ADP1055ACPZ-R7 datasheet(62/140 Pages) AD

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ADP1055

Data Sheet

Rev. A | Page 62 of 140

STANDARD PMBUS COMMAND DESCRIPTIONS

STANDARD PMBUS COMMANDS

OPERATION

The OPERATION command, in conjunction with the CTRL pin, is used to turn the device on and off. Illegal values are 11xxxxxx.

Table 14. Register 0x01—OPERATION

Bits

Bit Name

R/W

Description

[7:6]

Enable

R/W

These bits determine the device response to the OPERATION command.

00 = immediate off (no sequencing).

01 = soft off (power down according to the programmed TOFF_DELAY and TOFF_FALL).

10 = device on.

11 = reserved.

[5:0]

Reserved

Reserved.

ON_OFF_CONFIG

The ON_OFF_CONFIG command configures the combination of the CTRL pin input and the OPERATION command needed to turn

the device on and off, including how the device responds when power is applied. Illegal values are xxx100xx.

Table 15. Register 0x02—ON_OFF_CONFIG

Bits

Bit Name

R/W

Description

[7:5]

Reserved

Reserved.

Power-up control

R/W

Sets the device power-up response.

0 = device powers up when power is present.

1 = device powers up only when commanded by the CTRL pin and the OPERATION command.

Command

enable

R/W

Controls how the device responds to the OPERATION command.

0 = ignores OPERATION command.

1 = the OPERATION command must be set to 1 to enable the device (in addition to setting Bit 2).

Pin enable

R/W

Controls how the device responds to the value of the CTRL pin.

0 = ignores the CTRL pin.

1 = CTRL pin must be asserted to enable the device (in addition to setting Bit 3).

CTRL pin polarity

R/W

Sets the polarity of the CTRL pin.

0 = active low.

1 = active high.

CTRL pin power-

down action

R/W

Actions to take on power-down when power-down is activated by the CTRL pin.

0 = uses the TOFF_DELAY and TOFF_FALL values to stop the transfer of energy to the output.

1 = turns off the output and stops energy transfer to the output as quickly as possible.

CLEAR_FAULTS

The CLEAR_FAULTS command is a send byte, no data. This command clears all fault bits in all PMBus status registers simultaneously.

Table 16. Register 0x03—CLEAR_FAULTS

Bits

Bit Name

Type

Description

N/A

CLEAR_FAULTS

Send

Clears all bits in the PMBus status registers (Register 0x78 to Register 0x7E) simultaneously.

WRITE_PROTECT

The WRITE_PROTECT command is used to protect the PMBus device against accidental writes. Reads to the device are allowed

regardless of the setting of this command.

Table 17. Register 0x10—WRITE_PROTECT

Bits

Bit Name

R/W

Description

Write Protect 1

R/W

Setting this bit disables writes to all commands except WRITE_PROTECT.

Write Protect 2

R/W

Setting this bit disables writes to all commands except WRITE_PROTECT, OPERATION, and PAGE.

Write Protect 3

R/W

Setting this bit disables writes to all commands except WRITE_PROTECT, OPERATION, PAGE,

ON_OFF_CONFIG, and VOUT_COMMAND.

[4:0]

Reserved

Reserved.

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