Datasheet

LTC2974
64
2974fc
For more information www.linear.com/LTC2974
STATUS_CML
The STATUS_CML command returns the summary of the communication, memory and logic faults or warnings which
have occurred, as shown in the following table:
STATUS_CML Data Contents
BIT(S) SYMBOL OPERATION
b[7] Status_cml_cmd_fault 1 = An illegal or unsupported command fault has occurred.
0 = No fault has occurred.
b[6] Status_cml_data_fault 1 = Illegal or unsupported data received.
0 = No fault has occurred.
b[5] Status_cml_pec_fault 1 = A packet error check fault has occurred. Note: PEC checking is always active in the LTC2974. Any extra byte
received before a STOP will set Status_cml_pec_fault unless the extra byte is a matching PEC byte.
0 = No fault has occurred.
b[4] Status_cml_memory_fault 1 = A fault has occurred in the EEPROM.
0 = No fault has occurred.
b[3] Status_cml_processor_fault Not supported, always returns 0.
b[2] Reserved Reserved, always returns 0.
b[1] Status_cml_pmbus_fault 1 = A communication fault other than ones listed in this table has occurred. This is a catch all category for illegally
formed I
2
C/SMBus commands (Example: An address byte with read =1 received immediately after a START).
0 = No fault has occurred.
b[0] Status_cml_unknown_fault Not supported, always returns 0.
STATUS_MFR_SPECIFIC
The STATUS_MFR_SPECIFIC command returns manufacturer specific status flags. Bits marked CHANNEL = All are
not paged. Bits marked STICKY = Yes stay set until a CLEAR_FAULTS is issued or the channel is commanded on by
the user. Bits marked ALERT = Yes pull ALERTB low when the bit is set. Bits marked OFF = Yes indicate that the event
can be configured elsewhere to turn the channel off.
STATUS_MFR_SPECIFIC Data Contents
BIT(S) SYMBOL OPERATION CHANNEL STICKY ALERT OFF
b[7] Status_mfr_discharge 1 = A V
OUT
discharge fault occurred while attempting to enter the ON
state.
0 = No V
OUT
discharge fault has occurred.
Current Page
Yes Yes Yes
b[6] Status_mfr_fault1_in This channel attempted to turn on while the FAULTB1 pin was
asserted low, or this channel has shut down at least once in
response to a FAULTB1 pin asserting low since the last CONTROL
pin toggle, OPERATION command ON/OFF cycle or CLEAR_FAULTS
command. If Mfr_track_en_chann is set, Status_mfr_fault1_in may
also be set for the channel causing the fault.
Current Page
Yes Yes Yes
b[5] Status_mfr_fault0_in This channel attempted to turn on while the FAULTB0 pin was
asserted low, or this channel has shut down at least once in
response to a FAULTB0 pin asserting low since the last CONTROL
pin toggle, OPERATION command ON/OFF cycle or CLEAR_FAULTS
command. If Mfr_track_en_chann is set, Status_mfr_fault0_in may
also be set for the channel causing the fault.
Current Page
Yes Yes Yes
b[4] Status_mfr_servo_target_reached Servo target has been reached. Current Page
No No No
b[3] Status_mfr_dac_connected DAC is connected and driving V
DAC
pin. Current Page No No No
pMbus coMManD DescripTion