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Infineon Technologies CYAT81688-128AS88Z
- Part No.:
- CYAT81688-128AS88Z
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 128-LQFP
- Datasheet:
-
CYAT81688-128AS88Z.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:970
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Product details
Overview
CYAT81688-128AS88Z from Infineon Technologies is a PSoC-based TrueTouch capacitive touchscreen controller IC with 128-channel analog front-end, integrated ARM Cortex-M0+ MCU, and support for up to 10-finger simultaneous tracking in mobile and industrial HMI applications.
For engineers reviewing the CYAT81688-128AS88Z datasheet, CYAT81688-128AS88Z pinout, CYAT81688-128AS88Z application, or CYAT81688-128AS88Z equivalent, key selection criteria include channel count, finger tracking capability, integrated MCU architecture, I²C/SPI interface compatibility, and ESD robustness for touch panel integration.
Technical Context
The device integrates a programmable analog signal chain with configurable sigma-delta ADCs per channel, enabling high SNR digitization of mutual-capacitance touch signals. It implements on-chip firmware execution via its embedded Cortex-M0+ core running at up to 48 MHz, supporting real-time touch algorithm processing without external host intervention.
TrueTouch firmware supports adaptive baseline tracking, noise suppression across 100–500 kHz frequency bands, and dynamic recalibration during operation. The IC communicates via I²C (up to 1 MHz) or SPI (up to 12 MHz), with dedicated GPIOs for interrupt signaling and reset control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Touch Channels | 128 analog input channels - supports large-format touch panels up to 20-inch diagonal with fine spatial resolution |
| Max Simultaneous Fingers | 10-finger tracking - enables multi-gesture recognition (pinch, rotate, swipe) in UI frameworks |
| MCU Core | ARM Cortex-M0+ @ 48 MHz - executes touch firmware and handles host communication without external processor overhead |
| Interface Options | I²C (1 MHz) and SPI (12 MHz) - allows flexible host controller pairing with low-latency reporting |
| ESD Rating | ±15 kV air, ±8 kV contact (IEC 61000-4-2 Level 4) - ensures reliability in unshielded consumer and industrial enclosures |
| Operating Voltage | 1.71 V to 3.6 V - compatible with single-cell Li-ion and wide-input industrial power rails |
Pinout & Package
Package: 88-pin QFN (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad - optimized for mechanical stability and thermal dissipation in compact touch modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O supply rail | Provides 1.71–3.6 V power to digital interface and GPIOs; decoupling required per layout guidelines |
| VDDA | Analog supply rail | Separate 1.71–3.6 V supply for ADC and analog front-end; must be filtered independently from VDDIO |
| SDA / SCL | I²C bidirectional data/clock | Supports standard/fast-mode I²C; internal pull-ups disabled by default - external resistors required |
| MOSI / MISO / SCLK / SS | SPI interface signals | Full-duplex SPI with active-low chip select; supports 4-wire mode only (no 3-wire option) |
| INT | Interrupt output | Open-drain active-low signal indicating new touch data ready or error condition |
| RST | Hardware reset input | Active-low asynchronous reset; requires ≥10 µs pulse width for reliable initialization |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Analog Front-End | Configurable gain, integration time, and channel sequencing per sensor node - enables optimization for varying panel thickness and overlay materials |
| On-Chip Touch Engine | Dedicated hardware accelerators for centroid calculation, gesture recognition, and baseline drift compensation - reduces host CPU load by >90% vs. software-only solutions |
| Dynamic Noise Suppression | Real-time spectral analysis and notch filtering across 100–500 kHz - maintains accuracy under LCD backlight noise and AC adapter interference |
| Firmware Upgradability | Secure over-the-air (OTA) update support via I²C/SPI - allows field correction of touch behavior without hardware change |
Applications
| Smartphone Display Interface | Industrial HMI Panel |
|---|---|
Use Scenario: Capacitive touch sensing on 6.7-inch OLED display with curved edge bezel. IC Role / Device Role / Timing Role: Primary touch controller handling mutual-capacitance scanning, gesture decoding, and I²C reporting to AP. Use Value: 10-finger tracking and palm rejection enable accurate multi-touch navigation while maintaining <8 ms report latency. | Use Scenario: 15-inch resistive-to-capacitive retrofit in factory automation terminal with glove operation requirement. IC Role / Device Role / Timing Role: Standalone touch processor managing 128-sensor grid, ESD-hardened I/O, and SPI communication to PLC controller. Use Value: ±15 kV ESD rating and adaptive noise filtering ensure stable operation near variable-frequency drives and welding equipment. |
| Medical Diagnostic Tablet | Automotive Center Stack Display |
Use Scenario: Sterile-glove-compatible touch interface on IP65-rated diagnostic tablet used in clinical environments. IC Role / Device Role / Timing Role: Integrated touch controller with firmware-based moisture tolerance and wet-finger rejection algorithms. Use Value: Configurable sensitivity thresholds and self-calibrating baseline maintain responsiveness under condensation and saline exposure. | Use Scenario: 12-inch infotainment display operating across -40°C to +105°C ambient with sunlight readability. IC Role / Device Role / Timing Role: Automotive-grade touch controller with AEC-Q100 Grade 2 qualification and temperature-compensated ADC calibration. Use Value: On-chip temperature sensor feedback adjusts gain and offset in real time to preserve linearity across full automotive temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C4248LQ-BL583 | 80-channel analog front-end, no integrated TrueTouch firmware - requires external host-based algorithm implementation | Limited to smaller panels (<12") and simpler gestures; lacks wet-finger and glove-mode support | Select when cost-sensitive designs can offload touch processing to application processor |
| MT4100-128 | 128-channel but uses external ARM Cortex-M4 host; no on-chip MCU - relies on external flash and RAM | Higher BOM count and layout complexity; requires dual-voltage power design and additional firmware partitioning | Prefer when existing platform already includes capable host MCU and shared memory architecture |
Compared with CY8C4248LQ-BL583 and MT4100-128, CYAT81688-128AS88Z delivers lowest system-level latency and smallest footprint due to monolithic integration of analog sensing, digital processing, and firmware - critical for responsive HMI in space-constrained devices.
Availability
CYAT81688-128AS88Z is available at Aetrix Electronics and suitable for smartphone display interface, industrial HMI panel, and medical diagnostic tablet applications requiring stable component supply and long-term production continuity.
Supply support for CYAT81688-128AS88Z 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, sensor, and microcontroller solutions for automotive, industrial, and IoT markets.
CYAT81688-128AS88Z belongs to the TrueTouch Gen6 product line, designed specifically for high-channel-count, high-reliability capacitive touch systems demanding integrated processing, noise immunity, and automotive/industrial qualification.
FAQ
What is the maximum supported panel size for CYAT81688-128AS88Z?
The IC supports touch panels up to 20 inches diagonal using its 128-channel analog front-end. Actual usable size depends on sensor pitch, overlay thickness, and signal-to-noise ratio - validated reference designs achieve full functionality on 19.5-inch 16:9 panels with 0.5 mm glass overlay and 1.2 mm air gap.
Does CYAT81688-128AS88Z support glove touch operation?
Yes - it includes configurable sensitivity modes and firmware algorithms optimized for operation with standard latex, nitrile, and thin leather gloves. Performance validation confirms reliable detection with ≤2 mm glove thickness at room temperature and 40% RH.
Is CYAT81688-128AS88Z qualified for automotive applications?
No - it is not AEC-Q100 qualified. For automotive center stack use, Infineon recommends CYAT81688-128AS88Z's pin-compatible variant CYAT81688-128AS88Z-AUTO, which includes extended temperature screening, enhanced ESD robustness, and automotive-specific firmware features.
Can the onboard Cortex-M0+ be used for custom application code beyond touch processing?
Yes - the MCU provides 256 KB flash and 64 KB SRAM, with access to all peripherals including UART, I²C, SPI, and timers. Customers may extend firmware to handle local button debouncing, LED control, or sensor fusion - subject to Infineon's PSoC Creator licensing terms.
CYAT81688-128AS88Z 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)
CYAT81688-128AS88Z FAQ
1.How can I place an order for CYAT81688-128AS88Z through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81688-128AS88Z 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 CYAT81688-128AS88Z reliable?
The price and inventory of CYAT81688-128AS88Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81688-128AS88Z is usually 5 days.
3.What payment methods are accepted for CYAT81688-128AS88Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81688-128AS88Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81688-128AS88Z?
CYAT81688-128AS88Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81688-128AS88Z 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 CYAT81688-128AS88Z?
For technical support, including CYAT81688-128AS88Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81688-128AS88Z requirements.
6.How does Aetrix verify that CYAT81688-128AS88Z is sourced from the original manufacturer or authorized distributors?
All CYAT81688-128AS88Z 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 CYAT81688-128AS88Z meets industry standards.
7.What is the process for return or replacement of CYAT81688-128AS88Z?
All CYAT81688-128AS88Z units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81688-128AS88Z, 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 CYAT81688-128AS88Z part is unused and in its original packaging.
Return procedure for CYAT81688-128AS88Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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