LTC2972 datasheet(49/112 Pages) LINER

49 / 112 page

LTC2972

2972fa

For more information www.linear.com/LTC2972

VIN_ON, VIN_OFF, VIN_OV_FAULT_LIMIT, VIN_OV_WARN_LIMIT, VIN_UV_WARN_LIMIT and

VIN_UV_FAULT_LIMIT

These commands provide voltage supervising limits for the input voltage VIN_SNS.

INPUT CURRENT AND ENERGY

COMMAND NAME

DESCRIPTION

TYPE

PAGED FORMAT UNITS EEPROM

DEFAULT

VALUE

REF

PAGE

MFR_EIN

0xC0 Input energy data bytes.

R Block

Reg

MFR_EIN_CONFIG

0xC1 Configuration register for energy and input current. R/W Byte

Reg

MFR_IIN_CAL_GAIN_TC 0xC3 Temperature coefficient applied to IIN_CAL_GAIN.

R/W Word

ppm

0x0

MFR_IIN_CAL_GAIN

0xE8 The nominal resistance of the current sense

element in mΩ.

R/W Word

L11

mΩ

1.0

0xBA00

MFR_CLEAR_ENERGY

0xCC Clear MFR_EIN time and energy values

Send Byte

Energy Measurement and Reporting

Input energy measurement and monitoring supports the following:

• Input energy derived from the accumulated product of READ_VIN and READ_IIN.

• Reporting input energy value as a 48-bit integer in mJ. Returning value in Joules eliminates the need for the host

to manage time.

• Reporting input energy time as a 48-bit integer in ms, where input energy time is the elapsed time since energy

monitoring was last reset.

• Resetting time and energy accumulators whenever MFR_EIN_CONFIG or MFR_CLEAR_ENERGY is written.

• Wrapping of time and energy accumulators when full.

• An optional HD mode allowing the user to give priority to energy measurement by forcing the ADC to measure

READ_VIN and READ_IIN between every other ADC measurement.

• Reporting energy and time values coherently.

• Ability to decrement energy to prevent rectification and accumulation of noise when the channel is off. Energy is

not allowed to decrement below zero.

MFR_EIN

Read only. This 12-byte data block returns the input energy value and time. Once the block read starts, MFR_EIN

updates are suspended until the block read completes. However, energy and time continue to accumulate internally

during block reads.

PMBus COMMAND DESCRIPTION

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