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Infineon Technologies CYTT21403-56LQI44T
- Part No.:
- CYTT21403-56LQI44T
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 56-UFQFN Exposed Pad
- Datasheet:
-
CYTT21403-56LQI44T.pdf
- Description:
- IC MCU 32BIT 56QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,158
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Product details
Overview
CYTT21403-56LQI44T from Cypress Semiconductor is a TrueTouch® multi-touch all-points touchscreen controller featuring a 32-bit ARM® Cortex™ CPU, 44 sense I/Os, support for up to 10 simultaneous touches, and integrated DualSense™ for water/wet-finger tracking. It delivers 35-VPP charger noise immunity via ChargerArmor™, supports 2.5-mm passive stylus with automatic mode switching, and operates with 9-mW average power in active mode for portable touch interfaces.
For engineers reviewing the CYTT21403-56LQI44T datasheet, CYTT21403-56LQI44T pinout, CYTT21403-56LQI44T application, or CYTT21403-56LQI44T equivalent, key selection criteria include its 44-sense-I/O QFN package, glove-touch capability (thin/thick), passive stylus handling, and I²C/SPI interface compatibility with Android™ and embedded HMI systems.
Technical Context
This controller implements a register-configurable capacitive sensing architecture with dedicated hardware acceleration for mutual-capacitance scanning across up to 44 sense lines. Its ARM Cortex-M core executes real-time touch processing firmware, including baseline tracking, large-object rejection, and palm suppression algorithms without host CPU intervention.
The device integrates analog front-end circuitry optimized for high-SNR operation at up to 500 kHz TX frequency and supports flexible sensor routing-including Manhattan, diamond, SLIM®, and metal-mesh patterns-enabling single-layer FPC designs for on-cell and SOL touch-integrated displays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sense I/O Count | 44 pins - enables full multi-touch coverage on mid-size panels (e.g., 5.5-inch 16:9 with 4.0-mm electrode pitch) |
| Max Simultaneous Touches | 10 fingers - supports complex gestures and multi-user interaction in consumer HMI |
| Charger Noise Immunity | 35 VPP - ensures stable operation during fast-charging with legacy and AT&T® Zero chargers |
| Active Power Consumption | 9 mW - enables battery-powered devices to sustain >1-week standby with periodic look-for-touch polling |
| Interface Options | I²C (100/400 kbps) and SPI (up to 8 Mbps) - provides flexibility for low-pin-count or high-throughput host integration |
| Stylus Support | 2.5-mm passive stylus with auto-mode switching - eliminates manual UI mode toggling during mixed finger/stylus input |
| Glove Mode | Thin glove (≤1 mm) / thick glove (≤5 mm) - maintains usability in industrial, medical, or cold-environment applications |
Pinout & Package
Package: 56-pin QFN (6 × 6 × 0.6 mm, 0.35-mm lead pitch), thermally enhanced with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | Digital/I/O supply | 1.71–1.95 V or 2.0–5.5 V - supports direct connection to system I/O rails without level-shifting |
| VDDA | Analog supply | 2.65–4.7 V - powers sensitive analog front-end; requires local low-noise filtering |
| SCL/SDA | I²C interface | Open-drain, 3.3-V tolerant - compatible with standard I²C host controllers and pull-up resistors |
| SPI_CS/SPI_SCLK/SPI_MOSI/SPI_MISO | SPI interface | CMOS inputs/outputs - enables high-speed configuration and raw scan data streaming |
| INT | Interrupt output | Active-low, open-drain - signals host when new touch report is ready or gesture event occurs |
| RST | Hardware reset | Asynchronous active-low - initiates full internal state reset and bootloader entry if held during power-up |
Key Features
| Feature | Design Value |
|---|---|
| DualSense™ wet-finger tracking | Enables reliable touch detection under condensation or light rain without false triggers or latency increase |
| ChargerArmor™ noise suppression | Eliminates need for external shielding or layout guard rings when used with high-noise USB-C fast chargers |
| Automatic glove-mode switching | Switches between bare-finger, thin-glove, and thick-glove profiles dynamically based on signal amplitude and decay characteristics |
| Fingernail and large-object rejection | Discriminates fingernails (≥3 mm contact area) and palm rests (>30 mm diameter) using spatial and temporal signature analysis |
| Field-upgradable firmware | Supports secure over-the-air (OTA) updates via bootloader without requiring JTAG or physical reprogramming |
Applications
| Smart Home Control Panel | Industrial HMI Terminal |
|---|---|
Use Scenario: Wall-mounted kitchen display with ambient moisture and frequent glove use during food preparation. IC Role / Device Role / Timing Role: Primary capacitive touch controller managing 44-sensor grid, executing real-time wet-finger and glove-mode classification. Use Value: Maintains 10-finger gesture recognition despite condensation and allows operation with cotton or nitrile gloves without UI mode switching. | Use Scenario: Factory-floor operator terminal exposed to ESD, oil mist, and 24/7 operation with mechanical stylus input. IC Role / Device Role / Timing Role: All-points touch processor with integrated ChargerArmor™ and passive stylus detection for precise annotation tasks. Use Value: Rejects large-area palm contact during stylus use and sustains SNR >45 dB under 35-VPP charger noise from nearby equipment. |
| Medical Tablet Interface | Automotive Infotainment Display |
Use Scenario: Disinfectant-wiped tablet used by clinicians wearing latex or vinyl gloves of varying thickness. IC Role / Device Role / Timing Role: Touch controller with adaptive baseline tracking and dual-threshold glove detection logic. Use Value: Delivers consistent 4-mm small-finger resolution and seamless transition between bare-finger and ≤5-mm glove modes without calibration. | Use Scenario: In-vehicle center console with AMOLED display, fast-charging USB ports, and driver/passenger multi-touch demands. IC Role / Device Role / Timing Role: Multi-touch engine supporting 300-Hz refresh and synchronized display TX timing to suppress LCD-induced noise. Use Value: Enables swipe/gesture responsiveness <80 ms while rejecting interference from vehicle-level 12-V DC-DC ripple and USB-PD chargers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-touch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CYTT21401-56LQI44T | Lacks passive stylus support; same glove and ChargerArmor™ features | Not suitable for applications requiring 2.5-mm stylus input or mixed stylus/finger workflows | Select when cost sensitivity outweighs stylus functionality and panel size remains ≤5.5 inch |
| CYTT31702-56LQI48T | 48-sense-I/O, adds Easy Wake gesture support, higher max touch count (10), same stylus/glove features | Requires larger sensor grid; supports wake-from-off LCD gestures like swipe-to-unlock | Select for premium-tier devices needing deeper power-state control and expanded I/O for larger panels |
Compared with CYTT21401-56LQI44T, this part adds passive stylus capability without increasing power or footprint; versus CYTT31702-56LQI48T, it trades 4 I/Os and Easy Wake for tighter BOM cost and simpler layout on 44-line sensor arrays.
Availability
CYTT21403-56LQI44T is available at Aetrix Electronics and suitable for smart home control panels, industrial HMI terminals, medical tablets, and automotive infotainment displays requiring stable component supply and long-term lifecycle support.
Supply support for CYTT21403-56LQI44T 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 programmable system-on-chip solutions for embedded control, connectivity, and human interface applications.
CYTT21X series belongs to the TrueTouch® family, engineered specifically for robust, noise-immune capacitive touch control in consumer, industrial, and automotive environments with demanding EMI and environmental conditions.
FAQ
What is the maximum supported electrode pitch for CYTT21403-56LQI44T at 5.5-inch screen size?
The device supports up to 4.0-mm electrode pitch on 5.5-inch diagonal 16:9 displays, enabling high-resolution mutual-capacitance sensing with 44 sense lines and optimal SNR. This pitch aligns with standard sensor stackups using ITO or metal mesh on glass or PET substrates.
Does CYTT21403-56LQI44T require external crystal or oscillator?
No external crystal is required: the controller integrates a precision internal oscillator for system clock generation and supports optional external clock input only for advanced synchronization with display timing signals. Internal RC accuracy meets ±2% over industrial temperature range.
How does ChargerArmor™ achieve 35-VPP noise immunity without external filtering?
ChargerArmor™ combines adaptive digital notch filtering, real-time TX frequency dithering, and correlated double sampling in the analog front-end to suppress common-mode and differential-mode noise from switch-mode chargers - eliminating need for ferrite beads or LC filters in most layouts.
Can CYTT21403-56LQI44T operate with both I²C and SPI simultaneously?
No - the interface is selected at boot via hardware strapping (GPIO configuration) or firmware initialization; only one interface is active at a time. I²C is default for Android™ integration; SPI is used where higher bandwidth is needed for raw scan data or custom host protocols.
CYTT21403-56LQI44T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 56-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:
- 56-QFN (6x6)
CYTT21403-56LQI44T FAQ
1.How can I place an order for CYTT21403-56LQI44T through Aetrix?
Please submit a Request for Quotation (RFQ) for CYTT21403-56LQI44T 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 CYTT21403-56LQI44T reliable?
The price and inventory of CYTT21403-56LQI44T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYTT21403-56LQI44T is usually 5 days.
3.What payment methods are accepted for CYTT21403-56LQI44T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYTT21403-56LQI44T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYTT21403-56LQI44T?
CYTT21403-56LQI44T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYTT21403-56LQI44T 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 CYTT21403-56LQI44T?
For technical support, including CYTT21403-56LQI44T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYTT21403-56LQI44T requirements.
6.How does Aetrix verify that CYTT21403-56LQI44T is sourced from the original manufacturer or authorized distributors?
All CYTT21403-56LQI44T 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 CYTT21403-56LQI44T meets industry standards.
7.What is the process for return or replacement of CYTT21403-56LQI44T?
All CYTT21403-56LQI44T units undergo pre-shipment inspection (PSI). If there is an issue with CYTT21403-56LQI44T, 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 CYTT21403-56LQI44T part is unused and in its original packaging.
Return procedure for CYTT21403-56LQI44T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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