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LTM2987 Datasheet(PDF) 83 Page - Analog Devices |
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LTM2987 Datasheet(HTML) 83 Page - Analog Devices |
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83 / 114 page  LTC2971 83 Rev. 0 For more information www.analog.com During a Mfr_fault_log read, data is returned one byte at a time as defined in Table 4. The fault log data is parti- tioned into two sections. The first section is referred to as the preamble and contains the Position_last pointer, time information and peak and min values. The second section contains a chronological record of telemetry and requires Position_last for proper interpretation. The fault log stores approximately 300ms seconds of telemetry. To prevent timeouts during block reads, it is recommended that Mfr_config_all_longer_pmbus_timeout be set to 1. Table 4. Data Block Contents DATA BYTE* DESCRIPTION Position_last[7:0] 0 Position of fault log pointer when fault occurred. Reserved 1 Always returns 0x00. SharedTime[7:0] 2 41-bit share-clock counter value when fault occurred. Counter LSB is in 200μs increments. This counter is cleared at power- up or after the LTC2971 is reset. SharedTime[15:8] 3 SharedTime[23:16] 4 SharedTime[31:24] 5 SharedTime[39:32] 6 SharedTime[40] 7 Mfr_first_fault[7:0] 8 Mfr_first_fault[15:8] 9 FirstFaultTime 10 Least significant 8 bits of the share-clock counter captured at the time the first fault is detected. Mfr_vout_peak0[7:0] 11 Mfr_vout_peak0[15:8] 12 Mfr_vout_min0[7:0] 13 Mfr_vout_min0[15:8] 14 Mfr_temperature_peak0[7:0] 15 Mfr_temperature_peak0[15:8] 16 Mfr_temperature_min0[7:0] 17 Mfr_temperature_min0[15:8] 18 Mfr_iout_peak0[7:0] 19 Mfr_iout_peak0[15:8] 20 Mfr_iout_min0[7:0] 21 Mfr_iout_min0[15:8] 22 Mfr_vin_peak[7:0] 23 Mfr_vin_peak[15:8] 24 Mfr_vin_min[7:0] 25 Table 4. Data Block Contents DATA BYTE* DESCRIPTION Mfr_vin_min[15:8] 26 Mfr_iin_peak[7:0] 27 Mfr_iin_peak[15:8] 28 Mfr_iin_min[7:0] 29 Mfr_iin_min[15:8] 30 Mfr_pin_peak[7:0] 31 Mfr_pin_peak[15:8] 32 Mfr_pin_min[7:0] 33 Mfr_pin_min[15:8] 34 Mfr_vout_peak1[7:0] 35 Mfr_vout_peak1[15:8] 36 Mfr_vout_min1[7:0] 37 Mfr_vout_min1[15:8] 38 Mfr_temperature_peak1[7:0] 39 Mfr_temperature_peak1[15:8] 40 Mfr_temperature_min1[7:0] 41 Mfr_temperature_min1[15:8] 42 Mfr_iout_peak1[7:0] 43 Mfr_iout_peak1[15:8] 44 Mfr_iout_min1[7:0] 45 Mfr_iout_min1[15:8] 46 Status_vout0[7:0] 47 Status_iout0[7:0] 48 Status_mfr_specific0[7:0] 49 Mfr_status_2_0[7:0] 50 Reserved bits[15:8] not stored Status_vout1[7:0] 51 Status_iout1[7:0] 52 Status_mfr_specific1[7:0] 53 Mfr_status_2_1[7:0] 54 55 bytes for preamble Fault_log [Position_last] 55 Fault_log [Position_last-1] 56 ... Fault_log [Position_last-170] 237 Reserved 238- 254 Number of loops: (238 – 55)/36 = 5.08 *Note that PMBus data byte numbers start at 1 rather than 0. Position_last is the first byte returned after BYTE_COUNT = 0xFF. See block read protocol. PMBus COMMAND DESCRIPTION |
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