Linear Technology LTC2977 Demo Board: Octal Power Supply Manager [Requires DC1613] DC2028A DC2028A Data Sheet
Product codes
DC2028A
LTC2977
60
2977fa
For more information
pMbus coMManD DescripTion
MFR_COMMON
This command returns status information for the alert pin (ALERTB), share-clock pin (SHARE_CLK), write-protect pin
This command returns status information for the alert pin (ALERTB), share-clock pin (SHARE_CLK), write-protect pin
(WP), and device busy state.
This is the only command that may still be read when the device is busy processing an EEPROM or other command. It
This is the only command that may still be read when the device is busy processing an EEPROM or other command. It
may be polled by the host to determine when the device is available to process a PMBus command. A busy device will
always acknowledge its address but will NACK the command byte and set Status_byte_busy and Status_word_busy
when it receives a command that it cannot immediately process.
MFR_COMMON Data Contents
BIT(S)
SYMBOL
OPERATION
b[7]
Mfr_common_alertb
Returns alert status.
1: ALERTB is de-asserted high.
0: ALERTB is asserted low.
1: ALERTB is de-asserted high.
0: ALERTB is asserted low.
b[6]
Mfr_common_busyb
Returns device busy status.
1: The device is available to process PMBus commands.
0: The device is busy and will NACK PMBus commands.
1: The device is available to process PMBus commands.
0: The device is busy and will NACK PMBus commands.
b[5:2]
Reserved
Read only, always returns 1s
b[1]
Mfr_common_share_clk
Returns status of share-clock pin
1: Share-clock pin is being held low
0: Share-clock pin is active
1: Share-clock pin is being held low
0: Share-clock pin is active
b[0]
Mfr_common_write_protect Returns status of write-protect pin
1: Write-protect pin is high
0: Write-protect pin is low
0: Write-protect pin is low
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_00, USER_DATA_01, MFR_LTC_RESERVED_1 and MFR_LTC_RESERVED_2 are all reserved for
These registers are provided as user scratchpad and additional manufacturer reserved locations.
USER_DATA_00, USER_DATA_01, MFR_LTC_RESERVED_1 and MFR_LTC_RESERVED_2 are all reserved for
manufacturer use. Such uses include manufacturer traceability information and LTpowerPlay
features like the
CRC calculation and storage for user EEPROM configurations.
USER_DATA_02 is reserved for OEM use. These 2 bytes might be used for OEM traceability or revision information.
USER_DATA_03 and USER_DATA_04 are available for user scratchpad use. These 18 bytes (1 unpaged word plus
USER_DATA_02 is reserved for OEM use. These 2 bytes might be used for OEM traceability or revision information.
USER_DATA_03 and USER_DATA_04 are available for user scratchpad use. These 18 bytes (1 unpaged word plus
8 paged words) might be used for traceability or revision information such as serial number, board model number,
assembly location, or assembly date.
All user and OEM scratchpad registers may be stored and recalled from EEPROM using the STORE_USER_ALL and
All user and OEM scratchpad registers may be stored and recalled from EEPROM using the STORE_USER_ALL and
RESTORE_USER_ALL commands.