LTM4677 datasheet(74/110 Pages) AD

74 / 110 page

LTC3888-1

Rev. 0

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OPERATION

The OPERATION command is used to turn the related output rail on and off in conjunction with RUN pin hardware

control. This command may also be used to move the output voltage to margin levels. VOUT changes commanded by

OPERATION margin commands occur at the programmed VOUT_TRANSITION_RATE. The unit stays in the commanded

operating state until an OPERATION command or RUN pin voltage instructs the device to change to another state.

Execution of margin commands is delayed until any on-going output transition sequencing is completed. Margin

operations that ignore faults are not supported by the LTC3888-1.

Supported Values:

VALUE

MEANING

0xA8

Margin high.

0x98

Margin low.

0x80

On (i.e. nominal VOUT, even if bit 3 of ON_OFF_CONFIG is not set).

0x40*

Soft off (with sequencing).

0x00*

Immediate off (no sequencing).

*Device does not respond to these commands if bit 3 of ON_OFF_CONFIG is not set.

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

This command has one data byte.

MFR_RESET

This command provides a means to fully reset the LTC3888-1 from the serial bus. This forces the LTC3888-1 to turn

off all PWM channels, load the operating memory from internal EEPROM, clear all faults and then perform a soft-start

of all PWM channels that are enabled.

This write-only command has no data bytes.

PMBus COMMAND DETAILS (On, Off and Margin Control)

LTM4677 Datasheet(PDF) 74 Page - Analog Devices