Datasheet

LTC3880/LTC3880-1
98
3880fc
For more information www.linear.com/LTC3880
PMBus COMMAND DETAILS
TELEMETRY
COMMAND NAME
CMD
CODE DESCRIPTION TYPE PAGED FORMAT UNITS NVM
DEFAULT
VALUE
READ_VIN 0x88 Measured input supply voltage. R Word N L11 V NA
READ_VOUT 0x8B Measured output voltage. R Word Y L16 V NA
READ_IIN 0x89 Calculated input supply current. R Word N L11 A NA
MFR_READ_IIN 0xED Calculated input current per channel. R Word Y L11 A NA
READ_IOUT 0x8C Measured output current. R Word Y L11 A NA
READ_TEMPERATURE_1 0x8D External diode junction temperature. This is the value
used for all temperature related processing, including
IOUT_CAL_GAIN.
R Word Y L11 C NA
READ_TEMPERATURE_2 0x8E Internal junction temperature. Does not affect any
other registers.
R Word N L11 C NA
READ_DUTY_CYCLE 0x94 Duty cycle of the top gate control signal. R Word Y L11 % NA
READ_POUT 0x96 Calculated output power. R Word Y L11 W NA
MFR_VOUT_PEAK 0xDD Maximum measured value of READ_VOUT since last
MFR_CLEAR_PEAKS.
R Word Y L16 V NA
MFR_VIN_PEAK 0xDE Maximum measured value of READ_VIN since last
MFR_CLEAR_PEAKS.
R Word N L11 V NA
MFR_TEMPERATURE_1_PEAK 0xDF Maximum measured value of external Temperature
(READ_TEMPERATURE_1) since last MFR_CLEAR_
PEAKS.
R Word Y L11 C NA
MFR_TEMPERATURE_2_PEAK 0xF4 Maximum measured value of external Temperature
(READ_TEMPERATURE_2) since last MFR_CLEAR_
PEAKS.
R Word N L11 C NA
MFR_IOUT_PEAK 0xD7 Report the maximum measured value of READ_IOUT
since last MFR_CLEAR_PEAKS.
R Word Y L11 A NA
READ_VIN
The READ_VIN command returns the measured input voltage, in volts.
This read-only command has two data bytes and is formatted in Linear_5s_11s format.
READ_VOUT
The READ_VOUT command returns the measured output voltage in the same format as set by the VOUT_MODE
command.
This read-only command has two data bytes and is formatted in Linear_16u format.
READ_IIN
The READ_IIN command returns the input current in
Amperes. Note: Input current is calculated
from READ_IOUT
current and the READ_DUTY_CYCLE value from both outputs plus the MFR_IIN_OFFSET. For accurate values at low
currents the part must be in continuous conduction mode. The greatest source of error if DCR sensing is used, is the
accuracy of the inductor parasitic DC resistance (DCR) at room temperature IOUT_CAL_GAIN.
READ_IIN = MFR_READ_IIN_
PAGE0
+ MFR_READ_IIN_
PAGE1
This read-only command has two data bytes and is formatted in Linear_5s_11s format.