LTC3883 Datasheet, PDF (103/112 Pages) Linear Technology – Single Phase Step-Down DC/DC Controller with Digital Power System Management

LTC3883/LTC3883-1
PMBus Command Details
Table 11. 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
DATA
BITS
Block Length
HEADER INFORMATION
Fault Position
MFR_REAL_TIME
[7:0]
[15:8]
[23:16]
[31:24]
[39:32]
[47:40]
MFR_VOUT_PEAK
[15:8]
[7:0]
Reserved
Reserved
MFR_IOUT_PEAK
[15:8]
[7:0]
MFR_READ_IIN_CHAN_PEAK
[15:8]
[7:0]
MFR_VIN_PEAK
[15:8]
[7:0]
READ_TEMPERATURE_1
[15:8]
[7:0]
Reserved
Reserved
READ_TEMPERATURE_2
[15:8]
[7:0]
MFR_TEMPERATURE_1_PEAK
[15:8]
[7:0]
Reserved
Reserved
CYCLICAL DATA
EVENT n
(Data at Which Fault Occurred; Most Recent Data)
READ_VOUT
Reserved
Reserved
READ_IOUT
[15:8]
[7:0]
[15:8]
[7:0]
DATA
FORMAT
BYTE
LIN 11 = PMBus = Rev 1.1, Part 2, section 7.1
LIN 16 = PMBus Rev 1.1, Part 2, section 8. Mantissa portion only
BYTE = 8 bits interpreted per definition of this command
BYTE NUM BLOCK READ COMMAND
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
BYTE
BYTE
BYTE
BYTE
BYTE
BYTE
BYTE
LIN 16
BYTE
BYTE
LIN 11
LIN 11
LIN 11
LIN 11
BYTE
BYTE
LIN 11
LIN 11
BYTE
BYTE
0
Indicates the fault that caused the fault log to be activated.
1
48 bit binary counter. The value is the time since the last reset in 200µs
2
increments.
3
4
5
6
7
Peak READ_VOUT since last MFR_CLEAR_PEAKS command.
8
9
10
11 Peak READ_IOUT since last MFR_CLEAR_PEAKS command.
12
13 Peak READ_IIN since last MFR_CLEAR_PEAKS command.
14
15 Peak READ_VIN since last MFR_CLEAR_PEAKS command.
16
17 External temperature during last event.
18
19 Always returns 0x00.
20 Always returns 0x00.
21 Internal temperature sensor during last event
22
23 Peak READ_TEMPERATURE_1 since last MFR_CLEAR_PEAKS
24 ^command.
25 Always returns 0x00.
26 Always returns 0x00.
LIN 16
BYTE
BYTE
LIN 11
Event “n” represents one complete cycle of ADC reads through the MUX
at time of fault. Example: If the fault occurs when the ADC is processing
step 15, it will continue to take readings through step 25 and then store
the header and all 6 event pages to EEPROM
27
28
29 Always returns 0x00.
30 Always returns 0x00.
31
32
3883f
103