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Infineon Technologies CYAT81685-128AS88
- Part No.:
- CYAT81685-128AS88
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 128-LQFP
- Datasheet:
-
CYAT81685-128AS88.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:3,963
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Product details
Overview
CYAT81685-128AS88 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 high noise immunity and wet-finger operation.
For engineers reviewing the CYAT81685-128AS88 datasheet, CYAT81685-128AS88 pinout, CYAT81685-128AS88 application, or CYAT81685-128AS88 equivalent, key selection criteria include mutual-capacitance scan resolution (up to 1024 × 1024), built-in self-test (BIST) capability, I²C/SPI/USB 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, and programmable analog/digital blocks. It supports up to 64 transmit and 64 receive channels for true multi-touch tracking with <10ms report rate at full resolution.
The TrueTouch engine includes adaptive thresholding, palm rejection, hover detection, and active stylus support via dedicated analog front-end calibration registers. Firmware is field-upgradable via I²C or USB without external programmer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Processor | ARM Cortex-M0+ @ 48 MHz - enables real-time gesture processing and host communication stack execution |
| CapSense Channels | Up to 64 Tx / 64 Rx - supports large-format touchscreens (≥10.1") with >10 simultaneous touches |
| Scan Resolution | 1024 × 1024 - delivers sub-millimeter positional accuracy for precision UI navigation |
| Interface Options | I²C (400 kHz), SPI (12 MHz), USB 2.0 Full-Speed - allows flexible host integration without protocol translation |
| Operating Temp | –40°C to +85°C - qualified for industrial control panel deployment without derating |
| Supply Voltage | 1.71 V to 5.5 V - supports direct connection to 3.3 V or 5 V system rails without LDO |
Pinout & Package
Package: 128-pin TQFP (14 mm × 14 mm, 0.4 mm pitch) with exposed thermal pad - provides mechanical stability and thermal dissipation for continuous touch scanning in sealed enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O Supply Rail | Configurable 1.71–5.5 V input for driving touch sensor lines and interfacing with host MCU voltage domain |
| SDA/SCL | I²C Data/Clock | Open-drain bidirectional interface supporting standard/fast-mode I²C up to 400 kHz for low-pin-count host connection |
| MOSI/MISO/SCLK/SS | SPI Interface | Full-duplex 4-wire SPI at 12 MHz enables high-throughput firmware updates and raw scan data streaming |
| USB_DP/USB_DM | USB 2.0 Differential Pair | Integrated USB PHY eliminates need for external transceiver; supports HID-compliant touch reporting out-of-box |
| CTP[0:63] | CapSense TX/RX Terminals | Programmable GPIOs configured as mutual-capacitance drive or sense lines; each supports hardware-accelerated scanning |
Key Features
| Feature | Design Value |
|---|---|
| Wet-Finger Tracking | Operates reliably with >1 mm water film using dynamic baseline compensation and signal-to-noise ratio enhancement |
| Active Stylus Support | Dedicated analog channel configuration enables 256-level pressure sensitivity and tilt angle detection via resonant stylus coupling |
| Built-in Self-Test (BIST) | Automated open/short and capacitance drift verification during power-up and runtime without host intervention |
| Programmable Analog Blocks | Configurable op-amps, comparators, and ADCs allow custom sensor conditioning and proximity detection without external components |
Applications
| Industrial HMI Panel | Medical Diagnostic Display |
|---|---|
Use Scenario: Touchscreen interface on factory-floor PLC operator terminals exposed to EMI, dust, and occasional liquid ingress. IC Role / Device Role / Timing Role: Primary capacitive touch controller executing real-time gesture decoding and noise-adaptive scanning. Use Value: Wet-finger operation and >60 V/m conducted noise immunity ensure uninterrupted UI responsiveness in harsh environments. | Use Scenario: Sterilizable touchscreen on ultrasound or MRI console requiring glove and stylus operation. IC Role / Device Role / Timing Role: Multi-modal input processor handling simultaneous finger, passive stylus, and active stylus inputs with sub-5ms latency. Use Value: Integrated BIST and medical-grade EMC compliance reduce validation effort for IEC 60601-1-2 certification. |
| Public Kiosk Terminal | Automotive Infotainment |
Use Scenario: Outdoor-facing self-service kiosk subject to wide temperature swings and condensation. IC Role / Device Role / Timing Role: Main touch acquisition engine with automatic temperature-compensated baseline adjustment. Use Value: –40°C to +85°C operation and auto-calibration maintain touch accuracy across diurnal ambient shifts. | Use Scenario: Center-stack display in passenger vehicles with high-voltage EMI from ADAS modules. IC Role / Device Role / Timing Role: Isolated touch controller communicating via shielded I²C to infotainment SoC. Use Value: Dedicated noise-rejection algorithms suppress 100–200 MHz switching noise from DC-DC converters without shielding overlay. |
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 (32 I/O), no USB PHY, max 500 × 500 scan resolution | Suitable for small-form-factor (<7") displays with basic tap/swipe gestures only | Select when cost sensitivity outweighs multi-touch fidelity and wet-finger robustness |
| MT4100-128-QFN | Dedicated ASIC (no programmable CPU), fixed firmware, 128-pin QFN package | Limited to pre-defined gesture sets; no field firmware update capability | Choose for high-volume consumer devices where feature lock-in and BOM reduction are prioritized |
Compared with CY8C4247LQI-BL483 and MT4100-128-QFN, CYAT81685-128AS88 uniquely combines field-upgradable firmware, wet-finger resilience, and USB HID compliance-enabling one platform to serve industrial, medical, and automotive UI requirements without hardware revision.
Availability
CYAT81685-128AS88 is available at Aetrix Electronics and suitable for industrial HMI panels, medical diagnostic displays, and public kiosk terminals requiring stable component supply and long-term lifecycle assurance.
Supply support for CYAT81685-128AS88 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.
CYAT81685-128AS88 belongs to the TrueTouch Gen5 product line, engineered specifically for high-reliability human-machine interfaces demanding robust performance under electrical noise, moisture, and temperature extremes.
FAQ
What is the maximum supported touchscreen size for CYAT81685-128AS88?
The device supports up to 10.1-inch diagonal displays with full 1024 × 1024 resolution scanning, enabled by its 64 Tx/64 Rx channel architecture and on-chip scan engine capable of >100 kHz per-channel sampling. Physical size limit depends on sensor electrode pitch and trace routing, not internal memory or processing bandwidth.
Does CYAT81685-128AS88 require an external crystal oscillator?
No. The device integrates a factory-trimmed 48 MHz internal oscillator sufficient for USB 2.0 Full-Speed timing and CapSense scanning. An optional external 24 MHz crystal may be used for enhanced USB jitter performance but is not required for basic operation or I²C/SPI interfaces.
Can CYAT81685-128AS88 operate with gloves?
Yes. Its CapSense® engine supports thick-glove operation (up to 3 mm synthetic leather) through programmable sensitivity gain and adaptive baseline tracking. Glove mode is activated automatically via signal amplitude analysis and does not require host MCU intervention.
Is there a reference design available for this part?
Infineon provides the CY8CKIT-029 TrueTouch Evaluation Kit, which includes a fully assembled PCB with CYAT81685-128AS88, 7-inch resistive/capacitive overlay, USB bridge, and GUI-based tuning software. Schematics, layout files, and firmware source code are publicly available on the Infineon Developer Community portal.
CYAT81685-128AS88 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)
CYAT81685-128AS88 FAQ
1.How can I place an order for CYAT81685-128AS88 through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81685-128AS88 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 CYAT81685-128AS88 reliable?
The price and inventory of CYAT81685-128AS88 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81685-128AS88 is usually 5 days.
3.What payment methods are accepted for CYAT81685-128AS88?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81685-128AS88 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81685-128AS88?
CYAT81685-128AS88 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81685-128AS88 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 CYAT81685-128AS88?
For technical support, including CYAT81685-128AS88 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81685-128AS88 requirements.
6.How does Aetrix verify that CYAT81685-128AS88 is sourced from the original manufacturer or authorized distributors?
All CYAT81685-128AS88 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 CYAT81685-128AS88 meets industry standards.
7.What is the process for return or replacement of CYAT81685-128AS88?
All CYAT81685-128AS88 units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81685-128AS88, 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 CYAT81685-128AS88 part is unused and in its original packaging.
Return procedure for CYAT81685-128AS88:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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