Datasheet

LTC2974
79
2974fc
For more information www.linear.com/LTC2974
CAPABILITY
The CAPABILITY command provides a way for a host system to determine some key capabilities of the LTC2974.
CAPABILITY Data Contents
BIT(S) SYMBOL OPERATION
b[7] Capability_pec Hard coded to 1 indicating Packet Error Checking is supported. Reading the Mfr_config_all_pec_en bit will indicate
whether PEC is currently required.
b[6:5] Capability_scl_max Hard coded to 01b indicating the maximum supported bus speed is 400kHz.
b[4] Capability_smb_alert Hard coded to 1 indicating this device does have an ALERTB pin and does support the SMBus Alert Response Protocol.
b[3:0] Reserved Always returns 0.
PMBus_REVISION
PMBus_REVISION Data Contents
BIT(S) SYMBOL OPERATION
b[7:0] PMBus_rev Reports the PMBus standard revision compliance. This is hard-coded to 0x11 for revision 1.1.
MFR_SPECIAL_ID
This register contains the manufacturer ID for the LTC2974. Always returns 0x0213.
MFR_SPECIAL_LOT
These paged registers contain information that identifies the user configuration that was programmed at the factory.
Contact the factory to request a custom factory programmed user configuration and special lot number.
pMbus coMManD DescripTion
USER_DATA_00, USER_DATA_01, USER_DATA_02, USER_DATA_03, USER_DATA_04, MFR_LTC_RESERVED_1
and MFR_LTC_RESERVED_2
These registers are provided as user scratchpad and additional manufacturer reserved locations.
USER_DATA_03 and USER_DATA_04 are available for user scratch pad use. These 10 bytes (1 unpaged word plus
4 paged words) might be used for traceability or revision information such as serial number, board model number,
assembly location, or assembly date.
USER SCRATCHPAD
COMMAND NAME
CMD
CODE DESCRIPTION TYPE PAGED FORMAT UNITS EEPROM
DEFAULT
VALUE
REF
PAGE
USER_DATA_00 0xB0 Manufacturer reserved for LTpowerPlay. R/W Word N Reg Y N/A
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USER_DATA_01 0xB1 Manufacturer reserved for LTpowerPlay. R/W Word Y Reg Y N/A
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USER_DATA_02 0xB2 OEM Reserved. R/W Word N Reg Y N/A
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USER_DATA_03 0xB3 Scratchpad location. R/W Word Y Reg Y 0x00
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USER_DATA_04 0xB4 Scratchpad location. R/W Word N Reg Y 0x00
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MFR_LTC_RESERVED_1 0xB5 Manufacturer reserved. R/W Word Y Reg Y NA
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MFR_LTC_RESERVED_2 0xBC Manufacturer reserved. R/W Word Y Reg NA
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