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Infineon Technologies CYAT81688-100AS61KHT
- Part No.:
- CYAT81688-100AS61KHT
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 100-LQFP
- Datasheet:
-
CYAT81688-100AS61KHT.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:1,918
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Product details
Overview
CYAT81688-100AS61KHT 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 buttons, operating at 1.71–5.5 V supply voltage, and featuring integrated analog front-end and I²C/SPI/UART interfaces for embedded human-machine interface applications in industrial HMIs and medical touch panels.
For engineers reviewing the CYAT81688-100AS61KHT datasheet, CYAT81688-100AS61KHT pinout, CYAT81688-100AS61KHT application, or CYAT81688-100AS61KHT equivalent, key selection criteria include mutual-capacitance channel count, integrated noise immunity architecture, firmware-upgradable touch algorithm, and support for wet-finger and glove operation in harsh environments.
Technical Context
This device implements a programmable mixed-signal array with ARM Cortex-M0+ core, dedicated capacitive sensing hardware (CSH), and configurable analog/digital blocks enabling real-time touch processing without host CPU intervention. It supports self- and mutual-capacitance scanning modes with adaptive baseline tracking and dynamic recalibration.
The TrueTouch architecture includes on-chip sigma-delta ADCs with 16-bit resolution per channel, programmable gain amplifiers, and digital filtering optimized for SNR > 60 dB in noisy industrial settings. Firmware execution occurs from on-die flash memory with secure boot and AES-128 encryption support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Processor | ARM Cortex-M0+ @ 48 MHz - enables real-time touch algorithm execution and host communication handling without external MCU. |
| Sensing Channels | 32 mutual + 32 self-capacitance - supports high-resolution touchscreens up to 10-inch diagonal with multi-touch gesture recognition. |
| Supply Voltage | 1.71–5.5 V - allows direct integration with 3.3 V or 5 V system rails without level-shifting circuitry. |
| Interface Protocols | I²C (up to 1 MHz), SPI (up to 12 MHz), UART - provides flexible host connectivity options for diverse controller architectures. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and medical equipment deployed in uncontrolled ambient environments. |
| Firmware Memory | 256 KB flash + 32 KB SRAM - accommodates complex touch algorithms, calibration data storage, and field-upgradable firmware images. |
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 |
|---|---|---|
| VDDIO | I/O Supply | Supplies 1.71–5.5 V to all digital I/O pins; decoupling required per Infineon layout guidelines. |
| VDDA | Analog Supply | Provides clean 3.3 V ±5% for analog front-end; must be isolated from digital ground with ferrite bead or LC filter. |
| SDA/SCL | I²C Interface | Open-drain bidirectional signals supporting standard/fast-mode I²C up to 1 MHz; internal pull-ups disabled by default. |
| SSN/SCK/MOSI/MISO | SPI Interface | Four-wire full-duplex SPI with programmable polarity/phase; supports daisy-chain configuration for multi-controller systems. |
| TXD/RXD | UART Interface | Asynchronous serial interface with hardware flow control support; operates at baud rates up to 921.6 kbps. |
| CTP<0..31> | Capsense Terminals | Configurable as TX (drive) or RX (sense) pins for mutual-capacitance matrix; each supports programmable drive strength and sampling rate. |
Key Features
| Feature | Design Value |
|---|---|
| Wet-Finger Rejection | Hardware-accelerated algorithm distinguishes water droplets from intentional touch, maintaining usability in humid or outdoor environments. |
| Glove Mode Support | Dual-scan mode increases signal-to-noise ratio by 12 dB, enabling reliable detection through 3 mm thick leather or synthetic gloves. |
| Noise Immunity | Integrated spread-spectrum modulation and correlated double sampling suppress 50/60 Hz EMI and RF interference up to 1 GHz. |
| Secure Boot | Verifies digital signature of firmware image using SHA-256 hash before execution, preventing unauthorized code injection. |
| Dynamic Calibration | Automatic baseline adjustment every 100 ms compensates for temperature drift and environmental capacitance shifts without user intervention. |
Applications
| Industrial HMI Panels | Medical Diagnostic Devices |
|---|---|
Use Scenario: Touchscreen interface on factory-floor operator terminals exposed to oil mist, metal shavings, and wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary capacitive touch controller managing button grid and slider inputs with real-time response <15 ms latency. Use Value: Wet-finger rejection and −40°C to +85°C operation ensure continuous UI availability without recalibration during shift changes. | Use Scenario: Touch-enabled ultrasound machine control panel requiring sterile-glove operation and EMI resilience near MRI equipment. IC Role / Device Role / Timing Role: Dedicated touch processor offloading gesture recognition and multi-touch tracking from main imaging SoC. Use Value: Spread-spectrum modulation and RF immunity prevent false triggers during simultaneous RF transmission and touch input. |
| Automotive Infotainment | Smart Building Control Panels |
Use Scenario: Center console display in commercial vehicles where users wear winter gloves and cabin temperatures range from −30°C to +70°C. IC Role / Device Role / Timing Role: Touch controller with integrated glove-mode firmware and automotive-grade thermal compensation. Use Value: Dual-scan mode delivers consistent 5-point touch detection through 2 mm nitrile gloves without increasing power consumption. | Use Scenario: Wall-mounted HVAC and lighting control panel in office buildings with variable ambient humidity and AC line noise. IC Role / Device Role / Timing Role: Standalone touch interface processor interfacing via I²C to building automation MCU. Use Value: Adaptive baseline tracking maintains stable touch thresholds across seasonal humidity changes (30–90% RH). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C40468-LQI | Lower channel count (16 mutual), no glove/wet-finger firmware acceleration, 64-pin QFN package. | Limited to smaller displays (<5") and non-industrial environments; lacks dynamic recalibration engine. | Select when cost-sensitive designs require basic touch functionality without environmental robustness. |
| MTCH6302-I/SS | Standalone touch controller (no MCU core), 28-channel max, fixed-function firmware, 28-pin SSOP. | Requires external host MCU for gesture processing; unsuitable for standalone HMI with local UI logic. | Choose for simple button/slider overlays where host processor handles all higher-level logic. |
Compared with CY8C40468-LQI and MTCH6302-I/SS, CYAT81688-100AS61KHT uniquely integrates ARM-based programmability, full environmental resilience, and scalable channel architecture-enabling single-chip HMI solutions without host dependency or performance trade-offs.
Availability
CYAT81688-100AS61KHT is available at Aetrix Electronics and suitable for industrial HMIs, medical diagnostic devices, automotive infotainment systems, and smart building control panels requiring stable component supply across extended product lifecycles.
Supply support for CYAT81688-100AS61KHT 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 belongs to the TrueTouch Gen5 family, designed specifically for high-reliability capacitive touch applications demanding environmental resilience, firmware flexibility, and seamless integration into safety-critical embedded systems.
FAQ
What is the maximum supported touchscreen size for CYAT81688-100AS61KHT?
The device supports up to 10-inch diagonal touchscreens using its 32×32 mutual-capacitance matrix configuration. Physical size depends on electrode pitch and overlay thickness; typical implementations achieve 1000×600 resolution with 0.5 mm trace spacing and 1 mm glass overlay. Layout guidelines in Infineon Application Note AN92239 specify trace impedance limits and guard ring requirements.
Does CYAT81688-100AS61KHT support I²C multi-master configurations?
Yes, it supports I²C multi-master operation with clock stretching and arbitration recovery. The device implements standard I²C protocol compliance including START/STOP condition detection, address matching, and ACK/NACK generation. Arbitration is resolved automatically per I²C specification, and bus recovery time is configurable via firmware register settings.
Can the onboard ARM Cortex-M0+ execute custom algorithms beyond touch processing?
Yes, the 256 KB flash and 32 KB SRAM allow implementation of custom sensor fusion, communication protocol stacks (e.g., CAN FD gateway), or local UI rendering logic. Example projects in PSoC Creator demonstrate BLE HID bridge and Modbus RTU slave functionality co-resident with touch firmware.
What certifications does CYAT81688-100AS61KHT hold for medical applications?
The part meets IEC 60601-1 edition 3.1 requirements for electrical safety and EMC in Class B medical devices. It is certified to EN 61000-4-3 (radiated immunity), EN 61000-4-6 (conducted immunity), and ISO 10993-5 (cytotoxicity) when used with Infineon-recommended PCB layout and enclosure materials.
CYAT81688-100AS61KHT 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)
CYAT81688-100AS61KHT FAQ
1.How can I place an order for CYAT81688-100AS61KHT through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81688-100AS61KHT 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 CYAT81688-100AS61KHT reliable?
The price and inventory of CYAT81688-100AS61KHT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81688-100AS61KHT is usually 5 days.
3.What payment methods are accepted for CYAT81688-100AS61KHT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81688-100AS61KHT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81688-100AS61KHT?
CYAT81688-100AS61KHT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81688-100AS61KHT 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 CYAT81688-100AS61KHT?
For technical support, including CYAT81688-100AS61KHT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81688-100AS61KHT requirements.
6.How does Aetrix verify that CYAT81688-100AS61KHT is sourced from the original manufacturer or authorized distributors?
All CYAT81688-100AS61KHT 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 CYAT81688-100AS61KHT meets industry standards.
7.What is the process for return or replacement of CYAT81688-100AS61KHT?
All CYAT81688-100AS61KHT units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81688-100AS61KHT, 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 CYAT81688-100AS61KHT part is unused and in its original packaging.
Return procedure for CYAT81688-100AS61KHT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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