LTM2987 datasheet(32/114 Pages) AD

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LTC2971

Rev. 0

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Note 1: 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 –10 decimal. The LTC2971-3 Channel 1 has a –13 decimal.

Example:

VOUT_COMMAND = 4.75V

For b[15:0] = 0x1300 = 0001_0011_0000_0000b

Value = 4864 • 2–10 = 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.

Note 2: When two default values are shown, the first default value applies to LTC2971, LTC2971-1, LTC2971-2, and LTC2971-3

Channel 0. The second default value applies to LTC2971-3 Channel 1.

Summary Table

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT

(Note 1) UNITS EEPROM

DEFAULT

VALUE:

FLOAT HEX

(Note 2)

REF

PAGE

MFR_FAULT_LOG_

CLEAR

0xEC Initialize the EEPROM block reserved for

fault logging and clear any previous fault

logging locks.

Send Byte

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_

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

IOUT_SNSPn and IOUT_SNSMn. 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

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