LTC2978
PMBus COMMAND DESCRIPTION
MFR_SPECIAL_LOT
These paged registers contain information that identifies the user configuration that was programmed at the factory.
MFR_SPECIAL_LOT Data Contents
BIT(S)
SYMBOL
OPERATION
b[7:±]
Mfr_special_lot
Contains the LTC default special lot number. Contact the factory to request a custom factory programmed user configura-
tion and special lot number.
MFR_VOUT_DISCHARGE_THRESHOLD
This register contains the coefficient that multiplies VOUT_COMMAND in order to determine the OFF thresh-
old voltage for the associated output. If the output voltage has not decayed below MFR_VOUT_DISCHARGE_
THRESHOLDꢀ•ꢀVOUT_COMMANDꢀpriorꢀtoꢀtheꢀchannelꢀbeingꢀcommandedꢀtoꢀenter/re-enterꢀtheꢀONꢀstate,ꢀbitꢀ[7]ꢀinꢀtheꢀ
STATUS_MFR_SPECIFIC register will be set and the ALERTB pin will be asserted low. In addition, the channel will not
enter the ON state until the output has decayed below its OFF threshold voltage.
Other channels can be held off if a particular output has failed to discharge by using the bidirectional FAULTBzn pins
(refer to the MFR_FAULTBzn_RESPONSE and MFR_FAULTBzn_PROPAGATE registers).
MFR_VOUT_DISCHARGE_THRESHOLD Data Contents
BIT(S)
SYMBOL
OPERATION
b[1ꢀ:±]
Mfr_vout_discharge_ The data uses the L11 format.
threshold
Units: Dimensionless, this register contains a coefficient.
MFR_COMMON
This command returns status information for the share-clock pin (SHARE_CLK) and the write-protect pin (WP).
MFR_COMMON Data Contents
BIT(S)
b[7:2]
b[1]
SYMBOL
OPERATION
Reserved
Read only, always returns ±s
Returns status of share-clock pin
1: Share-clock pin is being held low
±: Share-clock pin is active
Returns status of write-protect pin
1: Write-protect pin is high
±: Write-protect pin is low
Mfr_common_
share_clk
b[±]
Mfr_common_
write_protect
MFR_SPARE0
This 16-bit wide register can be used to store miscellaneous information. The contents of this register may be stored
and recalled from EEPROM using the STORE_USER_ALL and RESTORE_USER_ALL commands, respectively.
MFR_SPARE2
These 16-bit wide, paged registers can be used to store miscellaneous information. The contents of these registers may
bestoredandrecalledfromEEPROMusingtheSTORE_USER_ALLandRESTORE_USER_ALLcommands, respectively.
2978fc
53
Linear Systems [ Linear Systems ]
