Datasheet

LTC2974
34
2974fc
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pMbus coMManD DescripTion
Figure 16. Cascade Sequence ON with Time Based Sequence Down on FAULT0
be used to turn all cascade channels off then on to clear the faulted off state when the slave’s control pin is low. For
this reason we refer to the control pin as being redefined as a sequence pin.
The waveform of Figure 16 illustrates cascade sequence ON and time based sequence OFF using the configuration
illustrated in Figure 15. In this example the FAULTB0 pin is used as a broadcast off signal. Turning the system off with
the FAULTB0 requires all slave channels to be configured with Mfr_faultb0_response_chann asserted high. After the
system is turned off, the LTC2974 will assert ALERTB with all slave channels indicating a Status_mfr_fault0_in event.
V
OUT2
V
OUT3
POWERGOOD3
2974 F16
POWERGOOD2
POWERGOOD1
POWERGOOD0
CONTROL-FAULTB0
V
OUT1
V
OUT0
TOFF_DELAY3
TOFF_DELAY2
TOFF_DELAY1
TOFF_DELAY0