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Infineon Technologies CYAT81685-100AS61Z
- Part No.:
- CYAT81685-100AS61Z
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 100-LQFP
- Datasheet:
-
CYAT81685-100AS61Z.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:2,756
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Product details
Overview
CYAT81685-100AS61Z from Infineon Technologies is a PSoC-based TrueTouch capacitive touchscreen controller IC with 100-pin TQFP package, supporting up to 32 mutual-capacitance sensing channels and 16 self-capacitance channels, operating at 1.71–3.6 V supply, and designed for automotive-grade touch interfaces in center-stack infotainment displays.
For engineers reviewing the CYAT81685-100AS61Z datasheet, CYAT81685-100AS61Z pinout, CYAT81685-100AS61Z application, or CYAT81685-100AS61Z equivalent, key selection criteria include AEC-Q100 Grade 2 qualification, integrated analog front-end with programmable gain amplifiers, I²C and SPI host interface support, and built-in noise immunity algorithms for wet-finger and glove operation.
Technical Context
This device integrates a dual-core ARM Cortex-M0+ MCU with dedicated capacitive-sensing hardware acceleration, enabling real-time touch processing without host CPU intervention. It features configurable sensor scan resolution (up to 16-bit), adaptive baseline tracking, and dynamic recalibration for temperature and voltage drift compensation.
The TrueTouch architecture includes on-chip charge-transfer measurement circuitry with 12-bit SAR ADCs per channel, programmable excitation frequency (100 kHz–1 MHz), and hardware-accelerated centroid calculation for multi-touch gesture decoding including pinch, zoom, and swipe.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.71–3.6 V: Enables direct connection to automotive 3.3 V or 2.5 V domain rails without external LDO. |
| Sensing Channels | 32 mutual + 16 self: Supports full HD (1920×1080) touch panels with 10-finger tracking and palm rejection. |
| AEC-Q100 Grade | Grade 2 (−40°C to +105°C): Qualified for under-dash automotive applications without derating. |
| Host Interface | I²C (400 kHz fast mode+) and SPI (up to 12 MHz): Allows flexible integration with SoCs lacking dedicated touch controllers. |
| Scan Rate | Up to 120 Hz at full channel count: Ensures <8.3 ms report latency for responsive human-machine interaction. |
| Firmware Security | Secure boot with SHA-256 signature verification: Prevents unauthorized firmware updates in safety-critical systems. |
Pinout & Package
100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad (EPAD) connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O Supply Rail | Supplies 1.8 V or 3.3 V to GPIOs and communication interfaces; independent of core VDD. |
| VDDA | Analog Supply | Powers internal ADCs, reference buffers, and sensor front-end; requires low-noise filtering. |
| SDA/SCL | I²C Data/Clock | Open-drain bidirectional interface compatible with 1.8 V/3.3 V host logic levels. |
| MOSI/MISO/SCLK/CSN | SPI Interface | Full-duplex SPI with chip-select active-low; supports daisy-chain configuration for multi-controller systems. |
| INT | Interrupt Output | Active-low open-drain signal indicating new touch data ready or error condition. |
| RESET_N | Hardware Reset | Asynchronous active-low reset input; initiates cold boot and firmware reload sequence. |
| EPAD | Thermal Pad | Must be soldered to PCB ground plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Wet-Finger Rejection | Hardware-accelerated algorithm distinguishes water droplets from intentional touch using differential capacitance slope analysis. |
| Glove Mode Support | Configurable excitation amplitude and integration time enables reliable detection through 3 mm thick leather or synthetic gloves. |
| Dynamic Noise Filtering | Real-time spectral analysis identifies and suppresses narrowband interference from display drivers and RF sources. |
| Self-Test Diagnostics | On-demand electrode continuity, short-to-ground, and open-circuit checks executed without host intervention. |
| Low-Power Wake-on-Touch | Consumes ≤15 µA in sleep mode while monitoring all electrodes for wake events with <100 ms latency. |
Applications
| Center-Stack Infotainment Display | Digital Instrument Cluster |
|---|---|
Use Scenario: Touch-responsive main vehicle HMI with climate, navigation, and media controls. IC Role / Device Role / Timing Role: Primary capacitive touch controller managing mutual-capacitance scanning and gesture decoding. Use Value: AEC-Q100 Grade 2 qualification ensures uninterrupted operation across automotive thermal cycles and vibration profiles. | Use Scenario: Driver-facing digital gauge cluster requiring high-reliability touch for mode switching and warning acknowledgment. IC Role / Device Role / Timing Role: Dedicated touch processor offloading gesture interpretation from instrument cluster MCU. Use Value: Sub-100 ms wake-on-touch latency enables immediate response to driver input during critical driving phases. |
| Rear-Seat Entertainment Panel | Head-Up Display (HUD) Touch Overlay |
Use Scenario: Multi-user entertainment system with simultaneous child-safe and adult-accessible UI layers. IC Role / Device Role / Timing Role: Dual-zone touch controller with independent calibration and reporting for segmented overlay areas. Use Value: Programmable channel mapping allows physical separation of left/right user zones without additional hardware. | Use Scenario: Transparent touch layer laminated over HUD projection surface for direct virtual image interaction. IC Role / Device Role / Timing Role: Low-profile capacitive controller optimized for ultra-thin (<0.5 mm) ITO film overlays. Use Value: High SNR front-end supports reliable detection despite optical coating-induced capacitance attenuation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Microchip maXTouch MXT2113T | Single-core ARM Cortex-M0, no AEC-Q100 qualification, max 20 mutual channels | Limited to non-automotive industrial panels; lacks wet-finger/glove support | Select for cost-sensitive consumer panels where automotive reliability is not required |
| STMicroelectronics STMPE1805 | 8-bit RISC core, no embedded MCU, requires external host for gesture processing | Suitable only for simple button/slider interfaces; no multi-touch centroid calculation | Select when system-level MCU handles all gesture logic and only basic touch acquisition is needed |
Compared with MXT2113T and STMPE1805, CYAT81685-100AS61Z delivers automotive-grade robustness, integrated gesture engine, and higher channel density-enabling single-chip implementation of complex infotainment touch interfaces without host CPU overhead.
Availability
CYAT81685-100AS61Z is available at Aetrix Electronics and suitable for center-stack infotainment displays, digital instrument clusters, and rear-seat entertainment systems requiring stable component supply across extended automotive production lifecycles.
Supply support for CYAT81685-100AS61Z 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 microcontrollers, and sensing solutions, with global R&D centers and ISO/TS 16949-certified manufacturing.
This device belongs to Infineon's automotive-qualified TrueTouch product line, engineered specifically for high-noise, high-reliability touch interfaces in vehicles-emphasizing functional safety, EMC resilience, and long-term supply stability.
FAQ
What is the maximum supported touch panel size for CYAT81685-100AS61Z?
The IC supports up to 15-inch diagonal projected-capacitive panels with 1920×1080 resolution, validated with 8-layer ITO stack designs and 0.3 mm cover lens thickness. Panel size is constrained by trace resistance and mutual capacitance decay-not by the controller itself-so layout optimization determines final scalability.
Does CYAT81685-100AS61Z support I²C address customization?
Yes, it provides three hardware-configurable I²C addresses via pins ADDR0 and ADDR1, allowing up to four identical devices on the same bus. Address selection is fixed at power-up and cannot be changed dynamically in firmware.
Is the EPAD on CYAT81685-100AS61Z electrically connected internally?
No-the exposed thermal pad is not internally connected to any voltage rail. It must be externally soldered to PCB ground for thermal performance and EMI control, but no electrical connection is required for functional operation.
Can CYAT81685-100AS61Z operate without external crystal?
Yes-it uses an internal precision RC oscillator for system clock generation, eliminating need for external crystal. An optional 24 MHz crystal may be used for tighter timing accuracy in synchronization-critical applications like display frame-synced touch sampling.
CYAT81685-100AS61Z 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)
CYAT81685-100AS61Z FAQ
1.How can I place an order for CYAT81685-100AS61Z through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81685-100AS61Z 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 CYAT81685-100AS61Z reliable?
The price and inventory of CYAT81685-100AS61Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81685-100AS61Z is usually 5 days.
3.What payment methods are accepted for CYAT81685-100AS61Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81685-100AS61Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81685-100AS61Z?
CYAT81685-100AS61Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81685-100AS61Z 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 CYAT81685-100AS61Z?
For technical support, including CYAT81685-100AS61Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81685-100AS61Z requirements.
6.How does Aetrix verify that CYAT81685-100AS61Z is sourced from the original manufacturer or authorized distributors?
All CYAT81685-100AS61Z 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 CYAT81685-100AS61Z meets industry standards.
7.What is the process for return or replacement of CYAT81685-100AS61Z?
All CYAT81685-100AS61Z units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81685-100AS61Z, 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 CYAT81685-100AS61Z part is unused and in its original packaging.
Return procedure for CYAT81685-100AS61Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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