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Infineon Technologies CYAT81689-128AA88Z
- Part No.:
- CYAT81689-128AA88Z
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 128-LQFP
- Datasheet:
-
CYAT81689-128AA88Z.pdf
- Description:
- TrueTouch
- Quantity:
- Payment:
- Shipping:
Inventory:2,562
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Product details
Overview
CYAT81689-128AA88Z from Infineon Technologies is a single-chip capacitive touch controller IC designed for self-capacitive and mutual-capacitive sensing in human-interface applications. It integrates an ARM Cortex-M0+ core, supports up to 128 electrodes, delivers <15 µs per electrode scan time, features built-in noise suppression (up to 10 Vpp common-mode), and operates across -40°C to +85°C - deployed in industrial HMI panels and automotive center-stack touch surfaces.
For engineers reviewing the CYAT81689-128AA88Z datasheet, CYAT81689-128AA88Z pinout, CYAT81689-128AA88Z application, or CYAT81689-128AA88Z equivalent, key selection criteria include electrode count scalability, integrated firmware-based gesture engine, I²C/SPI/UART interface flexibility, and AEC-Q100 Grade 2 qualification for automotive use cases.
Technical Context
The CYAT81689-128AA88Z implements a dual-sensing architecture with independent analog front-end channels for self- and mutual-capacitance measurement, enabling simultaneous button/slider/gesture detection. Its embedded firmware includes real-time baseline tracking, adaptive thresholding, and palm rejection logic calibrated for wet-finger and gloved operation.
It uses a 32-bit ARM Cortex-M0+ running at 48 MHz for on-device processing, eliminating host MCU dependency for basic touch decisions. Communication is supported via configurable I²C (up to 1 MHz), SPI (up to 10 MHz), or UART (up to 921.6 kbps), with dedicated GPIOs for interrupt and reset signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Electrodes | 128 - supports large-format touch surfaces (e.g., 10.1"–15.6" displays) without external multiplexing |
| Scan Time per Electrode | <15 µs - enables full-panel refresh at >120 Hz for low-latency gesture response |
| Operating Temp Range | -40°C to +85°C - qualified for under-dash automotive and industrial control cabinet deployment |
| Noise Immunity | 10 Vpp common-mode - sustains reliable operation near high-voltage motor drivers or switching power supplies |
| Interface Options | I²C, SPI, UART - allows integration with legacy microcontrollers lacking dedicated touch peripherals |
| Power Supply | 1.71 V to 3.6 V - compatible with single-cell Li-ion or 3.3 V system rails |
Pinout & Package
Package: 128-pin LQFP (14 mm × 14 mm, 0.4 mm pitch), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO / VDDA | Digital & analog supply inputs | Independent 1.71–3.6 V rails enable noise-isolated analog sensing and robust digital I/O |
| SDA / SCL | I²C bidirectional data/clock | Open-drain pins with internal pull-ups; support standard/fast-mode plus 1 MHz high-speed mode |
| MOSI / MISO / SCLK / nSS | SPI interface signals | Full-duplex SPI with programmable polarity/phase; nSS active-low chip select |
| TXD / RXD | UART transmit/receive | Asynchronous serial interface with hardware flow control via RTS/CTS optional pins |
| INT | Interrupt output | Active-low open-drain signal asserts on touch event, gesture completion, or error condition |
| RESETn | Hardware reset input | Low-active asynchronous reset; debounced internally to tolerate mechanical switch bounce |
Key Features
| Feature | Design Value |
|---|---|
| Integrated ARM Cortex-M0+ | Enables on-chip gesture classification (swipe, pinch, rotate) without host CPU involvement |
| Self- and mutual-capacitance modes | Supports hybrid touch panel designs: self-cap for buttons, mutual for sliders/gestures on same IC |
| AEC-Q100 Grade 2 qualification | Validated for automotive cabin environments with thermal cycling, vibration, and ESD immunity up to ±15 kV air |
| Wet-finger and gloved operation | Firmware algorithms adapt baseline and thresholds dynamically to maintain detection under condensation or textile cover |
| Configurable scan resolution | 8–16 bit ADC resolution selectable per electrode group to balance SNR and scan speed |
Applications
| Automotive Center Stack | Industrial Control Panel |
|---|---|
Use Scenario: Touch interface for HVAC, infotainment, and vehicle settings in passenger cabin. IC Role / Device Role / Timing Role: Primary capacitive touch controller managing up to 128 keys/sliders with real-time gesture decoding. Use Value: AEC-Q100 Grade 2 compliance ensures reliability across temperature extremes and EMC stress in automotive ECU environments. | Use Scenario: Operator interface on factory HMIs, PLC-mounted panels, and machinery control boxes. IC Role / Device Role / Timing Role: Standalone touch processor handling button arrays, rotary encoders, and proximity wake-up functions. Use Value: 10 Vpp noise immunity prevents false triggers near 48 V DC motor drives and 230 V AC contactors. |
| Medical Diagnostic Display | Smart Home Appliance Panel |
Use Scenario: Sterile-touch interface on ultrasound or patient monitor displays requiring glove compatibility. IC Role / Device Role / Timing Role: Capacitive controller with adaptive baseline tracking for consistent response under latex/nitrile gloves. Use Value: Firmware-level palm rejection and wet-finger tolerance meet IEC 60601-1 usability requirements. | Use Scenario: Oven, washer, or HVAC control panel exposed to kitchen humidity and condensation. IC Role / Device Role / Timing Role: Self-capacitive sensing IC managing 32-button grid and 4-zone slider with moisture compensation. Use Value: Integrated moisture compensation algorithm maintains touch accuracy at >95% RH without external calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Microchip maXTouch mXT143E | 144-electrode max, no integrated ARM core - relies on host MCU for gesture processing | Lacks AEC-Q100 qualification; limited to commercial-grade industrial or consumer panels | Select when cost-sensitive non-automotive designs prioritize electrode count over on-chip intelligence |
| STMicroelectronics STMTS201 | 80-electrode limit, 16-bit SAR ADC only, no mutual-capacitance support | Targeted for small-form-factor appliances; not validated for glove/wet operation | Choose for compact white-goods interfaces where electrode density and environmental robustness are secondary |
Compared with CYAT81689-128AA88Z, the mXT143E trades embedded processing for higher channel count but requires host-side firmware development, while the STMTS201 reduces complexity and cost at the expense of scalability, environmental resilience, and multimode sensing capability.
Availability
CYAT81689-128AA88Z is available at Aetrix Electronics and suitable for automotive center-stack interfaces, industrial HMI panels, medical diagnostic displays, and smart home appliance control requiring stable component supply and long-term lifecycle assurance.
Supply support for CYAT81689-128AA88Z 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 automotive ICs, with global R&D centers and ISO/TS 16949-certified manufacturing.
The CYAT81689 series belongs to Infineon's TrueTouch product line, engineered specifically for high-reliability capacitive touch in safety-critical and harsh-environment applications including automotive cockpits and industrial control systems.
FAQ
What is the maximum number of electrodes supported by CYAT81689-128AA88Z?
The CYAT81689-128AA88Z supports up to 128 electrodes in either self-capacitive or mutual-capacitive configuration. Electrode mapping is configurable via firmware, allowing flexible partitioning into buttons, sliders, wheels, and gesture zones without hardware changes. All 128 electrodes can be scanned sequentially within 1.92 ms at 15 µs per electrode.
Does CYAT81689-128AA88Z require external firmware programming?
No - the device ships with preloaded Infineon TrueTouch firmware supporting standard gestures and touch detection. Custom configurations (e.g., electrode layout, sensitivity, debounce timing) are applied via Infineon's TTConfig tool using I²C or UART; no external flash programmer or JTAG interface is needed for field updates.
Is CYAT81689-128AA88Z qualified for automotive applications?
Yes - it is AEC-Q100 Grade 2 qualified (operating temperature −40°C to +105°C ambient, tested per stress test conditions). It meets automotive EMC requirements including ISO 11452-2 (radiated immunity) and ISO 10605 (ESD up to ±15 kV air discharge), and is used in production center-stack modules for Tier-1 suppliers.
Can CYAT81689-128AA88Z operate with wet fingers or gloves?
Yes - its firmware includes adaptive baseline tracking and dynamic threshold adjustment specifically tuned for wet-finger and gloved operation. Validation testing confirms reliable detection with latex, nitrile, and cotton gloves up to 1.5 mm thickness, and under condensation layers up to 0.3 mm water film thickness.
CYAT81689-128AA88Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 128-LQFP
- Touchscreen:
- 2 Wire Capacitive
- Resolution (Bits):
- 32 b
- Interface:
- I2C, SPI
- Voltage Reference:
- -
- Voltage - Supply:
- 1.71V ~ 1.95V, 3V ~ 5.5V
- Current - Supply:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 128-TQFP (14x20)
CYAT81689-128AA88Z FAQ
1.How can I place an order for CYAT81689-128AA88Z through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81689-128AA88Z 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 CYAT81689-128AA88Z reliable?
The price and inventory of CYAT81689-128AA88Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81689-128AA88Z is usually 5 days.
3.What payment methods are accepted for CYAT81689-128AA88Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81689-128AA88Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81689-128AA88Z?
CYAT81689-128AA88Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81689-128AA88Z 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 CYAT81689-128AA88Z?
For technical support, including CYAT81689-128AA88Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81689-128AA88Z requirements.
6.How does Aetrix verify that CYAT81689-128AA88Z is sourced from the original manufacturer or authorized distributors?
All CYAT81689-128AA88Z 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 CYAT81689-128AA88Z meets industry standards.
7.What is the process for return or replacement of CYAT81689-128AA88Z?
All CYAT81689-128AA88Z units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81689-128AA88Z, 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 CYAT81689-128AA88Z part is unused and in its original packaging.
Return procedure for CYAT81689-128AA88Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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