LTC2978CUP View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2978CUP' PDF : 64 Pages View PDF
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[7:0]
Mfr_special_lot Contains the LTC default special lot number. Contact the factory to request a custom factory programmed user configu-
ration and special lot number.
MFR_VOUT_DISCHARGE_THRESHOLD
This register contains the coefficient that multiplies VOUT_COMMAND in order to determine the OFF threshold
voltage for the associated output. If the output voltage has not decayed below MFR_VOUT_DISCHARGE_
THRESHOLD • VOUT_COMMAND prior to the channel being commanded to enter/re-enter the ON state, the Status_
mfr_discharge bit in the 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. Setting
this to a value greater than 1.0 effectively disables DISCHARGE_THRESHOLD checking, allowing the channel to turn
back on even if it has not decayed at all.
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[15:0]
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)
SYMBOL
OPERATION
b[7:2]
Reserved
Read only, always returns 0s
b[1]
Mfr_common_ Returns status of share-clock pin
share_clk
1: Share-clock pin is being held low
0: Share-clock pin is active
b[0]
Mfr_common_ Returns status of write-protect pin
write_protect 1: Write-protect pin is high
0: Write-protect pin is low
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
be stored and recalled from EEPROM using the STORE_USER_ALL and RESTORE_USER_ALL commands, respectively.
2978fd
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