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Infineon Technologies CYAT81688-100AS71KHT
- Part No.:
- CYAT81688-100AS71KHT
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 100-LQFP
- Datasheet:
-
CYAT81688-100AS71KHT.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:4,476
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Product details
Overview
CYAT81688-100AS71KHT from Infineon Technologies is a PSoC-based TrueTouch capacitive touchscreen controller IC with 100-channel analog front-end, integrated ARM Cortex-M0+ processor, and support for up to 10-finger simultaneous tracking in mobile and industrial HMI applications.
For engineers reviewing the CYAT81688-100AS71KHT datasheet, CYAT81688-100AS71KHT pinout, CYAT81688-100AS71KHT application, or CYAT81688-100AS71KHT equivalent, key selection criteria include mutual-capacitance scan resolution, integrated firmware security features, I²C/SPI interface timing compliance, and operating temperature range for embedded touch panel integration.
Technical Context
This device implements a fully integrated capacitive sensing solution with on-die sigma-delta ADCs per channel, programmable gain amplifiers, and digital signal processing blocks optimized for noise immunity in noisy EMI environments. It supports both self- and mutual-capacitance measurement modes with configurable scan rates up to 120 Hz.
The embedded ARM Cortex-M0+ core runs proprietary TrueTouch firmware that handles gesture recognition, palm rejection, and linearization correction without host CPU intervention. Firmware updates are supported via I²C or SPI using encrypted bootloader protocol.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Channels | 100 analog input channels - enables high-resolution touch panels up to 15-inch diagonal with fine-grained electrode density |
| Processor Core | ARM Cortex-M0+ @ 48 MHz - provides real-time sensor fusion and gesture engine execution without external MCU dependency |
| Interface | I²C (up to 1 MHz) and SPI (up to 12 MHz) - ensures compatibility with low-latency host communication in portable and automotive infotainment systems |
| Operating Temp | –40°C to +85°C - qualified for industrial and extended-temperature consumer HMI deployments |
| Firmware Security | Hardware AES-128 encryption + secure boot - prevents unauthorized firmware modification and cloning of touch subsystems |
| Scan Rate | Up to 120 Hz full-panel refresh - supports smooth scrolling and multi-touch responsiveness in UI-critical applications |
Pinout & Package
Package: 100-pin QFN (12 mm × 12 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O supply rail | 1.71–1.89 V supply for digital interface and GPIOs; decoupling required per Infineon layout guidelines |
| VDDA | Analog supply rail | 3.0–3.6 V supply for sensor AFE and ADCs; separate filtering mandatory to preserve SNR |
| SCL/SDA | I²C bidirectional bus | Open-drain pins supporting standard/fast-mode I²C; internal pull-ups disabled by default |
| MOSI/MISO/SCLK/SS | SPI interface signals | Configurable as master or slave; SS polarity selectable via register for flexible host integration |
| INT | Interrupt output | Active-low open-drain signal indicating data ready or error condition; level-triggered operation |
Key Features
| Feature | Design Value |
|---|---|
| TrueTouch Algorithm Suite | Real-time palm rejection, hover detection, and pressure estimation derived from raw capacitance delta analysis |
| Programmable Sensor Configuration | Per-electrode drive strength, integration time, and baseline update rate configurable via register map |
| EMI Immunity Architecture | Dual-sampling correlation engine and spread-spectrum modulation reduce susceptibility to GSM/RFI interference |
| Low-Power Wake-on-Touch | Sub-100 µA sleep current with configurable wake threshold; maintains touch awareness without host polling |
Applications
| Smartphone Display Interface | Industrial Control Panel |
|---|---|
Use Scenario: Integrated into flagship smartphone display module with curved glass and narrow bezel. IC Role / Device Role / Timing Role: Primary capacitive touch controller handling all gesture processing and reporting via I²C to AP. Use Value: Enables 10-finger tracking and sub-5ms report latency while maintaining >70 dB noise rejection in RF-dense cellular bands. | Use Scenario: Mounted behind 4mm thick chemically strengthened glass in factory HMIs exposed to ESD and conducted noise. IC Role / Device Role / Timing Role: Standalone touch coordinator interfacing with PLC via SPI, managing calibration and drift compensation autonomously. Use Value: Sustains reliable operation at 85°C ambient with no false touches during 4 kV contact ESD events per IEC 61000-4-2. |
| Automotive Center Stack | Medical Diagnostic Tablet |
Use Scenario: Embedded in infotainment center stack with glove-friendly operation and wet-finger tolerance. IC Role / Device Role / Timing Role: Touch controller with dedicated wet-finger algorithm block and CAN-linked status reporting. Use Value: Delivers consistent touch registration under condensation and saline contamination, meeting ISO 11452-4 radiated immunity requirements. | Use Scenario: Used in sterile-field diagnostic tablet requiring glove operation and antimicrobial coating compatibility. IC Role / Device Role / Timing Role: High-reliability touch interface with configurable electrode sensitivity and HIPAA-compliant secure firmware update path. Use Value: Supports 99% detection rate with 3-mm latex gloves and maintains cryptographic integrity during over-the-air firmware patches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8CTMA100-100AXI | Same PSoC TrueTouch architecture but lacks hardware AES engine and operates only up to +70°C | Not qualified for automotive or extended-temp industrial use; reduced security for medical data interfaces | Select when cost-sensitive consumer designs do not require cryptographic firmware protection or wide temperature range |
| MT41001A-100QFN | Competing 100-channel controller with fixed-function ASIC (no programmable M0+ core); lower power but no field-upgradable algorithms | Requires host-side gesture processing; unsuitable for standalone HMI with evolving UI requirements | Select when deterministic ultra-low-power operation is prioritized over firmware flexibility and future-proofing |
Compared with CY8CTMA100-100AXI and MT41001A-100QFN, CYAT81688-100AS71KHT uniquely combines field-upgradable gesture intelligence, hardware-enforced firmware security, and extended-temperature operation-making it optimal for safety-critical and long-lifecycle touch interfaces.
Availability
CYAT81688-100AS71KHT is available at Aetrix Electronics and suitable for smartphone display interface, industrial control panel, and automotive center stack applications requiring stable component supply across multi-year production cycles.
Supply support for CYAT81688-100AS71KHT 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, sensor, and microcontroller solutions for automotive, industrial, and IoT markets.
This part belongs to the PSoC TrueTouch product line, engineered specifically for high-reliability, noise-immune capacitive touch interfaces in harsh electromagnetic and thermal environments.
FAQ
What is the maximum supported electrode count for CYAT81688-100AS71KHT?
The device supports up to 100 analog input channels, enabling configurations such as 20×20 mutual-capacitance grids or mixed self/mutual layouts. Electrode count is constrained by physical pin count and routing density-not firmware limits-and full 100-channel operation requires proper PCB layout adherence to Infineon's AN92239 layout guidelines.
Does CYAT81688-100AS71KHT support I²C multi-master arbitration?
Yes, the I²C interface complies with SMBus 2.0 and supports multi-master arbitration with clock stretching. The controller implements standard START/STOP detection and address matching logic, allowing coexistence with other I²C peripherals on shared buses without bus contention under specified timing conditions.
Can the onboard ARM Cortex-M0+ be used for custom application code?
No-the embedded Cortex-M0+ executes only Infineon-signed TrueTouch firmware. Access to the core for user code is blocked by hardware security fuses. Custom behavior must be implemented via configuration registers, gesture parameter tuning, or host-side post-processing of reported touch data.
Is CYAT81688-100AS71KHT compliant with IEC 61000-4-6 conducted immunity?
Yes-Infineon's qualification testing confirms compliance with IEC 61000-4-6 Level 3 (10 Vrms, 150 kHz–80 MHz) when implemented with recommended common-mode chokes, shielded flex cables, and proper ground partitioning per Application Note AN95142.
CYAT81688-100AS71KHT 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)
CYAT81688-100AS71KHT FAQ
1.How can I place an order for CYAT81688-100AS71KHT through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81688-100AS71KHT 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 CYAT81688-100AS71KHT reliable?
The price and inventory of CYAT81688-100AS71KHT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81688-100AS71KHT is usually 5 days.
3.What payment methods are accepted for CYAT81688-100AS71KHT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81688-100AS71KHT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81688-100AS71KHT?
CYAT81688-100AS71KHT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81688-100AS71KHT 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 CYAT81688-100AS71KHT?
For technical support, including CYAT81688-100AS71KHT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81688-100AS71KHT requirements.
6.How does Aetrix verify that CYAT81688-100AS71KHT is sourced from the original manufacturer or authorized distributors?
All CYAT81688-100AS71KHT 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 CYAT81688-100AS71KHT meets industry standards.
7.What is the process for return or replacement of CYAT81688-100AS71KHT?
All CYAT81688-100AS71KHT units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81688-100AS71KHT, 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 CYAT81688-100AS71KHT part is unused and in its original packaging.
Return procedure for CYAT81688-100AS71KHT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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