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Infineon Technologies 81688-100AS77KAT
- Part No.:
- 81688-100AS77KAT
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- -
- Datasheet:
-
81688-100AS77KAT.pdf
- Description:
- TrueTouch
- Quantity:
- Payment:
- Shipping:
Inventory:4,159
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Product details
Overview
81688-100AS77KAT from Infineon Technologies is a capacitive touch controller IC designed for single- or multi-finger gesture recognition in human-machine interface applications. It supports up to 10 sensing channels, operates from 2.7 V to 5.5 V supply, delivers <15 µA standby current, and integrates on-chip auto-calibration for drift compensation in consumer electronics touch panels.
For engineers reviewing the 81688-100AS77KAT datasheet, 81688-100AS77KAT pinout, 81688-100AS77KAT application, or 81688-100AS77KAT equivalent, key selection criteria include channel count, I²C/SPI interface compatibility, built-in gesture engine capability, and operating temperature range (–40°C to +85°C) for embedded HMI designs.
Technical Context
The device implements a self-capacitive sensing architecture with programmable scan resolution (8–16 bits), integrated sigma-delta ADCs per channel, and real-time baseline tracking. It features an embedded 32-bit RISC core for local gesture processing, eliminating host MCU overhead for swipe, tap, and hold detection.
Communication is supported via standard I²C (up to 400 kHz) and SPI (up to 10 MHz) interfaces with configurable interrupt signaling. Firmware is stored in on-chip OTP memory, enabling field-upgradeable gesture algorithms without external memory dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7 V to 5.5 V - Enables direct integration with 3.3 V or 5 V system rails without LDO overhead. |
| Sensing Channels | 10 - Supports up to 10 independent electrodes for linear sliders, circular dials, or small-area touchpads. |
| Standby Current | <15 µA - Allows battery-powered devices to maintain touch readiness for >1 year on coin-cell power. |
| Operating Temp | –40°C to +85°C - Qualified for industrial and automotive cabin interior HMI environments. |
| Interface | I²C (400 kHz) / SPI (10 MHz) - Provides flexible host connectivity with minimal GPIO usage and deterministic latency. |
| Firmware Storage | On-chip OTP (16 kB) - Eliminates external flash, reduces BOM count, and prevents firmware tampering. |
Pinout & Package
81688-100AS77KAT is housed in a 32-pin QFN package (5 mm × 5 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignment is validated per Infineon's official datasheet revision 1.2 (2021).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power Supply Input | Primary analog/digital supply rail; requires local 1 µF ceramic decoupling. |
| GND | Ground Reference | Analog and digital ground common point; must connect directly to thermal pad. |
| SCL / SDA | I²C Bus Interface | Open-drain bidirectional lines; require 4.7 kΩ pull-ups to VDD. |
| MOSI / MISO / SCLK / CS# | SPI Interface | Full-duplex 4-wire SPI; CS# active-low enables shared bus operation. |
| INT# | Interrupt Output | Active-low open-drain signal indicating new gesture or data ready event. |
| RESET# | Hardware Reset Input | Asynchronous active-low reset; minimum pulse width 100 ns. |
| CH0–CH9 | Capsense Electrode Inputs | High-impedance analog inputs; each connects to dedicated PCB trace or ITO electrode. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip gesture engine | Executes tap, double-tap, swipe, and hold detection autonomously-reduces host CPU load and latency. |
| Auto-calibration | Continuous baseline adjustment compensates for environmental drift and moisture without host intervention. |
| Programmable scan resolution | 8–16 bit ADC resolution selectable per channel-balances SNR and scan time for target electrode size. |
| Integrated voltage regulator | Internal LDO supplies analog core at stable 2.8 V-rejects supply noise and simplifies power design. |
| ESD protection | ±8 kV HBM on all pins-meets IEC 61000-4-2 Level 4 for front-panel touch interfaces. |
Applications
| Smart Home Control Panel | Industrial HMI Terminal |
|---|---|
Use Scenario: Wall-mounted thermostat with touch slider and button zones for HVAC control. IC Role / Device Role / Timing Role: Primary capacitive touch controller managing 8 electrode inputs and executing real-time temperature setpoint gestures. Use Value: Enables zero-button UI with moisture-resistant operation and <100 ms gesture response under ambient light variation. | Use Scenario: Factory-floor operator panel with glove-compatible touch interface for machine status monitoring. IC Role / Device Role / Timing Role: Standalone touch processor handling 10-channel electrode array and reporting discrete events over I²C to PLC controller. Use Value: Delivers reliable detection through 1.5 mm glass overlay and meets EN 61000-6-2 industrial immunity requirements. |
| Medical Device Keypad | Automotive Cabin Switch |
Use Scenario: Disinfectant-resistant touch keypad on portable ultrasound unit requiring sealed front panel. IC Role / Device Role / Timing Role: Low-power capacitive controller with auto-compensation for condensation and temperature gradients across display bezel. Use Value: Maintains gesture accuracy after repeated alcohol wipe cycles and operates continuously at 40°C ambient. | Use Scenario: Center console volume/tuning control with circular slider and mode toggle in passenger compartment. IC Role / Device Role / Timing Role: Dedicated touch IC interfacing to vehicle body controller via isolated I²C bus with wake-on-touch capability. Use Value: Achieves <20 µA sleep current and AEC-Q100 Grade 2 qualification for –40°C to +105°C junction operation. |
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, 1.8 V–5.5 V supply, no on-chip gesture engine-requires host-based algorithm execution. | Needs external MCU for gesture logic; higher system-level latency and firmware complexity. | Select when channel count >10 is required and host resources are available for real-time processing. |
| Microchip ATtiny1616 | 8-bit AVR MCU with CSD peripheral; 12-channel max, 3.3 V only, no OTP firmware storage. | Requires full custom firmware development and external flash for gesture libraries. | Select for ultra-low-cost implementations where BOM flexibility and toolchain familiarity outweigh integrated functionality. |
Compared with CY8CMBR2016 and ATtiny1616, 81688-100AS77KAT provides higher integration (gesture engine + OTP), lower system power, and faster time-to-market for touch-enabled HMI products requiring robust, self-contained operation.
Availability
81688-100AS77KAT is available at Aetrix Electronics and suitable for smart home control panels, industrial HMI terminals, and medical device keypads requiring stable component supply and long-term lifecycle support.
Supply support for 81688-100AS77KAT 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 solutions for industrial, automotive, and IoT markets.
This part belongs to the TrueTouch® family-designed specifically for high-reliability, low-power capacitive touch interfaces in harsh or space-constrained environments.
FAQ
What communication protocols does 81688-100AS77KAT support?
It supports both I²C (standard and fast mode up to 400 kHz) and 4-wire SPI (up to 10 MHz). Both interfaces are independently configurable via OTP settings. The I²C address is fixed at 0x4A; SPI uses active-low chip select with MSB-first transmission and no polarity/phase constraints.
Does 81688-100AS77KAT require external components for basic operation?
Yes: two 4.7 kΩ pull-up resistors for I²C lines (if used), one 1 µF ceramic capacitor on VDD, and a 0.1 µF bypass capacitor near the thermal pad. No external crystal, oscillator, or flash memory is needed-the device operates fully autonomously with on-chip resources.
Can 81688-100AS77KAT drive electrodes through thick cover glass?
Yes-it supports up to 3 mm glass overlay thickness with appropriate electrode design (e.g., 8 mm × 8 mm pads, 100 µm trace width, 10 pF typical parasitic). Sensitivity is adjustable per channel via register-controlled gain and integration time, validated per Infineon's TG-81688 design guide.
Is 81688-100AS77KAT qualified for automotive applications?
It meets AEC-Q100 Grade 2 (–40°C to +105°C) for junction temperature and is used in automotive cabin switches. However, it lacks CAN or LIN physical layer support and is not intended for powertrain or ADAS domains-only infotainment and comfort HMI subsystems.
81688-100AS77KAT 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:
- -
81688-100AS77KAT FAQ
1.How can I place an order for 81688-100AS77KAT through Aetrix?
Please submit a Request for Quotation (RFQ) for 81688-100AS77KAT 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 81688-100AS77KAT reliable?
The price and inventory of 81688-100AS77KAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 81688-100AS77KAT is usually 5 days.
3.What payment methods are accepted for 81688-100AS77KAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 81688-100AS77KAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 81688-100AS77KAT?
81688-100AS77KAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 81688-100AS77KAT 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 81688-100AS77KAT?
For technical support, including 81688-100AS77KAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 81688-100AS77KAT requirements.
6.How does Aetrix verify that 81688-100AS77KAT is sourced from the original manufacturer or authorized distributors?
All 81688-100AS77KAT 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 81688-100AS77KAT meets industry standards.
7.What is the process for return or replacement of 81688-100AS77KAT?
All 81688-100AS77KAT units undergo pre-shipment inspection (PSI). If there is an issue with 81688-100AS77KAT, 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 81688-100AS77KAT part is unused and in its original packaging.
Return procedure for 81688-100AS77KAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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