* Question
What is the main function of the Trigger Zone (TZ) module?
* Answer
The Trigger Zone (TZ) module is a safety and protection feature found in many microcontrollers and digital signal controllers (especially TI C2000 family). Its main function is to provide fast hardware-based response to fault or protection events, ensuring safe system operation.
Main Function
The TZ module monitors external or internal signals (called “trip/trigger inputs”) and immediately forces outputs of the PWM (Pulse Width Modulator) or other control logic into a predefined safe state whenever a fault condition occurs.
Key Capabilities
Fault Detection & Handling
Detects overcurrent, overvoltage, undervoltage, or other fault signals from comparators, protection ICs, or sensors.
Input can come from external GPIO pins or on-chip analog comparators.
Immediate PWM Override
Shuts down or reconfigures PWM outputs within a few clock cycles.
Ensures motors, power converters, or inverters are protected from damage.
Configurable Response
Can force outputs to logic high, low, or high-impedance (Hi-Z).
Supports cycle-by-cycle trips (temporary disable per switching cycle) or one-shot trips (latched until software clears the fault).
Integration with Control Peripherals
Works tightly with ePWM (enhanced PWM) modules.
Can trigger interrupts so the CPU/firmware can log and process the fault.
Example Applications
Motor drives: Stops PWM immediately on overcurrent to prevent motor winding damage.
Power inverters & converters: Shuts down switching when an overvoltage/undervoltage is detected.
Automotive systems: Provides hardware failsafe if control logic misbehaves.
In summary:
The Trigger Zone (TZ) module’s main function is to act as a fast, hardware-level fault handler that instantly forces system outputs (typically PWMs) into a safe predefined state, protecting power electronics, motors, and other critical loads from damage.
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