Datasheet

LTC2977
70
2977fa
For more information www.linear.com/LTC2977
Table 2. Data Block Contents
DATA BYTE* DESCRIPTION
Position_last[7:0] 0 Position of fault log pointer
when fault occurred.
Cyclic_data_valid_count[7:0] 1 Number of valid bytes of cyclic
data. 0xFF indicates all cyclic
data is valid.
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 LTC2977 is reset
SharedTime[15:8] 3
SharedTime[23:16] 4
SharedTime[31:24] 5
SharedTime[39:32] 6
SharedTime[40] 7
Mfr_vout_peak0[7:0] 8
Mfr_vout_peak0[15:8] 9
Mfr_vout_min0[7:0] 10
Mfr_vout_min0[15:8] 11
Mfr_vout_peak1[7:0] 12
Mfr_vout_peak1[15:8] 13
Mfr_vout_min1[7:0] 14
Mfr_vout_min1[15:8] 15
Mfr_vin_peak[7:0] 16
Mfr_vin_peak[15:8] 17
Mfr_vin_min[7:0] 18
Mfr_vin_min[15:8] 19
Mfr_vout_peak2[7:0] 20
Mfr_vout_peak2[15:8] 21
Mfr_vout_min2[7:0] 22
Mfr_vout_min2[15:8] 23
Mfr_vout_peak3[7:0] 24
Mfr_vout_peak3[15:8] 25
Mfr_vout_min3[7:0] 26
Mfr_vout_min3[15:8] 27
Mfr_temp_peak[7:0] 28
Mfr_temp_peak[15:8] 29
Mfr_ temp_min[7:0] 30
Mfr_ temp_min[15:8] 31
Mfr_vout_peak4[7:0] 32
Mfr_vout_peak4[15:8] 33
Mfr_vout_min4[7:0] 34
Mfr_vout_min4[15:8] 35
Mfr_vout_peak5[7:0] 36
Mfr_vout_peak5[15:8] 37
Mfr_vout_min5[7:0] 38
Mfr_vout_min5[15:8] 39
Table 2. Data Block Contents
DATA BYTE* DESCRIPTION
Mfr_vout_peak6[7:0] 40
Mfr_vout_peak6[15:8] 41
Mfr_vout_min6[7:0] 42
Mfr_vout_min6[15:8] 43
Mfr_vout_peak7[7:0] 44
Mfr_vout_peak7[15:8] 45
Mfr_vout_min7[7:0] 46
Mfr_vout_min7[15:8] 47
Status_vout0 48
Status_mfr0 49
Mfr_status_2_0[7:0] 50 Reserved bits[15:8] not stored
Status_vout1 51
Status_mfr1 52
Mfr_status_2_1[7:0] 53
Status_vout2 54
Status_mfr2 55
Mfr_status_2_2[7:0] 56
Status_vout3 57
Status_mfr3 58
Mfr_status_2_3[7:0] 59
Status_vout4 60
Status_mfr4 61
Mfr_status_2_4[7:0] 62
Status_vout5 63
Status_mfr5 64
Mfr_status_2_5[7:0] 65
Status_vout6 66
Status_mfr6 67
Mfr_status_2_6[7:0] 68
Status_vout7 69
Status_mfr7 70
Mfr_status_2_7[7:0] 71
72 bytes for preamble
Fault_log [Position_last] 72 Start of cyclic data
Fault_log 73
.
.
.
Fault_log 237 Last Valid Byte
Reserved 238-254
Number of cyclic data loops: (238-72)/46 = 3.6
*Note: 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