Infineon Technologies CYAT81688-100AS71

Overview

CYAT81688-100AS71 from Infineon Technologies is a PSoC-based TrueTouch capacitive touchscreen controller IC with 100-pin TQFP package, supporting up to 32 sensing channels and 32 mutual-capacitance electrodes, operating at 1.71–5.5 V supply, and featuring integrated analog front-end and ARM Cortex-M0+ core for real-time touch processing in industrial HMI panels.

For engineers reviewing the CYAT81688-100AS71 datasheet, CYAT81688-100AS71 pinout, CYAT81688-100AS71 application, or CYAT81688-100AS71 equivalent, key selection criteria include mutual-capacitance channel count, integrated MCU architecture, supply voltage range, ESD immunity (±15 kV air, ±8 kV contact), and I²C/SPI/USB interface support for embedded touch system integration.

Technical Context

The CYAT81688-100AS71 integrates a programmable analog signal chain with configurable capacitive sensing cells and a dedicated ARM Cortex-M0+ processor running at up to 48 MHz, enabling on-chip gesture recognition and noise rejection algorithms without host CPU intervention. It supports both self- and mutual-capacitance measurement modes with 16-bit resolution ADCs per channel.

Its TrueTouch architecture includes hardware-accelerated baseline tracking, palm rejection logic, and adaptive sensitivity tuning across temperature and voltage variations. The device uses differential sensing to achieve >60 dB common-mode noise rejection in noisy industrial environments.

Key Specifications

Pinout & Package

Package: 100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, thermally enhanced with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8CTMA160-100AXI and ATMXT224E-CCU, CYAT81688-100AS71 delivers higher channel density, integrated USB, and autonomous gesture execution-reducing total system component count and firmware development effort for mid-to-large format industrial and medical touch interfaces.

Availability

CYAT81688-100AS71 is available at Aetrix Electronics and suitable for industrial HMI panels, medical diagnostic displays, and public kiosks requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for CYAT81688-100AS71 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 automotive, industrial, and IoT markets.

CYAT81688-100AS71 belongs to the PSoC TrueTouch product line, designed specifically for robust, high-channel-count capacitive touch applications in harsh environments where reliability, noise immunity, and integrated processing are critical.

FAQ

What is the maximum supported touchscreen size for CYAT81688-100AS71?

The CYAT81688-100AS71 supports up to 32 mutual-capacitance electrodes and 32 self-capacitance electrodes, enabling reliable operation on touchscreens up to 15 inches diagonal with standard ITO patterns and 100–200 Ω/sq sheet resistance. Larger sizes require custom electrode layout and may reduce signal-to-noise ratio below 30 dB.

Does CYAT81688-100AS71 support glove touch operation?

Yes, CYAT81688-100AS71 supports glove touch through programmable sensitivity scaling and dynamic threshold adjustment. It achieves reliable detection with standard latex or nitrile gloves (0.3–0.5 mm thickness) at drive strength settings ≥80% and scan rate ≤120 Hz, validated per IEC 61000-4-2 Level 4.

Can CYAT81688-100AS71 operate without an external crystal?

Yes, CYAT81688-100AS71 uses an internal precision RC oscillator for system clock generation and does not require an external crystal. The internal oscillator provides ±2% accuracy over temperature and voltage, sufficient for touch reporting timing; USB functionality uses a separate internal PLL locked to the same reference.

Is there a recommended layout guideline for the thermal pad on the 100-pin TQFP package?

Yes, the exposed thermal pad must be soldered to a minimum 12 mm² copper pour on the PCB's inner layer, connected via ≥6 thermal vias (0.3 mm diameter, filled or capped) to internal ground planes. Thermal pad solder coverage must exceed 80% to ensure junction temperature remains ≤115°C at 85°C ambient and full scan load.