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¡¡¡¡OPERATION Reference£º Standard Command Lockable£º Yes Command Code£º 0x01 Format£º Bit field Data Bytes£º 1 Units£º N/A Transfer£º Read/Write Byte Factory Value£º 0x40 £¨see Description table£© Description/Notes£º See Section 12.1 of the PMBus Specification Part II. If the values of VOUT_OV_FAULT_LIMIT or VOUT_UV_FAULT_LIMIT are set between the values of VOUT_MARGIN_HIGH and VOUT_MARGIN_LOW£¬ it is possible that a fault will be detected when exiting the ¡°Margin High/Low £¨Ignore Fault£©¡± command states. This occurs when fault detection is reenabled before the output has had time to return to the VOUT_COMMAND value. This condition can be avoided in most cases by increasing the value of VOUT_TRANSITION_RATE£¬ thereby decreasing the amount of time required for the output to return to normal VOUT_COMMAND setpoint. The value of the OPERATION command is maintained in volatile memory£¬ and cannot be stored in the Default Store or User Store nonvolatile memory. This prevents inadvertent preservation of a margin-high or margin-low state. If it is desired to keep the output always enabled or always disabled upon power-up£¬ this can be achieved by storing the appropriate value of the ON_OFF_CONFIG command. Useful values for the OPERATION command£º 0x00 Immediate-off£¬ no sequencing£º both DH and DL outputs lowa £¨note£º same as 0x01-0x3F£© 0x40 Soft-off£¬ with sequencing £¨factory setting£©b £¨note£º same as 0x41-0x7F£© 0x80 Output enabled£¬ if allowed by ON_OFF_CONFIG setting £¨note£º same as 0x81-0x8F£© 0x94 Margin low£¬ ignore faults £¨note£º same as 0x95-0x97£© 0x98 Margin low£¬ act on faults £¨note£º same as 0x99-0x9B£© 0xA4 Margin high£¬ ignore faults £¨note£º same as 0xA5-0xA7£© 0xA8 Margin high£¬ act on faults £¨note£º same as 0xA9-0xAB£© Invalid values for the OPERATION command£º 0x90-0x93 0x9C-0x9F 0xA0-0xA3 0xAC-0xFF These invalid data bytes will trigger an ¡°Invalid Or Unsupported Data¡± response per section 10.9.3 of the PMBus specification. After writing the OPERATION command to enable the output£¬ the PMBus master must either wait for a time equal to £¨TON_DELAY + TON_RISE + 50ms£©£¬ or wait for PG to assert£¬ before sending additional PMBus commands.