ltc2978 Linear Technology Corporation, ltc2978 Datasheet - Page 46

• Manufacturer Part Number: ltc2978
• Description: Octal Pmbus Power Supply Monitor And Controller With Eeprom
• Manufacturer: Linear Technology Corporation

MFR_FAULT_LOG
Read only. This 2048-bit data block contains a copy of
the RAM buffer fault log. The RAM buffer is continuously
updated after each ADC conversion as long as Mfr_fault_
log_status_ram is clear. With Mfr_config_fault_log_en = 1
and Mfr_fault_log_status_eeprom = 0, the RAM buffer is
transferred to EEPROM whenever an LTC2978 fault causes
a channel to latch off or a MFR_FAULT_LOG_STORE com-
mand is received. Mfr_fault_log_status_eeprom is set
high after the RAM buffer is transferred to EEPROM and
not cleared until a Mfr_fault_log_clear is received; even if
the LTC2978 is reset or powered down. Fault log EEPROM
transfers are not initiated as a result of Status_mfr_dis-
charge, Status_mfr_fault1_in or Status_mfr_fault0_in
events. During a Mfr_fault_log read, data is returned one
byte at a time as defined by the following table. The fault
log stores approximately 1 to 2 seconds of telemetry.
MFR_FAULT_LOG Data Block Contents
LTC2978
operaTion

DATA
Position_last[7:0]
SharedTime[7:0]
SharedTime[15:8]
SharedTime[23:16]
SharedTime[31:24]
SharedTime[39:32]
SharedTime[40]
Mfr_vout_peak0[7:0]
Mfr_vout_peak0[15:8]
Mfr_vout_min0[7:0]
Mfr_vout_min0[15:8]
Mfr_vout_peak1[7:0]
Mfr_vout_peak1[15:8]
Mfr_vout_min1[7:0]
Mfr_vout_min1[15:8]
Mfr_vin_peak[7:0]
Mfr_vin_peak[15:8]
Mfr_vin_min[7:0]
BYTE
10
11
12
13
14
15
16
17
0
1
2
3
4
5
6
7
8
9
BLOCK READ COMMAND
Position of fault log pointer
when fault occurred.
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 LTC2978 is reset
MFR_FAULT_LOG Data Block Contents
DATA
Mfr_vin_min[15:8]
Mfr_vout_peak2[7:0]
Mfr_vout_peak2[15:8]
Mfr_vout_min2[7:0]
Mfr_vout_min2[15:8]
Mfr_vout_peak3[7:0]
Mfr_vout_peak3[15:8]
Mfr_vout_min3[7:0]
Mfr_vout_min3[15:8]
Mfr_temp_peak[7:0]
Mfr_temp_peak[15:8]
Mfr_ temp_min[7:0]
Mfr_ temp_min[15:8]
Mfr_vout_peak4[7:0]
Mfr_vout_peak4[15:8]
Mfr_vout_min4[7:0]
Mfr_vout_min4[15:8]
Mfr_vout_peak5[7:0]
Mfr_vout_peak5[15:8]
Mfr_vout_min5[7:0]
Mfr_vout_min5[15:8]
Mfr_vout_peak6[7:0]
Mfr_vout_peak6[15:8]
Mfr_vout_min6[7:0]
Mfr_vout_min6[15:8]
Mfr_vout_peak7[7:0]
Mfr_vout_peak7[15:8]
Mfr_vout_min7[7:0]
Mfr_vout_min7[15:8]
Fault_log [Position_last]
Fault_log [Position_last-1]
.
.
.
Fault_log [Position_last-201]
Reserved
248-255
BYTE
247
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
BLOCK READ COMMAND
47 bytes for preamble
Number of loops
(248-47)/40 = 5
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