Instruction Manual

MAX15303 PMBus Command Set User’s Guide
Page 35 of 52
Device Identification Commands
CAPABILITY
Reference:
Standard Command
Lockable:
N/A
Command Code:
0x19
Format:
Bit field
Data Bytes:
1
Units:
N/A
Transfer:
Read Byte
Factory Value:
0xA0
Description/Notes:
See Section 11.12 of the PMBus Specification Part II.
PMBUS_REVISION
Reference:
Standard Command
Lockable:
N/A
Command Code:
0x98
Format:
Bit field
Data Bytes:
1
Units:
N/A
Transfer:
Read Byte
Factory Value:
0x22 (see Description)
Description/Notes:
See Section 22.1 of the PMBus Specification Part II.
Note that due to a typographical error in the PMBus Specification version 1.2, wherein bit #4 is
omitted from the PMBUS_REVISION data byte, the Maxim interpretation is to correct this error and
include bit #4, placing the Part I Revision level in bits [7:4] and the Part II Revision level in bits [3:0].
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Bits [7:4] describe the PMBus specification Part I revision level as follows:
0000 Revision 1.0
0001 Revision 1.1
0010 Revision 1.2
Bits [3:0] describe the PMBus specification Part II revision level as follows:
0000 Revision 1.0
0001 Revision 1.1
0010 Revision 1.2
MFR_ID
Reference:
Standard Command
Lockable:
Yes
Command Code:
0x99
Format:
ASCII string
Data Bytes:
8
Units:
N/A
Transfer:
Read/Write Block
Factory Value:
String of 6 spaces (ASCII 0x20)
Description/Notes:
See Section 22.2.1 of the PMBus Specification Part II.
Note that the MAX15303 implements MFR_ID as a fixed-width string, not as part of a shared memory
space.
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See the PMBus Specification, Part II, draft version 1.3, where this error is corrected to agree with the interpretation
described here.