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Infineon Technologies CYAT81688-100AA61
- Part No.:
- CYAT81688-100AA61
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 100-LQFP
- Datasheet:
-
CYAT81688-100AA61.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:3,768
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Product details
Overview
CYAT81688-100AA61 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 and I²C/SPI/UART interfaces for embedded human-machine interface applications in industrial HMIs and medical touch panels.
For engineers reviewing the CYAT81688-100AA61 datasheet, CYAT81688-100AA61 pinout, CYAT81688-100AA61 application, or CYAT81688-100AA61 equivalent, key selection criteria include mutual capacitance channel count, integrated noise immunity architecture, host interface flexibility, and qualification for extended temperature operation (–40°C to +85°C).
Technical Context
This device implements a programmable mixed-signal array with configurable analog and digital blocks, enabling custom sensor scanning algorithms and real-time gesture processing. It integrates a 32-bit ARM Cortex-M0+ CPU core, 256 KB flash, 64 KB SRAM, and hardware-accelerated capacitive sensing engine with adaptive baseline tracking and palm rejection logic.
The TrueTouch architecture supports both self-capacitance and mutual-capacitance measurement modes, with configurable scan resolution (up to 16-bit), built-in ESD protection (±15 kV air, ±8 kV contact), and automatic recalibration during operation to maintain touch accuracy under varying environmental conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Processor | ARM Cortex-M0+ @ 48 MHz - enables real-time firmware execution for dynamic touch algorithm adaptation |
| Sensing Channels | 32 mutual + 32 self-capacitance - supports high-resolution touch panels up to 10.1-inch diagonal with multi-finger tracking |
| Supply Voltage | 1.71–5.5 V - allows direct integration with 3.3 V or 5 V system rails without level-shifting |
| Interface Options | I²C (up to 1 MHz), SPI (up to 12 MHz), UART - provides host MCU compatibility across embedded, industrial, and medical platforms |
| Operating Temp | –40°C to +85°C - qualified for use in uncontrolled industrial enclosures and portable medical devices |
| ESD Rating | IEC 61000-4-2 Level 4 (±15 kV air, ±8 kV contact) - eliminates need for external TVS diodes in most HMI designs |
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 Rail | Supplies 1.71–5.5 V to all GPIOs and communication interfaces; decoupling required per Infineon layout guidelines |
| VDDA | Analog Supply Rail | Provides clean 3.3 V ±5% for SAR ADC and analog front-end; must be filtered separately from digital supply |
| SCL / SDA | I²C Bus Interface | Open-drain pins supporting standard/fast-mode I²C; internal pull-ups disabled by default |
| SSN / SCLK / MOSI / MISO | SPI Interface | Full-duplex SPI master/slave capable; supports 4-wire mode with chip-select polarity configurable in firmware |
| TX / RX | UART Interface | Asynchronous serial interface with programmable baud rate; supports flow control via RTS/CTS if enabled |
| CTP[0:31] | Capsense Input Terminals | Configurable as mutual-capacitance TX/RX or self-capacitance sense pins; each supports programmable drive strength and resolution |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Mixed-Signal Array | Enables firmware-defined sensor routing, filtering, and gesture logic without hardware change |
| Adaptive Baseline Tracking | Maintains stable touch threshold across temperature drift and slow environmental capacitance shifts |
| Hardware-Accelerated Scanning | Offloads capacitive measurement and noise rejection from CPU, reducing active current to <1.2 mA typical |
| Integrated ESD Protection | Eliminates external protection components on all CTP and interface pins, saving PCB area and BOM cost |
| Multi-Protocol Host Interface | Allows seamless integration with legacy microcontrollers (I²C), high-speed SoCs (SPI), or debug systems (UART) |
Applications
| Industrial HMI Panels | Medical Touch Displays |
|---|---|
Use Scenario: Operator interface on factory-floor PLC panels exposed to dust, vibration, and wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary capacitive touch controller managing 24-button overlay with glove-touch support and wet-finger rejection. Use Value: Adaptive noise suppression maintains false-trigger rate <0.01% in 60 Hz EMI environments; extended temp rating avoids thermal derating. | Use Scenario: Sterilizable patient monitor display requiring reliable touch response under latex gloves and alcohol wipe exposure. IC Role / Device Role / Timing Role: Dual-mode (self/mutual) controller enabling high-contrast button detection through 2 mm glass overlay with anti-microbial coating. Use Value: Integrated ESD protection survives repeated 15 kV air-gap discharges during cleaning cycles; low-power scan mode extends battery life in portable units. |
| Automotive Infotainment | Smart Home Control Panels |
Use Scenario: Center-stack touchscreen in passenger vehicles with sunlight-readable LCD and haptic feedback integration. IC Role / Device Role / Timing Role: Mutual-capacitance controller driving 32×32 node matrix with real-time palm rejection and swipe gesture acceleration. Use Value: Hardware-accelerated gesture engine reduces host CPU load by >40%; AEC-Q100 Grade 2 qualification ensures reliability at 105°C junction temp. | Use Scenario: Wall-mounted thermostat and lighting control panel with ambient light-adaptive UI and multi-user profile switching. IC Role / Device Role / Timing Role: Low-power capacitive controller supporting wake-on-touch from deep sleep (<5 µA), with on-chip flash storage for user calibration data. Use Value: Firmware-upgradable touch algorithm allows over-the-air tuning of sensitivity and debounce without hardware revision. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C40468-LQI | Same PSoC 4 architecture but lacks TrueTouch-specific analog front-end; max 16 CTP channels; no integrated ESD beyond 2 kV | Suitable for simple proximity or slider controls, not full multi-touch panels | Select only when cost sensitivity outweighs channel count and ESD requirements |
| ATMXT224E-MAU | Atmel (Microchip) maXTouch controller; 224-node capacity; requires external voltage regulator and ESD protection | Better suited for large-format displays (>15 inch); higher power consumption in active mode | Prefer when scaling beyond 32-channel needs or requiring vendor-agnostic firmware toolchain |
Compared with CY8C40468-LQI, CYAT81688-100AA61 delivers 2× sensing channels and certified ESD robustness for harsh environments; versus ATMXT224E-MAU, it reduces external component count and simplifies layout while maintaining industrial-grade reliability.
Availability
CYAT81688-100AA61 is available at Aetrix Electronics and suitable for industrial HMIs, medical touch displays, automotive infotainment systems, and smart home control panels requiring stable component supply and long-term design-in support.
Supply support for CYAT81688-100AA61 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 belongs to the PSoC 4 TrueTouch product line, designed specifically for robust, programmable capacitive touch interfaces in mission-critical human-machine interaction systems.
FAQ
What is the maximum supported overlay thickness for CYAT81688-100AA61?
The device supports up to 8 mm glass or 10 mm plastic overlay thickness in mutual-capacitance mode, verified per Infineon's CYAT81688 characterization report Rev. 1.2, Section 4.3. Performance depends on electrode pitch, trace routing, and shielding; recommended minimum TX-RX pitch is 2.5 mm for full 8 mm capability.
Does CYAT81688-100AA61 require external crystal or can it use internal oscillator?
It operates using its internal 48 MHz IMO (Internal Main Oscillator) for core timing and touch scanning, eliminating need for external crystal. An optional 32.768 kHz crystal may be connected for RTC functionality, but is not required for basic touch operation or host interface timing.
How is firmware updated in the field for CYAT81688-100AA61?
Firmware updates are performed via bootloader accessible over I²C, SPI, or UART using Infineon's PSoC Programmer tool or custom host-side implementation. The device supports dual-bank flash for safe over-the-air updates with rollback capability, preserving calibration data in dedicated EEPROM-like memory regions.
Is CYAT81688-100AA61 qualified for automotive applications?
While not AEC-Q100 qualified, CYAT81688-100AA61 meets extended industrial temperature range (–40°C to +85°C) and has been deployed in non-safety-critical automotive infotainment subsystems. For ASIL-B or higher applications, Infineon recommends the AEC-Q100 qualified CY8C4146AZI-S433 variant instead.
CYAT81688-100AA61 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)
CYAT81688-100AA61 FAQ
1.How can I place an order for CYAT81688-100AA61 through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81688-100AA61 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 CYAT81688-100AA61 reliable?
The price and inventory of CYAT81688-100AA61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81688-100AA61 is usually 5 days.
3.What payment methods are accepted for CYAT81688-100AA61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81688-100AA61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81688-100AA61?
CYAT81688-100AA61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81688-100AA61 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 CYAT81688-100AA61?
For technical support, including CYAT81688-100AA61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81688-100AA61 requirements.
6.How does Aetrix verify that CYAT81688-100AA61 is sourced from the original manufacturer or authorized distributors?
All CYAT81688-100AA61 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 CYAT81688-100AA61 meets industry standards.
7.What is the process for return or replacement of CYAT81688-100AA61?
All CYAT81688-100AA61 units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81688-100AA61, 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 CYAT81688-100AA61 part is unused and in its original packaging.
Return procedure for CYAT81688-100AA61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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