LTM2987 datasheet(56/114 Pages) AD

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LTC2971

Rev. 0

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MFR_DAC

This command register allows the user to directly program the 10-bit DAC. Manual DAC writes require the channel

to be in the ON state,TON_RISE to have expired and MFR_CONFIG_LTC2971 b[5:4] = 10b or 11b. Writing MFR_

CONFIG_LTC2971 b[5:4] = 10b commands the DAC to hard connect with the value in Mfr_dac_direct_val. Writing

b[5:4] = 11b commands the DAC to soft connect. Once the DAC has soft connected, Mfr_dac_direct_val returns the

value that allowed the DAC to be connected without perturbing the power supply. MFR_DAC writes are ignored when

MFR_CONFIG_LTC2971 b[5:4] = 00b or 01b.

MFR_DAC Data Contents

BIT(S) SYMBOL

OPERATION

b[15:10] Reserved

Read only, always returns 0.

b[9:0] Mfr_dac_direct_val DAC code value.

OUTPUT CURRENT COMMANDS AND LIMITS

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED FORMAT UNITS EEPROM

DEFAULT

VALUE

REF

PAGE

IOUT_CAL_GAIN

0x38 The nominal resistance of the current sense

element in mΩ.

R/W Word

L11

mΩ

1.0

0xBA00

IOUT_CAL_OFFSET

0x39 Offset applied to the current sense measurement

in Amps.

R/W Word

L11

0.0

0x8000

IOUT_OC_WARN_LIMIT

0x4A Output overcurrent warning limit.

R/W Word

L11

5.0

0xCA80

MFR_IOUT_CAL_GAIN_TC

0xF6 Temperature coefficient applied to IOUT_CAL_

GAIN.

R/W Word

ppm

0x0

IOUT_CAL_GAIN and IOUT_CAL_OFFSET

The IOUT_CAL_GAIN command is used to set the ratio of the voltage at the current sense pins to the sensed current.

For devices using a fixed current sense resistor, it is the same value as the resistance of the resistor (units are expressed

in mΩ). IOUT_CAL_GAIN is internally limited to values between 0.01mΩ to 1,000mΩ. The register readback value

always returns what was last written and does not reflect internal limiting. IOUT_CAL_OFFSET is used to add a current

offset from the READ_IOUT results.

Calculations using IOUT_CAL_GAIN and IOUT_CAL_OFFSET are:

TCORRECTION = (1 + MFR_IOUT_CAL_GAIN_TC • 1E-6 • (READ_TEMPERATURE_1 + MFR_T_SELF_HEAT – 25.0))

READ_IOUT

VIOUT_SNSPn − VIOUT_SNSMn

(IOUT _CAL _GAIN)

•TCORRECTION

+IOUT _CAL _OFFSET

Note: TCORRECTION is limited by hardware to a value between 0.25 and 4.0.

READ_TEMPERATURE_2 is substituted for READ_TEMPERATURE_1 if the associated TSENSE network fails to

detect a valid temperature. See READ_TEMPERATURE_1 for more information.

PMBus COMMAND DESCRIPTION

LTM2987 Datasheet(PDF) 56 Page - Analog Devices

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