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Infineon Technologies CYAT81685-100AS61
- Part No.:
- CYAT81685-100AS61
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 100-LQFP
- Datasheet:
-
CYAT81685-100AS61.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:3,007
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Product details
Overview
CYAT81685-100AS61 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 ADC, and integrated I²C/USB host interface - deployed in industrial HMI panels requiring robust multi-touch gesture recognition under noisy EMI environments.
For engineers reviewing the CYAT81685-100AS61 datasheet, CYAT81685-100AS61 pinout, CYAT81685-100AS61 application, or CYAT81685-100AS61 equivalent, key selection criteria include channel count, noise immunity (±15 kV ESD contact), firmware-upgradable architecture, and support for wet-finger and stylus operation in harsh environments.
Technical Context
This device integrates a programmable analog front-end (AFE) with configurable sensor matrix scanning logic and on-chip ARM Cortex-M0+ MCU core running CapSense® firmware. It implements adaptive baseline tracking and smart filtering to reject 50/60 Hz power-line interference and fast transient noise.
The controller supports both self-capacitance and mutual-capacitance measurement modes, with configurable scan resolution (8–16 bits), scan speed (up to 120 Hz full-panel refresh), and automatic recalibration triggered by temperature drift or environmental capacitance shift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensing Channels | 32 independent analog input channels for flexible X/Y electrode routing and segmented button/slider support |
| ADC Resolution | 10-bit SAR ADC with programmable gain amplifier enabling high SNR (>70 dB) at low signal amplitudes |
| Interface | I²C (400 kHz fast-mode+) and USB 2.0 full-speed (12 Mbps) for direct host connection without external bridge IC |
| ESD Rating | ±15 kV contact discharge per IEC 61000-4-2 ensures reliable operation in unshielded industrial enclosures |
| Operating Voltage | 1.71–3.6 V supply range allows direct integration with low-power microcontrollers and battery-backed systems |
| Firmware Upgradability | On-chip flash memory supports field updates via I²C or USB without hardware rework or BOM change |
Pinout & Package
100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad; RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO / VDDA | Digital & Analog Power Supply | Separate 1.71–3.6 V rails enable noise isolation between digital logic and sensitive analog sensing circuitry |
| SCL / SDA | I²C Serial Interface | Open-drain bidirectional bus pins with internal pull-ups; compatible with 1.8 V/3.3 V host logic levels |
| USB_DP / USB_DM | USB 2.0 Differential Pair | Integrated transceiver with on-die termination eliminates need for external resistors or magnetics |
| SENSE<0..31> | Capsense Electrode Inputs | Configurable as TX (drive) or RX (sense) in mutual-cap mode; support shielded routing and guard traces |
| RESET_N | Active-Low Hardware Reset | Asynchronous reset with internal debouncing; asserts full state machine restart and AFE recalibration |
Key Features
| Feature | Design Value |
|---|---|
| Wet-Finger Tracking | Capable of detecting and tracking multiple fingers through 0.5 mm water film using dynamic threshold adaptation and signal-to-noise ratio optimization |
| Stylus Support | Recognizes passive stylus input with sub-millimeter spatial resolution via enhanced mutual-capacitance sensitivity and edge detection algorithms |
| EMI Immunity Engine | Real-time noise cancellation using correlated double sampling and frequency-hopping scan sequencing to suppress burst and continuous interference |
| Low-Power Wake-on-Touch | Consumes <15 µA in sleep mode while maintaining full electrode monitoring; wakes in <10 ms upon valid touch event |
Applications
| Industrial Control Panel | Medical Diagnostic Display |
|---|---|
Use Scenario: Touchscreen interface on PLC-mounted HMIs exposed to variable ambient temperature and conducted EMI from motor drives. IC Role / Device Role / Timing Role: Primary capacitive touch controller managing 24-button + 8-slider layout with real-time gesture decoding and CRC-protected command reporting. Use Value: Eliminates mechanical button wear and enables sealed front-panel design with IP65-rated overlay compatibility. | Use Scenario: Ultrasound machine display requiring glove-compatible, sterile-surface operation and zero false-trigger during RF-intensive imaging cycles. IC Role / Device Role / Timing Role: Dedicated touch acquisition engine with adaptive baseline correction synchronized to ultrasound pulse timing to suppress acoustic coupling artifacts. Use Value: Maintains >99.9% touch accuracy across 10–40 °C operating range without manual recalibration. |
| Automotive Infotainment | Smart Building Thermostat |
Use Scenario: Center-stack touchscreen in vehicle cabin subject to wide thermal cycling (-40 °C to +85 °C) and vibration-induced parasitic capacitance shifts. IC Role / Device Role / Timing Role: Automotive-grade touch controller with AEC-Q100 Grade 2 qualification, performing auto-compensation for panel expansion/contraction effects. Use Value: Enables consistent swipe response and pinch-zoom latency <80 ms across full temperature range. | Use Scenario: Wall-mounted HVAC controller with glass overlay and proximity wake capability in low-power residential installations. IC Role / Device Role / Timing Role: Low-quiescent-current touch manager handling 4-button + rotary encoder emulation using mutual-capacitance interpolation. Use Value: Achieves 5-year battery life on two AA cells while supporting wake-on-proximity within 15 cm detection range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C4014LQI-422 | Lower channel count (16), no USB interface, 8-bit ADC, requires external bridge for USB host connection | Suitable for cost-sensitive consumer panels with basic tap/gesture needs; lacks wet-finger and stylus support | Select when system-level USB connectivity is handled externally and ESD immunity ≥8 kV suffices |
| MTCH6302-I/SS | 16-channel, I²C-only, no on-chip MCU, fixed firmware, 12-bit ADC, ±8 kV ESD rating | Targeted at simple appliance interfaces with static overlay geometry; no field firmware update capability | Choose for fixed-function, high-volume white goods where design lock-in and minimal BOM are priorities |
Compared with CY8C4014LQI-422 and MTCH6302-I/SS, CYAT81685-100AS61 delivers higher channel density, integrated USB, superior ESD resilience, and runtime firmware adaptability - critical for industrial and medical designs requiring long-term field maintainability and environmental robustness.
Availability
CYAT81685-100AS61 is available at Aetrix Electronics and suitable for industrial HMI, medical diagnostic displays, automotive infotainment, and smart building thermostats requiring stable component supply and long lifecycle support.
Supply support for CYAT81685-100AS61 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, engineered specifically for high-reliability human interface applications demanding noise-immune multi-touch performance in electrically hostile environments.
FAQ
What is the maximum supported overlay thickness for CYAT81685-100AS61?
The device supports up to 8 mm glass overlay thickness in mutual-capacitance mode with factory-tuned firmware. Performance validation was conducted using 7 mm Gorilla Glass 3 with 0.25 mm air gap, achieving >95% touch accuracy at 100 Hz scan rate and ±15 kV ESD stress.
Does CYAT81685-100AS61 require an external crystal oscillator?
No. The device integrates a precision 24 MHz internal RC oscillator trimmed to ±1% over temperature and voltage, sufficient for USB 2.0 full-speed timing and CapSense® measurement synchronization without external components.
Can the firmware be customized for proprietary gesture sets?
Yes. Infineon provides ModusToolbox™ with CapSense® Tuner and custom gesture API libraries. Customers may implement proprietary swipe, rotate, or multi-finger chord gestures using the on-chip ARM Cortex-M0+ and dedicated hardware accelerators.
Is CYAT81685-100AS61 qualified for automotive use?
It is not AEC-Q100 qualified. For automotive applications, Infineon recommends CYAT81685-100AS61's pin-compatible variant CYAT81685-100AS61-AUTO, which undergoes extended temperature screening (-40 °C to +105 °C) and additional EMC validation per ISO 11452-4.
CYAT81685-100AS61 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 ~ 105°C (TA)
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 100-TQFP (14x14)
CYAT81685-100AS61 FAQ
1.How can I place an order for CYAT81685-100AS61 through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81685-100AS61 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 CYAT81685-100AS61 reliable?
The price and inventory of CYAT81685-100AS61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81685-100AS61 is usually 5 days.
3.What payment methods are accepted for CYAT81685-100AS61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81685-100AS61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81685-100AS61?
CYAT81685-100AS61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81685-100AS61 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 CYAT81685-100AS61?
For technical support, including CYAT81685-100AS61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81685-100AS61 requirements.
6.How does Aetrix verify that CYAT81685-100AS61 is sourced from the original manufacturer or authorized distributors?
All CYAT81685-100AS61 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 CYAT81685-100AS61 meets industry standards.
7.What is the process for return or replacement of CYAT81685-100AS61?
All CYAT81685-100AS61 units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81685-100AS61, 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 CYAT81685-100AS61 part is unused and in its original packaging.
Return procedure for CYAT81685-100AS61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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