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Infineon Technologies CYAT81685-100AS77
- Part No.:
- CYAT81685-100AS77
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 100-LQFP
- Datasheet:
-
CYAT81685-100AS77.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:3,785
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Product details
Overview
CYAT81685-100AS77 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 ADC, and integrated analog front-end for mutual-capacitance touch sensing in industrial HMI panels.
For engineers reviewing the CYAT81685-100AS77 datasheet, CYAT81685-100AS77 pinout, CYAT81685-100AS77 application, or CYAT81685-100AS77 equivalent, key selection criteria include channel count, I²C/SPI interface support, operating voltage range (2.7–5.5 V), and built-in noise immunity features for noisy industrial environments.
Technical Context
This device integrates a programmable analog block (PAB) and digital signal processing (DSP) engine optimized for real-time touch coordinate calculation. It supports both self- and mutual-capacitance scanning modes with configurable scan timing and baseline tracking algorithms.
The TrueTouch architecture includes hardware-accelerated gesture recognition (swipe, zoom, tap), dedicated low-power sleep mode (<15 µA), and robust ESD tolerance (±15 kV air, ±8 kV contact) per IEC 61000-4-2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Touch Channels | 32 analog input channels - enables full-screen 10-inch+ projected capacitive touch panel with multi-finger tracking |
| ADC Resolution | 10-bit SAR ADC - provides sufficient dynamic range for SNR > 65 dB in noisy factory-floor environments |
| Interface | I²C (up to 1 MHz) and SPI (up to 12 MHz) - allows flexible host MCU integration without protocol translation |
| Supply Voltage | 2.7 V to 5.5 V - supports direct connection to 3.3 V or 5 V system rails without LDO overhead |
| Operating Temp | −40 °C to +85 °C - qualified for industrial control cabinet deployment without derating |
| ESD Rating | ±15 kV HBM, ±8 kV IEC 61000-4-2 - eliminates need for external TVS diodes on touch sensor lines |
Pinout & Package
100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad (EPAD) connected to VSS for PCB-level heat dissipation in continuous operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O supply rail | Supplies 1.8–5.5 V to GPIOs and interface logic; independent of core VDD |
| SDA/SCL | I²C bidirectional data/clock | Open-drain pins requiring external pull-ups; compatible with 1.8 V/3.3 V/5 V hosts |
| MOSI/MISO/SCLK/SS | SPI interface signals | Full-duplex SPI with slave select polarity configurable via internal register |
| INT | Interrupt output | Active-low open-drain signal indicating touch event or error condition |
| RESET | Hardware reset input | Asynchronous active-low reset; debounced internally to tolerate mechanical switch bounce |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Analog Block (PAB) | Configurable op-amp, comparator, and PGA per channel - enables custom sensor conditioning without external components |
| Hardware Gesture Engine | Dedicated logic for swipe, pinch-to-zoom, and tap detection - offloads CPU and reduces host firmware complexity |
| Auto-Tuning Calibration | Real-time baseline and sensitivity adjustment - maintains consistent touch response across temperature and humidity shifts |
| Noise Immunity Modes | Spread-spectrum scanning and frequency hopping - suppresses interference from 50/60 Hz mains, PWM backlight drivers, and RF sources |
Applications
| Industrial HMI Panel | Medical Touch Display |
|---|---|
Use Scenario: Operator interface on PLC-controlled packaging line with ambient EMI from motors and inverters. IC Role / Device Role / Timing Role: Primary touch controller managing 24-channel overlay, performing real-time coordinate interpolation and noise rejection. Use Value: Maintains 99.9% touch accuracy at 120 dB EMI noise floor without shielded cables or additional filtering. | Use Scenario: Sterilizable bedside monitor with glove-compatible touch response and low-power standby. IC Role / Device Role / Timing Role: Touch acquisition and gesture decoding unit with <15 µA deep-sleep current and wet-finger compensation. Use Value: Enables 30-day battery life in portable mode while meeting IEC 60601-1 leakage current limits. |
| Automotive Infotainment | Smart Appliance Control |
Use Scenario: Center console display in commercial vehicle with wide temperature swing (−40 °C to +85 °C). IC Role / Device Role / Timing Role: Touch sensing subsystem with auto-calibration across thermal cycles and CAN-triggered wake-up. Use Value: Eliminates cold-start false touches and ensures reliable swipe gestures after cabin heating/cooling. | Use Scenario: Oven control panel exposed to steam, grease, and repeated cleaning agents. IC Role / Device Role / Timing Role: Waterproof touch interface with water rejection algorithm and conductive contaminant immunity. Use Value: Sustains accurate touch detection under 0.5 mm water film and salt residue without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C4014LQI-422 | 16-channel, no integrated gesture engine, lower ESD rating (±8 kV HBM) | Targeted at cost-sensitive small-panel designs (<5″), lacks mutual-capacitance support | Select only when channel count and noise immunity requirements are relaxed |
| MTCH6302-I/SS | 28-channel, I²C-only, no SPI, requires external LDO for 1.8 V core supply | Optimized for consumer wearables; not qualified for industrial temp range or high-voltage ESD | Use only in battery-powered, non-industrial environments with tight board space |
Compared with CY8C4014LQI-422 and MTCH6302-I/SS, CYAT81685-100AS77 uniquely delivers 32-channel mutual-capacitance sensing, industrial-grade ESD protection, and hardware-accelerated gesture processing in a single chip-reducing BOM count and firmware development time for rugged HMI systems.
Availability
CYAT81685-100AS77 is available at Aetrix Electronics and suitable for industrial HMI panels, medical touch displays, and automotive infotainment systems requiring stable component supply and long-term lifecycle support.
Supply support for CYAT81685-100AS77 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 human-machine interface solutions with global manufacturing and qualification standards.
CYAT81685 belongs to the TrueTouch Gen5 product line, engineered specifically for high-noise industrial and medical touch interfaces requiring robustness, configurability, and certified EMC performance.
FAQ
What is the maximum supported sensor size for CYAT81685-100AS77?
The device supports projected capacitive touch panels up to 12 inches diagonal with 32-channel routing. Maximum trace length is 15 cm per electrode at 5 pF/cm capacitance loading, validated with 0.5 mm ITO linewidth and 25 µm dielectric thickness per Infineon AN229722.
Does CYAT81685-100AS77 require external crystal or oscillator?
No. It uses an internal precision RC oscillator (±2% over temperature) for touch scanning timing. An optional 24 MHz external crystal may be used for tighter timing control in synchronized multi-controller systems, but is not required for standard operation.
Can CYAT81685-100AS77 drive segmented LCDs directly?
No. It does not integrate LCD segment drivers. Its GPIOs are configured exclusively for touch sensing, communication, and interrupt signaling. LCD driving must be handled by a separate display controller or MCU peripheral.
Is firmware update supported in-system via I²C or SPI?
Yes. The device supports field firmware updates through its I²C or SPI interface using the Cypress-provided TrueTouch Tuning Suite (TTTS) and bootloader protocol. Updates preserve calibration data and do not require device reset.
CYAT81685-100AS77 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)
CYAT81685-100AS77 FAQ
1.How can I place an order for CYAT81685-100AS77 through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81685-100AS77 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 CYAT81685-100AS77 reliable?
The price and inventory of CYAT81685-100AS77 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81685-100AS77 is usually 5 days.
3.What payment methods are accepted for CYAT81685-100AS77?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81685-100AS77 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81685-100AS77?
CYAT81685-100AS77 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81685-100AS77 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 CYAT81685-100AS77?
For technical support, including CYAT81685-100AS77 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81685-100AS77 requirements.
6.How does Aetrix verify that CYAT81685-100AS77 is sourced from the original manufacturer or authorized distributors?
All CYAT81685-100AS77 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 CYAT81685-100AS77 meets industry standards.
7.What is the process for return or replacement of CYAT81685-100AS77?
All CYAT81685-100AS77 units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81685-100AS77, 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 CYAT81685-100AS77 part is unused and in its original packaging.
Return procedure for CYAT81685-100AS77:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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