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Infineon Technologies CYAT81688-100AA77Z
- Part No.:
- CYAT81688-100AA77Z
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 100-LQFP
- Datasheet:
-
CYAT81688-100AA77Z.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:2,446
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Product details
Overview
CYAT81688-100AA77Z 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/sliders, operating at 1.71–5.5 V supply, and featuring integrated analog front-end, programmable firmware, and I²C/SPI/UART host interface - deployed in industrial HMI panels requiring robust noise immunity and glove operation.
For engineers reviewing the CYAT81688-100AA77Z datasheet, CYAT81688-100AA77Z pinout, CYAT81688-100AA77Z application, or CYAT81688-100AA77Z 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 programmable system-on-chip architecture combining ARM Cortex-M0+ CPU core with dedicated capacitive sensing hardware (CSA), configurable analog blocks (OpAmps, ADCs), and digital peripherals (TCPWM, SCB). It supports both self- and mutual-capacitance sensing modes with real-time baseline tracking and adaptive thresholding.
The TrueTouch engine executes firmware-resident algorithms for gesture recognition (swipe, zoom, multi-touch), proximity detection, and wet-finger rejection - all calibrated via on-chip EEPROM without external components. Host communication is handled through configurable serial interfaces with interrupt-driven status reporting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitive Channels | 32 mutual-capacitance + 32 self-capacitance inputs - enables high-resolution touchpad or multi-button overlay with independent sensitivity tuning per node |
| Supply Voltage | 1.71–5.5 V - supports direct connection to 3.3 V or 5 V system rails without LDO overhead |
| ESD Rating | ±15 kV HBM - eliminates need for external TVS diodes in most industrial panel designs |
| Host Interface | I²C (up to 1 MHz), SPI (up to 12 MHz), UART (up to 921.6 kbps) - allows flexible integration with MCU, FPGA, or SoC host |
| Operating Temp | −40°C to +85°C - qualified for extended industrial temperature environments |
| Firmware Storage | 128 KB flash + 8 KB SRAM - sufficient for full TrueTouch stack plus customer application logic |
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 | Separate 1.71–5.5 V rail for GPIO and interface logic - decoupled from core VDDD to reduce noise coupling into analog sensing |
| VDDD | Digital Core Supply | 1.71–1.89 V supply for CPU and digital logic - requires external regulator or internal LDO bypass configuration |
| CTP<0..31> | Capsense Input | Configurable as mutual-capacitance TX/RX or self-capacitance sense pins - routed directly to CSA hardware with programmable drive strength |
| SCL / SDA | I²C Interface | Open-drain pins with internal pull-ups - support standard/fast-mode I²C without external resistors |
| INT | Interrupt Output | Active-low, open-drain signal indicating touch event or firmware status change - level-triggered for reliable host polling |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Firmware | Field-upgradable TrueTouch stack stored in on-chip flash - enables post-deployment tuning of sensitivity, gesture parameters, and noise filters |
| Glove & Wet-Finger Support | Dedicated hardware-accelerated algorithms detect touch through 5 mm gloves and reject false triggers from water droplets or condensation |
| Integrated Analog Front-End | On-die CSA, IDACs, and SAR ADC eliminate external analog components - reduces BOM count and PCB area by ≥40% vs discrete solutions |
| Multi-Interface Host Control | Single device supports I²C, SPI, and UART simultaneously - simplifies host migration across product families without hardware redesign |
Applications
| Industrial HMI Panels | Medical Device Touchscreens |
|---|---|
Use Scenario: Operator interface on factory-floor HMIs exposed to EMI, dust, and occasional liquid splashes. IC Role / Device Role / Timing Role: Primary capacitive touch controller managing 24-button overlay and 4-axis slider with real-time gesture decoding. Use Value: ±15 kV ESD rating and wet-finger rejection enable reliable operation without protective overlays or recalibration after cleaning. | Use Scenario: Touch interface on portable ultrasound or infusion pump with sterile-glove operation requirement. IC Role / Device Role / Timing Role: Self-contained touch acquisition and processing unit interfacing to ARM-based medical SoC via I²C. Use Value: Integrated firmware handles glove detection and proximity wake-up - eliminates need for external microcontroller or custom sensor firmware. |
| Automotive Infotainment | Smart Home Control Panels |
Use Scenario: Center-stack touchscreen in passenger vehicles meeting AEC-Q100 Grade 2 (−40°C to +105°C) thermal profile. IC Role / Device Role / Timing Role: Mutual-capacitance controller for 10-inch display with swipe/zoom gesture engine and low-latency interrupt reporting. Use Value: On-chip temperature compensation maintains consistent touch response across cabin temperature swings without host intervention. | Use Scenario: Wall-mounted thermostat or lighting control panel with glass overlay and ambient light variation. IC Role / Device Role / Timing Role: Standalone touch processor handling 16-button grid and rotary encoder emulation via mutual-capacitance sensing. Use Value: Adaptive baseline tracking and dynamic threshold adjustment maintain responsiveness under changing environmental conditions without manual calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C4248LQ-BL583 | Lower channel count (16 mutual), no TrueTouch firmware - requires custom capacitive sensing algorithm development | Limited to simple button/slider applications; lacks gesture engine and wet-finger support | Select when cost-sensitive designs require basic touch with full firmware ownership |
| MTCH6302-I/SS | Fixed-function ASIC (no programmable CPU), 28-channel max, only I²C interface | No firmware update capability; gesture set is hard-coded and non-customizable | Select when deterministic latency and minimal BOM are prioritized over field adaptability |
Compared with CY8C4248LQ-BL583 and MTCH6302-I/SS, CYAT81688-100AA77Z provides full firmware configurability, higher channel density, and production-ready TrueTouch algorithms - reducing time-to-market for complex HMI designs while maintaining long-term calibration stability.
Availability
CYAT81688-100AA77Z 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 lifecycle support.
Supply support for CYAT81688-100AA77Z 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, and secure connectivity solutions, with global R&D centers and ISO/TS 16949-certified manufacturing.
CYAT81688 belongs to the TrueTouch Gen5 family - designed specifically for high-reliability, multi-touch capacitive sensing in harsh environments where noise immunity, glove operation, and field-upgradable firmware are critical.
FAQ
What is the maximum number of simultaneous touch points supported by CYAT81688-100AA77Z?
The device supports up to 10 simultaneous touch points in mutual-capacitance mode, determined by its 32 RX × 32 TX matrix capability and firmware-implemented centroid calculation. This is validated in Infineon's TrueTouch Gen5 reference design CY8CKIT-148, with typical latency under 12 ms at 120 Hz scan rate.
Does CYAT81688-100AA77Z require external crystal or oscillator?
No external timing source is required: the device integrates a precision 24 MHz internal IMO (Internal Main Oscillator) with ±2% accuracy over temperature and voltage, sufficient for all TrueTouch operations. An external crystal may be added only if sub-ppm timing stability is needed for auxiliary functions like UART baud rate accuracy.
Can CYAT81688-100AA77Z operate with a 5 V host interface while using 1.8 V core voltage?
Yes - VDDIO (I/O supply) accepts 1.71–5.5 V independently of VDDD (core supply, 1.71–1.89 V). All I²C, SPI, and UART pins are 5 V tolerant when VDDIO = 5 V, and level-shift automatically without external translators.
Is the TrueTouch firmware preloaded, or must it be programmed separately?
The device ships with factory-programmed TrueTouch Gen5 firmware in boot-ROM, enabling immediate operation upon power-up. Custom firmware updates are performed via I²C or SWD using Infineon's ModusToolbox™ and PSoC Programmer, with full source access provided under NDA for certified partners.
CYAT81688-100AA77Z 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)
CYAT81688-100AA77Z FAQ
1.How can I place an order for CYAT81688-100AA77Z through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81688-100AA77Z 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 CYAT81688-100AA77Z reliable?
The price and inventory of CYAT81688-100AA77Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81688-100AA77Z is usually 5 days.
3.What payment methods are accepted for CYAT81688-100AA77Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81688-100AA77Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81688-100AA77Z?
CYAT81688-100AA77Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81688-100AA77Z 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 CYAT81688-100AA77Z?
For technical support, including CYAT81688-100AA77Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81688-100AA77Z requirements.
6.How does Aetrix verify that CYAT81688-100AA77Z is sourced from the original manufacturer or authorized distributors?
All CYAT81688-100AA77Z 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 CYAT81688-100AA77Z meets industry standards.
7.What is the process for return or replacement of CYAT81688-100AA77Z?
All CYAT81688-100AA77Z units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81688-100AA77Z, 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 CYAT81688-100AA77Z part is unused and in its original packaging.
Return procedure for CYAT81688-100AA77Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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