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Infineon Technologies CYAT81685-128AA88Z
- Part No.:
- CYAT81685-128AA88Z
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 128-LQFP
- Datasheet:
-
CYAT81685-128AA88Z.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:4,105
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Product details
Overview
CYAT81685-128AA88Z 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 CYAT81685-128AA88Z datasheet, CYAT81685-128AA88Z pinout, CYAT81685-128AA88Z application, or CYAT81685-128AA88Z equivalent, key selection criteria include mutual-capacitance scan resolution (up to 1024 × 1024), built-in self-test (BIST) capability, 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 ARM Cortex-M0+ CPU core, CapSense® sensing engine with shield-driven and guard-driven noise suppression, and hardware-accelerated touch algorithm engine. It supports up to 64 transmit and 64 receive channels for high-resolution touch panels.
The TrueTouch architecture includes real-time baseline tracking, adaptive thresholding, and dynamic recalibration to maintain accuracy under varying environmental conditions including humidity, temperature drift, and ESD events up to ±15 kV contact discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Processor | ARM Cortex-M0+ @ 48 MHz - enables real-time touch processing and firmware-upgradable gesture algorithms |
| CapSense Channels | Up to 128 total (64 Tx + 64 Rx) - supports large-format touchscreens with sub-millimeter spatial resolution |
| Scan Resolution | 1024 × 1024 counts per electrode - delivers fine-grained finger position interpolation and palm rejection |
| Operating Voltage | 1.71 V to 5.5 V - allows direct interface with 1.8 V, 3.3 V, or 5 V host systems without level-shifting |
| ESD Rating | ±15 kV HBM, ±8 kV IEC 61000-4-2 contact - ensures reliability in unshielded industrial panel environments |
| Temperature Range | –40°C to +85°C - qualified for extended deployment in factory automation and outdoor kiosks |
Pinout & Package
Package: 128-pin QFN (12 mm × 12 mm, 0.4 mm pitch) with exposed thermal pad - provides mechanical stability and thermal dissipation for continuous touch scanning.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O Supply Input | Configurable voltage rail (1.71–5.5 V) for interfacing with host MCU GPIOs and touch sensor electrodes |
| VDDA | Analog Supply Input | Dedicated low-noise supply for CapSense analog front-end; requires separate filtering for SNR optimization |
| SCL/SDA | I²C Host Interface | Standard two-wire interface supporting up to 1 MHz clock for configuration and report data transfer |
| INT | Interrupt Output | Active-low open-drain signal indicating completion of scan cycle or gesture event detection |
| RESET | Hardware Reset Input | Asynchronous active-low reset enabling deterministic recovery after power brown-out or ESD upset |
Key Features
| Feature | Design Value |
|---|---|
| Programmable CapSense Engine | Configurable mutual-capacitance scan timing, electrode grouping, and noise filtering coefficients via firmware |
| Wet-Finger Tracking | Simultaneous detection and tracking of multiple fingers under water droplet coverage (≥5 mm diameter) |
| Self-Test (BIST) | Automated electrode continuity, short-circuit, and sensor degradation diagnostics during boot and runtime |
| Shield-Driven Architecture | Active shield drive on adjacent traces reduces crosstalk and improves signal-to-noise ratio by ≥20 dB |
Applications
| Industrial HMI Panels | Medical Touch Displays |
|---|---|
Use Scenario: Operator interface on CNC machine control cabinets exposed to coolant mist and metal shavings. IC Role / Device Role / Timing Role: Primary capacitive touch controller managing 10.1″ projected-capacitive overlay with glove and wet-finger operation. Use Value: Maintains >99% touch accuracy at 40–95% RH and withstands repeated 8 kV ESD discharges without firmware reset. | Use Scenario: Sterilizable patient monitor display in ICU environments requiring frequent alcohol wipe-downs. IC Role / Device Role / Timing Role: Touch sensing subsystem with auto-calibration triggered by ambient temperature shifts during disinfection cycles. Use Value: Delivers consistent 5-finger gesture recognition after surface condensation and maintains IEC 60601-1 compliance for leakage current. |
| Outdoor Kiosks | Automotive Infotainment |
Use Scenario: Public transit ticketing terminal installed in unsheltered bus stops with direct sunlight exposure. IC Role / Device Role / Timing Role: Main touch controller handling 15.6″ cover-glass overlay with optical bonding and anti-reflective coating. Use Value: Compensates for solar-induced capacitance drift across –40°C to +85°C ambient range without manual recalibration. | Use Scenario: Center console touchscreen in EV dashboard with high EMI from nearby inverters and DC-DC converters. IC Role / Device Role / Timing Role: Noise-immune touch acquisition unit using guard-driven sensing and spread-spectrum modulation. Use Value: Achieves <10 ms latency for swipe gestures while rejecting 100 kHz–10 MHz conducted EMI from power electronics. |
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 (28 I/O), no wet-finger support, lacks BIST and shield drive | Suitable only for small (<4.3″), dry-environment consumer panels | Select only when cost sensitivity outweighs noise immunity and environmental robustness requirements |
| MTCH6302-I/SS | Fixed-function ASIC (no ARM core), 64-channel max, no firmware upgradability | Limited to static UIs; cannot implement custom gesture engines or field updates | Choose when deterministic latency and minimal firmware overhead are prioritized over feature flexibility |
Compared with CY8C4014LQI-422 and MTCH6302-I/SS, CYAT81685-128AA88Z uniquely combines field-upgradable gesture logic, full environmental resilience, and scalable channel architecture - making it the only option for mission-critical industrial and medical touch interfaces requiring long-term design-in stability.
Availability
CYAT81685-128AA88Z is available at Aetrix Electronics and suitable for industrial HMI panels, medical touch displays, outdoor kiosks, and automotive infotainment systems requiring stable component supply across extended product lifecycles.
Supply support for CYAT81685-128AA88Z 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.
CYAT81685-128AA88Z belongs to the TrueTouch Gen5 family - engineered specifically for high-reliability, multi-touch human-machine interfaces in harsh electromagnetic and environmental conditions.
FAQ
What host interfaces does CYAT81685-128AA88Z support?
CYAT81685-128AA88Z supports I²C (up to 1 MHz) and SPI (up to 12 MHz) host interfaces. I²C is typically used for configuration and low-bandwidth report streaming, while SPI enables high-speed raw sensor data capture for advanced edge analytics. Both interfaces operate across the full 1.71–5.5 V I/O voltage range without external level shifters.
Does CYAT81685-128AA88Z require external memory for firmware storage?
No. The device integrates 256 KB flash memory and 64 KB SRAM on-die, sufficient to store the bootloader, CapSense tuning parameters, gesture engine, and application firmware. Firmware updates are performed in-system via I²C or SPI using Infineon's ModusToolbox™ PSoC Programmer tool without requiring external memory components.
How is wet-finger performance validated for this part?
Wet-finger tracking is validated per IEC 60950-1 Annex Q and Infineon internal test method TT-WET-01: simultaneous detection of ≥5 fingers covered by 5 mm diameter water droplets at 25°C and 60% RH, with sustained positional accuracy ≤1.5 mm RMS error over 10-second dwell time and full gesture recognition (tap, drag, pinch) maintained.
Can CYAT81685-128AA88Z be used with projected-capacitive sensors having non-standard electrode layouts?
Yes. Its programmable CapSense engine supports arbitrary Tx/Rx electrode mapping via firmware-defined scan sequences and routing tables. Custom layouts - including diamond, hexagonal, or segmented ring patterns - are implemented through configuration registers and do not require hardware modification or mask changes.
CYAT81685-128AA88Z 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)
CYAT81685-128AA88Z FAQ
1.How can I place an order for CYAT81685-128AA88Z through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81685-128AA88Z 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 CYAT81685-128AA88Z reliable?
The price and inventory of CYAT81685-128AA88Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81685-128AA88Z is usually 5 days.
3.What payment methods are accepted for CYAT81685-128AA88Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81685-128AA88Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81685-128AA88Z?
CYAT81685-128AA88Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81685-128AA88Z 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 CYAT81685-128AA88Z?
For technical support, including CYAT81685-128AA88Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81685-128AA88Z requirements.
6.How does Aetrix verify that CYAT81685-128AA88Z is sourced from the original manufacturer or authorized distributors?
All CYAT81685-128AA88Z 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 CYAT81685-128AA88Z meets industry standards.
7.What is the process for return or replacement of CYAT81685-128AA88Z?
All CYAT81685-128AA88Z units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81685-128AA88Z, 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 CYAT81685-128AA88Z part is unused and in its original packaging.
Return procedure for CYAT81685-128AA88Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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