Datasheet

LTC2977
25
2977fa
For more information www.linear.com/LTC2977
PMBus COMMAND SUMMARY
Summary Table
COMMAND NAME
CMD
CODE DESCRIPTION TYPE PAGED
DATA
FORMAT UNITS EEPROM
DEFAULT
VALUE
REF
PAGE
STATUS_CML 0x7E Communication and memory fault and
warning status.
R Byte N Reg NA 43
STATUS_MFR_SPECIFIC 0x80 Manufacturer specific fault and state
information.
R Byte Y Reg NA 43
READ_VIN 0x88 Input voltage measured at VIN_SNS pin. R Word N L11 V NA 44
READ_VOUT 0x8B DC/DC converter output voltage. R Word Y L16 V NA 44
READ_TEMPERATURE_1 0x8D Internal junction temperature. R Word N L11 °C NA 44
PMBUS_REVISION 0x98 PMBus revision supported by this device.
Current revision is 1.1.
R Byte N Reg 0x11 44
USER_DATA_00 0xB0 Manufacturer reserved for LTpowerPlay™. R/W Word N Reg Y NA 60
USER_DATA_01 0xB1 Manufacturer reserved for LTpowerPlay. R/W Word Y Reg Y NA 60
USER_DATA_02 0xB2 OEM reserved. R/W Word N Reg Y NA 60
USER_DATA_03 0xB3 Scratchpad location. R/W Word Y Reg Y 0x00 60
USER_DATA_04 0xB4 Scratchpad location. R/W Word N Reg Y 0x00 60
MFR_LTC_RESERVED_1 0xB5 Manufacturer reserved. R/W Word Y Reg Y NA 60
MFR_STATUS_2 0xB7 Additional manufacturer specific fault and
state information.
R Word Y Reg NA 62
MFR_LTC_RESERVED_2 0xBC Manufacturer reserved. R/W Word Y Reg NA 60
MFR_EE_UNLOCK 0
xBD Unlock user EEPROM for access by
MFR_EE_ERASE and MFR_EE_
DATA
commands.
R/W Byte N Reg NA 65
MFR_EE_ERASE 0xBE Initialize user EEPROM for bulk
programming by MFR_EE_DATA.
R/W Byte N Reg NA 66
MFR_EE_DATA 0xBF Data transferred to and from EEPROM
using sequential PMBus word reads or
writes. Supports bulk programming.
R/W Word N Reg NA 66
MFR_COMMAND_PLUS 0xC0 Alternate access to block read and other
data: commands for all hosts.
R/W Word N Reg NA 30
MFR_DATA_PLUS0 0xC1 Alternate access to block read and other
data: data for alternate host 0.
R/W Word N Reg NA 30
MFR_DATA_PLUS1 0xC2 Alternate access to block read an other
data: data for alternate host 1.
R/W Word N Reg NA 30
MFR_TELEMETRY 0xCF Telemetry data for all output channels. R Block N Reg NA 63
MFR_CONFIG_LT C 2977 0xD0 Configuration bits that are channel
specific.
R/W Word Y Reg Y 0x0080 45
MFR_CONFIG_ALL_
LT C 2977
0xD1 Configuration bits that are common to all
pages.
R/W Word N Reg Y 0x1C7B 49
MFR_FAULTBz0_
PROPAGATE
0xD2 Configuration that determines if a
channel’s faulted off state is propagated
to the FAULTB00 and FAULTB10 pins.
R/W Byte Y Reg Y 0x
00 50
MFR_FAULTBz1_
PROPAGATE
0xD3 Manufacturer configuration that
Configuration that determines if a
channel’s faulted off state is propagated
to the FAULTB01 and FAULTB11 pins.
R/W Byte Y Reg Y 0x00 50
MFR_PWRGD_EN 0xD4 Configuration for mapping PWRGD and
WDI/RESETB status to the PWRGD pin.
R/W Word N Reg Y 0x0000 51