LTC2978CUP View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2978CUP' PDF : 64 Pages View PDF
LTC2978
PMBus Command Description
MFR_FAULT_LOG
Read only. This 2040-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_enable = 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
command 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_discharge events. During a MFR_FAULT_LOG read,
data is returned as defined by the following table. The fault
log data is partitioned into two sections. The first section
is referred to as the preamble and contains the Position-
last pointer, time information and peak and minimum
values. The second section contains a chronological
record of telemetry and requires Position-last for proper
interpretation. The fault log stores approximately 0.5
seconds of telemetry. To prevent timeouts during block
reads, it is recommended that MFR_CONFIG_ALL_LTC2978
b[1] be set to 1.
Table 2. Data Block Contents
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]
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]
BYTE*
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
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
DESCRIPTION
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
56
For more information www.linear.com/LTC2978
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