3.6 ZCD - Zero-Cross Detector
The Zero-Cross Detector (ZCD) detects when an alternating voltage crosses through a
threshold voltage near the ground potential. The ZCD can be used when monitoring an
alternating waveform for, but not limited to, the following purposes:
- Period Measurement
- Accurate Long-Term Time Measurement
- Dimmer Phase-Delayed Drive
- Low-EMI Cycle Switching
To detect zero-crossing, it requires only a current limiting resistor in series (RSERIES), thus simplifying the design.
Note: For code examples and details about
using the ZCD peripheral, refer to TB3233 - Using ZCD to Implement Special
Functions.