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LTM4700
PMBus COMMAND DETAILS
Table 19. FAULTn Propagate Fault Configuration
The FAULT0 and FAULT1 pins are designed to provide electrical notification of selected events to the user. Some of these events are common to both output
channels. Others are specific to an output channel. They can also be used to share faults between channels.
BIT(S)
SYMBOL
B[15]
VOUT disabled while not decayed.
B[14]
Mfr_fault_propagate_short_CMD_cycle
b[13]
Mfr_fault_propagate_ton_max_fault
b[12]
Reserved
b[11]
Mfr_fault0_propagate_int_ot,
Mfr_fault1_propagate_int_ot
b[10]
Reserved
b[9]
Reserved
b[8]
Mfr_fault0_propagate_ut,
Mfr_fault1_propagate_ut
b[7]
Mfr_fault0_propagate_ot,
Mfr_fault1_propagate_ot
b[6]
Reserved
b[5]
Reserved
b[4]
Mfr_fault0_propagate_input_ov,
Mfr_fault1_propagate_input_ov
b[3]
Reserved
b[2]
Mfr_fault0_propagate_iout_oc,
Mfr_fault1_propagate_iout_oc
b[1]
Mfr_fault0_propagate_vout_uv,
Mfr_fault1_propagate_vout_uv
b[0]
Mfr_fault0_propagate_vout_ov,
Mfr_fault1_propagate_vout_ov
102
OPERATION
This is used in a PolyPhase configuration when bit 0 of the MFR_CHAN_CONFIG_LTM4700 is a
zero. If the channel is turned off, by toggling the RUN pin or commanding the part OFF , and then
the RUN is reasserted or the part is commanded back on before the output has decayed, VOUT
will not restart until the 12.5% decay is honored. The FAULT pin is asserted during this condition
if bit 15 is asserted.
0: No action
1: Asserts low if commanded off then on before the output has sequenced off. Re-asserts high
t
after sequence off.
OFF(MIN)
0: No action if a TON_MAX_FAULT fault is asserted
1: Associated output will be asserted low if a TON_MAX_FAULT fault is asserted
FAULT0 is associated with page 0 TON_MAX_FAULT faults
FAULT1 is associated with page 1 TON_MAX_FAULT faults
0: No action if the MFR_OT_FAULT_LIMIT fault is asserted
1: Associated output will be asserted low if the MFR_OT_FAULT_LIMIT fault is asserted
0: No action if the UT_FAULT_LIMIT fault is asserted
1: Associated output will be asserted low if the UT_FAULT_LIMIT fault is asserted
FAULT0 is associated with page 0 UT faults
FAULT1 is associated with page 1 UT faults
0: No action if the OT_FAULT_LIMIT fault is asserted
1: Associated output will be asserted low if the OT_FAULT_LIMIT fault is asserted
FAULT0 is associated with page 0 OT faults
FAULT1 is associated with page 1 OT faults
0: No action if the VIN_OV_FAULT_LIMIT fault is asserted
1: Associated output will be asserted low if the VIN_OV_FAULT_LIMIT fault is asserted
0: No action if the IOUT_OC_FAULT_LIMIT fault is asserted
1: Associated output will be asserted low if the IOUT_OC_FAULT_LIMIT fault is asserted
FAULT0 is associated with page 0 OC faults
FAULT1 is associated with page 1 OC faults
0: No action if the VOUT_UV_FAULT_LIMIT fault is asserted
1: Associated output will be asserted low if the VOUT_UV_FAULT_LIMIT fault is asserted
FAULT0 is associated with page 0 UV faults
FAULT1 is associated with page 1 UV faults
0: No action if the VOUT_OV_FAULT_LIMIT fault is asserted
1: Associated output will be asserted low if the VOUT_OV_FAULT_LIMIT fault is asserted
FAULT0 is associated with page 0 OV faults
FAULT1 is associated with page 1 OV faults
For more information
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Rev. B
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