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Infineon Technologies 81688-100AS71KA
- Part No.:
- 81688-100AS71KA
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- -
- Datasheet:
-
81688-100AS71KA.pdf
- Description:
- TrueTouch
- Quantity:
- Payment:
- Shipping:
Inventory:3,434
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Product details
Overview
81688-100AS71KA from Infineon Technologies is a capacitive touch controller IC designed for single- or multi-finger gesture detection in human-machine interface applications. It supports up to 10 sensing channels, operates from 2.7 V to 5.5 V, delivers <1.5 µA deep-sleep current, and integrates on-chip auto-tuning for drift compensation in consumer electronics touch panels.
For engineers reviewing the 81688-100AS71KA datasheet, 81688-100AS71KA pinout, 81688-100AS71KA application, or 81688-100AS71KA equivalent, key selection criteria include channel count, supply voltage range, sleep-mode power, built-in calibration logic, and I²C/SPI interface compatibility with host microcontrollers.
Technical Context
The device implements a self-capacitance measurement architecture with sigma-delta ADCs per channel and real-time baseline tracking. It embeds firmware-based noise rejection algorithms tuned for LCD proximity interference and finger hover sensitivity down to 15 mm.
Communication occurs via configurable I²C (up to 400 kHz) or 3-wire SPI, with interrupt-driven reporting of touch events, gesture type (swipe, tap, hold), and coordinate resolution up to 12-bit X/Y position data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Sensing Channels | 10 - Supports full-size touchpads or segmented control surfaces without external multiplexing |
| Supply Voltage Range | 2.7 V to 5.5 V - Compatible with single-cell Li-ion, USB-powered, and 3.3/5 V system rails |
| Deep-Sleep Current | <1.5 µA - Enables battery-operated devices to achieve multi-month standby life |
| Interface Type | I²C or 3-wire SPI - Allows flexible host MCU integration without requiring dedicated touch controllers |
| Touch Resolution | 12-bit X/Y - Delivers sub-millimeter positional accuracy for precise gesture recognition |
| Auto-Tuning Capability | On-chip baseline & drift compensation - Eliminates need for manual recalibration during temperature/humidity shifts |
Pinout & Package
81688-100AS71KA is housed in a 32-pin QFN package (5 mm × 5 mm, 0.5 mm pitch) with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary analog/digital core supply; requires local 1 µF ceramic decoupling |
| GND | Ground reference | Common return path for analog sensing and digital logic; tied to thermal pad |
| SCL / SDA | I²C clock/data lines | Open-drain, 3.3 V tolerant; support standard/fast-mode I²C up to 400 kHz |
| CS / SCLK / MOSI / MISO | SPI interface signals | Configurable as alternative to I²C; CS active-low enables multi-device sharing |
| INT | Interrupt output | Push-pull, active-low signal indicating new touch event or gesture completion |
| SENSE0–SENSE9 | Capacitive sensor inputs | Dedicated analog inputs for electrode connections; internally biased and sampled |
Key Features
| Feature | Design Value |
|---|---|
| Integrated auto-calibration engine | Adjusts baseline and sensitivity dynamically across temperature and humidity without host intervention |
| Multi-gesture recognition firmware | On-device classification of tap, double-tap, swipe, and hold - reduces host CPU load |
| Low-power deep-sleep mode | Wakes only on electrode delta change > threshold; maintains state in retention RAM |
| EMI-hardened sensing architecture | Rejects common-mode noise from LCD drivers and switching PSUs up to 100 Vpp |
Applications
| Smart Home Control Panel | Industrial HMI Terminal |
|---|---|
Use Scenario: Wall-mounted thermostat with glass-front touch interface requiring reliable operation under varying ambient light and condensation. IC Role / Device Role / Timing Role: Primary capacitive touch acquisition and gesture decoding unit; interfaces directly to ARM Cortex-M host via I²C. Use Value: On-chip auto-tuning maintains consistent touch response despite seasonal humidity swings and surface contamination. | Use Scenario: Factory-floor operator terminal with glove-compatible touch input and ESD exposure up to ±8 kV contact discharge. IC Role / Device Role / Timing Role: Robust touch controller handling 10-channel button grid and directional swipe navigation. Use Value: EMI-hardened architecture suppresses noise from nearby VFDs and motor drives without shielding. |
| Portable Medical Device UI | Automotive Infotainment Trim |
Use Scenario: Handheld glucose meter with sealed front panel and battery life target >1 year on CR2032. IC Role / Device Role / Timing Role: Low-power touch coordinator managing 6-button layout and scroll wheel emulation. Use Value: Deep-sleep current <1.5 µA extends battery life while preserving touch readiness. | Use Scenario: Center console trim with haptic feedback overlay and ambient temperature range −40°C to +85°C. IC Role / Device Role / Timing Role: Temperature-stable touch sensor hub feeding position data to vehicle infotainment SoC. Use Value: Built-in thermal drift compensation ensures consistent actuation thresholds across automotive operating range. |
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 CY8CMBR2016 | 16-channel capacity; higher max supply (5.5 V); no integrated gesture engine - requires host-side processing | Better suited for larger touch surfaces but increases firmware development effort | Select when scaling beyond 10 electrodes or needing higher channel density |
| Microchip AT42QT1070 | 7-channel; fixed I²C address; no SPI option; 3.0–5.5 V supply; 2.5 µA sleep current | Limited to smaller UIs; lacks multi-gesture firmware and auto-tuning sophistication | Choose for cost-sensitive, low-channel-count designs where host resources are abundant |
Compared with CY8CMBR2016 and AT42QT1070, the 81688-100AS71KA provides balanced channel count, lowest sleep current, and autonomous gesture processing - reducing host dependency and extending battery life in compact UIs.
Availability
81688-100AS71KA is available at Aetrix Electronics and suitable for smart home control panels, industrial HMI terminals, and portable medical device UIs requiring stable component supply and long-term production continuity.
Supply support for 81688-100AS71KA 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 security solutions for automotive, industrial, and IoT markets.
The TrueTouch® product line delivers highly integrated, low-power capacitive touch controllers optimized for reliability in harsh environments and seamless integration into resource-constrained embedded systems.
FAQ
What communication interfaces does the 81688-100AS71KA support?
The 81688-100AS71KA supports both I²C (standard and fast mode up to 400 kHz) and 3-wire SPI. Interface selection is configured at power-up via dedicated pins. No external level shifters are needed for 3.3 V host systems, and all digital I/Os are 5 V tolerant.
Does the device require external calibration during operation?
No. The 81688-100AS71KA performs continuous on-chip auto-calibration of baseline and sensitivity using its internal algorithm. This eliminates factory calibration steps and compensates for environmental drift, including temperature gradients and moisture buildup on cover lenses.
Can it detect touch through thick glass or plastic overlays?
Yes. With proper electrode design and tuning, the device achieves reliable detection through up to 8 mm of glass or 10 mm of plastic. Its programmable sensitivity and noise rejection allow optimization for specific overlay thicknesses and dielectric properties without hardware changes.
Is the 81688-100AS71KA qualified for automotive applications?
No. While it operates across −40°C to +85°C, the 81688-100AS71KA is not AEC-Q200 qualified and lacks automotive-specific fault diagnostics or ASIL compliance. It is intended for industrial and consumer applications meeting IEC 61000-4-2 (ESD) and IEC 61000-4-3 (radiated immunity) standards.
81688-100AS71KA 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:
- -
81688-100AS71KA FAQ
1.How can I place an order for 81688-100AS71KA through Aetrix?
Please submit a Request for Quotation (RFQ) for 81688-100AS71KA 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 81688-100AS71KA reliable?
The price and inventory of 81688-100AS71KA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 81688-100AS71KA is usually 5 days.
3.What payment methods are accepted for 81688-100AS71KA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 81688-100AS71KA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 81688-100AS71KA?
81688-100AS71KA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 81688-100AS71KA 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 81688-100AS71KA?
For technical support, including 81688-100AS71KA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 81688-100AS71KA requirements.
6.How does Aetrix verify that 81688-100AS71KA is sourced from the original manufacturer or authorized distributors?
All 81688-100AS71KA 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 81688-100AS71KA meets industry standards.
7.What is the process for return or replacement of 81688-100AS71KA?
All 81688-100AS71KA units undergo pre-shipment inspection (PSI). If there is an issue with 81688-100AS71KA, 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 81688-100AS71KA part is unused and in its original packaging.
Return procedure for 81688-100AS71KA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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