Analog Devices Linear LTM 4700 User Manual page 40

LTM4700
OPERATION
Refer to Figure 7 for a legend.
Handshaking features are included to ensure robust system communication. Please refer to the PMBus Communication
and Command Processing subsection of the Applications Information section for further details.
SDA
t
t
f
LOW
SCL
t
HD(STA)
START
CONDITION
Table 6. Abbreviations of Supported Data Formats
PMBus
SPECIFICATION
TERMINOLOGY REFERENCE
L11 Linear Part II ¶7.1
L16 Linear VOUT_ Part II ¶8.2
MODE
CF DIRECT Part II ¶7.2
Reg Register Bits Part II ¶10.3
ASC Text Characters Part II ¶22.2.1
40
t
t
r
SU(DAT)
t
f
t
SU(STA)
t t
HD(DAT) HIGH
Figure 6. PMBus Timing Diagram
ADI
TERMINOLOGY DEFINITION
Linear_5s_1s Floating point 16-bit data: value = Y • 2
where N = b[15:11] and Y = b[10:0], both
two's compliment binary integers
Linear_16u Floating point 16-bit data: value = Y • 2
where Y = b[15:0], an unsigned integer
Varies 16-bit data with a custom format defined in
the detailed PMBus command description
Reg Per-bit meaning defined in detailed PMBus
command description
ASCII ISO/IEC 8859-1 [A05]
For more information
t t
HD(SDA) SP
t
REPEATED START
CONDITION
EXAMPLE
N
, b[15:0] = 0x9807 = 10011_000_0000_0111
value = 7 • 2
–12
, b[15:0] = 0x4C00 = 0100_1100_0000_0000
value = 19456 • 2
Often an unsigned or two's compliment
integer
PMBus STATUS_BYTE command
ADI (0x4C5443)
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t
r
t
BUF
SU(STO)
4700 F06
STOP START
CONDITION CONDITION
–13
= 854E-6
–12
= 4.75
Rev. B