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Infineon Technologies CYAT81688-100AS71T
- Part No.:
- CYAT81688-100AS71T
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 100-LQFP
- Datasheet:
-
CYAT81688-100AS71T.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:3,734
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Product details
Overview
CYAT81688-100AS71T from Infineon Technologies is a PSoC-based TrueTouch capacitive touchscreen controller IC with 100-pin TQFP package, supporting up to 48 sensing channels, 10-bit SAR ADC resolution, and integrated I²C/USB host interface - deployed in industrial HMI panels requiring robust multi-touch gesture recognition under noisy EMI environments.
For engineers reviewing the CYAT81688-100AS71T datasheet, CYAT81688-100AS71T pinout, CYAT81688-100AS71T application, or CYAT81688-100AS71T equivalent, key selection criteria include channel count, noise immunity (±15 kV ESD HBM), firmware-upgradable architecture, and support for wet-finger and gloved-finger operation.
Technical Context
This device integrates a programmable analog front-end (AFE) with configurable sensor matrix scanning logic and on-chip ARM Cortex-M0+ MCU core running proprietary touch firmware. It implements adaptive baseline tracking and mutual-capacitance measurement with 120 Hz report rate at full channel count.
The TrueTouch architecture includes dedicated hardware accelerators for palm rejection, hover detection, and linear interpolation of touch coordinates - all operating without host CPU intervention. Firmware updates are delivered via I²C or USB without requiring external flash memory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensing Channels | 48-channel mutual-capacitance matrix support enables 10-inch diagonal touch panels with 5-mm trace pitch. |
| ADC Resolution | 10-bit SAR ADC provides 1024-level signal quantization for high dynamic range touch signal capture. |
| ESD Rating | ±15 kV HBM ensures reliable operation in unshielded industrial enclosures without additional TVS protection. |
| Report Rate | 120 Hz at full channel count maintains low-latency response for fast swipe and pinch gestures. |
| Interface | I²C (up to 1 MHz) and USB 2.0 full-speed (12 Mbps) allow direct connection to SoC or microcontroller hosts. |
| Operating Voltage | 1.71–1.89 V core supply enables integration with low-voltage power domains in battery-powered HMIs. |
Pinout & Package
100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad (EPAD) connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O Power Supply | Supplies 1.71–3.6 V to GPIOs and interface logic; decoupling required per Infineon layout guidelines. |
| SCL / SDA | I²C Bus Interface | Open-drain bidirectional signals compatible with 1.8 V or 3.3 V host systems; internal pull-ups disabled by default. |
| USB_DP / USB_DM | USB 2.0 Differential Pair | Full-speed USB transceiver with integrated termination; requires 27-Ω series resistors per USB spec. |
| SENSE<0..47> | Capsense Channel Input | Configurable as TX or RX in mutual-capacitance mode; supports shielded routing for noise immunity. |
| INT | Interrupt Output | Active-low open-drain signal asserts when new touch data is ready; level-triggered for host polling avoidance. |
Key Features
| Feature | Design Value |
|---|---|
| Wet-Finger Tracking | Operates reliably with water coverage up to 5 mm thickness using adaptive thresholding and signal filtering. |
| Gloved-Finger Support | Detects 1.5-mm-thick synthetic gloves without sensitivity loss via optimized drive strength and integration time tuning. |
| Firmware Upgradability | Field updates delivered over I²C/USB using signed binary images; no external flash or bootloader hardware required. |
| Palm Rejection Logic | Hardware-accelerated algorithm distinguishes palm contact from intentional finger input using spatial-temporal signature analysis. |
Applications
| Industrial Control Panel | Medical Device Touchscreen |
|---|---|
Use Scenario: Operator interface on PLC-mounted HMI with IP65-rated enclosure and ambient temperature range −25°C to +70°C. IC Role / Device Role / Timing Role: Primary capacitive touch controller managing 32-button + slider overlay with real-time gesture decoding. Use Value: ±15 kV ESD rating eliminates need for external protection diodes; firmware-upgrade capability enables post-deployment UI enhancements. | Use Scenario: Sterilizable patient monitor touchscreen subjected to alcohol wipe cycles and glove use in ICU environments. IC Role / Device Role / Timing Role: Dual-mode controller supporting both bare-finger and 2-mm-thick nitrile glove operation with zero recalibration. Use Value: Wet-finger tracking maintains accuracy during accidental spill exposure; low-power sleep mode extends battery life in portable units. |
| Automotive Center Stack | Smart Appliance Interface |
Use Scenario: Infotainment center stack in cabin with wide temperature swing (−40°C to +85°C) and high EMI from motor drives. IC Role / Device Role / Timing Role: Touch coordinator interfacing via I²C to automotive-grade SoC; handles multi-finger zoom and rotate gestures. Use Value: Adaptive baseline tracking compensates for capacitance drift due to temperature/humidity; 120 Hz report rate prevents gesture lag. | Use Scenario: Oven/microwave control panel with tempered glass overlay and frequent cleaning with abrasive agents. IC Role / Device Role / Timing Role: Robust touch acquisition engine driving 24-key matrix with proximity wake-up and haptic feedback sync. Use Value: Shielded sensing channel routing reduces noise coupling from high-voltage AC components; EPAD improves thermal dissipation during extended use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8CTMA1688-100AXI | Same PSoC TrueTouch platform but with 168-pin BGA package and extended 64-channel support. | Targeted at larger displays (>12") requiring higher channel density and tighter layout constraints. | Select when board space allows BGA and >48 channels are needed; not pin-compatible. |
| ATMXT224E-MAU | Microchip maXTouch controller with 224-node scan capability, 3.3 V I/O, and different firmware architecture. | Lacks native USB interface and wet-finger optimization; requires external level-shifting for 1.8 V hosts. | Choose for cost-sensitive consumer designs where USB and advanced moisture handling are non-critical. |
Compared with CY8CTMA1688-100AXI and ATMXT224E-MAU, CYAT81688-100AS71T delivers optimal balance of channel count, 1.8 V compatibility, USB integration, and certified wet/gloved operation - making it preferred for mid-size industrial and medical HMIs where TQFP assembly and field-upgradability are mandatory.
Availability
CYAT81688-100AS71T is available at Aetrix Electronics and suitable for industrial HMI, medical device interfaces, automotive infotainment centers, and smart appliance control panels requiring stable component supply across extended product lifecycles.
Supply support for CYAT81688-100AS71T 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, sensing, and microcontroller solutions for industrial, automotive, and IoT applications.
CYAT81688-100AS71T belongs to the TrueTouch family - designed specifically for high-reliability capacitive touch applications demanding ESD resilience, environmental robustness, and field-upgradable firmware in harsh operating conditions.
FAQ
What is the maximum supported overlay thickness for CYAT81688-100AS71T?
The device supports up to 8 mm of glass or plastic overlay thickness in mutual-capacitance mode, verified per Infineon's TRUETOUCH characterization reports using standard 500-Ω/cm sheet resistance ITO layers. Performance remains stable up to 5 mm with water coverage and 2 mm with nitrile gloves.
Does CYAT81688-100AS71T require external crystal or oscillator?
No. The device integrates a factory-trimmed 24 MHz internal oscillator sufficient for USB full-speed timing and touch scanning. An external 24 MHz crystal may be used for tighter frequency tolerance (<±100 ppm), but is optional and not required for basic operation or USB compliance.
Can CYAT81688-100AS71T operate in single-ended (self-capacitance) mode?
No. This part is configured exclusively for mutual-capacitance sensing. Its analog front-end, firmware, and pin mapping are optimized for TX/RX matrix scanning; self-capacitance mode is not implemented or supported in any revision of this variant.
What debug interface does CYAT81688-100AS71T provide for firmware development?
It supports SWD (Serial Wire Debug) via dedicated SWDIO and SWCLK pins (pins 12 and 13 on TQFP package), enabling full JTAG/SWD access to the ARM Cortex-M0+ core for firmware bring-up, real-time variable inspection, and flash programming using standard Infineon-provided tools like ModusToolbox and PSoC Programmer.
CYAT81688-100AS71T 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)
CYAT81688-100AS71T FAQ
1.How can I place an order for CYAT81688-100AS71T through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81688-100AS71T 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 CYAT81688-100AS71T reliable?
The price and inventory of CYAT81688-100AS71T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81688-100AS71T is usually 5 days.
3.What payment methods are accepted for CYAT81688-100AS71T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81688-100AS71T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81688-100AS71T?
CYAT81688-100AS71T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81688-100AS71T 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 CYAT81688-100AS71T?
For technical support, including CYAT81688-100AS71T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81688-100AS71T requirements.
6.How does Aetrix verify that CYAT81688-100AS71T is sourced from the original manufacturer or authorized distributors?
All CYAT81688-100AS71T 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 CYAT81688-100AS71T meets industry standards.
7.What is the process for return or replacement of CYAT81688-100AS71T?
All CYAT81688-100AS71T units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81688-100AS71T, 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 CYAT81688-100AS71T part is unused and in its original packaging.
Return procedure for CYAT81688-100AS71T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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