Infineon Technologies CYAT81682-100AA71

Overview

CYAT81682-100AA71 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, and I²C/SPI interface. It delivers real-time multi-touch tracking for industrial HMI panels requiring robust noise immunity and glove operation.

For engineers reviewing the CYAT81682-100AA71 datasheet, CYAT81682-100AA71 pinout, CYAT81682-100AA71 application, or CYAT81682-100AA71 equivalent, key selection criteria include channel count, mutual-capacitance architecture, integrated analog front-end gain control, and operating voltage range (2.7–5.5 V).

Technical Context

This device implements a fully integrated capacitive sensing system-on-chip built on Cypress PSoC 4 architecture, combining ARM Cortex-M0+ core with programmable analog and digital blocks. It supports both self- and mutual-capacitance measurement modes, with configurable scan rates up to 120 Hz and built-in baseline tracking and noise filtering algorithms.

The controller integrates dedicated hardware accelerators for touch algorithm execution, reducing host CPU load. Its analog front-end includes programmable current sources (0.1–10 mA), adjustable integration time (1–255 µs), and 12-bit SAR ADC with internal reference, enabling high SNR in electrically noisy environments.

Key Specifications

Pinout & Package

100-pin TQFP (14 mm × 14 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 CY8C4014LQI-422 and MTCH6302-I/SS, CYAT81682-100AA71 uniquely combines full PSoC programmability, hardware-accelerated mutual-capacitance processing, and industrial-grade noise resilience - making it optimal for adaptive, mission-critical HMI designs.

Availability

CYAT81682-100AA71 is available at Aetrix Electronics and suitable for industrial control panels, medical device interfaces, and smart building thermostats requiring stable component supply and long-term lifecycle support.

Supply support for CYAT81682-100AA71 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 and manufacturing infrastructure.

CYAT81682 belongs to the TrueTouch Gen5 family - designed specifically for high-noise, high-reliability capacitive touch applications in industrial and medical equipment where robustness and configurability outweigh lowest-cost constraints.

FAQ

What is the maximum overlay thickness supported by CYAT81682-100AA71?

The device supports up to 8 mm acrylic or 5 mm glass overlay thickness in mutual-capacitance mode, verified per IEC 61000-4-2 and IEC 61000-4-3 test reports. Performance depends on electrode pitch, drive strength, and noise environment - configuration tools allow real-time tuning of current source and integration time to maintain SNR.

Does CYAT81682-100AA71 require an external crystal?

No. It uses an internal precision 48 MHz PLL clock derived from a 1–20 MHz external crystal or ceramic resonator, or can operate from its internal 4 MHz IMO. The device includes automatic frequency calibration and supports crystal-less operation in low-power modes using the WCO (32.768 kHz).

Can the touch firmware be updated in-system?

Yes. The device supports field firmware updates via I²C or SPI using Cypress-provided bootloader infrastructure. Application code resides in on-chip flash memory and can be reprogrammed without JTAG, enabling post-deployment feature enhancements and calibration adjustments.

What ESD protection level does CYAT81682-100AA71 provide on its touch IOs?

All touch IOs are rated to ±15 kV HBM and ±8 kV IEC 61000-4-2 contact discharge. This is achieved through integrated transient voltage suppression diodes and layout-optimized ESD structures - no external TVS devices are required for basic compliance in Class B industrial environments.