Texas Instruments TMS320C6745 DSP - 14.2.8 Trip-Zone (TZ) Submodule; Trip-Zone 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
EPWMxA
EPWMxB
TZ1
to TZn
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
Interrupt
controller
Interrupt
controller
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SPRUH91D–March 2013–Revised September 2016
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Enhanced High-Resolution Pulse-Width Modulator (eHRPWM)
14.2.8 Trip-Zone (TZ) Submodule
Figure 14-36 shows how the trip-zone (TZ) submodule fits within the ePWM module. Each ePWM module
is connected to every TZ signal that are sourced from the GPIO MUX. These signals indicates external
fault or trip conditions, and the ePWM outputs can be programmed to respond accordingly when faults
occur. See your device-specific data manual to determine the number of trip-zone pins available for the
device.
Figure 14-36. Trip-Zone Submodule
14.2.8.1 Purpose of the Trip-Zone Submodule
The key functions of the trip-zone submodule are:
• Trip inputs TZ1 to TZn can be flexibly mapped to any ePWM module.
• Upon a fault condition, outputs EPWMxA and EPWMxB can be forced to one of the following:
– High
– Low
– High-impedance
– No action taken
• Support for one-shot trip (OSHT) for major short circuits or over-current conditions.
• Support for cycle-by-cycle tripping (CBC) for current limiting operation.
• Each trip-zone input pin can be allocated to either one-shot or cycle-by-cycle operation.
• Interrupt generation is possible on any trip-zone pin.
• Software-forced tripping is also supported.
• The trip-zone submodule can be fully bypassed if it is not required.