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电子发烧友网>电子资料下载>规则标准>max15303PMBus命令集,详细指南

max15303PMBus命令集,详细指南

2017-03-30 | pdf | 0.56 MB | 次下载 | 免费

资料介绍

  OPERATION Reference: Standard Command Lockable: Yes Command Code: 0x01 Format: Bit field Data Bytes: 1 Units: N/A Transfer: Read/Write Byte Factory Value: 0x40 (see Description table) Description/Notes: 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: 0x00 Immediate-off, no sequencing: both DH and DL outputs lowa (note: same as 0x01-0x3F) 0x40 Soft-off, with sequencing (factory setting)b (note: same as 0x41-0x7F) 0x80 Output enabled, if allowed by ON_OFF_CONFIG setting (note: same as 0x81-0x8F) 0x94 Margin low, ignore faults (note: same as 0x95-0x97) 0x98 Margin low, act on faults (note: same as 0x99-0x9B) 0xA4 Margin high, ignore faults (note: same as 0xA5-0xA7) 0xA8 Margin high, act on faults (note: same as 0xA9-0xAB) Invalid values for the OPERATION command: 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.

max15303PMBus命令集,详细指南

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