TTP223 TTP224 TTP226 TTP229 Capacitive Touch Sensor Module Digital Touch Key Switch Board

TTP223 / TTP224 / TTP226 / TTP229 Capacitive Touch Sensor Module

Replace mechanical buttons with reliable, silent capacitive touch sensing using the TTP series touch key IC modules. Based on the TONTEK TTP223/224/226/229 capacitive sensing ICs, these modules detect finger touch through non-conductive surfaces — enabling sleek, waterproof, and wear-free touch interfaces for Arduino, ESP32, STM32, and Raspberry Pi projects.

Variant Selection Guide

• TTP223B / TTP223 (Blue/Red) — 1-channel single touch key, digital HIGH/LOW output, smallest footprint. Ideal for single button replacement.
• TTP224 — 4-channel touch keypad, 4 independent digital outputs. For 4-button panels and directional controls.
• TTP226 — 8-channel touch keypad, 8 independent outputs. For numeric keypads and multi-zone touch panels.
• TTP229 — 16-channel touch keypad, serial output (2-wire). For full 16-key touch keyboards and complex HMI panels.

TTP223 Specifications (Single Channel)

• Supply Voltage: 2.4V – 5.5V DC
• Output Type: Digital (active HIGH or LOW, configurable)
• Operating Modes: Toggle mode or momentary mode (via AHLB and TOG pads)
• Response Time: 60ms (fast mode) / 220ms (low power mode)
• Standby Current: <3µA (low power mode)
• Operating Current: ~3.5mA typical
• Sensitivity: Adjustable via external capacitor (0–50pF)
• Operating Temperature: −40°C to +85°C

TTP229 Specifications (16-Channel)

• Supply Voltage: 2.4V – 5.5V DC
• Channels: 16 independent touch keys
• Output Interface: 2-wire serial (SCL/SDO) — not I²C, proprietary protocol
• Sampling Rate: Configurable via TP2 pad
• Multi-key Detection: Supports single-key or multi-key mode

Key Features

• No mechanical parts — unlimited touch life, silent operation
• Works through non-conductive materials (glass, plastic, acrylic up to 3mm)
• Auto-calibration on power-up — no manual tuning required
• Built-in noise immunity for stable operation near power supplies
• Direct GPIO connection — no external components needed for basic use
• Toggle and momentary output modes selectable via solder pads

Arduino Wiring (TTP223 Example)

• VCC → 3.3V or 5V
• GND → GND
• I/O → any digital input pin (e.g. D2)
• Read with digitalRead() — HIGH when touched, LOW when released (default)

Typical Applications

• Touch-activated LED and relay switches
• Arduino and ESP32 touch keypads and menus
• Waterproof panel controls (behind acrylic or glass)
• Smart home light switches and dimmer controls
• Wearable device buttons
• Industrial HMI touch panels
• Capacitive proximity detection

Package Contents

• 1 × Capacitive touch sensor module (variant as selected)

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