The TTP223 Touch Key Module is a capacitive touch sensor based on the TTP223 IC, designed to replace traditional mechanical buttons with a reliable touch-based interface. It features a single touch-sensitive area measuring 11 × 10.5 mm, with an approximate sensing range of up to 5 mm.
An onboard LED provides a visual indication when the sensor is activated. By default, the module outputs a HIGH signal when touched and remains LOW in idle state. Using solder jumpers, the output behavior can be reconfigured to support active LOW operation or toggle (latching) mode.
This module is simple to use and ideal for applications requiring a compact and durable touch input solution.
Operating Modes (Trigger Configuration)
(1 = Shorted, 0 = Open)
- AB = 00 → Momentary (no-lock), Active HIGH output
- AB = 01 → Toggle (self-lock), Active HIGH output
- AB = 10 → Momentary (no-lock), Active LOW output
- AB = 11 → Toggle (self-lock), Active LOW output
Key Features
- Supports both momentary and latching (toggle) modes
- Configurable Active HIGH or Active LOW output
- Operating voltage range: 2V to 5.5V DC
- Fast response time: ~60 ms (fast mode), ~220 ms (low power mode) at 3V
- Adjustable sensitivity via external capacitance (0–50 pF)
- Stable human touch detection, ideal replacement for mechanical switches
- Selectable fast mode or low-power mode (via LPMB pin)
- Toggle or direct output selection (via TOG pin)
- Supports open-drain output (OPDO) or CMOS output (Q pin)
- Output polarity selectable via AHLB pin
- Adjustable maximum output on-time (up to 100 seconds, via MOTB pin)
- External power-on reset (RST pin) available
- Requires ~0.5 seconds stabilization time after power-on (no touch input during this period)
- Auto-calibration feature for reliable operation
- Automatic re-calibration every ~4 seconds when idle
