SLDM-06D1Ax

25

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Rev. AC

41. PMBUS ENABLE ON/OFF

The module can also be turned on and off via the PMBus interface. The OPERATION command is used to actually turn the module on and off via

the PMBus, while the ON_OFF_CONFIG command configures the combination of analog ON/OFF pin input and PMBus commands needed to

turn the module on and off. Bit [7] in the OPERATION command data byte enables the module, with the following functions:

0 : Output is disabled

1 : Output is enabled

This module uses the lower five bits of the ON_OFF_CONFIG data byte to set various ON/OFF options as follows:

Bit Position

4

3

2

1

0

Access

r/w

r/w

r/w

r/w

r

Function

PU

CMD

CPR

POL

CPA

Default Value

1

0

1

1

1

PU: Sets the default to either operate any time input power is present or for the ON/OFF to be controlled by the analog ON/OFF input and the

PMBus OPERATION command. This bit is used together with the CP, CMD and ON bits to determine startup.

Bit Value

Action

0

Module powers up any time power is present regardless of state of the analog ON/OFF

pin

1

Module does not power up until commanded by the analog ON/OFF pin and the

OPERATION command as programmed in bits [2:0] of the ON_OFF_CONFIG register.

CMD: The CMD bit controls how the device responds to the OPERATION command.

Bit Value

Action

0

Module ignores the ON bit in the OPERATION command

1

Module responds to the ON bit in the OPERATION command

CPR: Sets the response of the analog ON/OFF pin. This bit is used together with the CMD, PU and ON bits to determine startup.

Bit Value

Action

0

Module ignores the analog ON/OFF pin, i.e. ON/OFF is only controlled through the

PMBUS via the OPERATION command

1

Module requires the analog ON/OFF pin to be asserted to start the unit