LTC2977 datasheet(53/138 Pages) AD

53 / 138 page

LTM4664A

Rev. 0

For more information www.analog.com

Refer to Figure 11 for a legend.

Handshaking features are included to ensure robust system communication. Please refer to the PMBus Communication

and Command Processing subsection of the Dual 25A/30A PSM Applications Information section for further details.

SDA

SCL

tHD(STA)

tHD(DAT)

tSU(STA)

tSU(STO)

tSU(DAT)

tLOW

tHD(SDA)

tSP

tBUF

START

CONDITION

STOP

CONDITION

REPEATED START

CONDITION

START

CONDITION

tHIGH

4664A F10

Figure 10. PMBus Timing Diagram

Table 6. Abbreviations of Supported Data Formats

PMBus

LTC

TERMINOLOGY DEFINITION

EXAMPLE

TERMINOLOGY

SPECIFICATION

REFERENCE

L11

Linear

Part II ¶7.1

Linear_5s_11s Floating point 16-bit data: value = Y • 2N,

where N = b[15:11] and Y = b[10:0], both

two’s compliment binary integers

b[15:0] = 0x9807 = 10011_000_0000_0111

value = 7 • 2–13 = 854E-6

L16

Linear

VOUT_MODE

Part II ¶8.2

Linear_16u

Floating point 16-bit data: value = Y • 2–12,

where Y = b[15:0], an unsigned integer

b[15:0] = 0x4C00 = 0100_1100_0000_0000

value = 19456 • 2–12 = 4.75

DIRECT

Part II ¶7.2

Varies

16-bit data with a custom format defined in

the detailed PMBus command description

Often an unsigned or two’s compliment

integer

Reg

Part II ¶10.3

Reg

Per-bit meaning defined in detailed PMBus

command description

PMBus STATUS_BYTE command

ASC

Text Characters

Part II ¶22.2.1

ASCII

ISO/IEC 8859-1 [A05]

LTC (0x4C5443)

DUAL 25A/30A PSM OPERATION

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