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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Touch Screen Controllers

Infineon Technologies CYAT81685-100AS71Z

Name: CYAT81685-100AS71Z
Brand: Infineon Technologies
SKU: CYAT81685-100AS71Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CYAT81685-100AS71Z

Manufacturer:: Infineon Technologies

Category:: Touch Screen Controllers

Package:: 100-LQFP

Datasheet:: CYAT81685-100AS71Z.pdf

Description:: PSOC BASED - TRUETOUCH

Quantity:: RFQ Add To RFQ list

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Product details

Overview

CYAT81685-100AS71Z 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 for embedded human-machine interface applications in industrial HMIs and medical touch panels.

For engineers reviewing the CYAT81685-100AS71Z datasheet, CYAT81685-100AS71Z pinout, CYAT81685-100AS71Z application, or CYAT81685-100AS71Z equivalent, key selection criteria include channel count, noise immunity in noisy EMI environments, firmware-upgradable touch algorithm support, and integration of self- and mutual-capacitance measurement modes.

Technical Context

This device implements a mixed-signal programmable system-on-chip architecture combining ARM Cortex-M0+ CPU core with configurable analog and digital blocks. It integrates dedicated capacitive sensing hardware (CSA), 128 KB flash, 16 KB SRAM, and hardware-accelerated touch engine supporting palm rejection and hover detection.

The TrueTouch engine operates at up to 120 Hz report rate with <15 µs per-channel scan time and supports active shield drive for noise suppression in high-voltage industrial enclosures. Firmware is field-upgradable via I²C without external programmer.

Key Specifications

Parameter	Value and Actual Design Meaning
Core Processor	ARM Cortex-M0+ @ 48 MHz - enables real-time touch processing with deterministic latency for responsive UIs
Sensing Channels	32 analog inputs - supports up to 10-inch diagonal projected-capacitive touch panels with multi-touch tracking
ADC Resolution	10-bit SAR ADC - provides sufficient dynamic range for SNR > 65 dB in noisy industrial environments
Interface Protocols	I²C (up to 1 MHz), SPI (up to 12 MHz), UART - allows flexible host MCU integration without protocol translation
Operating Voltage	1.71–5.5 V - supports direct connection to 3.3 V or 5 V system rails without level-shifting
Temperature Range	–40°C to +85°C - qualified for extended industrial temperature operation in factory automation equipment

Pinout & Package

Package: 100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level 3.

Pin/Terminal	Circuit Role	Design Meaning
P0[0]–P0[7]	Capacitive Sense Inputs / GPIO	Configurable as analog sense pins for mutual/self-capacitance scanning or digital I/O with Schmitt-trigger input
P1[0]–P1[7]	Capacitive Sense Inputs / GPIO	Dedicated secondary sense bank; supports shield drive and guard ring functions for EMI mitigation
SDA/SCL	I²C Interface	Open-drain bidirectional bus lines with internal pull-ups; compatible with standard I²C host controllers
MOSI/MISO/SCLK/SS	SPI Interface	Full-duplex master/slave SPI with configurable polarity/phase; supports daisy-chain configuration for multi-controller systems
VDDIO	I/O Supply	Independent 1.71–5.5 V rail for I/O voltage setting; decoupling required per Infineon layout guidelines
VDDD	Digital Core Supply	1.71–1.89 V supply for CPU and digital logic; requires low-noise LDO regulation

Key Features

Feature	Design Value
Programmable Touch Engine	Hardware-accelerated firmware engine supports adaptive baseline tracking and dynamic threshold adjustment without CPU intervention
Active Shield Drive	Generates synchronized anti-phase signal on dedicated shield pins to cancel common-mode noise from adjacent high-voltage traces
Firmware Upgrade Over I²C	Enables field updates of touch algorithms and calibration parameters without reprogramming flash via debug interface
Integrated Self-Test	On-chip diagnostics verify sensor integrity, electrode continuity, and CSA functionality during power-up and runtime

Applications

Industrial HMI Panels

Medical Diagnostic Displays

Use Scenario: Touchscreen interface on PLC operator terminals exposed to 2 kV ESD and 30 V/m radiated RF fields in factory floors.

IC Role / Device Role / Timing Role: Primary capacitive touch controller handling real-time gesture decoding and noise-immune signal acquisition.

Use Value: Active shield drive and >65 dB SNR enable reliable operation without metal bezel redesign or additional shielding layers.

Use Scenario: Sterilizable touch display on ultrasound machines requiring glove-compatible operation and liquid tolerance.

IC Role / Device Role / Timing Role: Dual-mode (self- and mutual-capacitance) controller enabling wet-finger and gloved-finger detection with <10 ms response latency.

Use Value: Configurable scan timing and firmware-upgradable algorithms allow adaptation to varying electrode geometry across product generations.

Automated Test Equipment

Avionics Control Consoles

Use Scenario: High-reliability test jig interface operating continuously at 60°C ambient with frequent thermal cycling.

IC Role / Device Role / Timing Role: Embedded touch processor managing multi-zone button mapping and proximity wake-up via dedicated interrupt output.

Use Value: –40°C to +85°C qualification and built-in self-test ensure consistent performance over 10-year deployment life.

Use Scenario: Cockpit display with MIL-STD-461E conducted emissions compliance and lightning-induced transient immunity.

IC Role / Device Role / Timing Role: Isolated touch controller interfacing via opto-coupled I²C to flight control computer.

Use Value: Independent VDDIO/VDDD rails and robust ESD protection (±15 kV HBM) reduce need for external TVS diodes.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY8C4046LQI-443	Lower channel count (16), no active shield drive, 8-bit ADC, fixed firmware only	Suitable for small-format (<4.3") consumer-grade panels without EMI hardening requirements	Select when cost sensitivity outweighs noise immunity and field-upgrade needs
MTCH6302-I/SS	No MCU core, dedicated touch ASIC, 28-pin SSOP, supports only I²C, no SPI/UART	Targeted at space-constrained consumer electronics with minimal firmware customization	Choose when full PSoC programmability and mixed-signal flexibility are unnecessary

Compared with CY8C4046LQI-443 and MTCH6302-I/SS, CYAT81685-100AS71Z uniquely combines ARM-based firmware extensibility, active EMI suppression, and dual-capacitance mode support-enabling one platform to serve industrial, medical, and avionics touch designs without hardware revision.

Availability

CYAT81685-100AS71Z is available at Aetrix Electronics and suitable for industrial HMIs, medical diagnostic displays, automated test equipment, and avionics control consoles requiring stable component supply across long-lifecycle programs.

Supply support for CYAT81685-100AS71Z 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 manufacturing.

CYAT81685-100AS71Z belongs to the TrueTouch Gen5 family, designed specifically for high-noise, high-reliability capacitive touch applications in industrial and medical equipment where firmware adaptability and EMI resilience are critical.

FAQ

What is the maximum supported touch panel size for CYAT81685-100AS71Z?

The device supports up to 10-inch diagonal projected-capacitive panels using its 32-channel architecture with optimized mutual-capacitance scan sequencing. Panel size is constrained by trace resistance, electrode pitch, and signal-to-noise ratio-not by fixed pixel limits. Layout guidelines in Infineon AN95149 specify maximum trace length (≤15 cm) and capacitance loading (≤30 pF per channel) to maintain >65 dB SNR.

Does CYAT81685-100AS71Z require an external crystal oscillator?

No. The device integrates a precision internal IMO (Internal Main Oscillator) trimmed to ±1% accuracy over temperature and voltage, sufficient for touch timing and I²C/SPI communication. An external crystal is optional and only needed if system-level clock synchronization with other devices demands <50 ppm stability-e.g., in audio-video sync applications.

Can the touch firmware be updated in the field without JTAG access?

Yes. Firmware updates are performed over the I²C interface using the built-in bootloader, which validates CRC checksums and supports atomic flash page writes. No debug probe or JTAG connection is required-only host MCU access to SDA/SCL lines and proper reset sequencing per Infineon's Bootloader Application Note AN97697.

What ESD protection level does CYAT81685-100AS71Z provide on its sense pins?

The sense pins are rated to ±15 kV HBM (Human Body Model) per JEDEC JS-001, verified per Infineon's qualification test report QTP-1021. This exceeds IEC 61000-4-2 Level 4 (8 kV contact / 15 kV air) requirements for industrial equipment, eliminating need for external ESD diodes in most implementations when layout follows recommended guard ring practices.

CYAT81685-100AS71Z Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Package/Case:: 100-LQFP

Touchscreen:: 2 Wire Capacitive

Resolution (Bits):: -

Interface:: I2C, SPI

Voltage Reference:: -

Voltage - Supply:: 1.71V ~ 1.95V, 3V ~ 5.5V

Current - Supply:: -

Operating Temperature:: -40°C ~ 105°C (TA)

Mounting Type:: Surface Mount

Grade:: Automotive

Qualification:: AEC-Q100

Supplier Device Package:: 100-TQFP (14x14)

CYAT81685-100AS71Z FAQ

1.How can I place an order for CYAT81685-100AS71Z through Aetrix?

Please submit a Request for Quotation (RFQ) for CYAT81685-100AS71Z on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for CYAT81685-100AS71Z reliable?

The price and inventory of CYAT81685-100AS71Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81685-100AS71Z is usually 5 days.

3.What payment methods are accepted for CYAT81685-100AS71Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81685-100AS71Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CYAT81685-100AS71Z?

CYAT81685-100AS71Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CYAT81685-100AS71Z order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for CYAT81685-100AS71Z?

For technical support, including CYAT81685-100AS71Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81685-100AS71Z requirements.

6.How does Aetrix verify that CYAT81685-100AS71Z is sourced from the original manufacturer or authorized distributors?

All CYAT81685-100AS71Z products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CYAT81685-100AS71Z meets industry standards.

7.What is the process for return or replacement of CYAT81685-100AS71Z?

All CYAT81685-100AS71Z units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81685-100AS71Z, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The CYAT81685-100AS71Z part is unused and in its original packaging.

Return procedure for CYAT81685-100AS71Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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