LTC2972 datasheet(30/112 Pages) LINER

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LTC2972

2972fa

For more information www.linear.com/LTC2972

Data Formats

L11

Linear_5s_11s PMBus data field b[15:0].

Value = Y • 2N

where N = b[15:11] is a 5-bit two’s complement integer and Y = b[10:0] is an 11-bit two’s complement integer.

Example:

READ_VIN = 10V

For b[15:0] = 0xD280 = 1101_0010_1000_0000b

Value = 640 • 2–6 = 10

See PMBus Rev 1.1 Spec Part II: Paragraph 7.1.

L16

Linear_16u

PMBus data field b[15:0].

Value = Y • 2N where Y = b[15:0] is an unsigned integer and N = Vout_mode_parameter is a 5-bit two’s complement exponent

that is hardwired to –13 decimal.

Example:

VOUT_COMMAND = 4.75V

For b[15:0] = 0x9800 = 1001_1000_0000_0000b

Value = 38912 • 2–13 = 4.75

See PMBus Rev 1.1 Spec Part II: Paragraph 8.3.1.

Reg

PMBus data field b[15:0] or b[7:0].

Bit field meaning is defined in detailed PMBus Command Register Description.

Custom Format PMBus data field b[15:0].

Value is defined in detailed PMBus Command Register Description. This is often an unsigned or two’s complement integer

scaled by an MFR specific constant.

Summary Table

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS EEPROM

DEFAULT

VALUE:

FLOAT

HEX

REF

PAGE

MFR_FAULT_LOG_STATUS

0xED Fault logging status.

R Byte

Reg

MFR_FAULT_LOG

0xEE Fault log data bytes. This sequentially

retrieved data is used to assemble a

complete fault log.

R Block

Reg

MFR_COMMON

0xEF Manufacturer status bits that are common

across multiple ADI chips.

R Byte

Reg

MFR_IOUT_CAL_GAIN_TC

0xF6 Temperature coefficient applied to IOUT_

CAL_GAIN.

R/W Word

ppm

0x0000

MFR_RETRY_COUNT

0xF7 Retry count for all faulted off conditions that

enable retry.

R/W Byte

Reg

0x07

MFR_TEMP_1_GAIN

0xF8 Inverse of external diode temperature non

ideality factor. One LSB = 2–14.

R/W Word

0x4000

MFR_TEMP_1_OFFSET

0xF9 Offset value for the external temperature.

R/W Word

L11

°C

0x8000

MFR_IOUT_SENSE_VOLTAGE

0xFA Absolute value of the voltage between

ISENSEPn and ISENSEMn. One LSB = 3.05µV or

91.5µV.

R Word

3.05µV

MFR_VOUT_MIN

0xFB Minimum measured value of READ_VOUT.

R Word

L16

MFR_VIN_MIN

0xFC Minimum measured value of READ_VIN.

R Word

L11

MFR_TEMPERATURE_1_MIN

0xFD Minimum measured value of READ_

TEMPERATURE_1.

R Word

L11

°C

PMBus COMMAND SUMMARY

LTC2972 Datasheet(PDF) 30 Page - Linear Technology

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