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LTC4449 Datasheet(PDF) 29 Page - Linear Technology |
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LTC4449 Datasheet(HTML) 29 Page - Linear Technology |
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29 / 108 page  LTC3882-1 29 Rev A For more information www.analog.com OPERATION Table 1. LTC3882-1 Fault Log Contents RECORD TYPE STARTING BYTE ENDING BYTE COMMENTS Header Information 0 26 See Table 2. Fault Event Record 27 46 Fault may have occurred anywhere during this event record. See byte 4 of Table 2 and all of Table 3 and Table 4. Event Record N-1 47 66 Last complete cyclical data read before the fault was detected. Event Record N-2 67 86 Older data record. Event Record N-3 87 106 Event Record N-4 107 126 Event Record N-5 127 146 Oldest recorded data. Table 2. Fault Log Header Information RECORD BITS FORMAT BLOCK BYTE COUNT DETAILS Fault Log Preface [7:0] ASC 0 Returns LTxx beginning at byte 0 if a partial or complete fault log exists. Word xx is a factory identifier that may vary part to part. [7:0] 1 [15:8] Reg 2 [7:0] 3 Fault Source [7:0] Reg 4 Refer to Table 3. 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 MFR_IOUT_PEAK (PAGE 1) [15:8] L11 17 Peak READ_IOUT on Channel 1 since last power-on or CLEAR_PEAKS command. [7:0] 18 MFR_VIN_PEAK [15:8] L11 19 Peak READ_VIN since last power-on or CLEAR_PEAKS command. [7:0] 20 READ_TEMPERATURE1 (PAGE 0) [15:8] L11 21 External temperature sensor 0 during last event. [7:0] 22 READ_TEMPERATURE1 (PAGE 1) [15:8] L11 23 External temperature sensor 1 during last event. [7:0] 24 READ_TEMPERATURE2 [15:8] L11 25 Internal temperature sensor during last event. [7:0] 26 TheMFR_FAULT_LOGcommandusesablockreadprotocol with a fixed length of 147 bytes. The LTC3882-1 returns a block byte count of zero if a fault log is not present. Contents of a fault log are shown in Table 1 through Table 4. Refer to Table 6 for an explanation of data formats. Each event record represents one complete conversion cycle through all multiplexed monitor ADC inputs and related status. The six most recent event records are maintained in internal memory in reverse chronological order unless the part is reset. Then the four most recent events are maintained in EEPROM. When a fault log is created the present ADC input cycle is completed and the ADC input being converted at the time of the fault is noted in the log header record. |
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