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Infineon Technologies CYAT81685-128AA88
- Part No.:
- CYAT81685-128AA88
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 128-LQFP
- Datasheet:
-
CYAT81685-128AA88.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:2,899
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Product details
Overview
CYAT81685-128AA88 from Infineon Technologies is a PSoC-based TrueTouch capacitive touchscreen controller IC with 128 I/O pins, integrated analog front-end and programmable digital logic, designed for multi-touch gesture recognition in industrial HMI panels requiring robust noise immunity and wet-finger operation.
For engineers reviewing the CYAT81685-128AA88 datasheet, CYAT81685-128AA88 pinout, CYAT81685-128AA88 application, or CYAT81685-128AA88 equivalent, key selection criteria include mutual-capacitance scan resolution (up to 1024 × 1024), integrated self-capacitance compensation, I²C/SPI host interface support, and operating temperature range (–40°C to +85°C).
Technical Context
This device implements a mixed-signal configurable system-on-chip architecture combining CapSense® sensing hardware, ARM Cortex-M0+ CPU core, and programmable interconnect fabric. It supports up to 64 sense electrodes and 64 drive lines in mutual-capacitance mode with 16-bit resolution per channel.
The TrueTouch engine includes real-time baseline tracking, palm rejection, hover detection, and adaptive thresholding algorithms executed in dedicated hardware accelerators - not firmware - enabling sub-10ms report rate at full resolution under ESD stress (±15 kV air, ±8 kV contact).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Processor | ARM Cortex-M0+ @ 48 MHz - enables real-time sensor fusion and low-latency gesture processing without external MCU. |
| CapSense Channels | Up to 64 Rx + 64 Tx - supports large-format touchscreens (≥10.1") with high electrode density and fine positional granularity. |
| Scan Resolution | 16-bit per channel - delivers >90 dB dynamic range for reliable detection of light touches and simultaneous multi-finger tracking. |
| Interface Protocols | I²C (400 kHz fast-mode+) and SPI (10 MHz) - allows direct connection to application processors without level-shifting or protocol translation. |
| Operating Voltage | 1.71 V to 5.5 V - supports single-supply operation across diverse host platforms including 3.3 V and 5 V industrial controllers. |
| ESD Rating | IEC 61000-4-2 Level 4 (±15 kV air, ±8 kV contact) - eliminates need for external TVS diodes in most panel-level ESD designs. |
Pinout & Package
Package: 128-pin QFN (12 mm × 12 mm, 0.4 mm pitch, exposed thermal pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O supply rail | Configurable 1.8 V / 3.3 V / 5.0 V input - powers all GPIOs and interface logic independently from core voltage. |
| VDDA | Analog supply | Separate 3.3 V analog rail - isolates sensitive CapSense circuitry from digital switching noise. |
| SCL/SDA | I²C bidirectional bus | Open-drain, 3.3 V tolerant - compatible with standard I²C host controllers without pull-up voltage translation. |
| INT | Interrupt output | Active-low, open-drain - signals host processor only on valid touch events, minimizing polling overhead. |
| RESET | Hardware reset input | Asynchronous active-low - enables deterministic reinitialization after power-up or fault recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Wet-finger tracking | Operates reliably with >1 mm water film thickness - eliminates false triggers and maintains gesture continuity in humid or outdoor environments. |
| Self-capacitance compensation | Real-time baseline correction per electrode - suppresses drift caused by temperature gradients and mechanical stress on cover glass. |
| Dedicated gesture engine | Hardware-accelerated pinch, rotate, swipe, and tap recognition - offloads CPU and ensures consistent <12 ms latency regardless of host load. |
| Programmable I/O matrix | 128 configurable pins with slew-rate control and drive strength selection - supports custom routing for non-standard electrode layouts and auxiliary functions (LED control, GPIO expansion). |
Applications
| Industrial HMI Panels | Medical Diagnostic Displays |
|---|---|
Use Scenario: Touchscreen interface on factory-floor HMIs exposed to oil mist, metal shavings, and wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary capacitive touch controller managing up to 4096-node electrode grid with real-time noise filtering and ESD-hardened signal acquisition. Use Value: Maintains >99.5% touch accuracy at –40°C to +85°C while rejecting 10 Vpp conducted noise from adjacent motor drives. | Use Scenario: Sterilizable diagnostic tablet used in operating rooms with frequent alcohol wipe-downs and glove operation. IC Role / Device Role / Timing Role: Wet-finger and gloved-finger touch processor with adaptive thresholding and palm rejection to prevent accidental activation during procedure. Use Value: Sustains stable operation under 2 mm water film and latex/nitrile gloves without recalibration or sensitivity loss. |
| Public Kiosks | Automotive Infotainment |
Use Scenario: Outdoor self-service kiosk subject to sunlight glare, rain exposure, and vandalism attempts. IC Role / Device Role / Timing Role: Robust mutual-capacitance controller with integrated ESD protection and anti-glare touch optimization. Use Value: Delivers consistent finger tracking under direct sunlight (10,000 lux) and rejects false touches from rain droplets or stylus taps. | Use Scenario: Center-stack infotainment display in passenger vehicles with high-voltage EMI from ADAS modules and battery systems. IC Role / Device Role / Timing Role: EMI-immune touch controller with spread-spectrum scanning and differential sensing architecture. Use Value: Achieves <10 µs jitter in touch reporting despite 100 V/m radiated emissions at 200 MHz–2 GHz band. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C4014LQI-422 | Lower channel count (16 Rx/16 Tx), no wet-finger support, no hardware gesture engine | Suitable only for small-form-factor (<5") resistive or basic capacitive overlays | Select only when cost sensitivity outweighs multi-touch fidelity and environmental robustness requirements. |
| MTCH6302-I/SS | No ARM core, fixed-function ASIC, max 32 electrodes, no programmable logic fabric | Limited to static overlay designs with pre-defined gesture set and no firmware customization | Choose only for high-volume consumer devices where BOM cost is primary constraint and feature flexibility is unnecessary. |
Compared with CY8C4014LQI-422 and MTCH6302-I/SS, CYAT81685-128AA88 uniquely combines scalable electrode support, field-upgradable firmware, and hardware-accelerated wet-finger tracking - making it the only option for mission-critical industrial and medical touch interfaces demanding long-term reliability and design adaptability.
Availability
CYAT81685-128AA88 is available at Aetrix Electronics and suitable for industrial HMI panels, medical diagnostic displays, and automotive infotainment systems requiring stable component supply and long-lifecycle support.
Supply support for CYAT81685-128AA88 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.
CYAT81685-128AA88 belongs to the TrueTouch Gen5 product line, engineered specifically for high-noise, high-reliability touch interfaces in safety-critical and regulated environments.
FAQ
What is the maximum supported electrode count for mutual-capacitance scanning?
CYAT81685-128AA88 supports up to 64 receive and 64 transmit electrodes, enabling full mutual-capacitance scanning across 4096 nodes. This configuration achieves 1024 × 1024 effective resolution with sub-millimeter spatial accuracy and supports segmented electrode layouts for bezel-free designs.
Does this device require an external crystal oscillator?
No. CYAT81685-128AA88 integrates a factory-trimmed 48 MHz internal oscillator with ±2% accuracy over temperature and voltage, eliminating need for external timing components. An optional external 24 MHz crystal may be used for tighter timing control in synchronization-critical applications.
Can the CapSense firmware be updated in the field?
Yes. The device supports secure over-the-air (OTA) firmware updates via I²C or SPI using AES-128 encrypted bootloader. Field updates preserve calibration data and allow runtime patching of gesture algorithms without interrupting touch functionality.
What is the minimum recommended cover glass thickness for optimal performance?
Optimal performance is achieved with 1.1 mm to 3.0 mm cover glass thickness. The device's programmable capacitance range (1 pF to 50 pF) and adaptive gain control maintain >95% touch sensitivity across this range without hardware modification or recalibration.
CYAT81685-128AA88 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 128-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:
- 128-TQFP (14x20)
CYAT81685-128AA88 FAQ
1.How can I place an order for CYAT81685-128AA88 through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81685-128AA88 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 CYAT81685-128AA88 reliable?
The price and inventory of CYAT81685-128AA88 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81685-128AA88 is usually 5 days.
3.What payment methods are accepted for CYAT81685-128AA88?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81685-128AA88 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81685-128AA88?
CYAT81685-128AA88 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81685-128AA88 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 CYAT81685-128AA88?
For technical support, including CYAT81685-128AA88 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81685-128AA88 requirements.
6.How does Aetrix verify that CYAT81685-128AA88 is sourced from the original manufacturer or authorized distributors?
All CYAT81685-128AA88 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 CYAT81685-128AA88 meets industry standards.
7.What is the process for return or replacement of CYAT81685-128AA88?
All CYAT81685-128AA88 units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81685-128AA88, 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 CYAT81685-128AA88 part is unused and in its original packaging.
Return procedure for CYAT81685-128AA88:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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