Datasheet

LTC2974
24
2974fc
For more information www.linear.com/LTC2974
pMbus coMManD suMMary
Summary Table
COMMAND NAME
CMD
CODE DESCRIPTION TYPE PAGED
DATA
FORMAT UNITS EEPROM
DEFAULT
VALUE:
FLOAT
HEX
REF
PAGE
TON_DELAY 0x60 Time from CONTROL pin and/or
OPERATION command = ON to V
OUT_EN
pin = ON.
R/W Word Y L11 ms Y 1.0
0xBA00
51
TON_RISE 0x61 Time from when the V
OUT_ENn
pin goes
high until the LTC2974 optionally soft-
connects its DAC and begins to servo the
output voltage to the desired value.
R/W Word Y L11 ms Y 10.0
0xD280
51
TON_MAX_FAULT_LIMIT 0x62 Maximum time from V
OUT_EN
pin on
assertion that an UV condition will be
tolerated before a TON_MAX_FAULT
condition results.
R/W Word Y L11 ms Y 15.0
0xD3C0
51
TON_MAX_FAULT_RESPONSE 0x63 Action to be taken by the device when a
TON_MAX_FAULT event is detected.
R/W Byte Y Reg Y 0xB8
54
TOFF_DELAY 0x64 Time from CONTROL pin and/or
OPERATION command = OFF to V
OUT_EN
pin = OFF.
R/W Word Y L11 ms Y 1.0
0xBA00
51
STATUS_BYTE 0x78 One byte summary of the unit’s fault
condition.
R Byte Y Reg NA
61
STATUS_WORD 0x79 Two byte summary of the unit’s fault
condition.
R Word Y Reg NA
61
STATUS_VOUT 0x7A Output voltage fault and warning status. R Byte Y Reg NA
61
STATUS_IOUT 0x7B Output current fault and warning status. R Byte Y Reg NA
61
STATUS_INPUT 0x7C Input supply fault and warning status. R Byte N Reg NA
61
STATUS_TEMPERATURE 0x7D External temperature fault and warning
status for READ_TEMPERATURE_1.
R Byte Y Reg NA
61
STATUS_CML 0x7E Communication and memory fault and
warning status.
R Byte N Reg NA
61
STATUS_MFR_SPECIFIC 0x80 Manufacturer specific fault and state
information.
R Byte Y Reg NA
61
READ_VIN 0x88 Input supply voltage. R Word N L11 V NA
66
READ_VOUT 0x8B DC/DC converter output voltage. R Word Y L16 V NA
66
READ_IOUT 0x8C DC/DC converter output current. R Word Y L11 A NA
66
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
66
READ_TEMPERATURE_2 0x8E Internal junction temperature. R Word N L11 °C NA
66
READ_POUT 0x96 DC/DC converter output power. R Word Y L11 W NA
66
PMBUS_REVISION 0x98 PMBus revision supported by this device.
Current revision is 1.1.
R Byte N Reg 0x11
78
USER_DATA_00 0xB0 Manufacturer reserved for LTpowerPlay. R/W Word N Reg Y N/A
79
USER_DATA_01 0xB1 Manufacturer reserved for LTpowerPlay. R/W Word Y Reg Y N/A
79
USER_DATA_02 0xB2 OEM Reserved. R/W Word N Reg Y N/A
79