LTC3883 Datasheet, PDF (78/112 Pages) Linear Technology – Single Phase Step-Down DC/DC Controller with Digital Power System Management

LTC3883/LTC3883-1
PMBus Command Details
Input Current
COMMAND NAME
IIN_OC_WARN_LIMIT
CMD CODE DESCRIPTION
0x5D Input overcurrent warning limit.
TYPE
R/W Word
DATA
FORMAT
L11
UNITS
A
DEFAULT
NVM
VALUE
Y
10.0
0xD280
IIN_OC_WARN_LIMIT
The IIN_OC_WARN_LIMIT command sets the value of the input current, in amperes, that causes a warning indicating
the input current is high. The READ_IIN value will be used to determine if this limit has been exceeded.
In response to the IIN_OC_WARN_LIMIT being exceeded, the device:
• Sets the OTHER bit in the STATUS_BYTE
• Sets the INPUT bit in the upper byte of the STATUS_WORD
• Sets the IIN Overcurrent Warning bit in the STATUS_INPUT command, and
• Notifies the host by asserting ALERT pin
This condition is detected by the ADC so the response time may be up to 120ms.
This command has two data bytes and is formatted in Linear_5s_11s format.
Temperature
External Temperature Calibration
COMMAND NAME
MFR_TEMP_1_GAIN
CMD CODE DESCRIPTION
0xF8 Sets the slope of the external temperature sensor.
MFR_TEMP_1_OFFSET
0xF9 Sets the offset of the external temperature sensor with
respect to –273.1°C.
DATA
DEFAULT
TYPE FORMAT UNITS NVM VALUE
R/W Word CF
Y
1.0
0x4000
R/W Word L11
C
Y
0.0
0x8000
MFR_TEMP_1_GAIN
The MFR_TEMP_1_GAIN command will modify the slope of the external temperature sensor to account for non-idealities
in the element and errors associated with the remote sensing of the temperature in the inductor.
This command has two data bytes and is formatted in 16-bit 2’s complement integer. N = 8192 to 32767. The effective
adjustment is N • 2^–14. The nominal value is 1.
MFR_TEMP_1_OFFSET
The MFR_TEMP_1_OFFSET command will modify the offset of the external temperature sensor to account for non-
idealities in the element and errors associated with the remote sensing of the temperature in the inductor.
This command has two data bytes and is formatted in Linear_5s_11s format. The part starts the calculation with a
value of –273.15 so the default adjustment value is zero.
3883f
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