Analog Devices LTM4683 Manual page 54

LTM4683
PMBus COMMAND SUMMARY
Table 7. PMBus Commands Summary (NOTE: The Data Format Abbreviations are Detailed in Table 8)
CMD
COMMAND NAME CODE DESCRIPTION
MFR_TEMP_1_OFFSET 0xF9
MFR_RAIL_ADDRESS 0xFA
MFR_REAL_TIME 0xFB
MFR_RESET 0xFD Commanded reset without requiring a
Note 1: Commands indicated with Y in the NVM column indicate that these commands are stored and restored using the STORE_USER_ALL and
RESTORE_USER_ALL commands, respectively.
Note 2: Commands with a default value of NA indicate "not applicable". Commands with a default value of FS indicate "factory set on a per part basis".
Note 3: The LTM4683 contains additional commands not listed in Table 7. Reading these commands is harmless to the operation of the IC; however, the
contents and meaning of these commands can change without notice.
Note 4: Some unpublished commands are read-only and will generate a CML bit 6 fault if written.
Note 5: Writing to commands not published in Table 7 is not permitted.
Note 6: The user should not assume compatibility of commands between different parts based on command names. Always refer to the manufacturer's
data sheet for each part for a complete definition of a command's function. Analog Devices, Inc., strives to keep command functionality compatible
between all Analog Devices, Inc's ICs. Differences may occur to address specific product requirements.
Table 8. Data Format Abbreviations
L11 Linear_5s_11s PMBus data field b[15:0]
Value = Y • 2
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
From "PMBus Spec Part II: Paragraph 7.1"
L16 Linear_16u PMBus data field b[15:0]
Value = Y • 2
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
Reg Register 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)
CF 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.
54
Sets the offset of the external temperature
sensor with respect to –273.1°C
Common address for PolyPhase outputs
to adjust common parameters.
48-bit share-clock counter value.
power down.
N
–13 –6
= 854 • 10
N
–12
= 4.75 From "PMBus Spec Part II: Paragraph 8.2"
For more information
DATA
TYPE PAGED FORMAT UNITS NVM
R/W Word Y L11
R/W Byte Y Reg
R Block N CF
Send Byte N
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DEFAULT
VALUE PAGE
C Y 0.0 98
0x8000
Y 0x80 85
NA 124
NA 87
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