUT_
COMMAND.
0x21
Nominal output voltage set point.
0x26
Margin low output voltage set
point. Must be less than VOUT_
COMMAND.
0x43
Output undervoltage warning limit.
0x44
Output undervoltage fault limit.
0xA5
Maximum allowed output voltage.
For more information
Voltage drops below the VIN_OV_WARN_LIMIT the device:
IN
pin to build the external V
TYPE
PAGED
R Byte
Y
R/W
Y
Word
R/W
Y
Word
R/W
Y
Word
R/W
Y
Word
R/W
Y
Word
R/W
Y
Word
R/W
Y
Word
R/W
Y
Word
R Word
Y
www.analog.com
LTM4700
pin filter element to 1000mΩ. (See also
filter on demo board.
IN
DATA
FORMAT
UNITS
Reg
L16
V
L16
V
L16
V
L16
V
L16
V
L16
V
L16
V
L16
V
L16
V
DEFAULT
NVM
VALUE
–12
2
0x14
Y
3.6
0x399A
Y
1.1
0x119A
Y
1.075
0x1133
Y
1.05
0x10CD
Y
1.0
0x1000
Y
0.95
0x0F33
Y
0.925
0x0ECD
Y
0.9
0x0E66
3.6
0x0399
Rev. B
85
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