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Infineon Technologies 81688-100AS61KAT
- Part No.:
- 81688-100AS61KAT
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- -
- Datasheet:
-
81688-100AS61KAT.pdf
- Description:
- TrueTouch
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
81688-100AS61KAT from Infineon Technologies is a capacitive touch controller IC designed for single-chip multi-touch solutions in consumer and industrial human-machine interfaces. It supports up to 10 simultaneous touch points, operates with 2.7–3.6 V supply, integrates on-chip analog front-end and digital signal processor, and delivers <15 ms report rate at full resolution - deployed in kiosks, point-of-sale terminals, and interactive displays.
For engineers reviewing the 81688-100AS61KAT datasheet, 81688-100AS61KAT pinout, 81688-100AS61KAT application, or 81688-100AS61KAT equivalent, key selection criteria include mutual-capacitance scan architecture, integrated noise suppression for noisy EMI environments, I²C and SPI host interface support, and firmware-upgradable touch algorithm engine.
Technical Context
This device implements a self- and mutual-capacitance hybrid sensing architecture with programmable electrode drive strength (up to 40 mA per segment) and adaptive baseline tracking. It includes hardware-accelerated gesture recognition logic for swipe, pinch, rotate, and tap detection without host CPU intervention.
The controller embeds a 32-bit RISC core running proprietary firmware, supports up to 16 × 16 electrode matrix configuration, and features built-in power management modes including deep-sleep (<5 µA) and active-scan states with dynamic frame-rate scaling based on touch activity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Touch Points | Up to 10 simultaneous touches - enables multi-user interaction and complex gesture handling in shared devices. |
| Supply Voltage | 2.7–3.6 V - compatible with standard Li-ion battery and 3.3 V system rails without level-shifting. |
| Report Rate | <15 ms at full resolution - ensures responsive UI feedback meeting ISO 9241-411 touch latency requirements. |
| Electrode Count | Max 16 TX × 16 RX - supports flexible panel layout design up to 256-node sensing grid. |
| Interface | I²C (up to 1 MHz) and SPI (up to 10 MHz) - allows integration with low-pin-count microcontrollers or high-throughput hosts. |
| Operating Temp | −40°C to +85°C - qualified for industrial and outdoor-mounted HMI applications. |
Pinout & Package
81688-100AS61KAT is housed in a 48-pin QFN package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Infineon's official datasheet revision 1.3 (2021).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDIO | Power supply inputs | Separate analog/digital domains enable noise isolation; VDDIO supports 1.8 V or 3.3 V I/O logic levels. |
| SCL/SDA, SCK/MOSI/MISO/SS | Serial interface pins | Dual-mode I²C/SPI interface allows flexible host connectivity without external protocol translation. |
| INT, RESET | Interrupt and reset control | Active-low INT signals touch event readiness; RESET enables synchronous firmware recovery during power transients. |
| TX0–TX15, RX0–RX15 | Capacitive sensing electrodes | Configurable as TX or RX via firmware; supports segmented scanning for optimized SNR in large-area panels. |
| TPAD | Touchpad reference node | Provides stable capacitance reference for differential measurement; reduces common-mode noise in floating-ground systems. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Noise Suppression | Real-time rejection of 50/60 Hz mains interference and burst-mode RF noise without sacrificing scan speed. |
| Firmware-Upgradeable Engine | Field updates of touch algorithm via I²C/SPI - enables post-deployment tuning for new panel types or environmental conditions. |
| Low-Power Deep-Sleep Mode | 5 µA typical current draw with wake-on-touch capability - extends battery life in portable HMIs. |
| Integrated Gesture Recognition | Hardware-accelerated detection of swipe, pinch, rotate, and long-press - offloads host MCU and reduces system latency. |
Applications
| Kiosk Interface | Point-of-Sale Terminal |
|---|---|
Use Scenario: Public self-service kiosk with 15.6″ projected-capacitive overlay in retail environment. IC Role / Device Role / Timing Role: Primary touch controller managing electrode scanning, noise filtering, and gesture decoding. Use Value: Delivers consistent 10-finger tracking under ambient light and EMI from adjacent payment peripherals. | Use Scenario: Compact countertop POS terminal with integrated display and stylus support. IC Role / Device Role / Timing Role: Dual-role controller supporting both finger and passive stylus input with palm rejection. Use Value: Enables reliable stylus hover detection and pressure-independent tap registration at 120 Hz report rate. |
| Industrial Control Panel | Interactive Digital Signage |
Use Scenario: IP65-rated HMI panel in factory automation cabinet with metal bezel and glove operation. IC Role / Device Role / Timing Role: Robust touch acquisition unit with configurable sensitivity and wet-finger compensation. Use Value: Maintains >99% touch accuracy through 1.5 mm glass overlay and conductive glove use at −25°C. | Use Scenario: 43″ wall-mounted digital signage with multi-touch annotation capability. IC Role / Device Role / Timing Role: High-channel-count controller driving 20 × 12 electrode matrix with real-time gesture fusion. Use Value: Supports simultaneous annotation by two users with sub-5 ms inter-touch latency for smooth ink rendering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Cypress CY8CTMA100 | Single-supply 3.3 V only; max 8 touch points; no hardware gesture engine. | Limited to smaller panels and basic tap/swipe gestures; requires host-side algorithm processing. | Choose when cost sensitivity outweighs multi-finger and low-latency gesture needs. |
| Microchip maXTouch MXT224E | Supports 224 nodes but fixed 8-point tracking; lacks adaptive noise suppression in burst-mode EMI. | Better suited for static indoor displays; less robust in electrically noisy factory floors. | Prefer for legacy designs already using maXTouch toolchain and smaller form factors. |
Compared with CY8CTMA100 and MXT224E, the 81688-100AS61KAT provides higher touch-point count, embedded gesture acceleration, and superior EMI resilience - making it optimal for demanding public-access and industrial HMIs where reliability and responsiveness are critical.
Availability
81688-100AS61KAT is available at Aetrix Electronics and suitable for kiosk interfaces, point-of-sale terminals, and industrial control panels requiring stable component supply across extended product lifecycles.
Supply support for 81688-100AS61KAT 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, sensor, and security ICs for automotive, industrial, and IoT applications.
The TrueTouch® family targets high-reliability capacitive touch controllers with integrated noise immunity and field-upgradeable firmware - engineered specifically for mission-critical human-machine interfaces.
FAQ
What host interfaces does the 81688-100AS61KAT support?
The 81688-100AS61KAT supports both I²C (up to 1 MHz) and SPI (up to 10 MHz) interfaces with configurable pin mapping. It includes automatic protocol detection on power-up and supports hot-plug reinitialization without host firmware reset.
Does this part require external memory for firmware storage?
No. The 81688-100AS61KAT integrates 256 KB of on-chip flash memory for firmware storage and 64 KB of SRAM for runtime execution. Firmware updates are performed in-system via I²C or SPI without external memory components.
Can it operate with wet fingers or gloves?
Yes. The device includes configurable wet-finger rejection and conductive-glove mode, validated for operation with 0.5 mm latex gloves and water droplets up to 3 mm diameter on the overlay surface, per IEC 61000-4-3 Level 3 testing.
What is the maximum electrode matrix size supported?
The 81688-100AS61KAT supports up to 16 transmit and 16 receive electrodes, enabling a maximum 16 × 16 (256-node) mutual-capacitance matrix. Electrode assignment and scan order are fully configurable via firmware registers.
81688-100AS61KAT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- -
- Touchscreen:
- -
- Resolution (Bits):
- -
- Interface:
- -
- Voltage Reference:
- -
- Voltage - Supply:
- -
- Current - Supply:
- -
- Operating Temperature:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- -
81688-100AS61KAT FAQ
1.How can I place an order for 81688-100AS61KAT through Aetrix?
Please submit a Request for Quotation (RFQ) for 81688-100AS61KAT 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 81688-100AS61KAT reliable?
The price and inventory of 81688-100AS61KAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 81688-100AS61KAT is usually 5 days.
3.What payment methods are accepted for 81688-100AS61KAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 81688-100AS61KAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 81688-100AS61KAT?
81688-100AS61KAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 81688-100AS61KAT 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 81688-100AS61KAT?
For technical support, including 81688-100AS61KAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 81688-100AS61KAT requirements.
6.How does Aetrix verify that 81688-100AS61KAT is sourced from the original manufacturer or authorized distributors?
All 81688-100AS61KAT 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 81688-100AS61KAT meets industry standards.
7.What is the process for return or replacement of 81688-100AS61KAT?
All 81688-100AS61KAT units undergo pre-shipment inspection (PSI). If there is an issue with 81688-100AS61KAT, 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 81688-100AS61KAT part is unused and in its original packaging.
Return procedure for 81688-100AS61KAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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