Infineon Technologies CYAT81688-100AS77Z

Overview

CYAT81688-100AS77Z 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 TX/RX lines, operating at 1.71–5.5 V supply, and featuring integrated analog front-end, programmable digital signal processing, and I²C/SPI/UART host interface - deployed in industrial HMI panels requiring robust noise immunity and glove operation.

For engineers reviewing the CYAT81688-100AS77Z datasheet, CYAT81688-100AS77Z pinout, CYAT81688-100AS77Z application, or CYAT81688-100AS77Z equivalent, key selection criteria include mutual-capacitance channel count, integrated firmware configurability, ESD tolerance (±15 kV air, ±8 kV contact), operating temperature range (–40°C to +85°C), and host interface flexibility for embedded GUI integration.

Technical Context

This device implements a mixed-signal programmable system-on-chip architecture combining ARM Cortex-M0+ CPU core with dedicated capacitive sensing hardware (CSA block), configurable analog routing, and on-die flash memory for firmware storage. It supports both self-capacitance and mutual-capacitance scanning modes with real-time baseline tracking and adaptive filtering.

The TrueTouch engine includes hardware-accelerated gesture recognition (swipe, zoom, tap), multi-finger tracking up to 10 touches, and dynamic recalibration logic to maintain linearity across voltage and temperature drift - all executed without host CPU intervention.

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 CY8C4014LQI-422 and ATMXT224E-MAU, CYAT81688-100AS77Z delivers higher channel density, field-programmable firmware, and integrated gesture acceleration - making it optimal for complex, evolving HMI designs where adaptability and noise resilience are critical.

Availability

CYAT81688-100AS77Z is available at Aetrix Electronics and suitable for industrial HMIs, medical diagnostic displays, automotive infotainment systems, and public kiosks requiring stable component supply and long lifecycle support.

Supply support for CYAT81688-100AS77Z 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 markets.

CYAT81688-100AS77Z belongs to the PSoC 4 TrueTouch family, designed specifically for high-reliability capacitive touch applications demanding programmability, noise immunity, and seamless integration into resource-constrained embedded systems.

FAQ

What host interfaces does CYAT81688-100AS77Z support?

CYAT81688-100AS77Z supports I²C (up to 1 MHz), SPI (up to 12 MHz), and UART (up to 921.6 kbps). All interfaces are implemented in hardware with dedicated DMA channels and configurable interrupt triggers. The I²C interface complies with SMBus 2.0 timing and supports clock stretching. No external level shifters are needed for 1.8 V or 3.3 V host systems due to independent VDDIO rail control.

Does CYAT81688-100AS77Z require external firmware loading at startup?

No. CYAT81688-100AS77Z contains 128 KB of on-chip flash memory storing the complete TrueTouch firmware stack, including baseline calibration, gesture recognition, and noise filtering algorithms. Firmware is executed directly from flash upon power-up; no external memory or bootloader sequence is required. Field updates are performed via authenticated I²C/SPI commands with SHA-256 signature verification.

Can CYAT81688-100AS77Z operate with projected-capacitive overlays thicker than 3 mm?

Yes. With programmable drive strength (up to 20 mA per TX line) and adjustable integration time, CYAT81688-100AS77Z supports cover glass thicknesses up to 8 mm and overlay materials including PMMA, Gorilla Glass, and laminated composites. Performance validation data confirms stable 10-finger tracking through 5 mm thick tempered glass with 250 g/m² PET overlay under ESD stress conditions.

Is CYAT81688-100AS77Z qualified for automotive applications?

CYAT81688-100AS77Z meets AEC-Q100 Grade 3 (–40°C to +85°C) qualification and includes built-in diagnostics such as memory CRC checks, clock monitor, and supply voltage supervision. While not AEC-Q100 Grade 2 rated, its thermal performance, ESD robustness, and fault reporting make it suitable for non-safety-critical automotive cabin applications like rear-seat entertainment and climate control interfaces.