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2.7Trip-Zone(TZ)Submodule
CTR = CMPB
CTR = CMPA
CTR_Dir
CTR = 0
CTR = PRD
Dead
Band
(DB)
Counter
Compare
(CC)
Action
Qualifier
(AQ)
EPWMxA
EPWMxB
CTR = CMPB
CTR = 0
EPWMxINT
EPWMxSOCA
EPWMxSOCB
EPWMxA
EPWMxB
TZ1
to TZ6
CTR = CMPA
Time-Base
(TB)
CTR = PRD
CTR = 0
CTR_Dir
EPWMxSYNCI
EPWMxSYNCO
EPWMxTZINT
PWM-
chopper
(PC)
Event
Trigger
and
Interrupt
(ET)
Trip
Zone
(TZ)
GPIO
MUX
ADC
PIE
PIE
2.7.1PurposeoftheTrip-ZoneSubmodule
Trip-Zone(TZ)Submodule
Figure2-35showshowthetrip-zone(TZ)submodulefitswithintheePWMmodule.
Figure2-35.Trip-ZoneSubmodule
EachePWMmoduleisconnectedtosixTZnsignals(TZ1toTZ6)thataresourcedfromtheGPIOMUX.
Thesesignalsindicateexternalfaultortripconditions,andtheePWMoutputscanbeprogrammedto
respondaccordinglywhenfaultsoccur.
ThekeyfunctionsoftheTrip-Zonesubmoduleare:
•TripinputsTZ1toTZ6canbeflexiblymappedtoanyePWMmodule.
•Uponafaultcondition,outputsEPWMxAandEPWMxBcanbeforcedtooneofthefollowing:
–High
–Low
–High-impedance
–Noactiontaken
•Supportforone-shottrip(OSHT)formajorshortcircuitsorover-currentconditions.
•Supportforcycle-by-cycletripping(CBC)forcurrentlimitingoperation.
•Eachtrip-zoneinputpincanbeallocatedtoeitherone-shotorcycle-by-cycleoperation.
•Interruptgenerationispossibleonanytrip-zonepin.
•Software-forcedtrippingisalsosupported.
•Thetrip-zonesubmodulecanbefullybypassedifitisnotrequired.
SPRU791D–November2004–RevisedOctober2007ePWMSubmodules59
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