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Infineon Technologies CYAT81688-100AA77
- Part No.:
- CYAT81688-100AA77
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 100-LQFP
- Datasheet:
-
CYAT81688-100AA77.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:3,339
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Product details
Overview
CYAT81688-100AA77 from Infineon Technologies is a PSoC-based TrueTouch capacitive touchscreen controller IC with 100-pin TQFP package, supporting up to 32 sensing channels, 10-bit resolution, and integrated analog front-end for mutual-capacitance operation in mobile and industrial HMI applications.
For engineers reviewing the CYAT81688-100AA77 datasheet, CYAT81688-100AA77 pinout, CYAT81688-100AA77 application, or CYAT81688-100AA77 equivalent, key selection criteria include channel count, I²C/SPI interface support, built-in noise immunity algorithms, and operating voltage range (2.7–5.5 V).
Technical Context
This device integrates a programmable analog and digital system-on-chip architecture with dedicated capacitive sensing hardware, including sigma-delta modulators and programmable gain amplifiers for high-SNR touch signal acquisition. It supports both self- and mutual-capacitance scanning modes with configurable scan timing and resolution.
The controller implements on-chip firmware for gesture recognition (swipe, pinch, zoom), multi-touch tracking (up to 10 fingers), and real-time baseline compensation. Communication occurs via I²C (up to 1 MHz) or SPI (up to 12 MHz), with interrupt-driven host interaction and configurable GPIOs for system integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Touch Channels | 32 independent sensing channels enable high-resolution touch panels up to 10-inch diagonal with fine positional granularity. |
| ADC Resolution | 10-bit effective resolution provides sufficient dynamic range for detecting small capacitance changes (<0.1 pF) under noisy EMI conditions. |
| Interface | I²C (400 kHz standard / 1 MHz fast mode) and SPI (4-wire, up to 12 MHz) allow flexible host processor pairing without protocol translation. |
| Supply Voltage | 2.7–5.5 V operation supports direct connection to common system rails (3.3 V or 5 V), eliminating need for dedicated LDO. |
| Operating Temp | −40°C to +85°C rating qualifies for industrial and automotive cabin HMI deployments without derating. |
| Firmware Memory | On-chip flash (128 KB) stores calibrated touch algorithm and user-defined gesture logic, enabling field-upgradable behavior. |
Pinout & Package
Package: 100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, thermally enhanced for sustained touch scanning duty cycles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O supply rail | Supplies 1.71–5.5 V to all digital I/O pins; decoupling required per layout guidelines to prevent touch noise coupling. |
| VDDA | Analog supply rail | Provides clean 2.7–5.5 V to internal ADC, PGA, and sensor drivers; must be filtered separately from VDDIO. |
| SCL/SDA | I²C bidirectional bus | Open-drain pins requiring external pull-ups; support hot-plug detection and clock stretching for robust host synchronization. |
| MOSI/MISO/SCLK/SS | SPI interface signals | Full-duplex 4-wire SPI enables faster configuration and raw data streaming than I²C in high-channel-count systems. |
| INT | Interrupt output | Active-low open-drain signal asserts when new touch data is ready or gesture event occurs, reducing host polling overhead. |
| RESET | Hardware reset input | Asynchronous active-low pin initiates full internal state reset and firmware reload; debounced externally for reliable power-up sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Analog Front-End | Configurable sensor drive strength, integration time, and PGA gain allow optimization for varying panel thickness, overlay material, and electrode geometry. |
| Real-Time Baseline Tracking | Adaptive baseline update algorithm maintains sensitivity across temperature drift and slow environmental capacitance shifts without false triggers. |
| Multi-Finger Gesture Engine | Dedicated hardware accelerates centroid calculation, velocity estimation, and gesture classification (tap, double-tap, swipe, rotate) with <15 ms latency. |
| Noise Immunity Modes | Supports spread-spectrum modulation, frequency hopping, and correlated double sampling to reject 50/60 Hz mains, LCD VCOM, and RF interference. |
Applications
| Smartphone Display Interface | Industrial Control Panel |
|---|---|
Use Scenario: Capacitive touch overlay on 5.5-inch AMOLED display with curved edge bezel. IC Role / Device Role / Timing Role: Primary touch controller handling mutual-capacitance scanning, finger tracking, and I²C reporting to AP. Use Value: 10-finger tracking at 120 Hz scan rate ensures responsive UI navigation during multi-app gestures without frame drops. | Use Scenario: 7-inch resistive-to-capacitive retrofit on factory HMIs exposed to oil mist and ESD events. IC Role / Device Role / Timing Role: Standalone touch acquisition and preprocessing unit interfacing with PLC via SPI. Use Value: Built-in ESD protection (±15 kV air, ±8 kV contact) and wide-temp operation eliminate external protection components and thermal derating. |
| Medical Patient Monitor | Automotive Center Stack |
Use Scenario: Glove-operated 10-inch touch interface in sterile clinical environment with frequent alcohol wipe cleaning. IC Role / Device Role / Timing Role: Touch sensing subsystem with configurable sensitivity and wet-finger rejection logic. Use Value: Adjustable threshold and adaptive filtering maintain reliable detection through 2-mm glove thickness and surface moisture without recalibration. | Use Scenario: Integrated center console with haptic feedback and proximity wake-up for infotainment control. IC Role / Device Role / Timing Role: Dual-role controller managing main display touch and proximity sensor array via shared GPIOs. Use Value: Shared analog resources and firmware partitioning reduce BOM count while maintaining independent scan timing for touch and proximity functions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C4014LQI-422 | Lower channel count (16), no integrated mutual-capacitance hardware; relies on software-based scanning. | Suitable only for small panels (<4.3") with basic single-touch requirements. | Select when cost sensitivity outweighs multi-touch performance and panel scalability needs. |
| MTCH6302-I/ST | Dedicated mutual-capacitance controller with 24-channel limit and fixed firmware; no PSoC programmability. | Limited to fixed-gesture sets and non-upgradable algorithms; lacks analog configurability. | Choose for high-volume, low-feature HMI where firmware lock-in and minimal development effort are priorities. |
Compared with CY8C4014LQI-422 and MTCH6302-I/ST, CYAT81688-100AA77 offers scalable channel support, field-upgradable gesture logic, and hardware-accelerated multi-touch-critical for evolving HMI platforms requiring long-term design reuse and feature expansion.
Availability
CYAT81688-100AA77 is available at Aetrix Electronics and suitable for smartphone display interfaces, industrial control panels, and medical patient monitors requiring stable component supply and long-term production continuity.
Supply support for CYAT81688-100AA77 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 automotive, industrial, and consumer markets.
CYAT81688 belongs to the TrueTouch Gen5 family, designed specifically for high-reliability, multi-touch capacitive human-machine interfaces demanding robust noise immunity and field-upgradable functionality.
FAQ
What is the maximum supported panel size for CYAT81688-100AA77?
The device supports up to 10-inch diagonal panels using mutual-capacitance architecture with 32 channels. Maximum size depends on electrode pitch and trace routing; reference designs achieve full coverage at 100 pF total sensor capacitance with ≤200 Ω trace resistance per segment.
Does CYAT81688-100AA77 require external crystal or oscillator?
No external crystal is required. The device uses an internal precision RC oscillator for touch scanning timing and supports optional external 1–20 MHz crystal for enhanced system clock accuracy when synchronizing with host processors or audio subsystems.
Can the firmware be updated in the field after soldering?
Yes. Firmware updates are performed over I²C or SPI using Infineon's Bootloader Host Tool. The 128 KB on-chip flash supports dual-bank operation, enabling safe over-the-air updates with rollback capability and CRC-verified image loading.
What level of ESD protection does CYAT81688-100AA77 provide on its touch IOs?
The touch I/O pins are rated to ±15 kV (air discharge) and ±8 kV (contact discharge) per IEC 61000-4-2 Level 4. This eliminates need for external TVS diodes in most industrial and consumer applications when layout follows Infineon's recommended guard ring and spacing guidelines.
CYAT81688-100AA77 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)
CYAT81688-100AA77 FAQ
1.How can I place an order for CYAT81688-100AA77 through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81688-100AA77 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 CYAT81688-100AA77 reliable?
The price and inventory of CYAT81688-100AA77 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81688-100AA77 is usually 5 days.
3.What payment methods are accepted for CYAT81688-100AA77?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81688-100AA77 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81688-100AA77?
CYAT81688-100AA77 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81688-100AA77 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 CYAT81688-100AA77?
For technical support, including CYAT81688-100AA77 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81688-100AA77 requirements.
6.How does Aetrix verify that CYAT81688-100AA77 is sourced from the original manufacturer or authorized distributors?
All CYAT81688-100AA77 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 CYAT81688-100AA77 meets industry standards.
7.What is the process for return or replacement of CYAT81688-100AA77?
All CYAT81688-100AA77 units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81688-100AA77, 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 CYAT81688-100AA77 part is unused and in its original packaging.
Return procedure for CYAT81688-100AA77:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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