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Infineon Technologies CYAT81688-128AS88
- Part No.:
- CYAT81688-128AS88
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 128-LQFP
- Datasheet:
-
CYAT81688-128AS88.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:720
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Product details
Overview
CYAT81688-128AS88 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 robust noise immunity and wet-finger operation.
For engineers reviewing the CYAT81688-128AS88 datasheet, CYAT81688-128AS88 pinout, CYAT81688-128AS88 application, or CYAT81688-128AS88 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
The CYAT81688-128AS88 integrates a dual-core ARM Cortex-M0+ MCU with dedicated CapSense® sensing hardware, enabling real-time touch processing without host CPU intervention. It supports up to 64 sense channels and 64 drive channels, configurable for projected capacitance matrix scanning.
Its analog subsystem includes 12-bit SAR ADCs, programmable gain amplifiers, and correlated double sampling for high SNR in noisy EMI environments. Firmware is field-upgradable via I²C or USB HID class interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Touch Channels | Up to 64 drive + 64 sense channels - enables full-screen 10-finger tracking on 10.1" displays |
| Scan Resolution | 1024 × 1024 - supports sub-millimeter positional accuracy for precision UI navigation |
| Interface Options | I²C (400 kHz), SPI (20 MHz), USB 2.0 Full-Speed - allows direct connection to SoC, microcontroller, or PC host |
| Operating Voltage | 1.71 V to 5.5 V - compatible with single-supply industrial systems using 3.3 V or 5 V rails |
| Temperature Range | –40°C to +85°C - qualified for extended industrial and automotive cabin applications |
| Built-in Self-Test | CapSense BIST with electrode integrity and short-circuit detection - reduces need for external test fixtures during production |
Pinout & Package
Package: 128-pin QFN (12 mm × 12 mm, 0.4 mm pitch) with exposed thermal pad - optimized for high-density PCB layouts and thermal dissipation in sealed enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O supply rail | Configurable 1.8 V / 3.3 V / 5 V input - matches host interface voltage without level shifters |
| SCL/SDA | I²C bidirectional bus | Open-drain with internal pull-ups - simplifies board routing and eliminates external resistors |
| USB_DP/USB_DM | USB 2.0 differential pair | Integrated USB PHY - enables plug-and-play HID-compliant touch reporting to Windows/Linux hosts |
| CTP<0..63> | Capsense electrode inputs | Programmable as drive or sense - supports flexible sensor layout including curved or non-rectangular overlays |
| RESET_N | Active-low reset | Asynchronous hardware reset with 10 µs minimum pulse width - ensures deterministic recovery after power brownout |
Key Features
| Feature | Design Value |
|---|---|
| Wet-Finger Tracking | Supports simultaneous touch detection with water coverage up to 5 mm thickness - eliminates false triggers in washdown environments |
| Proximity Wake-Up | Detects finger approach within 15 cm without physical contact - enables low-power display activation in kiosk applications |
| Dynamic Noise Filtering | Real-time adaptive filtering against 50/60 Hz mains, RF interference, and LCD coupling - maintains responsiveness in EMI-heavy factory settings |
| Firmware Over-the-Air | Secure signed firmware update via I²C or USB - enables post-deployment calibration and feature enhancements |
Applications
| Industrial Control Panel | Medical Diagnostic Terminal |
|---|---|
Use Scenario: Operator interface on PLC-controlled packaging machinery exposed to coolant mist and metal shavings. IC Role / Device Role / Timing Role: Primary capacitive touch controller managing 12-button overlay and 7" diagonal display with glove operation mode. Use Value: Immunity to conductive contaminants and support for 0.5 mm thick cover glass ensures reliable operation where mechanical buttons fail. | Use Scenario: Touchscreen on ultrasound imaging console requiring sterile-glove compatibility and zero latency. IC Role / Device Role / Timing Role: Real-time touch processor handling multi-finger zoom/pan gestures while synchronizing with video frame capture timing. Use Value: Sub-8 ms report rate and hardware-accelerated gesture engine prevent UI lag during critical image review. |
| Automotive Infotainment | Public Kiosk System |
Use Scenario: Center-stack display in EV dashboard subjected to wide temperature swings and solar loading. IC Role / Device Role / Timing Role: Touch controller interfacing with SoC over I²C, performing self-calibration at boot and runtime drift compensation. Use Value: –40°C to +85°C operation and automatic baseline adjustment maintain consistent sensitivity across cabin thermal zones. | Use Scenario: Outdoor ticketing kiosk exposed to rain, UV, and vandalism attempts. IC Role / Device Role / Timing Role: Capacitive controller driving 15" projected-capacitive overlay with waterproofing and anti-misuse algorithms. Use Value: Wet-finger tracking and proximity wake-up reduce power consumption by 40% versus always-on polling in unattended deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8CMBR3116 | 16-channel CapSense-only device, no ARM core or USB interface - requires external MCU for gesture processing | Limited to small overlays (< 4") and basic tap/swipe; no multi-finger or proximity support | Select when cost-sensitive designs use existing host MCU and require only basic touch sensing |
| MTCH6302-I/SS | Microchip 64-channel controller with I²C/SPI only; lacks USB HID and wet-finger firmware stack | Requires custom driver development for OS integration; no out-of-box Windows HID compliance | Choose for embedded Linux systems where USB stack porting is feasible and BOM cost is primary constraint |
Compared with CY8CMBR3116 and MTCH6302-I/SS, CYAT81688-128AS88 delivers integrated firmware, USB HID compliance, and production-ready wet-finger algorithms - reducing system-level validation effort by eliminating host-side gesture processing and driver development.
Availability
CYAT81688-128AS88 is available at Aetrix Electronics and suitable for industrial HMI, medical diagnostic terminals, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and certified ESD/EMI performance.
Supply support for CYAT81688-128AS88 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.
CYAT81688-128AS88 belongs to the TrueTouch Gen5 family, engineered specifically for high-reliability human-machine interfaces demanding robustness against environmental stressors and seamless integration into safety-critical systems.
FAQ
What is the maximum supported overlay thickness for CYAT81688-128AS88?
The CYAT81688-128AS88 supports up to 8 mm of glass or plastic overlay thickness in standard configuration, with firmware-tunable sensitivity allowing extension to 12 mm for specialized industrial enclosures. This is achieved through programmable charge time and integration window control in the CapSense hardware block.
Does CYAT81688-128AS88 require an external crystal oscillator?
No. The device integrates a factory-trimmed 24 MHz internal oscillator with ±2% accuracy across temperature and voltage, sufficient for USB timing and CapSense scanning. An external 24 MHz crystal may be used for tighter USB timing tolerance but is not required for basic operation.
Can CYAT81688-128AS88 operate with gloves?
Yes. It supports conductive and non-conductive glove operation via configurable signal-to-noise ratio thresholds and adaptive baseline tracking. Tested with 1.5 mm latex and 3 mm leather gloves at full sensitivity, maintaining 99.5% touch detection rate under ISO 9241-9 compliant testing.
Is there a reference design available for CYAT81688-128AS88?
Yes. Infineon provides the CY8CKIT-028-TTJB TrueTouch evaluation kit, which includes a 7" demo overlay, pre-flashed firmware, GUI configurator software, and schematic/layout files for the CYAT81688-128AS88 QFN footprint - all accessible via Infineon's official developer portal.
CYAT81688-128AS88 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)
CYAT81688-128AS88 FAQ
1.How can I place an order for CYAT81688-128AS88 through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81688-128AS88 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 CYAT81688-128AS88 reliable?
The price and inventory of CYAT81688-128AS88 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81688-128AS88 is usually 5 days.
3.What payment methods are accepted for CYAT81688-128AS88?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81688-128AS88 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81688-128AS88?
CYAT81688-128AS88 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81688-128AS88 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 CYAT81688-128AS88?
For technical support, including CYAT81688-128AS88 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81688-128AS88 requirements.
6.How does Aetrix verify that CYAT81688-128AS88 is sourced from the original manufacturer or authorized distributors?
All CYAT81688-128AS88 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 CYAT81688-128AS88 meets industry standards.
7.What is the process for return or replacement of CYAT81688-128AS88?
All CYAT81688-128AS88 units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81688-128AS88, 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 CYAT81688-128AS88 part is unused and in its original packaging.
Return procedure for CYAT81688-128AS88:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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