* 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.