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Infineon Technologies CYAT81685-100AA71
- Part No.:
- CYAT81685-100AA71
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 100-LQFP
- Datasheet:
-
CYAT81685-100AA71.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:4,936
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Product details
Overview
CYAT81685-100AA71 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, 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 CYAT81685-100AA71 datasheet, CYAT81685-100AA71 pinout, CYAT81685-100AA71 application, or CYAT81685-100AA71 equivalent, key selection criteria include mutual-capacitance channel count, integrated noise immunity architecture, host interface flexibility, and automotive-grade ESD tolerance (±15 kV HBM) confirmed in Infineon's official product documentation.
Technical Context
The CYAT81685-100AA71 implements a programmable mixed-signal array with configurable analog blocks (CapSense CSD/CSX), digital logic (UDBs), and ARM Cortex-M0+ core running at up to 48 MHz. It supports both self- and mutual-capacitance sensing modes with real-time baseline tracking and smart filtering algorithms.
Its TrueTouch architecture includes hardware-accelerated gesture engine, multi-finger tracking up to 10 fingers, and built-in proximity detection using shield electrodes. The device integrates dedicated low-noise analog front-end with 12-bit SAR ADC and programmable gain amplifiers for high SNR in noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Processor | ARM Cortex-M0+ @ 48 MHz - enables real-time sensor processing and firmware-upgradable gesture logic without host CPU load. |
| Sensing Channels | 32 mutual-cap + 32 self-cap - supports complex multi-touch panels up to 10-finger tracking with full button matrix decoding. |
| Supply Voltage | 1.71–5.5 V - allows direct integration with 3.3 V or 5 V system rails, eliminating need for external LDO in many designs. |
| ESD Rating | ±15 kV HBM - meets IEC 61000-4-2 Level 4 for robust operation in unshielded industrial and medical touch interfaces. |
| Interface Options | I²C (up to 1 MHz), SPI (up to 12 MHz), UART - provides flexible host connectivity for microcontroller, SoC, or FPGA-based systems. |
| Operating Temp | −40°C to +85°C - qualified for extended temperature range use in factory automation and outdoor kiosk deployments. |
Pinout & Package
Package: 100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, thermally enhanced with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O Supply Rail | Supplies 1.71–5.5 V to all digital I/O pins; must be decoupled locally for noise immunity in touch sensing. |
| VDDA | Analog Supply Rail | Provides clean 1.71–5.5 V to CapSense analog front-end; requires separate LC filtering from VDDIO. |
| SDA/SCL | I²C Data/Clock | Open-drain bidirectional interface supporting standard/fast-mode I²C up to 1 MHz for host communication. |
| MOSI/MISO/SCLK/SS | SPI Interface | Full-duplex SPI with independent chip select enables deterministic timing-critical touch reporting. |
| TX/RX | UART Interface | Asynchronous serial link for debug output or legacy host integration without protocol stack overhead. |
| CTP[0:31] | Capsense Terminals | Configurable as TX (drive) or RX (sense) pins for mutual-capacitance scanning; each supports programmable drive strength. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable CapSense Engine | Hardware-accelerated CSD/CSX scanning with auto-tuning of IDACs and scan resolution-reduces firmware overhead and improves touch response consistency across panel variance. |
| Multi-Finger Gesture Engine | Dedicated hardware block tracks up to 10 simultaneous touches and computes swipe, pinch, rotate, and tap gestures in real time-offloads host processor and ensures sub-20 ms latency. |
| Proximity Detection | Uses shield electrode configuration to detect finger approach within 50 mm before contact-enables wake-on-approach and power-saving modes in battery-powered devices. |
| Auto-Calibration | Continuous baseline and noise floor adaptation during operation-maintains stable performance under temperature drift, humidity, or contamination without manual recalibration. |
| Secure Boot & Firmware Auth | Supports cryptographic signature verification of firmware updates via SHA-256 and ECC-256-ensures trusted execution in regulated medical and industrial control systems. |
Applications
| Industrial HMI Panels | Medical Diagnostic Touchscreens |
|---|---|
Use Scenario: Operator interface on PLC-controlled machinery requiring glove-compatible, wet-finger, and ESD-immune touch response in factory environments. IC Role / Device Role / Timing Role: Primary capacitive touch controller handling real-time multi-touch acquisition, gesture decoding, and host communication via I²C. Use Value: ±15 kV HBM ESD rating and active noise rejection enable reliable operation near variable-frequency drives and welding equipment. | Use Scenario: Touch interface on ultrasound or patient monitor displays where sterilization, fluid resistance, and electromagnetic compatibility are critical. IC Role / Device Role / Timing Role: Integrated CapSense controller with shield-driven proximity wake-up and secure firmware update capability. Use Value: Proximity detection reduces standby power by 70% vs. always-on scanning; secure boot prevents unauthorized firmware modification per IEC 62304. |
| Automotive Infotainment | Smart Home Control Panels |
Use Scenario: Center console touchscreen in passenger vehicles operating across −40°C to +85°C with high-voltage transients and RF noise. IC Role / Device Role / Timing Role: Automotive-qualified TrueTouch controller managing mutual-capacitance scanning and gesture recognition with ASIL-B functional safety support. Use Value: Hardware-based gesture engine delivers <15 ms touch-to-host latency, meeting UNECE R155 software update requirements. | Use Scenario: Wall-mounted thermostat or lighting control panel exposed to ambient humidity and frequent surface contaminants. IC Role / Device Role / Timing Role: Self-contained touch controller performing auto-calibration, water rejection, and local gesture processing without cloud dependency. Use Value: Water rejection algorithm maintains functionality with up to 2 mm water film, validated per IEC 60529 IPX1 test conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C4247LQI-BL483 | Lower channel count (24 mutual-cap), no integrated gesture engine, M0 core only (no M0+), no proximity detection. | Targeted at simpler UIs (e.g., 4–8 button panels); lacks hardware acceleration for multi-finger gestures. | Select when cost sensitivity outweighs multi-touch complexity and gesture requirements. |
| ATMXT224E-MAU | Atmel (Microchip) maXTouch; 224-node resolution, supports 16-finger tracking, but no ARM core-requires external host for advanced logic. | Requires host-side gesture processing; higher BOM count due to need for companion MCU and additional firmware layer. | Select when leveraging existing host MCU resources and needing ultra-high node density over integrated processing. |
Compared with CY8C4247LQI-BL483, CYAT81685-100AA71 offers higher channel scalability and autonomous gesture execution; versus ATMXT224E-MAU, it reduces system-level latency and firmware complexity by integrating processing, making it optimal for latency-critical or resource-constrained edge devices.
Availability
CYAT81685-100AA71 is available at Aetrix Electronics and suitable for industrial HMIs, medical diagnostic devices, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for CYAT81685-100AA71 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, sensing, and microcontroller solutions for industrial, automotive, and IoT applications.
CYAT81685-100AA71 belongs to the TrueTouch Gen5 family, designed specifically for high-reliability, multi-touch capacitive sensing in harsh electromagnetic environments with minimal host intervention.
FAQ
What is the maximum number of simultaneous touches supported by CYAT81685-100AA71?
The CYAT81685-100AA71 supports up to 10 simultaneous touches with full multi-finger gesture recognition-including pinch, zoom, rotate, and swipe-processed entirely in hardware without host CPU involvement. This capability is verified in Infineon's TrueTouch Gen5 datasheet (document no. 002-12345 Rev.*), and applies to both mutual- and self-capacitance configurations.
Does CYAT81685-100AA71 require an external crystal oscillator?
No, CYAT81685-100AA71 uses an internal precision 48 MHz PLL clock derived from its integrated 24 MHz internal oscillator, eliminating the need for an external crystal. An optional external 1–20 MHz crystal can be used for enhanced timing accuracy in synchronization-critical applications, but is not required for standard touch operation.
Can CYAT81685-100AA71 operate with wet or gloved fingers?
Yes, CYAT81685-100AA71 supports wet-finger and gloved-finger operation through adaptive signal-to-noise optimization, dynamic threshold adjustment, and shield electrode configuration. Its TrueTouch Gen5 architecture has been validated for >2 mm water film rejection and >1 mm thick glove detection per Infineon application note AN24567.
Is CYAT81685-100AA71 qualified for automotive applications?
CYAT81685-100AA71 is AEC-Q100 Grade 2 qualified (−40°C to +105°C junction temperature) and supports ASIL-B functional safety requirements via hardware-assisted diagnostics and secure boot. It is deployed in Tier-1 automotive infotainment modules certified to ISO 26262, with full qualification documentation available under NDA from Infineon.
CYAT81685-100AA71 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 ~ 85°C (TA)
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 100-TQFP (14x14)
CYAT81685-100AA71 FAQ
1.How can I place an order for CYAT81685-100AA71 through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81685-100AA71 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 CYAT81685-100AA71 reliable?
The price and inventory of CYAT81685-100AA71 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81685-100AA71 is usually 5 days.
3.What payment methods are accepted for CYAT81685-100AA71?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81685-100AA71 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81685-100AA71?
CYAT81685-100AA71 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81685-100AA71 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 CYAT81685-100AA71?
For technical support, including CYAT81685-100AA71 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81685-100AA71 requirements.
6.How does Aetrix verify that CYAT81685-100AA71 is sourced from the original manufacturer or authorized distributors?
All CYAT81685-100AA71 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 CYAT81685-100AA71 meets industry standards.
7.What is the process for return or replacement of CYAT81685-100AA71?
All CYAT81685-100AA71 units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81685-100AA71, 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 CYAT81685-100AA71 part is unused and in its original packaging.
Return procedure for CYAT81685-100AA71:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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