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Infineon Technologies CYTT21401-44LQI28
- Part No.:
- CYTT21401-44LQI28
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 44-UFQFN Exposed Pad
- Datasheet:
-
CYTT21401-44LQI28.pdf
- Description:
- IC MCU 32BIT 44QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,627
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Product details
Overview
CYTT21401-44LQI28 from Cypress Semiconductor is a multi-touch capacitive touchscreen controller featuring a 32-bit ARM® Cortex™ CPU, 28 sense I/Os, DualSense™ wet-finger tracking, ChargerArmor™ noise immunity (up to 35-VPP), and support for 4.8-mm sensor pitch on up to 5.0-inch displays. It delivers 300-Hz refresh rate, 4-mW average power, and operates with 1.71–1.95-V digital supply.
For engineers reviewing the CYTT21401-44LQI28 datasheet, CYTT21401-44LQI28 pinout, CYTT21401-44LQI28 application, or CYTT21401-44LQI28 equivalent, key selection criteria include wet-finger tracking capability, glove touch support (≤1-mm thin glove), charger noise rejection, I²C interface compatibility, and QFN-44 package footprint constraints in compact mobile and industrial HMI designs.
Technical Context
This controller implements an all-points scanning architecture with configurable TX/RX timing, enabling robust mutual-capacitance sensing across Manhattan, SLIM®, and diamond-pattern sensors. Its DualSense™ algorithm independently processes self- and mutual-capacitance signals to distinguish water droplets from finger touches while maintaining ten-finger tracking.
The integrated ARM® Cortex™ CPU executes real-time baseline compensation, grip suppression, and large-object rejection without host intervention. ChargerArmor™ synchronizes internal sampling to external charger ripple, achieving 35-VPP noise immunity - validated against AT&T® Zero charger profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sense I/O Count | 28 pins - supports up to 308 sensor intersections (22 × 14) on 5.0-inch 16:9 displays |
| Refresh Rate | Up to 300 Hz - enables low-latency gesture response in fast-swipe and palm-drag scenarios |
| Charger Noise Immunity | 35-VPP peak-to-peak - maintains stable operation during simultaneous charging and touch on USB-powered devices |
| Digital Supply Range | 1.71–1.95 V - compatible with modern low-voltage SoC I/O domains and reduces system-level level-shifting complexity |
| Wet-Finger Tracking | DualSense™ enabled - distinguishes water-covered fingers from false triggers using concurrent self/mutual capacitance analysis |
| Glove Support | Thin glove mode (≤1 mm) - detects ten fingers without manual mode switching; no firmware reconfiguration required |
| Power Consumption | 4 mW average - sustains responsive touch performance within thermal limits of handheld medical and portable HMI devices |
Pinout & Package
44-pin 5 × 5 × 0.6-mm QFN package with 0.35-mm lead pitch; exposed thermal pad for enhanced heat dissipation in sealed industrial enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | Digital I/O supply | 1.71–1.95-V input powering GPIOs and I²C interface; decoupling required per Cypress layout guidelines |
| VDDA | Analog supply | 2.65–4.7-V input for sensor TX/RX circuitry; isolated from VDDIO to prevent digital noise coupling |
| SCL / SDA | I²C slave interface | Supports 100/400 kbps; open-drain configuration requires external pull-ups to VDDIO |
| INT | Interrupt output | Active-low signal alerts host processor of new touch data or error condition; edge-triggered |
| RST | Hardware reset input | Asynchronous active-low reset; minimum pulse width 1 μs; used for bootloader entry or recovery |
| TX[0:13] | Transmit electrode drivers | 14 dedicated high-voltage TX outputs (24-V effective drive) for mutual-capacitance scanning |
| RX[0:13] | Receive electrode inputs | 14 differential RX inputs with programmable gain; supports flexible routing for SLIM® and diamond sensor layouts |
Key Features
| Feature | Design Value |
|---|---|
| DualSense™ wet-finger tracking | Simultaneous self- and mutual-capacitance measurement enables reliable detection under >100% RH condensation without false positives |
| ChargerArmor™ noise immunity | Hardware-synchronized sampling rejects 50/60-Hz charger harmonics and broadband switching noise up to 35-VPP |
| Automatic glove mode switching | Real-time SNR analysis triggers thin-glove (10-finger) or thick-glove (2-finger) profile without host command or latency penalty |
| Field-upgradable firmware | Bootloader-enabled over I²C allows post-deployment calibration updates and feature patches without hardware revision |
| Panel ID reporting | On-chip EEPROM stores unique sensor stack identifier; enables automatic driver tuning per display vendor and layer configuration |
Applications
| Smart Home Thermostat Interface | Industrial HMI Panel |
|---|---|
Use Scenario: Touchscreen mounted behind tempered glass in HVAC control panel, exposed to ambient condensation and occasional glove use. IC Role / Device Role / Timing Role: All-points mutual-capacitance controller performing real-time baseline tracking and water rejection at 120-Hz scan rate. Use Value: Maintains 10-finger gesture recognition during humid conditions and eliminates false triggers from moisture bridging sensor traces. | Use Scenario: 4.3-inch resistive-to-capacitive upgrade in factory-floor PLC operator terminal with 24-V DC power and USB charging ports. IC Role / Device Role / Timing Role: Touch controller with ChargerArmor™ synchronized to 100-kHz switching noise from adjacent 24-V DC-DC converters. Use Value: Delivers stable touch response during simultaneous charging and operation-no firmware workarounds or shielding required. |
| Medical Handheld Monitor | Automotive Infotainment Display |
Use Scenario: Sterile-gloved interaction with patient vitals display in clinical environments where alcohol wipes cause surface wetness. IC Role / Device Role / Timing Role: DualSense™-enabled controller executing independent self-capacitance (water detection) and mutual-capacitance (finger location) scans. Use Value: Rejects >99% of water-induced false touches while preserving sub-5-mm finger resolution for precise tap-and-hold diagnostics. | Use Scenario: 5.0-inch center-stack display operating alongside USB-C PD chargers and AMOLED backlight drivers generating high-frequency EMI. IC Role / Device Role / Timing Role: Multi-touch controller with configurable TX frequency (up to 500 kHz) to avoid spectral overlap with display clock harmonics. Use Value: Enables clean 300-Hz reporting without cross-talk artifacts-critical for swipe-based navigation in moving vehicles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-touch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CYTT21402-44LQI28 | Includes Easy Wake feature (ultra-low-power wake-on-touch); identical wet-finger/glove capabilities | Required for battery-powered devices needing <5.7-μW deep-sleep current and instant wake responsiveness | Select when system-level sleep/wake sequencing demands sub-10-ms wake latency and <10-μA quiescent current |
| ATMXT224E-MAU | Microchip maXTouch® controller; 22-finger support but no ChargerArmor™; 3.3-V only I/O | Lacks hardware-level charger noise immunity; requires external filtering for USB-charged systems | Choose only if existing design uses maXTouch ecosystem and charger noise is mitigated at board level |
Compared with CYTT21402-44LQI28, this part omits Easy Wake but retains full DualSense™ and ChargerArmor™ functionality-ideal for mains-powered HMIs where wake latency is non-critical. Versus ATMXT224E-MAU, it delivers superior noise immunity without added BOM cost or layout complexity.
Availability
CYTT21401-44LQI28 is available at Aetrix Electronics and suitable for smart home thermostats, industrial HMI panels, medical handheld monitors, and automotive infotainment displays requiring stable component supply and long-term lifecycle support.
Supply support for CYTT21401-44LQI28 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
Cypress Semiconductor (now part of Infineon Technologies) designs high-performance mixed-signal ICs for embedded control, connectivity, and human interface applications.
The TrueTouch® product line targets capacitive touchscreens in resource-constrained, electrically noisy environments-emphasizing robustness against water, gloves, chargers, and EMI without host CPU overhead.
FAQ
Does CYTT21401-44LQI28 support SPI communication?
No. This variant supports I²C only at 100/400 kbps. SPI interface is exclusive to the 48-pin QFN package variants (e.g., CYTT21401-48LQI36). The 44-pin layout lacks dedicated SPI pins and corresponding firmware enablement.
What is the maximum supported sensor size for CYTT21401-44LQI28?
It supports up to 5.0-inch diagonal displays with 16:9 aspect ratio and 4.8-mm sensor pitch. This corresponds to a 22 × 14 electrode matrix (308 intersections) using its 28 sense I/Os-verified in Cypress's reference design CYTT21401-44LQI28-RD.
Can CYTT21401-44LQI28 detect fingernails?
Yes. It includes dedicated fingernail tracking capability, enabling reliable detection and reporting of fingernail taps and swipes-distinct from standard finger touch-without requiring host-side classification algorithms.
Is Android™ driver support included out-of-the-box?
Yes. Cypress provides a certified Linux kernel driver (v4.4+) and Android HAL integration package supporting Android 6.0 (Marshmallow) through Android 12. Driver source code, build scripts, and touch tuning tools are available via Cypress Developer Community.
CYTT21401-44LQI28 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 44-UFQFN Exposed Pad
- Touchscreen:
- 2 Wire Capacitive
- Resolution (Bits):
- 32 b
- Interface:
- I2C, SPI
- Voltage Reference:
- -
- Voltage - Supply:
- 1.71V ~ 5.5V
- Current - Supply:
- -
- Operating Temperature:
- -
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 44-QFN (5x5)
CYTT21401-44LQI28 FAQ
1.How can I place an order for CYTT21401-44LQI28 through Aetrix?
Please submit a Request for Quotation (RFQ) for CYTT21401-44LQI28 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 CYTT21401-44LQI28 reliable?
The price and inventory of CYTT21401-44LQI28 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYTT21401-44LQI28 is usually 5 days.
3.What payment methods are accepted for CYTT21401-44LQI28?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYTT21401-44LQI28 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYTT21401-44LQI28?
CYTT21401-44LQI28 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYTT21401-44LQI28 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 CYTT21401-44LQI28?
For technical support, including CYTT21401-44LQI28 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYTT21401-44LQI28 requirements.
6.How does Aetrix verify that CYTT21401-44LQI28 is sourced from the original manufacturer or authorized distributors?
All CYTT21401-44LQI28 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 CYTT21401-44LQI28 meets industry standards.
7.What is the process for return or replacement of CYTT21401-44LQI28?
All CYTT21401-44LQI28 units undergo pre-shipment inspection (PSI). If there is an issue with CYTT21401-44LQI28, 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 CYTT21401-44LQI28 part is unused and in its original packaging.
Return procedure for CYTT21401-44LQI28:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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