E
NGINEERING
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EPARTMENT
706679 Rev 09-26-18
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Supported Commands
Notes:
1)
When applicable, PMBus commands use the direct data format.
2)
Packet Error Checking (PEC) is not supported.
3)
General Call Address (0x00, Global Broadcast) is not supported.
4)
All PMBus reads are a combined data format, where there is no stop condition (stop bit) between the
write data portion (PMBus command) and the read data portion. Instead, there is a repeated start
condition (start bit) before the change of direction (repeated slave address with read bit) in the transfer.
Refer to the PMBus Specification Part II for detailed descriptions of the following supported commands:
OPERATION 0x01
An OPERATION command will cause the OPERATION byte to be written if the data is valid, but the command
will only be processed if the RE (Remote Enable) signal is not at logic low at the time that the OPERATION
command is issued. Valid data values that can be written to the OPERATION byte are 0x00 and 0x80. All other
values will be discarded. A change in the state of the remote enable (RE) signal will override any previous
OPERATION command that was issued.
Data of 0x80 will enable the main and 12Vaux outputs.
Data of 0x00 will disable the main and 12Vaux outputs.
CLEAR_FAULT 0x03
Clears the status byte and status word.
STATUS_BYTE 0x78
Returns the Low byte of the Status Word. See Table 8.
