Infineon Technologies CYAT81689-100AS61Z

Overview

CYAT81689-100AS61Z from Infineon Technologies is a capacitive touch controller IC designed for single-chip multi-touch solutions in consumer and industrial human-machine interfaces. It integrates 16-channel analog front-end, 12-bit SAR ADC, on-chip firmware engine, and supports up to 10 simultaneous touch points with <10ms report rate. Used in smart home control panels and industrial HMI displays requiring robust noise immunity.

For engineers reviewing the CYAT81689-100AS61Z datasheet, CYAT81689-100AS61Z pinout, CYAT81689-100AS61Z application, or CYAT81689-100AS61Z equivalent, key selection criteria include mutual-capacitance scan resolution, integrated self-test capability, I²C/SPI interface timing compliance, and operating temperature range validation for embedded panel integration.

Technical Context

This device implements a dedicated capacitive sensing architecture with programmable charge-transfer measurement cycles per electrode pair. It features adaptive baseline tracking, real-time noise suppression via digital filtering, and hardware-accelerated gesture recognition including swipe and zoom.

The controller operates from a single 2.7–3.6V supply, includes internal voltage regulators for analog and digital domains, and supports host communication via configurable I²C (up to 400 kHz) or SPI (up to 10 MHz) interfaces with interrupt-driven status reporting.

Key Specifications

Pinout & Package

Package: 48-pin QFN (7 mm × 7 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar capacitive touch controller applications.

Compared with CYAT81689-100AS61Z, the mXT224E offers greater electrode scalability but increases BOM footprint and firmware complexity, while the STMTS300 reduces component cost at the expense of real-time gesture offload and noise resilience in harsh environments.

Availability

CYAT81689-100AS61Z is available at Aetrix Electronics and suitable for smart home control panels, industrial HMI displays, medical device touchscreens, and commercial kiosk interfaces requiring stable component supply and long-term production support.

Supply support for CYAT81689-100AS61Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power management, sensing, and security ICs for automotive, industrial, and IoT applications.

CYAT81689-100AS61Z belongs to the TrueTouch® family, engineered specifically for high-reliability, noise-immune capacitive touch interfaces in mission-critical embedded systems.

FAQ

What is the maximum electrode matrix size supported by CYAT81689-100AS61Z?

The device supports up to 16 transmit and 16 receive lines, enabling a maximum 16×16 mutual-capacitance matrix (256 nodes). Full 10-finger tracking is maintained across this configuration with ≤10 ms report latency under typical PCB parasitics and firmware settings.

Does CYAT81689-100AS61Z require external calibration during operation?

No external calibration is required. The IC performs continuous adaptive baseline tracking and automatic drift compensation using on-chip algorithms. Factory calibration data is stored in one-time-programmable memory and applied at power-up; runtime recalibration occurs autonomously every 30 seconds unless disabled via register control.

Can CYAT81689-100AS61Z operate with wet fingers or water droplets on the overlay?

Yes. The device includes dedicated wet-finger detection circuitry and supports operation with up to 0.5 mm continuous water film. It distinguishes between valid touch and moisture artifacts using differential signal analysis and dynamic threshold adjustment, validated per IEC 61000-4-2 and IPX1 test conditions.

What debug interfaces are available for firmware development and tuning?

The IC provides a UART-based debug interface accessible via dedicated TEST pins (TxD/RxD), supporting real-time sensor data streaming, register read/write, and firmware update over UART at 115.2 kbps. No JTAG or SWD is implemented; all configuration and tuning is performed through the primary I²C/SPI host interface or UART debug port.