In sectors such as smart homes, automotive electronics, and industrial control, capacitive touch technology has become the mainstream human-machine interface due to its advantages like no mechanical wear, sleek appearance, and flexible interaction. However, "water" remains an unavoidable challenge for capacitive touch technology—failed operation after washing hands, false triggers from falling water drops, unresponsiveness under liquid coverage. These pain points severely restrict the application of capacitive touch technology in humid environments.
I. Industry Pain Points: "Strikes Out" When Wet—Three Most Common Issues
Traditional capacitive detection chips face a core problem in humid, dripping, or liquid-covered scenarios: they "cannot distinguish between water drops/moisture and normal operation." Specific issues include:
1. Water drops cause false touches, leading to unintended device actions
Whether it's outdoor car door handles or smart door locks getting rained on, or water droplets from workshop moisture, traditional solutions mistake water drops for actual touches, resulting in random switch toggling, false screen wake-ups, and even unintended activation of industrial equipment—posing safety risks.
Figure 1: Water drop scenario demonstration
2. Inaccurate release detection, compromising both safety and user experience
In consumer electronics, smart control panels, industrial buttons, and similar scenarios, buttons need to accurately detect whether a finger has been released. But traditional solutions in humid environments either get misled by moisture into thinking there's still contact, or suffer from low sensitivity, causing sluggish or missed release detection—affecting normal device operation.
Figure 2: Release detection scenario demonstration
3. Complete failure under liquid coverage, unusable in complex conditions
Under extreme conditions where water fully covers the detection area, traditional solutions get blocked by the water layer, fail to sense human touch, and become completely unresponsive. Moreover, they struggle to adapt to different liquids such as water or oil, resulting either in inaccurate detection or requiring multiple chips to work together—increasing cost and device size.
Figure 3: Liquid coverage scenario demonstration
II. AWINIC's Next-Generation Waterproof Technology—Three Breakthroughs
1. Technical Architecture
The new-generation capacitive waterproof solution adopts a "hardware + algorithm" co-design approach, forming a complete technical loop from signal acquisition to final decision:
This complete system achieves three breakthroughs: no false touches from water drops, >99% wet-hand recognition rate, and >98% success rate under liquid coverage—thoroughly solving touch challenges in humid environments.
2. Three Breakthroughs
① No false touches from water drops
Figure 4: AWINIC water drop test solution
② Normal operation with wet hands
The AWINIC
Dayu® Waterproof 2.0 algorithm features upgraded multi-dimensional signal
extraction, capturing signal trend changes, amplitude variations, and other
information in real time for more accurate touch action recognition.
The built-in adaptive baseline adjustment algorithm responds quickly to
external environmental changes, greatly improving the success rate of wet-hand
touches.
Actual wet-hand click tests show a success rate of over 99%.
③ Normal recognition under liquid coverage
3. Recommended Typical Application Design
3/5/12 channels, high-sensitivity self-capacitance & mutual-capacitance touch
|
Parameter |
Value |
|
Capacitive resolution |
1aF |
|
Compensation capacitance |
220 pF |
|
Button actions |
Single tap, double tap, triple tap, long press (waterproof) |
|
Gestures |
1D slide, 2D slide, circular slide |
|
Wear detection |
Supported |
Low power consumption
|
Mode |
Current |
|
Active |
23.5 μA |
|
Doze |
10.7 μA |
|
Sleep |
8.9 μA |
Other specifications
III. AWINIC Capacitive Touch Chip Selection Guide
Table 1: AWINIC Capacitive Touch Chip Selection Guide
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