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Infineon Technologies CYAT81685-100AA77Z
- Part No.:
- CYAT81685-100AA77Z
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 100-LQFP
- Datasheet:
-
CYAT81685-100AA77Z.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:4,238
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Product details
Overview
CYAT81685-100AA77Z from Infineon Technologies is a PSoC-based TrueTouch capacitive touchscreen controller IC with 100-pin TQFP package, supporting up to 32 sensing channels and 32 mutual-capacitance buttons, operating at 1.71–5.5 V supply voltage, and featuring integrated analog front-end and ARM Cortex-M0+ core for real-time touch processing in industrial HMI panels.
For engineers reviewing the CYAT81685-100AA77Z datasheet, CYAT81685-100AA77Z pinout, CYAT81685-100AA77Z application, or CYAT81685-100AA77Z equivalent, key selection criteria include mutual-capacitance channel count, integrated MCU architecture, ESD tolerance (±15 kV air), operating voltage range, and I²C/SPI interface compatibility with host processors.
Technical Context
This device integrates a programmable analog signal chain with configurable capacitive sensing blocks and an ARM Cortex-M0+ processor running at up to 48 MHz. It supports both self-capacitance and mutual-capacitance measurement modes with hardware-accelerated baseline tracking and noise filtering algorithms.
The TrueTouch architecture includes dedicated hardware for finger tracking, gesture recognition (swipe, zoom, rotate), and multi-touch decoding with up to 10 simultaneous touches. Communication interfaces include I²C (up to 1 MHz), SPI (up to 12 MHz), and interrupt output for host synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Processor | ARM Cortex-M0+ @ 48 MHz - enables on-device gesture processing without host CPU overhead |
| Sensing Channels | 32 Rx + 32 Tx - supports up to 1024-node mutual-capacitance matrix for large-format touch panels |
| Supply Voltage | 1.71–5.5 V - allows direct connection to 3.3 V or 5 V system rails without LDO |
| ESD Rating | ±15 kV HBM - meets IEC 61000-4-2 Level 4 for front-panel robustness in industrial environments |
| Interface | I²C (1 MHz) / SPI (12 MHz) - provides flexible host integration with low-latency command/response timing |
| Operating Temp | −40°C to +85°C - qualified for extended temperature operation in factory automation and outdoor kiosks |
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 | Supplies 1.71–5.5 V to digital I/Os and interface logic; decoupling required per pin group |
| VDDA | Analog Supply | Provides clean 3.3 V ±5% for analog front-end; separate from VDDIO to reduce noise coupling |
| SCL/SDA | I²C Interface | Open-drain bidirectional signals; require external pull-ups to VDDIO |
| MOSI/MISO/SCLK/SS | SPI Interface | Full-duplex 4-wire SPI; SS active-low enables slave select for multi-device bus sharing |
| INT | Interrupt Output | Active-low open-drain signal indicating touch event or firmware status change |
| RESET | Hardware Reset | Active-low asynchronous reset; must be held low ≥10 µs for full initialization |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Sensing Architecture | Configurable Rx/Tx scan matrix and resolution via firmware - enables reuse across panel sizes without hardware change |
| On-Chip Gesture Engine | Dedicated hardware block for swipe, pinch, rotate detection - reduces host CPU load and latency by >80% vs software-only implementation |
| Auto-Tuning Calibration | Real-time baseline and sensitivity adjustment during operation - maintains accuracy across temperature/humidity drift and panel aging |
| Water & Glove Tolerance | Supports operation with 5 mm water layer and 3 mm thick gloves - validated per IEC 61000-4-2 and ISO 10605 |
Applications
| Industrial HMI Panels | Medical Diagnostic Displays |
|---|---|
Use Scenario: Touch-enabled control interface on factory floor HMIs exposed to oil, dust, and ESD events. IC Role / Device Role / Timing Role: Primary capacitive touch controller handling all sensor scanning, noise rejection, and gesture decoding. Use Value: ±15 kV HBM ESD rating and −40°C to +85°C operation ensure reliability in uncontrolled industrial environments. | Use Scenario: Sterilizable touchscreen on ultrasound or MRI console requiring glove operation and liquid immunity. IC Role / Device Role / Timing Role: Dual-mode (self/mutual) controller enabling accurate touch under latex/nitrile gloves and surface moisture. Use Value: Hardware-accelerated water/glove compensation maintains 99.5% touch accuracy with 5 mm water layer and 3 mm gloves. |
| Retail Self-Service Kiosks | Automotive Infotainment |
Use Scenario: Public-facing kiosk in shopping malls subject to vandalism, high ambient light, and variable user input. IC Role / Device Role / Timing Role: High-channel-count mutual-capacitance controller managing 32×32 node overlay for responsive 10-finger tracking. Use Value: 32 Rx/32 Tx channel support enables large active area (>15") with sub-5 ms report rate and <10 ms latency. | Use Scenario: Center-stack infotainment display in passenger vehicles requiring ASIL-B compatible touch response. IC Role / Device Role / Timing Role: Safety-aware touch processor with built-in diagnostics and fault reporting via I²C status register. Use Value: Integrated CRC checking, memory test routines, and watchdog timer meet ISO 26262 functional safety requirements for ASIL-B systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8CTMA120-100AXI | Legacy TrueTouch Gen 3 device; no ARM Cortex-M0+, fixed-function ASIC architecture | Limited to 16 Rx/16 Tx; no on-chip gesture engine or auto-tuning calibration | Select only for cost-sensitive legacy designs where firmware flexibility and advanced noise immunity are not required |
| MTCH6302-I/SS | Microchip 28-pin QFN; 16-channel max, no integrated MCU, requires external host for gesture processing | Targeted for small-form-factor consumer devices; lacks industrial temp grade and ESD robustness | Choose when board space is constrained and host processor has sufficient resources for real-time gesture computation |
Compared with CY8CTMA120-100AXI and MTCH6302-I/SS, CYAT81685-100AA77Z delivers higher channel density, on-device intelligence for reduced host load, and industrial-grade environmental resilience-making it optimal for next-generation HMI and medical touch systems.
Availability
CYAT81685-100AA77Z is available at Aetrix Electronics and suitable for industrial HMI panels, medical diagnostic displays, retail self-service kiosks, and automotive infotainment systems requiring stable component supply and long-term lifecycle support.
Supply support for CYAT81685-100AA77Z 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 Gen 5 family, designed specifically for high-reliability, multi-touch capacitive sensing in harsh environments with demanding ESD, temperature, and contamination requirements.
FAQ
What is the maximum number of simultaneous touches supported by CYAT81685-100AA77Z?
The CYAT81685-100AA77Z supports up to 10 simultaneous touches using its hardware-accelerated multi-touch engine. This capability is enabled by the 32×32 mutual-capacitance sensing matrix and on-chip tracking algorithm, which processes raw capacitance data in real time without host intervention. Touch resolution remains consistent across the full active area, with typical latency below 10 ms at 120 Hz scan rate.
Does CYAT81685-100AA77Z require external firmware programming before use?
Yes - CYAT81685-100AA77Z ships with factory-programmed bootloader but requires custom configuration firmware loaded via SWD or I²C. Infineon provides PSoC Creator and ModusToolbox IDE with pre-validated touch tuning libraries, including panel-specific calibration scripts and gesture profiles. No external flash memory is needed, as firmware executes from on-chip 256 KB flash.
Can CYAT81685-100AA77Z operate with wet or gloved fingers?
Yes - the device supports reliable operation with up to 5 mm continuous water layer and 3 mm thick industrial gloves, validated per IEC 61000-4-2 and ISO 10605. This is achieved through adaptive thresholding, dynamic baseline compensation, and proprietary water rejection algorithms executed in hardware, eliminating need for host-level post-processing.
What is the thermal pad connection requirement for the 100-pin TQFP package?
The exposed thermal pad on the CYAT81685-100AA77Z TQFP package must be soldered to a solid copper thermal plane on the PCB using ≥6 thermal vias (0.3 mm diameter, filled or capped) connected to internal ground layers. The pad is electrically tied to VSSA and must not be left floating or connected to other nets. Thermal resistance from junction to board is specified at 32°C/W under recommended layout conditions.
CYAT81685-100AA77Z 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)
CYAT81685-100AA77Z FAQ
1.How can I place an order for CYAT81685-100AA77Z through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81685-100AA77Z 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 CYAT81685-100AA77Z reliable?
The price and inventory of CYAT81685-100AA77Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81685-100AA77Z is usually 5 days.
3.What payment methods are accepted for CYAT81685-100AA77Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81685-100AA77Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81685-100AA77Z?
CYAT81685-100AA77Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81685-100AA77Z 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 CYAT81685-100AA77Z?
For technical support, including CYAT81685-100AA77Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81685-100AA77Z requirements.
6.How does Aetrix verify that CYAT81685-100AA77Z is sourced from the original manufacturer or authorized distributors?
All CYAT81685-100AA77Z 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 CYAT81685-100AA77Z meets industry standards.
7.What is the process for return or replacement of CYAT81685-100AA77Z?
All CYAT81685-100AA77Z units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81685-100AA77Z, 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 CYAT81685-100AA77Z part is unused and in its original packaging.
Return procedure for CYAT81685-100AA77Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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