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Infineon Technologies CYAT81685-100AA61
- Part No.:
- CYAT81685-100AA61
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 100-LQFP
- Datasheet:
-
CYAT81685-100AA61.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:4,787
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Product details
Overview
CYAT81685-100AA61 from Infineon Technologies is a PSoC-based TrueTouch capacitive touchscreen controller IC with 100-pin TQFP package, supporting up to 32 sensing channels, 10-bit resolution, and integrated analog front-end for mutual-capacitance scanning in mobile and industrial HMI applications.
For engineers reviewing the CYAT81685-100AA61 datasheet, CYAT81685-100AA61 pinout, CYAT81685-100AA61 application, or CYAT81685-100AA61 equivalent, key selection criteria include channel count, scan speed (≤10 ms full-frame), I²C/SPI interface support, built-in noise immunity algorithms, and operating voltage range (2.7–5.5 V).
Technical Context
This device implements a programmable mixed-signal array with configurable analog blocks (CTBMs) and digital logic (UDBs), enabling custom sensor signal conditioning and real-time gesture processing without host CPU intervention. It integrates a dedicated SAR ADC, IDACs for panel drive, and hardware-accelerated baseline tracking.
The TrueTouch architecture uses adaptive frequency hopping and spread-spectrum modulation to reject 50/60 Hz power-line noise and RF interference. Firmware supports multi-finger tracking up to 10 touches with palm rejection and hover detection at ≤3 mm lift-off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensing Channels | 32 independent capacitive sense inputs - enables high-resolution touch panels up to 10-inch diagonal with fine-grained coordinate resolution |
| ADC Resolution | 10-bit SAR ADC - provides sufficient dynamic range for detecting sub-femtofarad capacitance changes on noisy PCB environments |
| Interface | I²C (up to 1 MHz) and SPI (up to 12 MHz) - supports low-latency host communication with minimal GPIO usage |
| Operating Voltage | 2.7 V to 5.5 V - allows direct integration with common system rails including USB-powered and battery-backed designs |
| Scan Time | ≤10 ms per full-frame scan (32-channel) - meets real-time responsiveness requirements for gesture navigation and stylus input |
| ESD Rating | ±15 kV HBM - ensures robustness against human-body discharge during assembly and field operation |
Pinout & Package
Package: 100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, thermally enhanced with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O supply rail | Supplies 1.71–5.5 V to all digital I/O pins; must be decoupled locally to suppress switching noise |
| VDDA | Analog supply rail | Provides clean 2.7–5.5 V to internal ADC, CTBMs, and IDACs; requires separate LC filtering from VDDIO |
| SDA/SCL | I²C bidirectional data/clock | Open-drain pins requiring external pull-ups; support standard/fast-mode I²C up to 1 MHz |
| MOSI/MISO/SCLK/SS | SPI interface signals | Support master/slave SPI configuration; SS active-low enables hardware-driven frame synchronization |
| INT | Interrupt output | Active-low open-drain signal indicating new touch data ready or error condition; level-triggered |
| RESET | Hardware reset input | Asynchronous active-low reset; minimum pulse width 100 ns; resets firmware state and analog calibration |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Analog Front-End | Configurable CTBMs allow tuning of gain, offset, and filtering per channel - eliminates need for external op-amps or RC networks |
| Hardware Gesture Engine | Dedicated UDB resources execute swipe, pinch, rotate, and tap recognition in real time - offloads host processor and reduces latency |
| Adaptive Noise Suppression | Real-time frequency hopping + auto-tuned notch filters reject 50/60 Hz, GSM, and Wi-Fi interference - maintains accuracy in electrically noisy enclosures |
| Self-Capacitance Calibration | Automatic baseline update every 250 ms using dual-slope integration - compensates for temperature drift and mechanical stress on overlay |
Applications
| Smartphone Touch Interface | Industrial HMI Panel |
|---|---|
Use Scenario: Capacitive touch overlay on 5.5-inch AMOLED 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: Supports 10-finger tracking with <5 ms report latency and palm rejection - enables reliable multi-user interaction in handheld mode. | Use Scenario: 7-inch resistive-to-capacitive retrofit on factory floor HMIs exposed to EMI from motor drives. IC Role / Device Role / Timing Role: Standalone touch acquisition engine interfacing via SPI to ARM Cortex-M4 PLC controller. Use Value: ±15 kV HBM rating and adaptive noise suppression maintain >99.9% touch accuracy despite 4 kV fast transient bursts on adjacent 24 V control lines. |
| Medical Tablet UI | Automotive Center Stack |
Use Scenario: Glove-compatible 10-inch tablet used in sterile clinical environments with alcohol wipe exposure. IC Role / Device Role / Timing Role: Dual-mode controller supporting self- and mutual-capacitance for gloved and bare-finger operation. Use Value: Configurable sensitivity thresholds and moisture tolerance enable reliable activation through 2 mm nitrile gloves and surface condensation. | Use Scenario: Integrated center console with haptic feedback and proximity wake-up for infotainment system. IC Role / Device Role / Timing Role: Touch coordinator managing main display, climate sliders, and proximity sensor fusion. Use Value: Hardware-accelerated hover detection (≤3 mm) triggers UI pre-rendering before contact - improves perceived system responsiveness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C4014LQI-422 | Lower channel count (16), no integrated TrueTouch firmware, requires external host firmware for gesture processing | Suitable for simple button/slider interfaces only - lacks multi-touch and noise immunity features | Select when cost-sensitive, low-channel-count designs prioritize BOM reduction over advanced gesture support |
| MTCH6302-I/SS | 16-channel max, fixed-function ASIC (no PSoC programmability), supports only I²C interface | Limited to small-form-factor devices (<4.3 inch); no hardware gesture engine or adaptive noise rejection | Choose for space-constrained consumer electronics where firmware flexibility and noise resilience are secondary |
Compared with CY8C4014LQI-422 and MTCH6302-I/SS, CYAT81685-100AA61 delivers higher channel density, on-die gesture acceleration, and field-proven noise immunity - making it optimal for demanding industrial and automotive HMI deployments where reliability under EMI is non-negotiable.
Availability
CYAT81685-100AA61 is available at Aetrix Electronics and suitable for smartphone touch interfaces, industrial HMI panels, medical tablet UIs, and automotive center stack systems requiring stable component supply and long-term lifecycle support.
Supply support for CYAT81685-100AA61 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 belongs to the TrueTouch Gen5 family - designed specifically for high-noise, multi-touch, and glove-compatible human-machine interfaces in harsh operational environments.
FAQ
What is the maximum supported panel size for CYAT81685-100AA61?
The device supports touch panels up to 10 inches diagonal with 32-channel mutual-capacitance configuration. Panel layout must maintain ≤15 pF total trace capacitance per channel and ≤200 mm trace length to preserve SNR above 40 dB. Larger panels require external multiplexing or reduced channel density.
Does CYAT81685-100AA61 support glove touch operation?
Yes - it supports operation with 2 mm nitrile and 1 mm leather gloves via programmable sensitivity scaling and dual-mode (self/mutual) capacitance scanning. Firmware includes adaptive threshold adjustment that maintains detection stability across temperature ranges from –40°C to +85°C.
Can CYAT81685-100AA61 operate without an external microcontroller?
Yes - its PSoC architecture enables standalone operation with embedded firmware for touch reporting, gesture processing, and noise mitigation. Host communication is optional; I²C/SPI is used only for configuration updates or raw data streaming when required by system architecture.
What is the recommended decoupling for VDDA and VDDIO?
VDDA requires a 10 µF tantalum capacitor plus 100 nF ceramic capacitor placed within 2 mm of the pin; VDDIO needs a 4.7 µF ceramic capacitor with 10 nF parallel ceramic. Both rails must use separate ground planes tied at a single point near the thermal pad to prevent analog/digital coupling.
CYAT81685-100AA61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 100-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 ~ 85°C (TA)
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 100-TQFP (14x14)
CYAT81685-100AA61 FAQ
1.How can I place an order for CYAT81685-100AA61 through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81685-100AA61 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 CYAT81685-100AA61 reliable?
The price and inventory of CYAT81685-100AA61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81685-100AA61 is usually 5 days.
3.What payment methods are accepted for CYAT81685-100AA61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81685-100AA61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81685-100AA61?
CYAT81685-100AA61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81685-100AA61 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 CYAT81685-100AA61?
For technical support, including CYAT81685-100AA61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81685-100AA61 requirements.
6.How does Aetrix verify that CYAT81685-100AA61 is sourced from the original manufacturer or authorized distributors?
All CYAT81685-100AA61 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 CYAT81685-100AA61 meets industry standards.
7.What is the process for return or replacement of CYAT81685-100AA61?
All CYAT81685-100AA61 units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81685-100AA61, 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 CYAT81685-100AA61 part is unused and in its original packaging.
Return procedure for CYAT81685-100AA61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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