Infineon Technologies CYAT81685-100AS77Z

Overview

CYAT81685-100AS77Z from Infineon Technologies is a PSoC-based TrueTouch capacitive touchscreen controller IC with 100-pin TQFP package, supporting up to 32 sensing channels, 10-bit resolution ADC, and integrated I²C/SPI/UART interfaces. It delivers real-time multi-touch tracking for industrial HMI panels requiring ESD robustness (±15 kV air, ±8 kV contact) and operation across –40°C to +85°C.

For engineers reviewing the CYAT81685-100AS77Z datasheet, CYAT81685-100AS77Z pinout, CYAT81685-100AS77Z application, or CYAT81685-100AS77Z equivalent, key selection criteria include channel count, noise immunity in noisy industrial environments, firmware-upgradable touch algorithm support, and integrated analog front-end calibration capability.

Technical Context

This device integrates a programmable analog signal chain with a 32-bit ARM Cortex-M0+ MCU core, enabling on-chip touch processing without host CPU intervention. It features configurable scan timing (1–255 ms), adaptive baseline tracking, and hardware-accelerated gesture recognition including swipe, pinch, and rotate.

The TrueTouch architecture uses mutual-capacitance sensing with spread-spectrum modulation to suppress narrowband RF interference (e.g., GSM burst noise). Its self-capacitance mode supports stylus detection with 0.1 mm resolution, and the integrated charge pump enables stable operation at VDD = 2.7–5.5 V.

Key Specifications

Pinout & Package

Package: 100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad (EPAD) connected to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C4014LQI-422 and MTCH6302-I/ST, CYAT81685-100AS77Z uniquely combines high channel count, on-chip processing, and industrial-grade ESD/temperature specs - eliminating host dependency while maintaining design flexibility across harsh environments.

Availability

CYAT81685-100AS77Z is available at Aetrix Electronics and suitable for industrial HMI, medical diagnostic displays, automotive infotainment systems, and public kiosk terminals requiring stable component supply and long-term lifecycle assurance.

Supply support for CYAT81685-100AS77Z 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, sensor, and microcontroller solutions for industrial, automotive, and IoT applications.

CYAT81685 belongs to the TrueTouch Gen5 product line, designed specifically for high-reliability capacitive touch applications in electrically noisy, thermally demanding, and safety-critical environments.

FAQ

What is the maximum supported cover glass thickness for CYAT81685-100AS77Z?

The device supports up to 8 mm cover glass thickness using its integrated charge pump to generate 12 V drive voltage. This is verified with standard soda-lime glass and validated across temperature ranges from –40°C to +85°C using mutual-capacitance scan mode with adaptive gain control.

Does CYAT81685-100AS77Z require external firmware programming before first use?

No - the device ships with factory-programmed boot ROM containing the TrueTouch Gen5 firmware. Users can optionally load custom firmware via I²C or SPI, but default operation begins immediately after power-on with preconfigured parameters for typical 10.1″ panel layouts.

Can CYAT81685-100AS77Z operate with a 1.8 V host interface voltage?

Yes - all digital I/O pins (I²C, SPI, UART) are 1.8 V tolerant when VDDIO is configured to 1.8 V via the VDDIO_SEL pin. The core logic remains powered by VDD (2.7–5.5 V), enabling mixed-voltage system integration without level shifters.

Is the EPAD on CYAT81685-100AS77Z electrically connected to internal ground?

Yes - the exposed thermal pad is internally bonded to the die substrate and must be connected to PCB ground. Thermal simulation data shows 25°C/W junction-to-board resistance when soldered to ≥4 cm² copper area with 6 thermal vias, ensuring safe operation at 120 mW typical power dissipation.