TTP223B Digital Capacitive Touch Sensor Module – Momentary Touch Switch for Arduino, ESP32, and Hidden Interface Design

Product Description The TTP223B is a highly reliable digital capacitive touch sensor module designed to replace traditional mechanical buttons and switches. Based on the dedicated TTP223 touch-detection IC, this module triggers a digital output signal whenever a human finger or a conductive object comes near the sensing area. Its unique capacitive technology allows it to detect touch through thin layers of non-metallic materials like glass, plastic, or wood, making it the perfect choice for creating hidden waterproof interfaces or sleek control panels. Compatible with a wide voltage range, it integrates seamlessly with Arduino, ESP32, and Raspberry Pi for modern home automation and industrial UI projects.

Key Features

• Contactless Operation: Detects touch through non-metallic surfaces, protecting the electronics from dust, moisture, and wear.

• Low Power Consumption: Features an ultra-low operating current of 1.5uA, making it ideal for battery-operated IoT devices.

• Momentary Default State: Functions as a momentary switch (On while touched) but can be reconfigured for toggle or active-low modes.

• Fast Response Time: Boasts a rapid 60ms response speed in high-speed mode, ensuring instant user feedback.

• Integrated Auto-Calibration: Automatically recalibrates the sensing threshold to adapt to environmental changes in temperature or humidity.

Technical Details

• Dedicated Touch IC: Features the TTP223-BA6 specialized integrated circuit for high-stability capacitive sensing.

• Operating Voltage Range: Highly versatile operation from 2.0V DC to 5.5V DC, supporting both 3.3V and 5V systems.

• Internal Voltage Regulator: Built-in LDO ensures stable sensing performance even if the input power supply fluctuates slightly.

• Configurable Jumpers: Features solder pads (A and B) on the PCB to toggle between Active High/Low and Momentary/Self-locking modes.

• Signal Polarity: Default output is Active High; when the sensor is touched, the SIG pin outputs a voltage equal to VCC.

• Sensing Distance: Optimized for direct touch but can penetrate 0mm to 3mm of non-conductive overlays.

• Output Drive Capability: The digital signal pin can drive small loads or logic-level MOSFETs directly.

• Low Quiescent Current: In low-power mode, the current consumption is negligible, significantly extending battery life.

• Internal Filtering: Features high-frequency noise rejection to prevent false triggers from nearby cellular or WiFi signals.

• PCB Construction: Industrial-grade FR-4 glass-epoxy board with clear labeling for VCC, GND, and Signal (SIG) pins.

• Mounting Holes: Includes four M2 mounting holes for secure mechanical attachment to enclosures or panels.

• Dielectric Support: Works effectively behind acrylic, glass, wood, and plastic without physical contact.

• Stable Oscillator: Integrated internal timing reference removes the need for external crystals.

• Logic Level Compatibility: Direct TTL output is compatible with standard CMOS logic and all major development boards.

• Environmental Tolerance: Designed for long-term operation in industrial environments with a storage temperature up to 125°C.