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Infineon Technologies CYTT21401-44LQI28T
- Part No.:
- CYTT21401-44LQI28T
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 44-UFQFN Exposed Pad
- Datasheet:
-
CYTT21401-44LQI28T.pdf
- Description:
- IC MCU 32BIT 44QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,179
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Product details
Overview
CYTT21401-44LQI28T 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 enables ten-finger reporting with 300-Hz refresh rate and operates from 1.71–1.95-V digital supply.
For engineers reviewing the CYTT21401-44LQI28T datasheet, CYTT21401-44LQI28T pinout, CYTT21401-44LQI28T application, or CYTT21401-44LQI28T equivalent, this controller delivers verified glove touch (≤1-mm thin), fingernail tracking, grip suppression, and field-upgradable firmware via bootloader-critical for industrial HMI and medical touchscreen design.
Technical Context
The CYTT21401-44LQI28T implements a register-configurable capacitive sensing architecture with dedicated hardware acceleration for mutual-capacitance scanning across 28 I/Os (22 TX × 14 RX = 308 nodes). Its DualSense™ engine independently processes self- and mutual-capacitance signals to distinguish water droplets from finger contact while maintaining 4-mm small-finger resolution.
ChargerArmor™ integrates adaptive frequency hopping and real-time baseline correction to suppress 50/60-Hz charger noise without external shielding; the analog front-end supports 24-V effective drive for SNR enhancement, and the I²C interface operates at 100/400 kbps with ACK polling for host synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sense I/O Count | 28 pins (22 TX + 14 RX) enabling 308-node mutual-capacitance scanning on compact displays |
| Max Refresh Rate | 300 Hz - supports responsive UI navigation and gesture recognition in handheld devices |
| Charger Noise Immunity | Up to 35-VPP - eliminates false touches during USB charging without hardware filtering |
| Digital Supply Range | 1.71–1.95 V - matches low-voltage SoC I/O domains and reduces system-level power conversion loss |
| Wet-Finger Tracking | DualSense™ algorithm - distinguishes water from finger via simultaneous self/mutual capacitance analysis |
| Glove Support | Thin glove (≤1 mm) for 10-finger operation; thick glove (≤5 mm) for 2-finger mode - auto-switched without host intervention |
| Power (Active) | 4 mW average - enables battery-powered portable HMIs with >1-week standby under typical usage |
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 enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | Digital I/O supply | 1.71–1.95-V rail powering GPIOs and I²C interface; decoupling required per CapSense layout guidelines |
| VDDA | Analog supply | 2.65–4.7-V rail for sensor driver and ADC; isolated from digital ground to minimize coupling noise |
| SCL / SDA | I²C slave interface | Open-drain bidirectional lines supporting 100/400 kbps; internal pull-ups disabled by default |
| INT | Interrupt output | Active-low signal indicating valid touch data ready; level-triggered for reliable host wake-up |
| RST | Hardware reset input | Asynchronous active-low reset; minimum pulse width 1 μs for full state machine initialization |
| TX[0:21] | Transmit electrode drivers | 22 high-voltage (24-V effective) outputs driving row electrodes; configurable scan order and drive strength |
| RX[0:13] | Receive electrode inputs | 14 low-noise differential inputs sampling column electrodes; integrated programmable gain amplifier (PGA) |
Key Features
| Feature | Design Value |
|---|---|
| DualSense™ wet-finger tracking | Simultaneous self- and mutual-capacitance measurement enables robust operation under condensation or rain without firmware recalibration |
| ChargerArmor™ noise immunity | Real-time adaptive frequency selection and baseline drift compensation eliminate false triggers from switching chargers up to 35-VPP |
| Automatic glove mode switching | Detects glove thickness via signal attenuation profile and switches between 10-finger (thin) and 2-finger (thick) modes autonomously |
| Fingernail and grip suppression | Capacitance gradient analysis rejects non-fingertip contact and palm rests while preserving intentional edge swipes |
| Field-upgradable firmware | Secure bootloader enables over-the-air (OTA) updates without requiring JTAG or physical rework of deployed units |
Applications
| Industrial HMI Panels | Medical Diagnostic Tablets |
|---|---|
Use Scenario: Touchscreen interface on sealed control panels in factory automation cabinets exposed to coolant mist and operator gloves. IC Role / Device Role / Timing Role: All-points mutual-capacitance controller performing real-time touch coordinate extraction and noise-adaptive baseline correction. Use Value: DualSense™ ensures reliable wet-finger operation; ChargerArmor™ prevents spurious interrupts during nearby motor drive activation. | Use Scenario: Portable ultrasound tablet used in clinical environments where users wear nitrile gloves and require sterile screen interaction. IC Role / Device Role / Timing Role: Low-latency touch processor delivering 300-Hz report rate with automatic thin/thick glove mode detection. Use Value: 10-finger thin-glove tracking enables pinch-to-zoom; large-object rejection avoids palm misregistration during handheld use. |
| Consumer Remote Controls | Home Appliance Control Panels |
Use Scenario: Capacitive touch remote with minimal bezel, operating near AC adapters and LED lighting with EMI exposure. IC Role / Device Role / Timing Role: Integrated touch controller with embedded ARM Cortex-M core executing proprietary gesture algorithms. Use Value: 4-mW active power extends coin-cell battery life; I²C interface simplifies integration with low-cost microcontrollers. | Use Scenario: Oven or washing machine control panel subjected to steam, splashes, and repeated cleaning with alcohol wipes. IC Role / Device Role / Timing Role: Robust capacitive sensing engine with water rejection and automatic baseline tracking across temperature shifts. Use Value: DualSense™ maintains accuracy during condensation; grip suppression prevents accidental activation when resting hand on panel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-touch capacitive controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CYTT21402-44LQI28T | Includes Easy Wake feature (ultra-low-power wake-on-touch); identical pinout and firmware compatibility | Required for battery-powered devices needing <5.7-μW deep-sleep current with instant wake capability | Select when system-level power budget mandates sub-6-μW sleep current and wake latency <100 ms |
| ATMXT224E-MAU | Atmel (Microchip) maXTouch® controller; 224-node max, 3.3-V I/O, no built-in ChargerArmor™ | Lacks native charger noise immunity; requires external filtering for USB-charged systems | Choose only if existing design uses Atmel toolchain and charger noise is absent or externally mitigated |
Compared with CYTT21402-44LQI28T, this part omits Easy Wake but retains identical wet-finger, glove, and noise-immunity features-ideal for mains-powered HMIs where wake latency is non-critical. Versus ATMXT224E-MAU, it delivers superior charger resilience without added BOM cost or layout complexity.
Availability
CYTT21401-44LQI28T is available at Aetrix Electronics and suitable for industrial HMI panels, medical diagnostic tablets, and home appliance control panels requiring stable component supply and long-term lifecycle assurance.
Supply support for CYTT21401-44LQI28T 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 systems, with expertise in capacitive sensing, USB connectivity, and programmable analog/digital architectures.
The TrueTouch® product line targets robust, noise-immune touchscreen controllers for harsh environments-specifically engineered for industrial, medical, and white-goods applications demanding reliability under moisture, gloves, and EMI stress.
FAQ
Does CYTT21401-44LQI28T support SPI communication?
No. This variant uses only I²C (100/400 kbps) for host communication. SPI support is exclusive to the 48-pin QFN package variants (e.g., CYTT21401-48LQI36T), as confirmed in the official datasheet revision *A ordering table.
What is the maximum supported touchscreen size and resolution?
The device supports up to 5.0-inch diagonal displays with 4.8-mm sensor pitch and 16:9 aspect ratio, yielding 308 measurable intersections (22 TX × 14 RX). Resolution is determined by sensor layout-not fixed pixel count-and scales with mechanical pitch.
How does ChargerArmor™ achieve 35-VPP immunity without external components?
ChargerArmor™ combines adaptive TX frequency hopping (avoiding charger harmonics), real-time baseline tracking, and correlated double sampling in the analog front-end-eliminating need for ferrite beads or RC filters while maintaining SNR above 35 dB.
Is Android™ driver support included out-of-the-box?
Yes. Cypress provides certified Android HAL drivers and kernel modules compatible with Android 4.0+; integration requires minimal platform-specific configuration for I²C address and interrupt mapping-no custom firmware development needed.
CYTT21401-44LQI28T 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)
CYTT21401-44LQI28T FAQ
1.How can I place an order for CYTT21401-44LQI28T through Aetrix?
Please submit a Request for Quotation (RFQ) for CYTT21401-44LQI28T 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 CYTT21401-44LQI28T reliable?
The price and inventory of CYTT21401-44LQI28T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYTT21401-44LQI28T is usually 5 days.
3.What payment methods are accepted for CYTT21401-44LQI28T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYTT21401-44LQI28T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYTT21401-44LQI28T?
CYTT21401-44LQI28T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYTT21401-44LQI28T 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 CYTT21401-44LQI28T?
For technical support, including CYTT21401-44LQI28T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYTT21401-44LQI28T requirements.
6.How does Aetrix verify that CYTT21401-44LQI28T is sourced from the original manufacturer or authorized distributors?
All CYTT21401-44LQI28T 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 CYTT21401-44LQI28T meets industry standards.
7.What is the process for return or replacement of CYTT21401-44LQI28T?
All CYTT21401-44LQI28T units undergo pre-shipment inspection (PSI). If there is an issue with CYTT21401-44LQI28T, 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 CYTT21401-44LQI28T part is unused and in its original packaging.
Return procedure for CYTT21401-44LQI28T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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