LTM4676A_15 Datasheet, PDF (123/130 Pages) Linear Technology – Dual 13A or Single 26A Module Regulator with Digital Power System Management

LTM4676A
Appendix C: PMBus Command Details
NOTE: The approximate transfer time for this command is 3.4ms using a 400kHz clock.
This read-only command is in block format.
MFR_FAULT_LOG_STORE
The MFR_FAULT_LOG_STORE command forces the fault log operation to be written to EEPROM just as if a fault
event occurred. This command will generate a MFR_SPECIFIC fault if the “Enable Fault Logging” bit is set in the MFR_
CONFIG_ALL command.
If the die temperature exceeds 130°C, the MFR_FAULT_LOG_STORE command is disabled until the IC temperature
drops below 125°C.
Up-Time Counter is in the Fault Log header. The counter is the time since the last module reset (MFR_RESET,
RESTORE_USER_ALL, or SV_IN - power cycle) in 200µs increments. This is a 48-bit binary counter.
This write-only command has no data bytes.
Table 30. Fault Logging. This table outlines the format of the block data from a read block data of the MFR_FAULT_LOG command.
Data Format Definitions
LIN 11 = PMBus = Rev 1.2, Part 2, section 7.1
LIN 16 = PMBus Rev 1.2, Part 2, section 8. Mantissa portion only
BYTE = 8 bits interpreted per definition of this command
DATA
DATA
BITS FORMAT BYTE NUM BLOCK READ COMMAND
Block Length
BYTE
147 The MFR_FAULT_LOG command is a fixed length of 147 bytes
The block length will be zero if a data log event has not been captured
HEADER INFORMATION
Fault Log Preface
[7:0]
ASC
[7:0]
0
Returns LTxx beginning at byte 0 if a partial or complete fault log exists.
1
Word xx is a factory identifier that may vary part to part.
[15:8]
Reg
2
[7:0]
3
Fault Source
[7:0]
Reg
4
Refer to Table 31.
MFR_REAL_TIME
[7:0]
Reg
5
48 bit share-clock counter value when fault occurred (200µs resolution).
[15:8]
6
[23:16]
7
[31:24]
8
[39:32]
9
[47:40]
10
MFR_VOUT_PEAK (PAGE 0)
[15:8]
L16
11 Peak READ_VOUT on Channel 0 since last power-on or CLEAR_PEAKS
command.
[7:0]
12
MFR_VOUT_PEAK (PAGE 1)
[15:8]
L16
13 Peak READ_VOUT on Channel 1 since last power-on or CLEAR_PEAKS
command.
[7:0]
14
MFR_IOUT_PEAK (PAGE 0)
[15:8]
L11
15 Peak READ_IOUT on Channel 0 since last power-on or CLEAR_PEAKS
command.
[7:0]
16
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