LTM4631 datasheet(92/130 Pages) AD

92 / 130 page

LTM4686B

Rev. 0

For more information www.analog.com

APPENDIX C: PMBUS COMMAND DETAILS

This command has two data bytes and is formatted in Linear_16u format.

VOUT_UV_WARN_LIMIT

The VOUT_UV_ WARN_LIMIT command reads the value of the output voltage measured at the sense pins, in volts,

which causes an output voltage low warning.

In response to the VOUT_UV_WARN_LIMIT being exceeded, the device:

• Sets the NONE_OF_THE_ABOVE bit in the STATUS_BYTE

• Sets the VOUT bit in the STATUS_WORD

• Sets the VOUT Undervoltage Warning bit in the STATUS_VOUT command

• Notifies the host by asserting ALERT pin, unless masked.

This condition is detected by the ADC so the response time may be up to 90ms, typical.

This command has two data bytes and is formatted in Linear_16u format.

VOUT_UV_FAULT_LIMIT

The VOUT_UV_FAULT_LIMIT command reads the value of the output voltage measured at the sense pins, in volts,

which causes an output undervoltage fault.

This command has two data bytes and is formatted in Linear_16u format.

MFR_VOUT_MAX

The MFR_VOUT_MAX command is the maximum output voltage in volts for each channel including VOUT_OV_FAULT_

LIMIT. If the output voltages are set to high range (Bit 1 of MFR_PWM_MODE set to a 0) MFR_VOUT_MAX for channel

0 and 1 is 5.7V. If the output voltages are set to low range (Bit 1 of MFR_PWM_MODE set to a 1) the MFR_VOUT_MAX

for both channels is 2.75V. Entering VOUT_COMMAND values greater than this will result in a CML fault and the output

voltage setting will be clamped to the maximum level.

This read-only command has 2 data bytes and is formatted in Linear_16u format.

CURRENT

Input Current Calibration

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT

UNITS

NVM

DEFAULT

VALUE

MFR_IIN_OFFSET

0xE9

Coefficient used to add to the input current to

account for the IQ of the part.

R/W

Word

L11

0.04816

0x9315

MFR_IIN_OFFSET

The MFR_IIN_OFFSET command allows the user to set an input current representing the quiescent current of each

channel. For accurate results at low output current, the part should be in continuous conduction mode. (MFR_PWM_

MODE[0] = 1b). See Table 8 for recommended values.

This command has 2 data bytes and is formatted in Linear_5s_11s format.

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