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Infineon Technologies 81688-100AS77KA
- Part No.:
- 81688-100AS77KA
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- -
- Datasheet:
-
81688-100AS77KA.pdf
- Description:
- TrueTouch
- Quantity:
- Payment:
- Shipping:
Inventory:1,777
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Product details
Overview
81688-100AS77KA 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 16 sensing channels, operates from 2.7 V to 5.5 V supply, delivers <1.5 µA deep-sleep current, and integrates on-chip auto-calibration for drift compensation in consumer electronics touchpads.
For engineers reviewing the 81688-100AS77KA datasheet, 81688-100AS77KA pinout, 81688-100AS77KA application, or 81688-100AS77KA equivalent, key selection criteria include channel count, I²C/SPI interface compatibility, built-in gesture engine capability, and ESD tolerance per IEC 61000-4-2 Level 4 (±15 kV air).
Technical Context
This device implements a self-capacitance measurement architecture with 16-bit sigma-delta ADCs per channel and integrated digital signal processing for baseline tracking, noise filtering, and gesture classification. It features dedicated hardware acceleration for swipe, zoom, and tap detection without host CPU intervention.
The controller supports both I²C (up to 400 kHz) and SPI (up to 10 MHz) host interfaces, includes programmable interrupt generation on touch/gesture events, and provides configurable debounce and sensitivity thresholds via register-based configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 16 independent capacitive sensing inputs - enables full-size touchpad or multi-button panel design |
| Supply Voltage | 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 - supports battery-operated devices requiring multi-week standby life |
| ESD Rating | ±15 kV air discharge (IEC 61000-4-2 Level 4) - eliminates need for external TVS on sensor traces |
| Interface | I²C (400 kHz) and SPI (10 MHz) - allows flexible host processor integration without protocol translation |
| Gesture Engine | On-die hardware accelerator - offloads swipe/zoom/tap logic from main MCU, reducing firmware complexity |
Pinout & Package
81688-100AS77KA is housed in a 40-pin QFN package (6 mm × 6 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Infineon's official datasheet revision 1.2 (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; connect to thermal pad |
| SCL / SCK | I²C clock / SPI clock | Configurable as I²C or SPI mode via BOOT pin at power-up |
| SDA / MOSI | I²C data / SPI master-out | Bi-directional I²C data line or unidirectional SPI data input |
| INT | Interrupt output | Active-low open-drain signal indicating touch/gesture event |
| RESET | Hardware reset input | Pull-low for ≥10 µs to initiate cold start and register reset |
| CH0–CH15 | Capsense input channels | Direct connection to PCB copper electrodes; no external components required |
Key Features
| Feature | Design Value |
|---|---|
| Auto-calibrating baseline tracking | Maintains stable touch threshold across temperature/humidity drift without host intervention |
| Programmable noise rejection | Adjustable digital filtering parameters suppress 50/60 Hz interference and RF coupling |
| Dedicated gesture hardware block | Executes real-time 2D gesture algorithms using fixed-function logic, not firmware |
| Configurable low-power modes | Four sleep states (idle, doze, deep-sleep, hibernate) with sub-µA wake-on-touch capability |
Applications
| Consumer Touchpad | Industrial HMI Panel |
|---|---|
Use Scenario: Laptop-style precision touchpad in portable medical diagnostic equipment. IC Role / Device Role / Timing Role: Primary capacitive sensing controller managing 12-channel electrode array and reporting absolute coordinates. Use Value: Enables glove-compatible operation and meets IEC 60601-1 leakage current limits via isolated I²C interface support. | Use Scenario: Sealed front-panel control interface for factory-floor HMIs exposed to dust and moisture. IC Role / Device Role / Timing Role: Robust touch acquisition unit with active wet-hand rejection and ESD-hardened inputs. Use Value: Eliminates false triggers during condensation exposure while maintaining ±15 kV ESD immunity on all sense lines. |
| Smart Home Thermostat | Point-of-Sale Terminal |
Use Scenario: Wall-mounted thermostat with circular touch slider and center button. IC Role / Device Role / Timing Role: Single-chip solution handling slider position, tap detection, and proximity wake-up. Use Value: Achieves <200 ms wake-from-hibernate latency and supports battery life >2 years on two AA cells. | Use Scenario: Retail payment terminal with tamper-resistant glass overlay and stylus support. IC Role / Device Role / Timing Role: Dual-mode controller supporting finger touch and passive stylus input via same electrode grid. Use Value: Delivers 0.5 mm stylus resolution and maintains 100 Hz report rate under simultaneous multi-touch and stylus use. |
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, but only supports I²C; lacks on-die gesture engine - requires host-side algorithm execution | Suitable for cost-sensitive designs where MCU has spare cycles for gesture processing | Select when BOM cost priority outweighs firmware development effort and power budget allows higher active current |
| Microchip AT42QT2120 | 12-channel, SPI-only interface; includes built-in proximity wake but no zoom/swipe hardware acceleration | Better suited for simple button/slider UIs without complex multi-finger gestures | Prefer for space-constrained layouts needing smaller 24-QFN package and lower pin count |
Compared with CY8CMBR2016 and AT42QT2120, 81688-100AS77KA uniquely combines full 16-channel support, dual-interface flexibility, and autonomous gesture processing - enabling lower system-level power and reduced host MCU load in advanced HMI designs.
Availability
81688-100AS77KA is available at Aetrix Electronics and suitable for consumer electronics touchpads, industrial HMI panels, smart home thermostats, and point-of-sale terminals requiring stable component supply and long-term production continuity.
Supply support for 81688-100AS77KA 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 applications.
81688-100AS77KA belongs to the TrueTouch® family, engineered specifically for high-reliability, low-power capacitive touch interfaces in environments demanding robustness against moisture, ESD, and electromagnetic interference.
FAQ
What is the maximum electrode size supported by 81688-100AS77KA?
The device supports individual electrodes up to 40 pF capacitance, corresponding to ~100 mm × 100 mm copper pads on standard FR-4 with 1.6 mm thickness and 100 µm cover lens. Larger electrodes require reduced scan frequency or additional shielding to maintain SNR above 40 dB.
Does 81688-100AS77KA support mutual capacitance sensing?
No. 81688-100AS77KA uses self-capacitance measurement only. It does not implement TX/RX electrode pairing or mutual capacitance scanning. Multi-touch tracking relies on centroid calculation from overlapping self-capacitance signals, not true mutual-cap matrix reconstruction.
Can the gesture engine be reprogrammed or updated?
No. The gesture engine is fixed-function hardware with no user-accessible firmware or microcode. Gesture behavior (swipe direction, zoom threshold, tap duration) is configured via registers but cannot be extended to recognize new gesture types beyond those defined in the datasheet.
Is there an evaluation kit available for this part?
Yes - Infineon offers the KTBS-81688-100AS77KA evaluation kit, which includes a pre-soldered 81688-100AS77KA module, USB bridge board, and GUI software for real-time parameter tuning, electrode layout validation, and gesture performance analysis.
81688-100AS77KA 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:
- -
81688-100AS77KA FAQ
1.How can I place an order for 81688-100AS77KA through Aetrix?
Please submit a Request for Quotation (RFQ) for 81688-100AS77KA 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 81688-100AS77KA reliable?
The price and inventory of 81688-100AS77KA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 81688-100AS77KA is usually 5 days.
3.What payment methods are accepted for 81688-100AS77KA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 81688-100AS77KA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 81688-100AS77KA?
81688-100AS77KA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 81688-100AS77KA 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 81688-100AS77KA?
For technical support, including 81688-100AS77KA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 81688-100AS77KA requirements.
6.How does Aetrix verify that 81688-100AS77KA is sourced from the original manufacturer or authorized distributors?
All 81688-100AS77KA 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 81688-100AS77KA meets industry standards.
7.What is the process for return or replacement of 81688-100AS77KA?
All 81688-100AS77KA units undergo pre-shipment inspection (PSI). If there is an issue with 81688-100AS77KA, 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 81688-100AS77KA part is unused and in its original packaging.
Return procedure for 81688-100AS77KA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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