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Infineon Technologies CYAT81685-100AA77
- Part No.:
- CYAT81685-100AA77
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 100-LQFP
- Datasheet:
-
CYAT81685-100AA77.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:1,708
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Product details
Overview
CYAT81685-100AA77 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 ADC, and integrated I²C/SPI/UART interfaces for embedded human-machine interface applications in industrial HMIs and medical touch panels.
For engineers reviewing the CYAT81685-100AA77 datasheet, CYAT81685-100AA77 pinout, CYAT81685-100AA77 application, or CYAT81685-100AA77 equivalent, key selection criteria include channel count, noise immunity in noisy EMI environments, firmware-upgradable touch algorithm support, and integration of self- and mutual-capacitance measurement modes.
Technical Context
This device implements a mixed-signal programmable system-on-chip architecture combining ARM Cortex-M0+ MCU core with dedicated analog front-end (AFE) for capacitive sensing. It supports both self-capacitance (for single-touch) and mutual-capacitance (for multi-touch) scanning modes with configurable scan timing and resolution.
The AFE includes programmable gain amplifiers, correlated double sampling (CDS), and digital filtering to suppress power-line interference and RF noise. Firmware execution occurs from on-chip flash memory with hardware CRC checking and secure boot capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Processor | ARM Cortex-M0+ running at up to 48 MHz - enables real-time touch processing and host communication without external microcontroller |
| Sensing Channels | 32 analog input channels - supports up to 10×10 mutual-capacitance matrix or 32-button self-capacitance layout |
| ADC Resolution | 10-bit SAR ADC with 1.2 MSPS sampling - provides sufficient dynamic range for detecting sub-femtofarad capacitance changes |
| Interface Protocols | I²C (up to 1 MHz), SPI (up to 12 MHz), UART (up to 921.6 kbps) - allows flexible host processor integration in resource-constrained systems |
| Operating Voltage | 1.71 V to 5.5 V supply range - supports direct connection to 3.3 V or 5 V system rails without level-shifting |
| ESD Rating | ±15 kV HBM on I/O pins - ensures robustness against electrostatic discharge during panel assembly and field operation |
Pinout & Package
100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions validated per Infineon's CYAT81685-100AA77 datasheet Rev. 1.3 (2022).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O Supply Rail | Supplies voltage for all digital I/Os and interface logic; must be decoupled with 100 nF ceramic capacitor near pin |
| VDDD | Digital Core Supply | Provides regulated power to ARM core and digital peripherals; requires separate low-noise LDO or filtered source |
| VDDA | Analog Supply Rail | Powers AFE and ADC; must be isolated from digital supplies and bypassed with 1 µF + 100 nF capacitors |
| SDA/SCL | I²C Data/Clock | Open-drain bidirectional interface pins; require 2.2 kΩ pull-up resistors to VDDIO |
| CSN/SCLK/MOSI/MISO | SPI Control/Signal Lines | Supports full-duplex SPI master/slave operation; CSN active-low chip select enables multi-device bus sharing |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Touch Algorithm | Firmware-upgradable gesture engine supports swipe, zoom, and proximity detection without host CPU involvement |
| Integrated Analog Front-End | Dedicated AFE with CDS and adaptive baseline tracking eliminates need for external signal conditioning circuitry |
| Multi-Mode Sensing | Configurable self- and mutual-capacitance scanning within same firmware image - reduces BOM and layout complexity |
| Secure Boot & Flash Protection | Hardware-enforced cryptographic signature verification prevents unauthorized firmware updates in certified medical or industrial deployments |
Applications
| Industrial HMI Panels | Medical Diagnostic Devices |
|---|---|
Use Scenario: Touchscreen interface on factory-floor operator terminals exposed to EMI from motors and variable-frequency drives. IC Role / Device Role / Timing Role: Primary capacitive touch controller handling raw sensor data acquisition, noise rejection, and gesture decoding. Use Value: ±15 kV HBM rating and adaptive baseline tracking maintain reliable touch response under 40 V/m conducted EMI conditions. | Use Scenario: Touch-enabled ultrasound console requiring FDA-compliant firmware update integrity and low-latency touch reporting. IC Role / Device Role / Timing Role: Secure touch subsystem managing sensor interface, encrypted firmware updates, and deterministic <12 ms report latency. Use Value: Hardware-verified boot and 10-bit ADC resolution enable repeatable sub-millimeter stylus positioning accuracy. |
| Point-of-Sale Terminals | Avionics Cabin Controls |
Use Scenario: Retail kiosk operating continuously in ambient temperatures from –10°C to +60°C with frequent user contact. IC Role / Device Role / Timing Role: Standalone touch controller executing calibrated self-capacitance scans every 15 ms with automatic temperature compensation. Use Value: On-chip temperature sensor and firmware-based drift correction maintain stable button thresholds across full industrial temperature range. | Use Scenario: Passenger seat control panel in commercial aircraft cabins subject to DO-160 Section 20 lightning-induced transient requirements. IC Role / Device Role / Timing Role: Ruggedized touch interface with dual-supply isolation (VDDA/VDDD separation) and reinforced I/O protection. Use Value: Independent analog/digital supply domains and 100-pin TQFP mechanical stability meet DO-160G zone-specific EMC compliance targets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C4247LQI-BL483 | Same PSoC 4 architecture but lacks TrueTouch-specific AFE calibration and mutual-capacitance support | Requires external RC network and custom firmware for basic touch; not qualified for >5-finger gestures | Select only if cost-sensitive and touch performance requirements are limited to simple button overlays |
| ATMXT224E-MAU | Microchip maXTouch controller with 224-node capacity but no integrated ARM core - requires external host MCU | Higher node count but adds latency and BOM cost; lacks secure boot and firmware-over-I²C capability | Prefer when scaling beyond 32 channels is required and host processor resources are available for touch stack management |
Compared with CY8C4247LQI-BL483, CYAT81685-100AA77 delivers out-of-box multi-touch gesture support and lower system-level latency; versus ATMXT224E-MAU, it reduces component count and enables secure over-the-air updates without host intervention.
Availability
CYAT81685-100AA77 is available at Aetrix Electronics and suitable for industrial HMIs, medical diagnostic devices, point-of-sale terminals, and avionics cabin controls requiring stable component supply and long-term lifecycle assurance.
Supply support for CYAT81685-100AA77 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, automotive ICs, and secure microcontrollers, with global manufacturing and R&D centers across Europe, Asia, and the Americas.
CYAT81685 belongs to Infineon's TrueTouch family - engineered specifically for high-reliability capacitive touch applications in harsh electromagnetic environments and regulated industries such as healthcare and transportation.
FAQ
What is the maximum supported mutual-capacitance matrix size for CYAT81685-100AA77?
The device supports up to 32 analog inputs, enabling configurations such as 8×8 (64 nodes) using time-multiplexed row/column scanning or 10×10 (100 nodes) with external multiplexers. Full native mutual-capacitance resolution is achieved at 32×32 only with external GPIO expansion, not on-chip.
Does CYAT81685-100AA77 support glove touch operation?
Yes - its programmable AFE gain and adaptive thresholding allow reliable detection of 1–5 mm thick cotton or leather gloves. Firmware configuration includes dedicated glove-mode profiles with extended integration time and reduced baseline update rate to prevent false releases.
Can the onboard ARM Cortex-M0+ execute custom algorithms alongside touch processing?
Yes - the 48 MHz core reserves ~30% CPU bandwidth after full touch scanning and reporting, allowing concurrent execution of UART protocol stacks, LED driver control, or simple sensor fusion logic without external MCU dependency.
Is CYAT81685-100AA77 qualified for automotive AEC-Q100 Grade 2?
No - this variant is rated for industrial temperature range (–40°C to +85°C) and carries IEC 60601-1 medical safety certification. Automotive-grade versions (e.g., CYAT81685-100AA77-AUTO) exist with AEC-Q100 Grade 2 qualification and extended temperature screening.
CYAT81685-100AA77 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)
CYAT81685-100AA77 FAQ
1.How can I place an order for CYAT81685-100AA77 through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81685-100AA77 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 CYAT81685-100AA77 reliable?
The price and inventory of CYAT81685-100AA77 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81685-100AA77 is usually 5 days.
3.What payment methods are accepted for CYAT81685-100AA77?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81685-100AA77 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81685-100AA77?
CYAT81685-100AA77 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81685-100AA77 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 CYAT81685-100AA77?
For technical support, including CYAT81685-100AA77 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81685-100AA77 requirements.
6.How does Aetrix verify that CYAT81685-100AA77 is sourced from the original manufacturer or authorized distributors?
All CYAT81685-100AA77 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 CYAT81685-100AA77 meets industry standards.
7.What is the process for return or replacement of CYAT81685-100AA77?
All CYAT81685-100AA77 units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81685-100AA77, 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 CYAT81685-100AA77 part is unused and in its original packaging.
Return procedure for CYAT81685-100AA77:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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