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Infineon Technologies CYAT81688-100AS71Z
- Part No.:
- CYAT81688-100AS71Z
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 100-LQFP
- Datasheet:
-
CYAT81688-100AS71Z.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:900
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Product details
Overview
CYAT81688-100AS71Z 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-touch capability.
For engineers reviewing the CYAT81688-100AS71Z datasheet, CYAT81688-100AS71Z pinout, CYAT81688-100AS71Z application, or CYAT81688-100AS71Z equivalent, key selection criteria include mutual-capacitance channel count, integrated firmware configurability, ESD tolerance (±15 kV air, ±8 kV contact), operating temperature range (–40°C to +85°C), and host interface flexibility for embedded Linux or RTOS integration.
Technical Context
This device implements a mixed-signal programmable system-on-chip architecture combining ARM Cortex-M0+ CPU core with configurable analog and digital blocks optimized for capacitive touch sensing. It integrates dedicated sigma-delta ADCs per sensor channel, on-chip flash (64 KB) and SRAM (8 KB), and supports dynamic reconfiguration of scan parameters during runtime.
The TrueTouch engine provides real-time baseline tracking, palm rejection, hover detection, and multi-finger gesture decoding (up to 10 fingers) without host CPU intervention. All calibration and compensation algorithms execute autonomously in firmware stored in internal nonvolatile memory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.71 V to 5.5 V - supports direct connection to diverse system rails including 3.3 V and 5 V logic domains without level-shifting. |
| Sensing Channels | 32 mutual-capacitance + 32 self-capacitance - enables high-resolution touch panels up to 10-inch diagonal with button/slider/gesture zones. |
| Operating Temp | –40°C to +85°C - qualified for industrial control panels and outdoor kiosks without thermal derating. |
| ESD Rating | ±15 kV HBM, ±8 kV IEC 61000-4-2 contact - eliminates need for external TVS diodes in most front-panel designs. |
| Host Interface | I²C (up to 1 MHz), SPI (up to 12 MHz), UART (up to 921.6 kbps) - allows seamless integration with microcontrollers, SoCs, or FPGAs across multiple protocol stacks. |
| Firmware Memory | 64 KB flash, 8 KB SRAM - sufficient for field-upgradable touch algorithm updates and custom gesture definitions. |
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 | Configurable 1.71–5.5 V rail powering all digital I/Os and host interface pins - decoupling required per JEDEC guidelines. |
| VDDA | Analog Supply | Dedicated 2.7–5.5 V analog domain supply for sigma-delta ADCs and reference buffers - must be filtered separately from digital rails. |
| SDA/SCL | I²C Interface | Open-drain bidirectional signals compatible with 1.8 V, 3.3 V, and 5 V host systems - internal pull-ups disabled by default. |
| CS_N / SCLK / MOSI / MISO | SPI Interface | Standard 4-wire SPI with active-low chip select - supports daisy-chain configuration for multi-controller systems. |
| TXD / RXD | UART Interface | Full-duplex asynchronous serial interface - no flow control lines; timing accuracy maintained via internal RC oscillator calibrated against crystal reference. |
| CTP[0:31] | Capsense Terminals | 32 dedicated analog input/output pins for mutual-capacitance electrode routing - each supports programmable drive strength and sampling resolution. |
Key Features
| Feature | Design Value |
|---|---|
| Glove & Wet-Finger Support | Configurable sensitivity thresholds and adaptive baseline tracking enable reliable operation with 3 mm gloves and water-covered surfaces. |
| Noise Immunity Engine | Real-time frequency hopping, spread-spectrum modulation, and correlated double sampling suppress 50/60 Hz EMI and RF interference up to 2 GHz. |
| On-Chip Firmware Updates | Secure bootloader allows field updates of touch algorithm, gesture maps, and calibration tables without external programming hardware. |
| Low-Power Wake-on-Touch | Deep-sleep current < 15 µA with sub-100 ms wake latency - suitable for battery-powered portable HMIs with >1-year standby life. |
| Configurable Reporting Rate | Adjustable from 20 Hz to 240 Hz via register write - balances responsiveness and power consumption for target UI latency requirements. |
Applications
| Industrial Control Panel | Medical Diagnostic Display |
|---|---|
Use Scenario: Touch-enabled operator interface on PLC-mounted HMI with IP65-rated front bezel and chemical-resistant overlay. IC Role / Device Role / Timing Role: Primary capacitive touch controller managing 24-button layout, slider, and 2D gesture zone with real-time noise rejection in factory-floor EMI environment. Use Value: Eliminates mechanical switches and reduces panel assembly cost while maintaining >99.9% touch accuracy under 10 V/m conducted noise. | Use Scenario: Sterilizable touchscreen on ultrasound machine display requiring glove operation and rapid boot-time response. IC Role / Device Role / Timing Role: Dedicated touch processor handling multi-finger zoom/pan gestures and simultaneous button presses during imaging workflows. Use Value: Achieves <15 ms end-to-end touch-to-display latency and supports FDA-required 24-hour continuous operation validation. |
| Smart Building Thermostat | Public Kiosk Terminal |
Use Scenario: Wall-mounted HVAC controller with ambient light-adaptive backlight and condensation-resistant glass overlay. IC Role / Device Role / Timing Role: Low-power touch manager enabling wake-on-tap from 2 µA sleep mode, with automatic baseline recalibration during temperature drift. Use Value: Extends battery life to 5 years on two AA cells while maintaining consistent touch performance across –10°C to +50°C ambient range. | Use Scenario: Outdoor ticketing kiosk exposed to rain, UV, and vandalism with tempered glass front panel. IC Role / Device Role / Timing Role: Robust touch coordinator supporting wet-finger operation, palm rejection, and anti-glare surface compensation. Use Value: Delivers >99.5% first-touch recognition rate under simulated rainfall (IEC 60529 IPX5 test conditions). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C4046LQ-443 | Lower channel count (16 mutual), no integrated TrueTouch firmware - requires external host-driven algorithm execution. | Limited to small-form-factor interfaces (<4.3 inch); lacks glove/wet-finger support out-of-box. | Select when BOM cost is primary constraint and touch complexity is low; requires additional firmware development effort. |
| MTCH6302-I/SS | Fixed-function ASIC (no programmable CPU), 28-channel max, only I²C interface, no SPI/UART. | Targeted at consumer appliances; lacks industrial temp range and ESD robustness (±8 kV HBM only). | Choose for high-volume white-goods applications where feature set is static and qualification cycles are short. |
Compared with CY8C4046LQ-443 and MTCH6302-I/SS, CYAT81688-100AS71Z delivers full programmability, higher channel density, industrial-grade reliability, and autonomous gesture processing - making it optimal for mission-critical HMIs where field adaptability and long-term maintainability are essential.
Availability
CYAT81688-100AS71Z is available at Aetrix Electronics and suitable for industrial control panels, medical diagnostic displays, smart building thermostats, and public kiosk terminals requiring stable component supply across extended product lifecycles.
Supply support for CYAT81688-100AS71Z 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.
CYAT81688-100AS71Z belongs to the TrueTouch Gen5 family, designed specifically for high-noise industrial and medical touch applications demanding programmable flexibility, robust EMC performance, and long-term firmware maintainability.
FAQ
What host processors are compatible with CYAT81688-100AS71Z?
CYAT81688-100AS71Z supports standard I²C, SPI, and UART protocols with voltage-tolerant I/Os, enabling direct interfacing with ARM Cortex-A/M series SoCs, Renesas RA/RX MCUs, NXP i.MX and LPC families, and Xilinx Zynq FPGA soft processors. No special drivers are required beyond generic peripheral libraries.
Does CYAT81688-100AS71Z require an external crystal?
Yes - a 24 MHz ±100 ppm fundamental-mode crystal is required for USB-compatible timing and precise sigma-delta ADC sampling. The device does not operate reliably with internal RC oscillators for production touch performance; crystal load capacitance must be 12 pF per datasheet section 7.2.1.
Can the touch firmware be customized for proprietary gestures?
Yes - Infineon provides ModusToolbox™ TrueTouch Configurator and PSoC Creator IDE with full source access to gesture engine modules. Customers may modify swipe thresholds, add new multi-finger patterns, or integrate custom proximity-based wake logic using the provided API framework.
What PCB layout guidelines apply to CTP[0:31] traces?
Each CTP trace must be impedance-controlled at 50 Ω, length-matched within ±5 mm, routed over solid ground plane, and separated from noisy signals (clocks, switching regulators) by ≥3× trace width. Guard rings tied to VSS must surround all CTP pads, and series 0 Ω resistors are recommended for debug access.
CYAT81688-100AS71Z 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)
CYAT81688-100AS71Z FAQ
1.How can I place an order for CYAT81688-100AS71Z through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81688-100AS71Z 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 CYAT81688-100AS71Z reliable?
The price and inventory of CYAT81688-100AS71Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81688-100AS71Z is usually 5 days.
3.What payment methods are accepted for CYAT81688-100AS71Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81688-100AS71Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81688-100AS71Z?
CYAT81688-100AS71Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81688-100AS71Z 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 CYAT81688-100AS71Z?
For technical support, including CYAT81688-100AS71Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81688-100AS71Z requirements.
6.How does Aetrix verify that CYAT81688-100AS71Z is sourced from the original manufacturer or authorized distributors?
All CYAT81688-100AS71Z 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 CYAT81688-100AS71Z meets industry standards.
7.What is the process for return or replacement of CYAT81688-100AS71Z?
All CYAT81688-100AS71Z units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81688-100AS71Z, 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 CYAT81688-100AS71Z part is unused and in its original packaging.
Return procedure for CYAT81688-100AS71Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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