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Infineon Technologies 81688-100AS61KA
- Part No.:
- 81688-100AS61KA
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- -
- Datasheet:
-
81688-100AS61KA.pdf
- Description:
- TrueTouch
- Quantity:
- Payment:
- Shipping:
Inventory:3,845
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Product details
Overview
81688-100AS61KA from Infineon Technologies is a capacitive touch controller IC designed for single-finger, self-capacitive sensing in human-interface applications. It integrates an 8-channel analog front-end, supports up to 8 independent touch buttons, operates from 2.7 V to 5.5 V supply, features built-in auto-calibration, and is qualified for industrial temperature range (−40 °C to +85 °C). It is used in appliance control panels requiring robust noise immunity and low-power wake-on-touch operation.
For engineers reviewing the 81688-100AS61KA datasheet, 81688-100AS61KA pinout, 81688-100AS61KA application, or 81688-100AS61KA equivalent, key selection criteria include channel count, supply voltage range, integrated calibration logic, I²C interface timing, and ESD tolerance per IEC 61000-4-2 Level 4.
Technical Context
This device implements a dedicated self-capacitive measurement architecture with sigma-delta ADCs per channel and digital baseline tracking. It uses a fixed-frequency 125 kHz excitation signal and supports programmable scan intervals from 10 ms to 255 ms.
The internal state machine handles touch detection, debounce, and report generation without host intervention. Communication occurs via standard-mode I²C (up to 400 kHz), with configurable slave address and interrupt-driven status signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Touch Channels | 8 independent self-capacitive sensing inputs - enables compact button arrays without external multiplexing |
| Supply Voltage | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V system rails |
| Operating Temp | −40 °C to +85 °C - meets industrial-grade environmental requirements |
| I²C Interface | Standard-mode (100 kHz) and fast-mode (400 kHz) - supports legacy and higher-speed host controllers |
| ESD Rating | ±8 kV HBM - ensures reliability in exposed front-panel implementations |
| Scan Interval | Programmable 10–255 ms - balances responsiveness and power consumption in battery-operated devices |
Pinout & Package
81688-100AS61KA is housed in a 16-pin QFN package (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Connects to main 2.7–5.5 V rail; requires local 100 nF decoupling |
| GND | Ground reference | Common return path for analog and digital sections; ties to thermal pad |
| SCL | I²C clock input | Open-drain, requires pull-up to VDD; defines communication timing |
| SDA | I²C data bidirectional | Open-drain, shares pull-up with SCL; carries address, command, and report data |
| INT | Interrupt output | Active-low open-drain signal indicating touch event or error condition |
| RESET | Hardware reset input | Pulled high internally; driven low to force cold start and register reset |
| CH0–CH7 | Capacitive sensor inputs | High-impedance analog inputs; each connects directly to a PCB trace electrode |
Key Features
| Feature | Design Value |
|---|---|
| Auto-calibration engine | Continuously adjusts baseline thresholds to compensate for environmental drift and contamination |
| Dedicated touch state machine | Offloads host MCU by autonomously managing scan sequencing, debouncing, and report generation |
| Low-power wake-on-touch | Consumes <15 µA in standby while maintaining full sensitivity to initiate system wake-up |
| Integrated noise rejection | Rejects 50/60 Hz mains interference and burst noise via synchronized sampling and digital filtering |
Applications
| Home Appliance Control Panel | Industrial HMI Keypad |
|---|---|
Use Scenario: Touch-sensitive front panel on microwave oven or induction cooktop. IC Role / Device Role / Timing Role: Primary capacitive touch acquisition and reporting unit; generates interrupt upon valid touch detection. Use Value: Enables sealed, waterproof overlay design with no mechanical wear; supports multi-button simultaneous press detection. | Use Scenario: Operator interface on PLC-mounted control box in factory automation. IC Role / Device Role / Timing Role: Standalone touch sensor hub interfacing to RS-485 gateway MCU via I²C. Use Value: Eliminates need for external ADC or GPIO expansion; withstands ESD events common in industrial environments. |
| Smart Thermostat Interface | Medical Device Front Panel |
Use Scenario: Wall-mounted HVAC controller with ambient light-adaptive backlight and touch feedback. IC Role / Device Role / Timing Role: Touch sensing subsystem providing filtered, debounced button states over I²C. Use Value: Delivers consistent response across temperature extremes and varying humidity levels. | Use Scenario: Patient monitor with glove-compatible touch controls in clinical settings. IC Role / Device Role / Timing Role: Low-noise, high-reliability touch acquisition node meeting IEC 60601-1 creepage and ESD requirements. Use Value: Supports reliable actuation through medical gloves and maintains immunity to RF interference from adjacent equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C201A0-SX24 | 24-V QFN, 12-bit SAR ADC, no integrated auto-calibration; requires host firmware tuning | Higher channel count but greater host software overhead and calibration maintenance | Preferred when system already uses Cypress PSoC ecosystem and requires mixed-signal flexibility |
| AT42QT1070-SSUR | 7-channel, 1.8–5.5 V supply, no interrupt pin; reports via I²C only on polling | Lacks hardware interrupt and has one fewer channel; lower ESD rating (±4 kV) | Selected for cost-sensitive, low-channel-count designs where polling latency is acceptable |
Compared with CY8C201A0-SX24 and AT42QT1070-SSUR, the 81688-100AS61KA offers superior out-of-box usability via autonomous calibration and deterministic interrupt signaling-reducing firmware development time and improving field reliability in uncontrolled environments.
Availability
81688-100AS61KA is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMIs, and smart thermostat interfaces requiring stable component supply and long-term manufacturability.
Supply support for 81688-100AS61KA 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 human-interface solutions with global manufacturing and quality certification to ISO/TS 16949 and ISO 9001.
The TrueTouch® family targets robust, low-power capacitive touch sensing for consumer and industrial applications-designed to replace mechanical switches with sealed, durable, and ESD-hardened interfaces.
FAQ
What is the maximum recommended trace length between CHx pins and the touch electrode?
The datasheet specifies ≤8 cm for single-ended electrode traces with 5–10 pF parasitic capacitance. Longer traces increase susceptibility to noise and reduce signal-to-noise ratio, potentially triggering false touches or missed detections. Layout guidelines require guard traces and ground stitching around sensor lines.
Does 81688-100AS61KA support proximity sensing or only direct touch?
No-it is designed exclusively for direct touch detection using self-capacitance measurement. It lacks the sensitivity and algorithmic support for proximity (hover) mode. Proximity capability requires mutual-capacitance architecture and dedicated firmware, which this device does not implement.
Can multiple 81688-100AS61KA devices share the same I²C bus?
Yes-each device supports two I²C slave addresses (0x2A and 0x2B) selected via ADDR pin configuration. Up to two units can coexist on one bus without address conflict; additional units require GPIO-based bus multiplexing or separate I²C peripherals.
Is the exposed thermal pad electrically connected internally?
No-the thermal pad is internally connected only to GND and must be soldered to a PCB GND plane for thermal dissipation and EMI reduction. It is not tied to any other potential and must not be left floating or connected to VDD or signal nets.
81688-100AS61KA 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:
- -
81688-100AS61KA FAQ
1.How can I place an order for 81688-100AS61KA through Aetrix?
Please submit a Request for Quotation (RFQ) for 81688-100AS61KA 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 81688-100AS61KA reliable?
The price and inventory of 81688-100AS61KA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 81688-100AS61KA is usually 5 days.
3.What payment methods are accepted for 81688-100AS61KA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 81688-100AS61KA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 81688-100AS61KA?
81688-100AS61KA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 81688-100AS61KA 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 81688-100AS61KA?
For technical support, including 81688-100AS61KA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 81688-100AS61KA requirements.
6.How does Aetrix verify that 81688-100AS61KA is sourced from the original manufacturer or authorized distributors?
All 81688-100AS61KA 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 81688-100AS61KA meets industry standards.
7.What is the process for return or replacement of 81688-100AS61KA?
All 81688-100AS61KA units undergo pre-shipment inspection (PSI). If there is an issue with 81688-100AS61KA, 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 81688-100AS61KA part is unused and in its original packaging.
Return procedure for 81688-100AS61KA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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