LTM4677 datasheet(69/116 Pages) AD

69 / 116 page

LTC3883/LTC3883-1

Rev. F

For more information www.analog.com

OPERATION

The OPERATION command is used to turn the unit on and off in conjunction with the input from the RUN pin. It is also

used to cause the unit to set the output voltage to the upper or lower MARGIN VOLTAGEs. The unit stays in the com-

manded operating mode until a subsequent OPERATION command or change in the state of the RUN pin instructs the

device to change to another mode. If the part is stored in the MARGIN_LOW/HIGH state, the next RESET or POWER_ON

cycle will ramp to that state. If the OPERATION command is modified, for example ON is changed to MARGIN_LOW,

the output will move at a fixed slope set by the VOUT_TRANSITION_RATE.

Margin High (Ignore Faults) and Margin Low (Ignore Faults) operations are not supported by the LTC3883.

The part defaults to the ON state.

This command has one data byte.

Table 4. OPERATION Command Detail Command

OPERATION Data Contents When On_Off_Config_Use_PMBus Enables

Operation_Control

SYMBOL

ACTION

VALUE

BITS

FUNCTION

Turn off immediately

0x00

Turn on

0x80

Margin Low

0x98

Margin High

0xA8

Sequence off

0x40

OPERATION Data Contents When On_Off_Config is Configured Such That

OPERATION Command is Not Used to Command Channel On or Off

SYMBOL

ACTION

VALUE

BITS

FUNCTION

Output at Nominal

0x80

Margin Low

0x98

Margin High

0xA8

Note: Attempts to write a reserved value will cause a CML fault.

PMBus COMMAND DETAILS

LTM4677 Datasheet(PDF) 69 Page - Analog Devices

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