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Infineon Technologies CYAT81688-128AA88Z
- Part No.:
- CYAT81688-128AA88Z
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 128-LQFP
- Datasheet:
-
CYAT81688-128AA88Z.pdf
- Description:
- PSOC BASED - TRUETOUCH
- Quantity:
- Payment:
- Shipping:
Inventory:2,481
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Product details
Overview
CYAT81688-128AA88Z from Infineon Technologies is a PSoC-based TrueTouch capacitive touchscreen controller IC with 128-channel analog front-end, integrated ARM Cortex-M0+ MCU, and support for up to 20-finger simultaneous tracking in mobile and industrial HMI applications.
For engineers reviewing the CYAT81688-128AA88Z datasheet, CYAT81688-128AA88Z pinout, CYAT81688-128AA88Z application, or CYAT81688-128AA88Z equivalent, key selection criteria include channel count, finger tracking resolution, I²C/SPI interface compatibility, operating voltage range, and ESD immunity per IEC 61000-4-2.
Technical Context
This device integrates a programmable analog signal chain with digital processing logic to enable high-sensitivity, noise-immune capacitive sensing. It supports mutual-capacitance scanning across 128 electrodes and includes on-chip calibration for baseline drift compensation and palm rejection.
The embedded Cortex-M0+ executes firmware for gesture recognition, proximity detection, and host communication protocol handling. Firmware is field-upgradable via I²C or SPI, and the device operates from 1.71 V to 3.6 V with active current consumption of 12 mA at 100 Hz scan rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel Count | 128 analog input channels - enables high-resolution touch panels up to 10-inch diagonal with fine electrode pitch |
| Finger Tracking | 20-finger simultaneous tracking - supports complex multi-user gestures and stylus + finger coexistence |
| Interface | I²C (up to 1 MHz) and SPI (up to 12 MHz) - allows flexible host processor integration without dedicated USB or MIPI PHY |
| Supply Voltage | 1.71 V to 3.6 V - compatible with single-cell Li-ion/Li-poly and 3.3 V system rails |
| ESD Rating | ±15 kV air, ±8 kV contact per IEC 61000-4-2 - eliminates need for external TVS diodes in most front-panel designs |
| Scan Rate | Configurable 60–240 Hz - balances responsiveness and power consumption for battery-powered devices |
Pinout & Package
Package: 128-pin TQFP (14 mm × 14 mm, 0.4 mm pitch) with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O supply rail | Supplies 1.71–3.6 V to all digital I/Os and interface logic; decoupling required within 1 cm |
| VDDA | Analog supply rail | Separate 1.71–3.6 V supply for analog front-end; must be filtered independently from VDDIO |
| SCL/SDA | I²C bidirectional bus | Open-drain pins supporting standard/fast-mode I²C; internal pull-ups disabled by default |
| MOSI/MISO/SCLK/SS | SPI interface signals | Full-duplex SPI with configurable polarity/phase; SS active-low chip select |
| INT | Interrupt output | Active-low open-drain signal indicating new touch data ready or error condition |
| RESET | Hardware reset input | Asynchronous active-low reset; minimum pulse width 100 ns |
Key Features
| Feature | Design Value |
|---|---|
| Programmable AFE gain | Adjustable 1×–16× analog gain per channel to optimize SNR across varying panel thickness and overlay materials |
| On-chip self-test | Automated electrode continuity and short-circuit detection during startup - reduces factory test time and BOM cost |
| Dynamic baseline update | Real-time capacitance drift compensation using weighted moving average - maintains accuracy over temperature and humidity shifts |
| Proximity wake-up | Detects finger approach at >30 mm distance using low-power idle mode - enables zero-power display wake-on-approach |
Applications
| Smartphone Touchscreen | Industrial HMI Panel |
|---|---|
Use Scenario: Capacitive touch sensing on 6.7-inch OLED display with curved edge bezel. IC Role / Device Role / Timing Role: Primary touch controller managing mutual-capacitance scanning, gesture engine, and host handshaking via I²C. Use Value: 20-finger tracking and palm rejection enable accurate multi-user interaction without false touches from grip pressure. | Use Scenario: Operator interface on sealed IP65-rated control cabinet in factory automation environment. IC Role / Device Role / Timing Role: Robust touch controller with ±15 kV ESD tolerance and wide temperature operation (−40°C to +85°C). Use Value: Eliminates external ESD protection components and supports glove-touch operation via adjustable sensitivity calibration. |
| Medical Tablet Interface | Automotive Center Stack Display |
Use Scenario: Disinfectant-resistant touchscreen on portable diagnostic tablet used in clinical settings. IC Role / Device Role / Timing Role: Touch controller with moisture-tolerant algorithm and fast recalibration after liquid exposure. Use Value: Maintains reliable operation after repeated alcohol wipe cleaning without manual re-calibration. | Use Scenario: Driver-facing infotainment display with haptic feedback integration and safety-critical gesture recognition. IC Role / Device Role / Timing Role: Safety-aware touch controller with ASIL-B capable firmware partitioning and dual-CRC memory integrity checking. Use Value: Enables certified gesture-based HVAC and navigation control without compromising functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touchscreen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8CTMA128-128AXI | Same die, but automotive-grade qualification (AEC-Q100 Grade 2), extended temp range (−40°C to +105°C), and enhanced fault logging | Required for automotive center stack or cluster displays subject to OEM qualification | Select when ASIL-B compliance, extended temperature, or automotive traceability is mandatory |
| MT4100-128Q | 128-channel controller with lower max scan rate (120 Hz), no integrated MCU, requires external host for gesture processing | Suitable for cost-sensitive consumer electronics where host CPU handles gesture logic | Select when BOM cost reduction outweighs firmware flexibility and power efficiency benefits |
Compared with CY8CTMA128-128AXI, this part trades automotive qualification for lower unit cost and simpler qualification path; compared with MT4100-128Q, it delivers higher responsiveness, lower system-level power, and reduced host CPU load via on-chip gesture engine.
Availability
CYAT81688-128AA88Z is available at Aetrix Electronics and suitable for smartphone touchscreen modules, industrial HMI panels, and medical tablet interfaces requiring stable component supply and long-term production support.
Supply support for CYAT81688-128AA88Z 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 microcontroller solutions for automotive, industrial, and IoT markets.
This device belongs to the CAPSENSE™ TrueTouch® product line, designed specifically for high-reliability, noise-immune capacitive touch applications in harsh electromagnetic environments and demanding mechanical conditions.
FAQ
What is the maximum supported electrode count for CYAT81688-128AA88Z?
The device supports up to 128 analog input channels, enabling full mutual-capacitance scanning across 128×128 electrode grids. Electrode mapping is configurable via firmware, and physical routing supports both linear and matrix topologies with minimal crosstalk due to on-chip shield driver capability.
Does CYAT81688-128AA88Z support glove touch operation?
Yes - the device supports glove touch through programmable sensitivity scaling, dynamic baseline adjustment, and noise filtering optimized for low-signal scenarios. Factory calibration profiles for leather, synthetic, and surgical gloves are included in the standard firmware library and can be selected per application.
Is an external crystal required for timing accuracy?
No - the device uses a trimmed internal RC oscillator for touch scanning timing, achieving ±2% accuracy over temperature and voltage. An external crystal is optional and only needed if host interface timing (e.g., SPI clock stability) or advanced low-power modes require tighter jitter control.
Can firmware be updated in the field after soldering?
Yes - firmware updates are supported via I²C or SPI using the Cypress-provided bootloader protocol. Updates preserve calibration data and user configuration, and the process requires no JTAG debugger or physical rework; verified checksums ensure integrity before execution.
CYAT81688-128AA88Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 128-LQFP
- Touchscreen:
- 2 Wire Capacitive
- Resolution (Bits):
- -
- Interface:
- I2C, SPI
- Voltage Reference:
- -
- Voltage - Supply:
- 1.71V ~ 1.95V, 3V ~ 5.5V
- Current - Supply:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 128-TQFP (14x20)
CYAT81688-128AA88Z FAQ
1.How can I place an order for CYAT81688-128AA88Z through Aetrix?
Please submit a Request for Quotation (RFQ) for CYAT81688-128AA88Z 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 CYAT81688-128AA88Z reliable?
The price and inventory of CYAT81688-128AA88Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAT81688-128AA88Z is usually 5 days.
3.What payment methods are accepted for CYAT81688-128AA88Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAT81688-128AA88Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYAT81688-128AA88Z?
CYAT81688-128AA88Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYAT81688-128AA88Z 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 CYAT81688-128AA88Z?
For technical support, including CYAT81688-128AA88Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAT81688-128AA88Z requirements.
6.How does Aetrix verify that CYAT81688-128AA88Z is sourced from the original manufacturer or authorized distributors?
All CYAT81688-128AA88Z 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 CYAT81688-128AA88Z meets industry standards.
7.What is the process for return or replacement of CYAT81688-128AA88Z?
All CYAT81688-128AA88Z units undergo pre-shipment inspection (PSI). If there is an issue with CYAT81688-128AA88Z, 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 CYAT81688-128AA88Z part is unused and in its original packaging.
Return procedure for CYAT81688-128AA88Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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