1 of 1 people found this helpful
The Voltage Fault Detector uses the internal VDAC to define the OV and UV threshold. If you are powering PSoC at 3.3V the maximum voltage you can drive the internal VDAC is around 85% of VDDA.
That's why you can't monitor the 3.3V input directly (assuming you are powering PSoC at 3.3V). There are two ways to solve this:
- Increase the VDDA to 5V
- Use a circuit divider to drop 3.3V below of 85% of 3.3V
thanks for the answer ,
if so why is the powerMonitor block is working fine ?
2 of 2 people found this helpful
The Power Monitor component does not use the VDAC. It uses the ADC to scan the voltages. Therefore, it will not present the problem you described.