Description
The TTP223 Capacitive Touch Switch Module is a single-key capacitive touch sensor board designed to replace traditional mechanical push buttons with a modern, contactless interface. It is built around the TonTouch TTP223 touch pad detector IC, which detects changes in capacitance when a human finger approaches the sensing area, converting the touch into a clean digital output signal .
The module operates from a wide supply voltage of 2.0V to 5.5V, making it directly compatible with Arduino, ESP32, ESP8266, Raspberry Pi, and most microcontroller platforms . It features ultra-low power consumption, drawing typically 1.5µA in low-power mode at 3V, making it ideal for battery-powered and energy-sensitive designs . The response time is approximately 60ms in fast mode and 220ms in low-power mode .
A key feature of this module is its configurable output behavior. Through onboard solder jumpers (labeled A and B), users can select between momentary (direct) mode and self-locking (toggle) mode, as well as active-high or active-low output polarity . In the default configuration (both jumpers open), the output is LOW when untouched and goes HIGH when touched, behaving like a momentary push button .
Critical limitations: The TTP223 is a digital switch, not an analog sensor—it provides HIGH/LOW output, not proportional touch-strength readings. The sensing area is on the PCB; while it can detect touch through non-metallic materials like glass or plastic (up to ~5mm), metal objects near the sensor can cause false triggers . The module has a 0.5-second stabilization period after power-on during which touches are ignored . The output can only source/sink a few milliamps—use a transistor or relay for higher-current loads.
Features
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Capacitive Touch Sensing: Detects human touch through capacitance change, with no mechanical wear .
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Wide Operating Voltage (2.0V–5.5V): Compatible with 3.3V and 5V systems .
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Ultra-Low Power Consumption: 1.5µA (low-power mode) at 3V .
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Configurable Output Modes: Momentary or self-locking (toggle) via solder jumpers .
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Selectable Output Polarity: Active-high or active-low via jumper .
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Touch-Through-Panel Capable: Detects touch through glass, plastic, and acrylic (up to ~5mm) .
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Fast Response Time: ~60ms in fast mode, ~220ms in low-power mode .
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Simple 3-Pin Interface: VCC, GND, SIG for easy wiring .
Technical Specifications
| Parameter | Specification |
|---|---|
| Sensor IC | TTP223 (TonTouch) |
| Operating Voltage | 2.0V – 5.5V DC |
| Operating Current (3V) | 1.5µA typ (low-power mode) |
| Response Time | 60ms max (fast); 220ms max (low-power) |
| Output Type | Digital CMOS, active-high default |
| Output Drive | ~4mA typical |
| Sensing Distance | Up to ~5mm through dielectric material |
| Operating Temperature | -40°C to +85°C |
| Pin Count | 3 (VCC, GND, SIG) |
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