Question: Does the CY8C20xx7 device family support water tolerance applications?
Answer: Yes, the CY8C20xx7 device family supports shield electrodes on 5 ports pins. Each shield electrode can be enabled independently from other shield electrode. Maximum parasitic capacitance of shield electrode should be less than 100pF for a 3MHz sensor scan clock for the shield electrode to work perfectly. The shield electrode feature in CY8C20xx7 is ideal for implementing:
- Water tolerant buttons and sliders,
- Buttons and sliders in presence of metal objects and
- Proximity sensors.
Additionally, the shield electrode implementation also supports a shield-tank capacitor, which can be used to limit the bandwidth of shield electrode to lower radiated noise from shield electrode.
