LTC2977 datasheet(62/138 Pages) AD

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LTM4664A

Rev. 0

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PMBus COMMAND SUMMARY

Table 8. Data Format Abbreviations

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:

For b[15:0] = 0x9807 = ‘b10011_000_0000_0111

Value = 7 • 2–13 = 854 • 10–6

From “PMBus 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 –12 decimal

Example:

For b[15:0] = 0x9800 = ‘b1001_1000_0000_0000

Value = 19456 • 2–12 = 4.75 From “PMBus Spec Part II: Paragraph 8.2”

Reg

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

Bit field meaning is defined in detailed PMBus Command Description.

L16

Integer Word

PMBus data field b[15:0]

Value = Y

where Y = b[15:0] is a 16-bit unsigned integer

Example:

For b[15:0] = 0x9807 = ‘b1001_1000_0000_0111

Value = 38919 (decimal)

Custom Format

Value is defined in detailed PMBus Command Description.

This is often an unsigned or two’s complement integer scaled by an MFR specific constant.

ASC

ASCII Format

A variable length string of text characters conforming to ISO/IEC 8859-1 standard.

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