MCPF1412M06 datasheet(39/63 Pages) MICROCHIP

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MCPF1412M06

PMBus Commands

Data Sheet

DS60001885C - 39

STATUS_BYTE (0x78)

The STATUS_BYTE command returns one byte of information with a summary of the most critical

faults.

COMMAND

STATUS_BYTE (LOW BYTE of STATUS_WORD)

Bit

Access

Default #

Bit [7]: A fault was declared because the device was busy and unable to respond

Bit [6]: This bit is asserted if the unit is not providing power to the output, regardless of the reason,

including simply not being enabled

Bit [5]: An output overvoltage fault has occurred

Bit [4]: An output overcurrent fault has occurred

Bit [3]: An input undervoltage fault has occurred

Bit [2]: A temperature fault or warning has occurred

Bit [1]: A communications, memory or logic fault has occurred

Bit [0]: A fault or warning not listed in bits [7:1] has occurred

STATUS_WORD (0x79)

The STATUS_WORD command returns two bytes of information with a summary of the unit’s fault

condition. Based on the information in these bytes, the host can get more information by reading

the appropriate status registers. The low byte of the STATUS_WORD is the same register as the

STATUS_BYTE command.

COMMAND

STATUS_WORD (HIGH BYTE of STATUS_WORD)

Bit

Access

Default #

Bit [7]: An output voltage fault or warning has occurred

Bit [6]: An output current fault or warning has occurred.

Bit [5]: An input voltage fault or warning has occurred

Bit [4]: A manufacturer specific fault or warning has occurred

Bit [3]: The POWER_GOOD signal, if present, is negated

Bit [2]: A fan or airflow fault or warning has occurred (not used)

Bit [1]: A bit in STATUS_OTHER is set

Bit [0]: A fault type not given in bits [15:1] of the STATUS_WORD has been detected

MCPF1412M06 Datasheet(PDF) 39 Page - Microchip Technology