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Infineon Technologies CYAT81685-100AA61Z
- Part No.:
- CYAT81685-100AA61Z
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 100-LQFP
- Datasheet:
-
CYAT81685-100AA61Z.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:1,947
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Product details
Overview
CYAT81685-100AA61Z 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/sliders, operating at 1.71–5.5 V supply, and featuring integrated analog front-end and programmable firmware for automotive-grade touch interfaces in center-stack displays.
For engineers reviewing the CYAT81685-100AA61Z datasheet, CYAT81685-100AA61Z pinout, CYAT81685-100AA61Z application, or CYAT81685-100AA61Z equivalent, key selection criteria include mutual-capacitance channel count, AEC-Q100 qualification status, I²C/SPI interface support, built-in noise immunity algorithms, and firmware-upgradable architecture for evolving HMI requirements.
Technical Context
This device implements a mixed-signal configurable system-on-chip (PSoC) architecture integrating ARM Cortex-M0+ MCU core, dedicated capacitive sensing hardware (CapSense CSD), and programmable digital blocks. It supports both self- and mutual-capacitance sensing modes with real-time baseline tracking and adaptive thresholding.
The TrueTouch engine includes hardware-accelerated gesture processing (swipe, zoom, tap), active shield drive for noise suppression, and configurable scan resolution up to 16-bit. It operates across -40°C to +105°C and meets ISO 11452-2/ISO 11452-4 for automotive EMC compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Sensing Channels | 32 mutual-capacitance electrodes - enables full center-stack display with multi-finger gesture support |
| Supply Voltage Range | 1.71 V to 5.5 V - supports direct connection to automotive 3.3 V or 5 V rails without LDO |
| Operating Temperature | -40°C to +105°C - qualified for under-dash automotive cabin environments |
| Interface Protocols | I²C (up to 1 MHz) and SPI (up to 12 MHz) - allows flexible host processor integration |
| AEC-Q100 Grade | Grade 2 - certified for automotive applications requiring reliability at 105°C ambient |
| Firmware Upgradability | Field-upgradable via I²C/SPI - enables post-deployment HMI feature updates without hardware change |
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 Input | Supplies voltage for GPIOs and interface logic; independent of core VDDD |
| VDDD | Digital Core Supply | Powers ARM Cortex-M0+ and digital peripherals; decoupling required per layout guidelines |
| VREF | Analog Reference Input | Provides stable reference for CapSense ADC; can be internal or external 1.2 V source |
| SCL / SDA | I²C Bus Interface | Open-drain bidirectional lines; require external pull-ups for standard I²C timing compliance |
| MOSI / MISO / SCLK / SS | SPI Interface Terminals | Support full-duplex SPI communication; SS active-low chip select for multi-device bus sharing |
Key Features
| Feature | Design Value |
|---|---|
| Programmable CapSense Engine | Configurable scan parameters (resolution, averaging, sample rate) per electrode - enables optimization for button vs. slider vs. proximity use cases |
| Active Shield Drive | Drives shield traces at same phase as sensor signals - reduces crosstalk and improves SNR in high-density layouts |
| Hardware Gesture Engine | Dedicated logic block processes swipe, pinch, rotate gestures in real time - offloads CPU and ensures deterministic response latency |
| Automotive EMC Robustness | Built-in spread-spectrum clocking and dynamic noise filtering - maintains operation during RF injection per ISO 11452-2 up to 200 V/m |
Applications
| Center-Stack Infotainment Display | Instrument Cluster Touch Overlay |
|---|---|
Use Scenario: Capacitive touch overlay on 7–10 inch TFT display in vehicle center console with glove-mode and wet-finger operation. IC Role / Device Role / Timing Role: Primary touch controller managing mutual-capacitance scanning, gesture decoding, and host communication via I²C. Use Value: Supports 10-finger tracking and low-latency (<15 ms) gesture reporting while maintaining AEC-Q100 Grade 2 reliability. | Use Scenario: Secondary touch interface on digital instrument cluster for driver-accessible controls (e.g., trip reset, display mode). IC Role / Device Role / Timing Role: Dedicated touch acquisition unit with isolated power domain and fast wake-from-sleep response. Use Value: Achieves <50 µA sleep current and sub-100 ms wake-to-touch-report latency for battery-sensitive clusters. |
| Head-Up Display (HUD) Touch Panel | Passenger Seat Control Panel |
Use Scenario: Small-area projected-capacitive overlay on HUD combiner glass for driver-interactive settings without head movement. IC Role / Device Role / Timing Role: Low-noise analog front-end with adaptive baseline compensation for optical interference rejection. Use Value: Maintains touch accuracy under strong ambient light and thermal drift (±0.5% capacitance drift over -40°C to +105°C). | Use Scenario: Multi-button capacitive control panel embedded in passenger-side door trim with haptic feedback coordination. IC Role / Device Role / Timing Role: Local touch manager interfacing with main ECU via SPI, synchronizing with haptic actuator timing. Use Value: Enables precise timing alignment between touch detection and haptic pulse (±200 µs jitter) for perceptual consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8CMBR3116 | 16-channel mutual-capacitance, no ARM core, fixed-function ASIC | Limited to basic button/slider; no gesture engine or firmware upgrade path | Select for cost-sensitive non-gesture UIs where full PSoC flexibility is unnecessary |
| MTCH6302-I/SS | 32-channel, I²C-only, no AEC-Q100 qualification, max 85°C operation | Targeted for consumer electronics; lacks automotive EMC hardening and extended temperature support | Select only for non-automotive applications with lower environmental stress and no functional safety requirement |
Compared with CY8CMBR3116 and MTCH6302-I/SS, CYAT81685-100AA61Z uniquely combines AEC-Q100 Grade 2 qualification, ARM-based firmware extensibility, and hardware-accelerated gesture processing - making it the sole option for upgradable, safety-aware automotive touch systems requiring field updates and multi-finger interaction.
Availability
CYAT81685-100AA61Z is available at Aetrix Electronics and suitable for automotive infotainment systems, digital instrument clusters, and head-up display interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for CYAT81685-100AA61Z 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 and manufacturing infrastructure.
CYAT81685 belongs to the automotive-qualified TrueTouch PSoC product line, designed specifically for robust, programmable capacitive touch interfaces in harsh-temperature, high-EMI vehicle environments.
FAQ
What is the maximum number of simultaneous touch points supported by CYAT81685-100AA61Z?
The device supports up to 10 simultaneous touch points with full coordinate reporting and gesture recognition. This capability is enabled by its 32-channel mutual-capacitance architecture and dedicated hardware gesture engine, which processes multi-finger swipes, pinches, and rotations without CPU intervention.
Does CYAT81685-100AA61Z include built-in diagnostic features for automotive functional safety?
It includes self-test capabilities such as electrode open/short detection, reference voltage monitoring, and CapSense block integrity checks. While not ASIL-certified standalone, it supports system-level ASIL-B compliance when integrated with appropriate host MCU diagnostics and fault-handling software per ISO 26262.
Can the firmware be updated in-system after vehicle deployment?
Yes - the device supports field firmware updates via I²C or SPI using Cypress-provided bootloader and secure update framework. Updates preserve calibration data and retain user-defined configuration parameters, enabling HMI feature enhancements without physical rework.
Is external memory required for operation?
No external memory is required. The device integrates 256 KB flash for firmware and configuration storage, 32 KB SRAM for runtime variables, and dedicated CapSense tuning data storage in non-volatile registers - all sufficient for full touch stack execution including gesture processing and noise filtering.
CYAT81685-100AA61Z 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)
CYAT81685-100AA61Z FAQ
1.How can I place an order for CYAT81685-100AA61Z through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81685-100AA61Z 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 CYAT81685-100AA61Z reliable?
The price and inventory of CYAT81685-100AA61Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81685-100AA61Z is usually 5 days.
3.What payment methods are accepted for CYAT81685-100AA61Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81685-100AA61Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81685-100AA61Z?
CYAT81685-100AA61Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81685-100AA61Z 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 CYAT81685-100AA61Z?
For technical support, including CYAT81685-100AA61Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81685-100AA61Z requirements.
6.How does Aetrix verify that CYAT81685-100AA61Z is sourced from the original manufacturer or authorized distributors?
All CYAT81685-100AA61Z 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 CYAT81685-100AA61Z meets industry standards.
7.What is the process for return or replacement of CYAT81685-100AA61Z?
All CYAT81685-100AA61Z units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81685-100AA61Z, 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 CYAT81685-100AA61Z part is unused and in its original packaging.
Return procedure for CYAT81685-100AA61Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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