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LTM4683
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_ICHIP_CAL_GAIN
The MFR_ICHIP_CAL_GAIN command is used to set the resistance value of the V
(See also READ_VIN). Set MFR_RVIN equal to 0 if no filter element is used.
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
92
IN
0x20
Output voltage format and exponent
–12
(2
)
0x24
The 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. It must be greater than
VOUT_COMMAND.
0x21
Nominal output voltage set point
0x26
Margin low output voltage
set point. It 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_UV_WARN_LIMIT, the device:
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
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pin filter element in milliohms.
IN
DATA
FORMAT
UNITS
NVM
Reg
L16
V
Y
L16
V
Y
L16
V
Y
L16
V
Y
L16
V
Y
L16
V
Y
L16
V
Y
L16
V
Y
L16
V
DEFAULT
VALUE
–12
2
0x14
1.1V
0x119A
0.55V
0x08CD
0.538
0x089A
0.525
0x0866
0.5
0x0800
0.475
0x079A
0.462
0x0766
0.45
0x0733
2.75
0x2C00
Rev. 0
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