LTM4677 datasheet(73/110 Pages) AD

73 / 110 page

LTC3888-1

Rev. 0

For more information www.analog.com

ON_OFF_CONFIG

The ON_OFF_CONFIG command specifies the combination of RUN pin input state and PMBus commands needed to

turn the addressed output rail on and off.

Supported Values:

VALUE

MEANING

0x1F

OPERATION value and RUN pin must both command the device to start/run. Device executes immediate off when commanded off.

0x1E

OPERATION value and RUN pin must both command the device to start/run. Device uses TOFF_ command values when commanded off.

0x17

RUN pin control with immediate off when commanded off. OPERATION on/off control ignored.

0x16

RUN pin control using TOFF_ command values when commanded off. OPERATION on/off control ignored.

Programming an unsupported ON_OFF_CONFIG value will generate a CML fault and the command will be ignored.

This command has one data byte.

ON, OFF AND MARGIN CONTROL

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS NVM

DEFAULT

VALUE

ON_OFF_CONFIG

0x02 RUN pin and PMBus on/off command

configuration.

R/W Byte

Reg

0x1E

OPERATION

0x01 On, off and margin control.

R/W Byte

Reg

0x80

MFR_RESET

0xFD Force full reset without removing power.

Send Byte

MFR_CONFIG_ALL

The MFR_CONFIG_ALL command provides device-level configuration common to multiple ADI PMBus products.

Bit Definitions:

BIT

MEANING

Enable fault logging.

Ignore ILIM and PWM resistor configuration pins.

Disable CML fault for quick command message.

Disable SYNC output.

Enable 255ms PMBus timeout.

Require valid PEC for PMBus write.

Enable PMBus clock stretching.

Execute CLEAR_FAULTS when either channel is turned on by RUN pin or OPERATION command.

If a legal command is received with an invalid PEC, the LTC3888-1 will not execute the command, regardless of the state

of bit 2. If clock stretching is enabled, the LTC3888-1 only uses it as required, generally above SCL rates of 100kHz.

This command has one data byte.

PMBus COMMAND DETAILS (General Device Configuration/On, Off and Margin Control)

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