Linear Technology LTC2977 Demo Board: Octal Power Supply Manager [Requires DC1613] DC2028A DC2028A Data Sheet
Product codes
DC2028A
LTC2977
69
2977fa
MFR_FAULT_LOG
Read only. This 2040-bit (255 byte) data block contains a copy of the RAM buffer fault log. The RAM buffer is continuously
Read only. This 2040-bit (255 byte) 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_all_fault_log_enable = 1 and Mfr_fault_log_status_eeprom = 0, the RAM buffer is transferred to
With Mfr_config_all_fault_log_enable = 1 and Mfr_fault_log_status_eeprom = 0, the RAM buffer is transferred to
EEPROM whenever an LTC2977 fault causes a channel to latch off or a MFR_FAULT_LOG_STORE command is received.
This transfer is delayed until the ADC has updated its READ values for all channels when Mfr_config_all_fast_fault_log
is clear, otherwise it happens within 24ms. This optional delay can be used to ensure that the slower, ADC monitored,
values are all updated for the case where a fast supervisor detected fault initiates the transfer to EEPROM.
Mfr_fault_log_status_eeprom is set high after the RAM buffer is transferred to EEPROM and not cleared until a
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 LTC2977 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
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_longer_pmbus_timeout be set to 1.
pMbus coMManD DescripTion