Datasheet

LTC2974
54
2974fc
For more information www.linear.com/LTC2974
pMbus coMManD DescripTion
Clearing Latched Faults
Latched faults are reset by toggling the CONTROL pin, using the OPERATION command, or removing and reapplying
the bias voltage to the V
IN_SNS
pin. All fault and warning conditions result in the ALERTB pin being asserted low and
the corresponding bits being set in the status registers. The CLEAR_FAULTS command resets the contents of the
status registers and de-asserts the ALERTB output. The CLEAR_FAULTS does not clear a faulted off state nor allow a
channel to turn back on.
FAULT RESPONSES
COMMAND NAME
CMD
CODE DESCRIPTION TYPE PAGED FORMAT UNITS EEPROM
DEFAULT
VALUE
REF
PAGE
VOUT_OV_FAULT_RESPONSE 0x41 Action to be taken by the device when an
output overvoltage fault is detected.
R/W Byte Y Reg Y 0x80
55
VOUT_UV_FAULT_RESPONSE 0x45 Action to be taken by the device when an
output undervoltage fault is detected.
R/W Byte Y Reg Y 0x7F
55
IOUT_OC_FAULT_RESPONSE 0x47 Action to be taken by the device when an
output overcurrent fault is detected.
R/W Byte Y Reg Y 0x00
56
IOUT_UC_FAULT_RESPONSE 0x4C Action to be taken by the device when an
output undercurrent fault is detected.
R/W Byte Y Reg Y 0x00
56
OT_FAULT_RESPONSE 0x50 Action to be taken by the device when an
overtemperature fault is detected on the
external temperature sensor.
R/W Byte Y Reg Y 0xB8
57
UT_FAULT_RESPONSE 0x54 Action to be taken by the device when an
undertemperature fault is detected on the
external temperature sensor.
R/W Byte Y Reg Y 0xB8
57
VIN_OV_FAULT_RESPONSE 0x56 Action to be taken by the device when an
input overvoltage fault is detected.
R/W Byte N Reg Y 0x80
57
VIN_UV_FAULT_RESPONSE 0x5A Action to be taken by the device when an
input undervoltage fault is detected.
R/W Byte N Reg Y 0x00
57
TON_MAX_FAULT_RESPONSE 0x63 Action to be taken by the device when a
TON_MAX_FAULT event is detected.
R/W Byte Y Reg Y 0xB8
58
MFR_RETRY_DELAY 0xDB Retry interval during FAULT retry mode. R/W Word N L11 ms Y 200
0xF320
58
MFR_RETRY_COUNT 0xF7 Retry count for all faulted off conditions
that enable retry.
R/W Byte N Reg Y 0x00
58