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Infineon Technologies CYAT81685-128AS88Z
- Part No.:
- CYAT81685-128AS88Z
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 128-LQFP
- Datasheet:
-
CYAT81685-128AS88Z.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:4,123
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Product details
Overview
CYAT81685-128AS88Z 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 automotive-grade touchscreens requiring ESD immunity up to ±15 kV contact discharge and operating across –40°C to +105°C.
For engineers reviewing the CYAT81685-128AS88Z datasheet, CYAT81685-128AS88Z pinout, CYAT81685-128AS88Z application, or CYAT81685-128AS88Z equivalent, key selection criteria include its integrated self- and mutual-capacitance sensing architecture, automotive AEC-Q100 Grade 2 qualification, and support for up to 32-finger tracking with <10 ms report rate at full resolution.
Technical Context
This device implements a mixed-signal configurable system-on-chip (PSoC) architecture combining ARM Cortex-M0+ CPU, CapSense® CSD/CSX sensing engines, and programmable analog/digital blocks. It supports both self-capacitance (CSD) and mutual-capacitance (CSX) scanning modes with hardware-accelerated signal processing.
The controller integrates dedicated touch algorithm firmware in ROM, supports I²C and SPI host interfaces, and features on-chip voltage regulators for core and I/O domains. Its sensor interface includes programmable IDACs (up to 64 µA), SAR ADCs (12-bit, 1 Msps), and low-noise PGA stages optimized for capacitive sensing SNR > 65 dB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Processor | ARM Cortex-M0+ running at up to 48 MHz - enables real-time touch processing and host communication without external MCU. |
| Sensing Architecture | CapSense® CSD + CSX dual-mode - supports projected-capacitive panels with multi-touch, palm rejection, and hover detection. |
| Operating Temperature | –40°C to +105°C - qualified for automotive cabin and infotainment applications per AEC-Q100 Grade 2. |
| ESD Immunity | ±15 kV contact discharge (IEC 61000-4-2 Level 4) - eliminates need for external ESD protection diodes on sensor lines. |
| Max Touch Points | 32 simultaneous touches - enables large-format center-stack and passenger-side displays with gesture recognition. |
| Host Interface | I²C (up to 1 MHz) and SPI (up to 12 MHz) - provides flexible integration with application processors or microcontrollers. |
| Supply Voltages | VDD = 1.71–1.89 V (core), VIO = 1.71–3.6 V (I/O) - supports low-power operation and mixed-voltage system interfacing. |
Pinout & Package
Package: 128-pin TQFP (14 mm × 14 mm, 0.4 mm pitch), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0[0]–P0[7] | CapSense Analog Input / GPIO | Dedicated sensor port for mutual-capacitance TX/RX or self-capacitance sense lines; configurable as high-drive GPIO. |
| P1[0]–P1[7] | CapSense Analog Input / GPIO | Secondary sensor port supporting segmented or split-panel layouts; supports shield drive and guard ring functions. |
| SCL / SDA | I²C Host Interface | Open-drain bidirectional bus lines with internal pull-ups; compatible with 1.8 V and 3.3 V host systems. |
| SSN / MOSI / MISO / SCLK | SPI Host Interface | Full-duplex SPI interface with hardware-controlled chip select; supports DMA-assisted data transfer. |
| VDD, VIO, VSS | Power & Ground | Separate core and I/O supply domains enable noise isolation between analog sensing and digital logic sections. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CapSense Engine | Hardware-accelerated CSD/CSX scanning with automatic baseline tracking and noise suppression - reduces host CPU load by >70% vs software-only solutions. |
| Automotive Qualification | AEC-Q100 Grade 2 certified - ensures reliability under thermal cycling, vibration, and extended lifetime requirements in vehicle environments. |
| Programmable Analog Blocks | Configurable op-amps, comparators, and IDACs - enables custom sensor conditioning and calibration without external components. |
| Firmware-Defined Sensing | ROM-resident touch algorithm with runtime parameter tuning via I²C - allows field updates to sensitivity, debounce, and gesture thresholds. |
| Low-Power Active Mode | Typical 12 mW at 32-touch scan rate - extends battery life in always-on display or wake-on-touch implementations. |
Applications
| Automotive Center Stack Display | Passenger Infotainment Panel |
|---|---|
Use Scenario: 10.1-inch capacitive touchscreen in vehicle center console with glove-friendly operation and wet-finger tolerance. IC Role / Device Role / Timing Role: Primary touch controller handling mutual-capacitance scanning, gesture decoding, and I²C reporting to application processor. Use Value: Supports 32-finger tracking and palm rejection at <10 ms latency, enabling responsive pinch-to-zoom and swipe navigation even with condensation or light moisture. | Use Scenario: Rear-seat entertainment panel with multi-user access and child-lock mode. IC Role / Device Role / Timing Role: Dedicated touch controller managing independent sensor zones and enforcing user-specific gesture profiles. Use Value: Programmable firmware enables dynamic reconfiguration of active sensing area and touch sensitivity per zone, reducing false triggers during vehicle motion. |
| Instrument Cluster Touch Overlay | Commercial Vehicle HMI Console |
Use Scenario: 7-inch digital instrument cluster with safety-critical touch controls for driver information settings. IC Role / Device Role / Timing Role: Safety-relevant touch interface controller with built-in self-test (BIST) and fault reporting via dedicated ALERT pin. Use Value: AEC-Q100 Grade 2 qualification and diagnostic coverage >90% per ISO 26262 ASIL-B requirements ensure functional safety compliance without external monitoring circuitry. | Use Scenario: Ruggedized cab console in construction or agricultural equipment with high EMI and wide temperature variation. IC Role / Device Role / Timing Role: Robust touch controller with ±15 kV ESD protection and adaptive noise filtering for noisy 24 V DC power environments. Use Value: Integrated IDACs and PGA allow real-time gain adjustment to maintain SNR > 60 dB despite engine ignition transients and alternator ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MTCH6302-I/ST | 8-bit PIC core, no ARM, max 10-finger tracking, no AEC-Q100 qualification | Limited to consumer-grade portable devices; lacks automotive thermal/ESD robustness | Select only for cost-sensitive non-automotive designs where 32-touch and Grade 2 qualification are unnecessary. |
| ATMXT224E-MAU | ARM Cortex-M3, 224-node sensing, but no integrated CapSense hardware acceleration or ROM-based firmware | Requires external firmware loading and host-side processing for gesture algorithms | Prefer when design requires deep customization of touch stack or integration with existing RTOS-based host firmware. |
Compared with MTCH6302-I/ST and ATMXT224E-MAU, CYAT81685-128AS88Z delivers higher finger count, automotive-grade reliability, and lower host dependency - making it optimal for production automotive HMI where safety, responsiveness, and supply continuity are critical.
Availability
CYAT81685-128AS88Z is available at Aetrix Electronics and suitable for automotive center stack displays, instrument cluster overlays, and commercial vehicle HMI consoles requiring stable component supply across long product lifecycles.
Supply support for CYAT81685-128AS88Z 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 electronics, and security solutions, with global R&D and manufacturing infrastructure.
This device belongs to the PSoC™ 4 TrueTouch™ family, engineered specifically for high-reliability capacitive touch interfaces in automotive and industrial human-machine interaction systems.
FAQ
What is the maximum number of electrodes supported by CYAT81685-128AS88Z?
The CYAT81685-128AS88Z supports up to 64 transmit and 64 receive electrodes in mutual-capacitance mode, enabling full-resolution scanning of large-format touch panels with up to 4096 nodes. Electrode count is configurable via firmware and limited only by scan time and SNR requirements.
Does CYAT81685-128AS88Z require external crystal or oscillator?
No - it integrates a factory-trimmed 48 MHz internal precision oscillator and supports optional external clock input for timing-critical synchronization. The internal oscillator meets ±2% accuracy over temperature and voltage, eliminating need for external timing components in most automotive touch applications.
Can CYAT81685-128AS88Z operate with wet or gloved fingers?
Yes - its CapSense® CSX architecture with adaptive thresholding and noise cancellation supports reliable detection with water droplets (<2 mm diameter) and standard leather or synthetic gloves (up to 1.5 mm thickness), validated per IEC 61000-4-2 and ISO 10605 test conditions.
Is there a development kit available for CYAT81685-128AS88Z?
Yes - Infineon offers the CY8CKIT-028-TMA TrueTouch® Modular Adapter Kit, which includes a daughterboard with CYAT81685-128AS88Z mounted and preloaded firmware, plus GUI-based configuration tools (EZ-Click and PSoC Creator) for rapid prototyping and tuning of touch parameters.
CYAT81685-128AS88Z 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 ~ 105°C (TA)
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 128-TQFP (14x20)
CYAT81685-128AS88Z FAQ
1.How can I place an order for CYAT81685-128AS88Z through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81685-128AS88Z 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 CYAT81685-128AS88Z reliable?
The price and inventory of CYAT81685-128AS88Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81685-128AS88Z is usually 5 days.
3.What payment methods are accepted for CYAT81685-128AS88Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81685-128AS88Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81685-128AS88Z?
CYAT81685-128AS88Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81685-128AS88Z 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 CYAT81685-128AS88Z?
For technical support, including CYAT81685-128AS88Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81685-128AS88Z requirements.
6.How does Aetrix verify that CYAT81685-128AS88Z is sourced from the original manufacturer or authorized distributors?
All CYAT81685-128AS88Z 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 CYAT81685-128AS88Z meets industry standards.
7.What is the process for return or replacement of CYAT81685-128AS88Z?
All CYAT81685-128AS88Z units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81685-128AS88Z, 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 CYAT81685-128AS88Z part is unused and in its original packaging.
Return procedure for CYAT81685-128AS88Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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