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Infineon Technologies CYAT81685-100AA71Z
- Part No.:
- CYAT81685-100AA71Z
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 100-LQFP
- Datasheet:
-
CYAT81685-100AA71Z.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:3,726
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Product details
Overview
CYAT81685-100AA71Z 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 designed for automotive-grade touch interfaces in center-stack infotainment displays.
For engineers reviewing the CYAT81685-100AA71Z datasheet, CYAT81685-100AA71Z pinout, CYAT81685-100AA71Z application, or CYAT81685-100AA71Z equivalent, key selection criteria include I²C/SPI interface compatibility, AEC-Q100 Grade 2 qualification, integrated self-test capability, and support for wet-finger and glove operation in harsh environments.
Technical Context
The CYAT81685-100AA71Z integrates a programmable ARM Cortex-M0+ core with dedicated capacitive-sensing hardware (CSH), enabling real-time signal processing of mutual- and self-capacitance measurements. It features on-chip analog front-end calibration, noise suppression algorithms tuned for automotive EMI environments, and configurable scan timing down to 10 µs per electrode.
It supports host communication via I²C (up to 1 MHz) and SPI (up to 12 MHz), includes 256 KB flash and 64 KB SRAM, and implements secure boot with SHA-256 and AES-128 encryption for firmware integrity verification in safety-critical UI systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.71–5.5 V: Enables direct connection to automotive 3.3 V or 5 V rails without external LDOs. |
| Sensing Channels | 32 RX + 32 TX: Supports full 32×32 mutual-capacitance matrix for high-resolution touchscreens up to 10-inch diagonal. |
| Operating Temp | −40°C to +105°C: Qualified per AEC-Q100 Grade 2 for under-dash and center-console mounting. |
| Interface | I²C (1 MHz) / SPI (12 MHz): Allows low-pin-count host integration or high-throughput firmware updates. |
| Memory | 256 KB Flash / 64 KB SRAM: Sufficient for dual-application firmware (touch + system monitoring) with OTA update space. |
| Capacitance Range | 0.1–100 pF: Covers wide electrode size and overlay thickness variation across OEM display stack-ups. |
Pinout & Package
Package: 100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O Supply | Supplies 1.71–5.5 V to all digital I/O pins; decoupling required per automotive EMC guidelines. |
| VDDA | Analog Supply | Separate 2.7–5.5 V rail for sensor front-end; must be filtered independently to minimize noise coupling. |
| SCL/SDA | I²C Interface | Open-drain bidirectional bus lines; require 2.2 kΩ pull-up to VDDIO for 1 MHz operation. |
| MOSI/MISO/SCLK/SS | SPI Interface | Full-duplex 4-wire SPI; SS active-low enables multi-device sharing on same bus. |
| INT | Interrupt Output | Active-low open-drain signal indicating new touch data ready or error condition. |
| RESET | Hardware Reset | Asynchronous active-low input; minimum pulse width 100 ns for reliable initialization. |
Key Features
| Feature | Design Value |
|---|---|
| Wet-Finger Rejection | Configurable algorithm suppresses false touches from water droplets ≥2 mm diameter without sacrificing sensitivity. |
| Glove Mode | Supports operation with 1.5 mm thick leather or synthetic gloves via adjustable baseline tracking and gain scaling. |
| Self-Test Capability | On-chip diagnostics verify sensor path continuity, ADC linearity, and memory integrity at power-up and runtime. |
| AEC-Q100 Grade 2 | Validated for 1000-hour HTOL at 125°C junction temperature and passed ESD ±15 kV air/±8 kV contact per ISO 10605. |
Applications
| Center-Stack Infotainment Display | Digital Instrument Cluster |
|---|---|
Use Scenario: Touch-responsive main vehicle HMI with climate, media, and navigation controls behind 2 mm glass overlay. IC Role / Device Role / Timing Role: Primary capacitive touch controller handling mutual-capacitance scanning, gesture decoding, and host report generation. Use Value: Delivers <50 ms touch latency and supports multi-finger swipe/gesture recognition under varying lighting and ambient temperature. | Use Scenario: Driver-facing digital gauge cluster with critical touch controls for mode switching and warning acknowledgment. IC Role / Device Role / Timing Role: Safety-relevant touch interface processor with fault detection and redundant reporting paths to MCU. Use Value: Meets ASIL-B functional safety requirements via built-in self-test and lockstep-ready firmware architecture. |
| Rear-Seat Entertainment Panel | Head-Up Display (HUD) Touch Overlay |
Use Scenario: 7-inch rear-seat tablet-style panel with child-lock and palm rejection enabled. IC Role / Device Role / Timing Role: Dedicated touch controller managing independent electrode grid and local gesture engine. Use Value: Enables simultaneous two-user interaction with configurable palm rejection thresholds and dynamic baseline adaptation. | Use Scenario: Transparent touch layer laminated onto HUD combiner glass for driver-accessible virtual controls. IC Role / Device Role / Timing Role: Low-power capacitive sensor hub optimized for ultra-thin electrode patterns and high optical transparency. Use Value: Achieves >90% optical transmission while maintaining 0.5 mm touch accuracy through 0.7 mm glass substrate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MTCH6302-I/SS | 8-channel max, no AEC-Q100 qualification, 1.8 V only supply, no glove/wet-finger support. | Targeted at consumer portable devices, not automotive interiors. | Use only for non-automotive, low-channel-count designs where cost is primary constraint. |
| ATMXT224E-MAU | Legacy AVR-based architecture, 224-node max, no ARM core, limited memory (16 KB RAM), no cryptographic acceleration. | Designed for legacy industrial HMIs; lacks automotive thermal and EMC robustness. | Consider only for brownfield upgrades where existing firmware and layout reuse is mandatory. |
Compared with MTCH6302-I/SS and ATMXT224E-MAU, CYAT81685-100AA71Z provides higher channel count, automotive qualification, and integrated security - making it suitable for new automotive HMI platforms requiring functional safety and long-term supply stability.
Availability
CYAT81685-100AA71Z is available at Aetrix Electronics and suitable for center-stack infotainment displays, digital instrument clusters, and rear-seat entertainment panels requiring stable component supply across extended automotive production lifecycles.
Supply support for CYAT81685-100AA71Z 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, automotive microcontrollers, and sensing solutions, with global R&D centers and ISO/TS 16949-certified manufacturing.
This device belongs to Infineon's automotive-qualified PSoC TrueTouch product line, engineered specifically for robust, safety-aware capacitive touch interfaces in vehicles with stringent EMC, thermal, and reliability requirements.
FAQ
What is the maximum supported overlay thickness for CYAT81685-100AA71Z?
The device supports up to 8 mm of glass or plastic overlay thickness when configured for standard sensitivity mode. With enhanced gain settings and optimized scan parameters, it achieves reliable detection through 10 mm glass in glove-mode operation, validated per ISO 10605 ESD and ISO 11452-2 radiated immunity test conditions.
Does CYAT81685-100AA71Z support I²C multi-master arbitration?
Yes - the I²C interface complies with SMBus 2.0 and supports multi-master arbitration with clock stretching and collision detection. The internal state machine ensures bus recovery after arbitration loss, and firmware APIs provide callback hooks for master handover events during concurrent host access.
Can CYAT81685-100AA71Z operate without external crystal?
Yes - it uses an internal precision RC oscillator (±2% over temperature) for system clocking. An external 1–20 MHz crystal is optional and improves timing accuracy for high-speed SPI or synchronized multi-device scanning, but is not required for basic I²C touch reporting.
Is there a reference design available for automotive touch panel layout?
Infineon provides the CY8CTMA-REFKIT-01 reference design, including Gerber files, BOM, and layout guidelines for 100-pin TQFP routing, shielded sensor trace spacing, and ground plane segmentation to meet CISPR 25 Class 5 emissions limits in vehicle cabins.
CYAT81685-100AA71Z 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)
CYAT81685-100AA71Z FAQ
1.How can I place an order for CYAT81685-100AA71Z through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81685-100AA71Z 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 CYAT81685-100AA71Z reliable?
The price and inventory of CYAT81685-100AA71Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81685-100AA71Z is usually 5 days.
3.What payment methods are accepted for CYAT81685-100AA71Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81685-100AA71Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81685-100AA71Z?
CYAT81685-100AA71Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81685-100AA71Z 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 CYAT81685-100AA71Z?
For technical support, including CYAT81685-100AA71Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81685-100AA71Z requirements.
6.How does Aetrix verify that CYAT81685-100AA71Z is sourced from the original manufacturer or authorized distributors?
All CYAT81685-100AA71Z 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 CYAT81685-100AA71Z meets industry standards.
7.What is the process for return or replacement of CYAT81685-100AA71Z?
All CYAT81685-100AA71Z units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81685-100AA71Z, 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 CYAT81685-100AA71Z part is unused and in its original packaging.
Return procedure for CYAT81685-100AA71Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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