Infineon Technologies CYAT81688-100AA71Z

Overview

CYAT81688-100AA71Z from Infineon Technologies is a PSoC-based TrueTouch capacitive touchscreen controller IC with 100-pin TQFP package, supporting up to 48 sense channels and 48 drive channels, 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 CYAT81688-100AA71Z datasheet, CYAT81688-100AA71Z pinout, CYAT81688-100AA71Z application, or CYAT81688-100AA71Z equivalent, key selection criteria include mutual-capacitance scan resolution, I²C/SPI interface timing compliance, ESD immunity (±15 kV air, ±8 kV contact), and firmware-upgradable gesture engine for multi-touch tracking in harsh environments.

Technical Context

This device integrates a programmable analog signal chain with configurable IDACs and SAR ADCs for high-SNR capacitance measurement, coupled with a dedicated touch engine that offloads host CPU by executing baseline compensation, noise filtering, and centroid calculation autonomously. It supports both self- and mutual-capacitance sensing modes with dynamic reconfiguration.

The ARM Cortex-M0+ core runs proprietary touch firmware and enables custom gesture logic, while hardware-accelerated cryptographic modules support secure boot and firmware authentication. Communication occurs via configurable I²C (up to 1 MHz) or SPI (up to 12 MHz) with interrupt-driven status reporting.

Key Specifications

Pinout & Package

100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad (EPAD) connected to VSS for PCB-level heat dissipation in continuous operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C4248LQI-BL583 and MTCH6302-I/ST, CYAT81688-100AA71Z delivers higher channel density, hardware-enforced security, and field-proven ESD resilience-critical for long-lifecycle industrial and medical deployments where touch reliability directly impacts system safety and uptime.

Availability

CYAT81688-100AA71Z is available at Aetrix Electronics and suitable for industrial HMI panels, medical diagnostic displays, avionics control units, and ruggedized tablet interfaces requiring stable component supply across extended product lifecycles.

Supply support for CYAT81688-100AA71Z 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, automotive ICs, and secure microcontrollers, with global R&D centers and ISO/TS 16949-certified wafer fabs.

CYAT81688 belongs to the TrueTouch Gen5 family, designed specifically for mission-critical human-machine interfaces demanding high noise immunity, long-term calibration stability, and functional safety compliance in industrial and healthcare settings.

FAQ

What is the maximum supported electrode count for CYAT81688-100AA71Z?

The device supports up to 48 drive and 48 sense electrodes, enabling a 48×48 mutual-capacitance matrix for high-resolution touch detection on displays up to 15.6 inches diagonal. Electrode count is fixed in hardware; no runtime reconfiguration beyond this limit is possible.

Does CYAT81688-100AA71Z require an external crystal oscillator?

No. The device integrates a factory-trimmed 48 MHz internal oscillator with ±2% accuracy over temperature and voltage, sufficient for all touch timing and communication functions. An external crystal is optional only if tighter frequency stability (<±50 ppm) is required for synchronized multi-device systems.

Can the touch firmware be updated in the field?

Yes. Firmware updates are performed via I²C or SPI using signed, encrypted images verified by on-chip HMAC-SHA-256 and AES-128 decryption. Updates preserve calibration data and require valid signature before execution-no unsigned or unauthenticated code can be loaded.

Is the EPAD on the TQFP package electrically connected internally?

Yes. The exposed thermal pad (EPAD) is internally tied to VSS and must be soldered to a solid copper pour connected to the system ground plane. Thermal resistance drops from 42°C/W (unconnected) to 28°C/W when properly attached, critical for sustained 120 Hz operation at 85°C ambient.