LTC3882_15 Datasheet, PDF (82/104 Pages) Linear Technology – Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management

LTC3882
PMBus COMMAND DETAILS (External Temperature and Limits)
EXTERNAL TEMPERATURE AND LIMITS
COMMAND NAME
CMD
CODE DESCRIPTION
DATA
DEFAULT
TYPE PAGED FORMAT UNITS NVM VALUE
MFR_TEMP_1_GAIN
0xF8 Set slope for external temperature
calculations.
R/W Word Y
CF
l
1.0
0x4000
MFR_TEMP_1_OFFSET
0xF9 Offset addend for external temperature
calculations.
R/W Word Y
L11 °C or V l
0.0
0x8000
OT_FAULT_LIMIT
0x4F External overtemperature fault limit.
R/W Word Y
L11
°C l 100.0°C
0xEB20
OT_WARN_LIMIT
0x51 External overtemperature warning limit.
R/W Word Y
L11
°C l 85.0°C
0xEAA8
UT_FAULT_LIMIT
0x53 External undertemperature fault limit.
R/W Word Y
L11
°C l –40.0°C
0xE580
Related commands: STATUS_TEMPERATURE, SMBALERT_MASK, MFR_TEMPERATURE1_PEAK, OT_FAULT_RESPONSE, UT_FAULT_RESPONSE,
STATUS_MFR_SPECIFIC, READ_TEMPERATURE_2, MFR_OT_FAULT_RESPONSE, MFR_PWM_MODE_LTC3882
MFR_TEMP_1_GAIN
The MFR_TEMP_1_GAIN command sets the slope used in the calculation of external temperature to account for non-
idealities in the element and remote sensing errors, if any. Refer to the MFR_PWM_MODE_LTC3882 command for
equation details.
This command has two data bytes representing a 2’s complement integer.
MFR_TEMP_1_OFFSET
The MFR_TEMP_1_OFFSET command sets the offset used in the calculation of external temperature to account for
non-idealities in the element and remote sensing errors, if any. The unit of measure for MFR_TEMP1_OFFSET depends
on bit 5 of MFR_PWM_MODE. MFR_TEMP1_ OFFSET is expressed volts if this bit is set and in °C otherwise. Refer to
the MFR_PWM_MODE_ LTC3882 command for equation details.
This command has two data bytes in Linear_5s_11s format.
OT_FAULT_LIMIT
The OT_FAULT_LIMIT command sets the value of sensed external temperature, in degrees Celsius, which causes an
overtemperature fault.
This command has two data bytes in Linear_5s_11s format.
OT_WARN_LIMIT
The OT_WARN_LIMIT command sets the value of sensed external temperature, in degrees Celsius, which causes an
overtemperature warning. If the OT_WARN_LIMIT is exceeded, the device:
• Sets the TEMPERATURE Bit in the STATUS_BYTE
• Sets the Overtemperature Warning Bit in the STATUS_TEMPERATURE Command
• Notifies the Host by Asserting ALERT, Unless Masked
This command has two data bytes in Linear_5s_11s format.
3882f
82
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