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Infineon Technologies CYAT81688-100AS71KH
- Part No.:
- CYAT81688-100AS71KH
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 100-LQFP
- Datasheet:
-
CYAT81688-100AS71KH.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:3,885
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Product details
Overview
CYAT81688-100AS71KH 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, and featuring integrated analog front-end, programmable digital signal processing, and I²C/SPI/UART host interface - deployed in industrial HMI panels requiring robust noise immunity and glove operation.
For engineers reviewing the CYAT81688-100AS71KH datasheet, CYAT81688-100AS71KH pinout, CYAT81688-100AS71KH application, or CYAT81688-100AS71KH equivalent, key selection criteria include mutual-capacitance channel count, integrated firmware configurability, ESD tolerance (±15 kV air), operating voltage range, and host interface flexibility for embedded touch system integration.
Technical Context
This device implements a mixed-signal configurable system-on-chip architecture combining CapSense® sensing hardware with ARM Cortex-M0+ MCU core, enabling real-time touch algorithm execution and sensor self-calibration without external processor intervention. It supports both self- and mutual-capacitance measurement modes with programmable scan resolution (8–16-bit) and adaptive baseline tracking.
The TrueTouch engine includes dedicated hardware accelerators for centroid calculation, gesture recognition (swipe, zoom), and proximity detection, all configurable via Infineon's PSoC Creator IDE. Firmware updates are supported over I²C or UART using secure boot loader functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.71–5.5 V - enables direct connection to common logic rails (1.8 V, 3.3 V, 5 V) without level-shifting circuitry |
| Sensing Channels | 32 mutual-capacitance + 32 self-capacitance - supports high-resolution touch panels up to 10-inch diagonal with multi-finger tracking |
| ESD Rating | ±15 kV air, ±8 kV contact - meets IEC 61000-4-2 Level 4 for front-panel touch interfaces in harsh environments |
| Host Interface | I²C (up to 1 MHz), SPI (up to 12 MHz), UART (up to 921.6 kbps) - allows flexible host processor pairing and low-latency command/response |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade deployment in uncontrolled ambient conditions |
| Firmware Storage | 128 KB flash + 16 KB SRAM - sufficient for full CapSense tuning, gesture library, and customer application code co-residence |
Pinout & Package
100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad (EPAD) connected to VSS for improved power dissipation during continuous scanning.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O Supply | Provides regulated 1.71–5.5 V to all digital I/Os and communication peripherals |
| VDDA | Analog Supply | Dedicated 2.7–5.5 V rail for CapSense analog front-end, isolated from digital noise |
| SDA/SCL | I²C Interface | Open-drain bidirectional signals compatible with standard I²C bus timing and pull-up requirements |
| CS_N | SPI Chip Select | Active-low enable controlling SPI peripheral access; supports multi-device bus sharing |
| TX/RX | UART Interface | Full-duplex asynchronous serial interface with programmable baud rate and parity options |
| EPAD | Thermal Pad | Internally connected to VSS; must be soldered to PCB ground plane for thermal and EMI performance |
Key Features
| Feature | Design Value |
|---|---|
| Glove & Wet-Finger Support | Configurable sensitivity thresholds and noise rejection algorithms maintain reliable detection under 2 mm glove thickness or water-covered surface |
| Proximity Wake-Up | Low-power mode with <10 µA current draw detects finger approach within 5 cm, triggering full wake-up only on confirmed touch |
| CapSense Tuner Integration | Real-time parameter adjustment via USB bridge tool eliminates need for recompilation or reflashing during system tuning |
| Hardware Gesture Engine | Dedicated logic block performs swipe, pinch-to-zoom, and rotate calculations in parallel with main CPU, reducing host processing load |
| Secure Boot Loader | Authenticated firmware update path prevents unauthorized code injection; supports AES-128 encrypted image loading over UART/I²C |
Applications
| Industrial HMI Panels | Medical Device Touchscreens |
|---|---|
Use Scenario: Operator interface on PLC-controlled machinery with oil, dust, and glove use. IC Role / Device Role / Timing Role: Primary capacitive touch controller managing button matrix and slider inputs with real-time response & ESD-hardened signal chain. Use Value: Maintains >99.5% touch accuracy at −40°C to +85°C while rejecting 50/60 Hz line noise and motor drive interference. | Use Scenario: Sterile-field diagnostic equipment requiring wet-finger and glove operation. IC Role / Device Role / Timing Role: Self-contained touch acquisition and preprocessing unit interfacing directly to ARM-based medical SoC via I²C. Use Value: Enables FDA-compliant Class II device certification through built-in self-test (BIST), fault logging, and deterministic scan timing. |
| Automotive Infotainment | Smart Home Control Panels |
Use Scenario: Center console display in passenger vehicles with sunlight exposure and temperature cycling. IC Role / Device Role / Timing Role: Mutual-capacitance controller with automatic baseline compensation and wide-voltage operation (3.3 V–5 V). Use Value: Delivers consistent touch latency (<12 ms) across AEC-Q100 Grade 2 temperature range without recalibration. | Use Scenario: Wall-mounted lighting and climate control panel in residential settings. IC Role / Device Role / Timing Role: Standalone touch interface processor handling multi-button, slider, and proximity wake functions. Use Value: Reduces BOM cost by eliminating external microcontroller; integrates all touch logic, LED feedback control, and UART diagnostics. |
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 mutual), no integrated gesture engine, 64-pin QFN package | Suitable for small-form-factor panels (<4") with basic button/slider needs only | Select when cost sensitivity outweighs advanced gesture or large-panel support |
| MTCH6302-I/ST | No embedded MCU; requires external host for algorithm execution; 28-pin SOIC package | Targeted at designs where host processor handles all touch logic and firmware is managed externally | Select when existing host has spare CPU cycles and firmware maintenance is centralized |
Compared with CYAT81688-100AS71KH, CY8C4014LQI-422 reduces feature set and scalability but lowers unit cost and footprint, while MTCH6302-I/ST shifts processing burden to host and simplifies IC-level validation at the expense of real-time responsiveness and self-contained operation.
Availability
CYAT81688-100AS71KH is available at Aetrix Electronics and suitable for industrial HMIs, medical touch interfaces, automotive infotainment systems, and smart home control panels requiring stable component supply and long-term design-in support.
Supply support for CYAT81688-100AS71KH 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 MCUs, security ICs, and human-machine interface solutions, with global R&D and manufacturing infrastructure.
This part belongs to the TrueTouch Gen5 family, designed specifically for high-reliability, noise-immune capacitive touch applications in industrial, medical, and automotive environments where environmental resilience and functional safety are critical.
FAQ
What host interfaces does CYAT81688-100AS71KH support?
CYAT81688-100AS71KH supports I²C (up to 1 MHz), SPI (up to 12 MHz), and UART (up to 921.6 kbps) host interfaces. All three can be enabled simultaneously, with configurable pin mapping and interrupt signaling. I²C is typically used for configuration and status polling, while SPI handles high-speed data transfer during active scanning.
Does CYAT81688-100AS71KH require external memory for firmware storage?
No. The device integrates 128 KB of on-chip flash memory and 16 KB of SRAM, sufficient to store the complete CapSense firmware, gesture library, and customer application code. No external EEPROM or flash is required for normal operation or field updates.
Can CYAT81688-100AS71KH operate with wet fingers or gloves?
Yes. Its TrueTouch architecture includes adaptive thresholding, dynamic baseline tracking, and noise filtering optimized for wet-finger operation (up to 1 mm water film) and glove use (up to 2 mm thickness). These modes are configurable via CapSense Tuner without firmware changes.
What is the thermal pad (EPAD) connection requirement?
The EPAD must be soldered to a solid copper ground plane on the PCB. It is internally connected to VSS and serves dual purposes: thermal dissipation during sustained scanning and EMI shielding for the analog sensing circuitry. Omitting EPAD connection degrades noise immunity and may cause thermal throttling above 60°C ambient.
CYAT81688-100AS71KH 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)
CYAT81688-100AS71KH FAQ
1.How can I place an order for CYAT81688-100AS71KH through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81688-100AS71KH 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 CYAT81688-100AS71KH reliable?
The price and inventory of CYAT81688-100AS71KH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81688-100AS71KH is usually 5 days.
3.What payment methods are accepted for CYAT81688-100AS71KH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81688-100AS71KH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81688-100AS71KH?
CYAT81688-100AS71KH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81688-100AS71KH 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 CYAT81688-100AS71KH?
For technical support, including CYAT81688-100AS71KH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81688-100AS71KH requirements.
6.How does Aetrix verify that CYAT81688-100AS71KH is sourced from the original manufacturer or authorized distributors?
All CYAT81688-100AS71KH 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 CYAT81688-100AS71KH meets industry standards.
7.What is the process for return or replacement of CYAT81688-100AS71KH?
All CYAT81688-100AS71KH units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81688-100AS71KH, 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 CYAT81688-100AS71KH part is unused and in its original packaging.
Return procedure for CYAT81688-100AS71KH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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