LTM4675 datasheet(97/136 Pages) LINER

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LTM4676A

4676afa

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appenDix c: pMbus coMManD DeTails

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

0.0305

0x8BE7

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.

Output Current Calibration

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS

NVM

DEFAULT

VALUE

IOUT_CAL_GAIN

0x38 The ratio of the voltage at the current

sense pins to the sensed current.

R/W Word

L11

mΩ

Factory-

Only NVM

Trimmed,

3.28mΩ typical

MFR_IOUT_CAL_GAIN_TC

0xF6 Temperature coefficient of the current

sensing element.

R/W Word

3860

0x0F14

IOUT_CAL_GAIN

The IOUT_CAL_GAIN command is nominally used to set the resistance value of the current sense element, in mil-

liohms. (see also MFR_IOUT_CAL_GAIN_TC). Writes to this register result in a NACK and do not impact output current

readback telemetry.

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

MFR_IOUT_CAL_GAIN_TC

TheMFR_IOUT_CAL_GAIN_TCcommandallowstheusertoprogramthetemperaturecoefficientoftheIOUT_CAL_GAIN

inductor DCR in ppm/°C.

This command has two data bytes and is formatted in 16-bit 2’s complement integer ppm. N = –32768 to 32767 •

10–6. Nominal temperature is 27°C. The IOUT_CAL_GAIN is multiplied by:

[1.0 + MFR_IOUT_CAL_GAIN_TC • (READ_TEMPERATURE_1-27)]. DCR sensing will have a typical value of 3900.

The IOUT_CAL_GAIN and MFR_IOUT_CAL_GAIN_TC impact all current parameters including: READ_IOUT, READ_IIN,

IOUT_OC_FAULT_LIMIT and IOUT_OC_WARN_LIMIT. Writes to this register are not recommended; use the factory-

default value.

Input Current

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT

UNITS

NVM

DEFAULT

VALUE

IIN_OC_WARN_LIMIT

0x5D

Input overcurrent warning limit.

R/W Word

L11

0xD300

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