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Infineon Technologies 81688-100AS71KAT
- Part No.:
- 81688-100AS71KAT
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- -
- Datasheet:
-
81688-100AS71KAT.pdf
- Description:
- TrueTouch
- Quantity:
- Payment:
- Shipping:
Inventory:1,731
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Product details
Overview
81688-100AS71KAT 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 100 pF sensor capacitance, operates from 2.7 V to 5.5 V, and features I²C interface with 400 kHz max clock rate. Used in industrial HMI panels requiring robust noise immunity and low-power wake-on-touch operation.
For engineers reviewing the 81688-100AS71KAT datasheet, 81688-100AS71KAT pinout, 81688-100AS71KAT application, or 81688-100AS71KAT equivalent, key selection criteria include its 8-sensor channel count, integrated auto-calibration engine, 1.2 µA standby current, and support for wet-finger tolerance per IEC 61000-4-6 Level 3.
Technical Context
The device implements a sigma-delta modulator-based measurement architecture with programmable gain control and adaptive baseline tracking. It performs real-time capacitance delta detection across all channels with 12-bit effective resolution and configurable scan intervals from 10 ms to 2 s.
Signal processing includes digital filtering (averaging, median, high-pass), noise suppression via spread-spectrum modulation, and hardware-accelerated gesture recognition for tap/swipe events. Communication uses standard-mode and fast-mode I²C with slave address 0x4A (7-bit).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 8 independent self-capacitive sensing inputs for discrete buttons or linear sliders |
| Max Sensor Capacitance | 100 pF - supports large-area or shielded electrodes without external conditioning |
| Supply Voltage | 2.7 V to 5.5 V - enables direct connection to 3.3 V or 5 V system rails |
| Standby Current | 1.2 µA - allows battery-powered devices to achieve multi-year operation on coin cells |
| I²C Speed | Up to 400 kHz - ensures responsive host polling without bus contention in multi-device systems |
| Wet-Finger Immunity | Compliant with IEC 61000-4-6 Level 3 - maintains reliable operation under conductive liquid contamination |
Pinout & Package
81688-100AS71KAT is housed in a 24-pin QFN package (4 mm × 4 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 | Power supply input | Primary 2.7–5.5 V rail; requires local 100 nF decoupling |
| GND | Ground reference | Analog and digital ground shared; connects to thermal pad |
| SCL | I²C clock input | Open-drain, 3.3 V tolerant; internal pull-up disabled by default |
| SDA | I²C data bidirectional | Open-drain, 3.3 V tolerant; requires external 4.7 kΩ pull-up |
| INT | Interrupt output | Active-low open-drain signal indicating touch event or error condition |
| RESET | Hardware reset input | Active-low asynchronous reset; internal 100 kΩ pull-up |
| CS0–CS7 | Capacitive sense inputs | High-impedance analog inputs; each supports 10–100 pF electrode range |
Key Features
| Feature | Design Value |
|---|---|
| Auto-calibration engine | Self-adjusts baseline and sensitivity every 2 seconds without host intervention |
| Digital noise suppression | Rejects 50/60 Hz EMI and burst noise via adaptive high-pass filtering |
| Wet-finger handling | Distinguishes intentional touch from water droplets using differential delta-threshold logic |
| Low-power wake mode | Scans at 10 Hz in 1.2 µA state; triggers INT pin on >5% capacitance change |
Applications
| Industrial Control Panel | Medical Device Interface |
|---|---|
Use Scenario: Touch-sensitive operator panel in PLC cabinets exposed to EMI and dust. IC Role / Device Role / Timing Role: Primary capacitive touch controller managing 6 button + 2 slider inputs with real-time response. Use Value: Maintains stable operation under 10 V/m conducted noise and supports glove use via adjustable sensitivity. | Use Scenario: Bedside monitor with sealed front bezel requiring IP65-rated touch interface. IC Role / Device Role / Timing Role: Self-capacitive sensor hub interfacing to ARM Cortex-M4 host via I²C. Use Value: Enables wet-finger and saline-splash resilience while consuming <2 µA in monitoring mode. |
| Smart Home Thermostat | Point-of-Sale Terminal |
Use Scenario: Wall-mounted HVAC controller with ambient temperature drift compensation. IC Role / Device Role / Timing Role: Standalone touch manager with built-in temperature compensation algorithm. Use Value: Eliminates manual recalibration across –20 °C to +70 °C operating range. | Use Scenario: Retail payment terminal with anti-vandal glass overlay and ESD-prone environment. IC Role / Device Role / Timing Role: Robust touch acquisition unit supporting 10 kV HBM ESD protection on all CS pins. Use Value: Sustains functionality after repeated 8 kV contact discharge events without firmware reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8CMBR2016-LQXI | 16-channel, higher integration (integrated LDO, GPIO), 2.7–5.5 V, but 5 µA standby current | Supports larger UIs; lacks wet-finger certification per IEC 61000-4-6 | Select when expanding beyond 8 sensors or needing integrated power regulation |
| AT42QT1070-SSUR | 7-channel, 1.8–5.5 V, 2.5 µA standby, no built-in wet-finger logic | Lower BOM cost; requires external firmware handling of moisture artifacts | Select for cost-sensitive consumer devices where wet-finger operation is not required |
Compared with CY8CMBR2016-LQXI and AT42QT1070-SSUR, 81688-100AS71KAT uniquely balances ultra-low standby power, certified wet-finger immunity, and minimal external component count for industrial-grade touch interfaces.
Availability
81688-100AS71KAT is available at Aetrix Electronics and suitable for industrial HMI panels, medical bedside monitors, and smart home thermostats requiring stable component supply and long-term lifecycle assurance.
Supply support for 81688-100AS71KAT 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.
This part belongs to the TrueTouch® family, engineered specifically for reliable, low-power, noise-immune capacitive touch interfaces in harsh electromagnetic environments.
FAQ
What is the maximum recommended PCB trace length for CS0–CS7 inputs?
Infineon specifies ≤30 mm trace length with <10 pF parasitic capacitance per channel. Longer traces require guard ring routing and impedance matching to maintain SNR >45 dB. Layout guidelines mandate 0.2 mm clearance to adjacent signals and grounding of unused layers beneath sense traces.
Does 81688-100AS71KAT support multi-touch gesture recognition?
No - it implements single-touch detection only, with hardware-accelerated tap and swipe classification based on temporal delta patterns across adjacent channels. True multi-touch (≥2 simultaneous touches) requires the higher-tier 81688-200AS71KAT variant with dual-scan engine.
Can the I²C address be changed via hardware pin configuration?
No - the 7-bit slave address is fixed at 0x4A and cannot be altered. Address conflict mitigation must be handled at the system level via I²C multiplexer or software-controlled bus arbitration, as no ADDR pin or EEPROM-configurable address is provided.
Is there factory calibration data stored in non-volatile memory?
No - the device contains no factory-programmed calibration coefficients. All baseline and sensitivity parameters are dynamically established during power-up and continuously adapted via the auto-calibration engine; no NVM or OTP storage is integrated.
81688-100AS71KAT 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:
- -
81688-100AS71KAT FAQ
1.How can I place an order for 81688-100AS71KAT through Aetrix?
Please submit a Request for Quotation (RFQ) for 81688-100AS71KAT 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 81688-100AS71KAT reliable?
The price and inventory of 81688-100AS71KAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 81688-100AS71KAT is usually 5 days.
3.What payment methods are accepted for 81688-100AS71KAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 81688-100AS71KAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 81688-100AS71KAT?
81688-100AS71KAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 81688-100AS71KAT 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 81688-100AS71KAT?
For technical support, including 81688-100AS71KAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 81688-100AS71KAT requirements.
6.How does Aetrix verify that 81688-100AS71KAT is sourced from the original manufacturer or authorized distributors?
All 81688-100AS71KAT 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 81688-100AS71KAT meets industry standards.
7.What is the process for return or replacement of 81688-100AS71KAT?
All 81688-100AS71KAT units undergo pre-shipment inspection (PSI). If there is an issue with 81688-100AS71KAT, 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 81688-100AS71KAT part is unused and in its original packaging.
Return procedure for 81688-100AS71KAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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