LTM4677 datasheet(83/110 Pages) AD

83 / 110 page

LTC3888-1

Rev. 0

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MFR_VOUT_MAX

The MFR_VOUT_MAX command returns the maximum value, in volts, allowed for VOUT_MAX based on internal device

capability.

This read-only command has two data bytes in Linear_16u format.

VOUT_MARGIN_HIGH

The VOUT_MARGIN_HIGH command programs the value of VFB (or VOUT if VOUT_SCALE_LOOP has been defined),

in volts, to be produced when Margin High is set with the OPERATION command. The value must be greater than

VOUT_COMMAND. Execution of this command is delayed if VOUT_SCALE_LOOP is being processed.

This command has two data bytes in Linear_16u format.

VOUT_MARGIN_LOW

The VOUT_MARGIN_LOW command programs the value of VFB (or VOUT if VOUT_SCALE_LOOP has been defined),

in volts, to be produced when Margin Low is set with the OPERATION command. The value must be less than VOUT_

COMMAND. Execution of this command is delayed if VOUT_SCALE_LOOP is being processed.

This command has two data bytes in Linear_16u format.

VOUT_SCALE_LOOP

The VOUT_SCALE_LOOP command programs the gain, in volts per volt, produced from VFB to VOUT by the external

voltage feedback network. Values from 1 to 9 are considered valid. The LTC3888-1 will assert a CML fault and ignore

the value if an attempt is made to write VOUT_SCALE_LOOP to a value outside of this range.

This command has two data bytes in Linear_5s_11s format.

VOUT_OV_FAULT_LIMIT

The VOUT_OV_FAULT_LIMIT command sets the value value of VFB (or VOUT if VOUT_SCALE_LOOP has been defined),

in volts, that causes an output overvoltage fault. If VOUT_OV_FAULT_LIMIT is modified while the channel is on, 2ms

should be allowed for the new value to take effect. Modifying VOUT during that time can result in an erroneous OV fault.

The LTC3888-1 sets MFR_COMMON bits[6:5] low while a new VOUT_OV_FAULT_LIMIT is established. Execution of

this command is delayed if VOUT_SCALE_LOOP is being processed.

This command has two data bytes in Linear_16u format.

VOUT_OV_WARN_LIMIT

The VOUT_OV_WARN_LIMIT command sets the value, in volts, of the VSENSE± differential voltage measured by the

ADC that causes an output overvoltage warning. If the VOUT_OV_WARN_LIMIT is exceeded, the device:

• Sets the VOUT Bit in the STATUS_WORD

• Sets the VOUT Overvoltage Warning Bit in the STATUS_VOUT Command

• Notifies the Host by Asserting ALERT, Unless Masked

This command has two data bytes in Linear_16u format.

PMBus COMMAND DETAILS (Output Voltage and Limits)

LTM4677 Datasheet(PDF) 83 Page - Analog Devices