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Infineon Technologies CYTT21100-48LQI36T
- Part No.:
- CYTT21100-48LQI36T
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 48-UFQFN Exposed Pad
- Datasheet:
-
CYTT21100-48LQI36T.pdf
- Description:
- IC MCU TRUETOUCH 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,710
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Product details
Overview
CYTT21100-48LQI36T from Cypress Semiconductor is a 32-bit ARM® Cortex™-based multi-touch capacitive touchscreen controller with 36 sense I/Os, 48-pin QFN package, 300 Hz refresh rate, and 500 kHz TX frequency-designed for 5.0-inch diagonal touchscreens in industrial HMI and medical devices.
For engineers reviewing the CYTT21100-48LQI36T datasheet, CYTT21100-48LQI36T pinout, CYTT21100-48LQI36T application, or CYTT21100-48LQI36T equivalent, key selection factors include its 36-sense-pin configuration, SPI interface support (exclusive to 48-pin variant), ChargerArmor™ noise immunity up to 35 VPP, DualSense™ wet-finger tracking, and glove-mode operation with automatic switching.
Technical Context
This controller implements a register-configurable capacitive sensing architecture with dedicated hardware acceleration for mutual-capacitance scanning across up to 308 intersections (22 × 14). Its ARM Cortex CPU handles real-time touch processing, baseline tracking, and firmware-based gesture interpretation without host intervention.
The device integrates analog front-end circuitry optimized for high-SNR operation at 24-V effective drive voltage and supports external display synchronization to suppress LCD-induced noise. It natively enables Single-Layer Independent Multi-touch (SLIM®) and Manhattan sensor patterns on PET/glass substrates with metal-mesh compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sense I/O Count | 36 pins-enables 22 × 14 (308) mutual-capacitance nodes for full-screen all-points touch on 5.0-inch 16:9 displays |
| Refresh Rate | Up to 300 Hz-supports responsive UI navigation and fast swipe detection in portable medical interfaces |
| TX Frequency | Up to 500 kHz-improves SNR and enables robust operation under high-frequency EMI environments |
| Charger Noise Immunity | 35 VPP peak-to-peak-guarantees stable touch reporting during USB charging with AT&T Zero and other noisy adapters |
| Digital Supply Range | 1.71–1.95 V or 2.0–5.5 V-allows direct interfacing with 1.8-V or 3.3-V host processors without level-shifting |
| Deep-Sleep Power | 5.7 µW-enables battery-powered remote controls and portable diagnostics equipment to maintain multi-week standby life |
| Interface Support | I²C (100/400 kbps) and SPI (up to 8 Mbps)-SPI available only in 48-pin QFN, enabling high-throughput firmware updates and streaming touch data |
Pinout & Package
48-pin 6 × 6 × 0.6-mm QFN package with 0.4-mm lead pitch, thermally enhanced exposed pad for improved heat dissipation in sealed industrial enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | Digital I/O supply | Accepts 1.71–5.5 V; powers GPIOs, I²C/SPI interface, and internal logic-supports mixed-voltage system integration |
| VDDA | Analog supply | 2.65–4.7 V input for ADC, charge pump, and sensor driver circuits-requires separate low-noise filtering |
| SCL / SDA | I²C bus interface | Open-drain bidirectional lines compliant with standard and fast-mode I²C timing; pull-up required externally |
| SCLK / MOSI / MISO / SS | SPI slave interface | Full-duplex SPI with 8 Mbps max clock-enables rapid configuration and high-bandwidth touch report streaming |
| INT | Interrupt output | Active-low open-drain signal asserted when new touch data is ready-reduces host polling overhead |
| RST | Hardware reset input | Asynchronous active-low reset-required for bootloader entry and recovery from fault conditions |
| TX[0:17] | Transmit electrode drivers | 18 configurable TX outputs supporting flexible routing for Manhattan, SLIM®, or diamond sensor layouts |
| RX[0:17] | Receive electrode inputs | 18 differential RX inputs with programmable gain and filtering-paired with TX for mutual-capacitance scanning |
Key Features
| Feature | Design Value |
|---|---|
| DualSense™ wet-finger tracking | Simultaneous detection and rejection of water droplets while maintaining accurate finger position-enables reliable operation in humid clinical or kitchen environments |
| ChargerArmor™ noise immunity | Hardware-accelerated suppression of charger-induced common-mode noise up to 35 VPP-eliminates need for external shielding or complex firmware compensation |
| Glove mode with auto-switching | Automatic transition between bare-finger (≤4 mm), thin-glove (≤1 mm), and thick-glove (≤5 mm) detection-no user-initiated mode change required |
| Field-upgradable firmware | On-chip bootloader supports secure over-the-air (OTA) updates via I²C or SPI-enables post-deployment feature enhancements and calibration refinements |
| Panel ID reporting & self-test | Integrated sensor stack identification and electrical continuity verification-reduces factory test time and improves yield traceability |
Applications
| Industrial HMI Panels | Portable Medical Devices |
|---|---|
Use Scenario: Touchscreen interface on sealed IP65-rated control panels in factory automation systems. IC Role / Device Role / Timing Role: All-points mutual-capacitance controller performing real-time touch coordinate calculation and gesture recognition independent of host MCU. Use Value: ChargerArmor™ ensures uninterrupted operation during simultaneous AC/DC power supply transitions; 36 I/Os support 5.0-inch 16:9 displays with 10-finger tracking for multi-operator workflows. | Use Scenario: Battery-powered handheld diagnostic tool with glove-compatible touchscreen used in clinical settings. IC Role / Device Role / Timing Role: Low-power touch acquisition engine delivering sub-10-ms latency touch reports to ARM host processor via SPI. Use Value: 5.7 µW deep-sleep power extends battery life beyond 3 weeks; DualSense™ maintains accuracy during hand-washing or saline exposure. |
| Home Appliance Control | Automotive Infotainment Prototypes |
Use Scenario: Oven/microwave control panel requiring wet-finger and condensation tolerance. IC Role / Device Role / Timing Role: Capacitive sensing subsystem managing button overlays, sliders, and proximity wake-up using integrated CapSense® functionality. Use Value: Automatic baseline tracking compensates for temperature drift across -20°C to +70°C ambient range; large-object rejection prevents false triggers from steam or utensils. | Use Scenario: Development platform for automotive-grade infotainment evaluation with AMOLED display integration. IC Role / Device Role / Timing Role: Sensor interface IC synchronizing scan timing with display frame rate to eliminate visual artifacts during scrolling. Use Value: External display sync capability eliminates LCD noise coupling; SLIM® pattern support enables cost-effective single-layer FPC routing in space-constrained dashboards. |
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 |
|---|---|---|---|
| ATMXT224E-MAU | 224-node max resolution (16 × 14), no SPI interface, 40-pin QFN, 1.8-V only digital supply | Limited to smaller displays (<4.3 inch); lacks ChargerArmor™ and wet-finger tracking | Select for cost-sensitive consumer appliances where charger noise and moisture are not primary concerns |
| FT5436E3-AS | ARM Cortex-M0+ core, 48-pin QFN, supports 10-finger tracking but only 200 Hz max refresh rate and 20-V charger immunity | Lower SNR performance; no native SLIM® or metal-mesh sensor support | Choose when Android HAL compatibility is prioritized over industrial-grade noise immunity and sensor flexibility |
Compared with ATMXT224E-MAU and FT5436E3-AS, CYTT21100-48LQI36T delivers superior noise resilience (35 VPP), broader sensor compatibility (SLIM®, metal mesh), and higher-resolution scanning (308 nodes), making it optimal for mission-critical industrial and medical touch interfaces where reliability outweighs BOM cost.
Availability
CYTT21100-48LQI36T is available at Aetrix Electronics and suitable for industrial HMI panels, portable medical diagnostics, and home appliance control systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for CYTT21100-48LQI36T 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.
This device belongs to the TrueTouch® family-engineered specifically for robust, noise-immune, multi-touch capacitive sensing in harsh electromagnetic environments including medical, industrial, and automotive-adjacent applications.
FAQ
Does CYTT21100-48LQI36T support SPI communication?
Yes, CYTT21100-48LQI36T supports SPI slave operation up to 8 Mbps, but this interface is exclusive to the 48-pin QFN package variant. The 44-pin versions do not implement SPI hardware. SPI signals (SCLK, MOSI, MISO, SS) are assigned to dedicated pins and require proper termination and clock domain synchronization with the host controller.
What is the maximum supported touchscreen size and resolution?
CYTT21100-48LQI36T supports up to 5.0-inch diagonal displays with 16:9 aspect ratio and 4.8-mm sensor pitch. Its 36 sense I/Os enable 22 × 14 (308-node) mutual-capacitance scanning-sufficient for full all-points tracking at 10-finger resolution without interpolation or node sharing.
How does ChargerArmor™ improve noise immunity compared to standard capacitive controllers?
ChargerArmor™ combines adaptive common-mode noise cancellation, dynamic TX frequency hopping, and hardware-based correlation filtering to suppress interference from USB chargers up to 35 VPP peak-to-peak. Unlike software-only mitigation, it operates in real time within the analog front end, preserving touch latency and eliminating false touches during charging events.
Is wet-finger tracking enabled by default, and does it require calibration?
Yes, DualSense™ wet-finger tracking is enabled by default and requires no user calibration. It uses dual-sensing methodology-simultaneously measuring self- and mutual-capacitance changes-to distinguish water droplets from finger contact. Factory-trimmed parameters ensure consistent performance across temperature and humidity ranges without field recalibration.
CYTT21100-48LQI36T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 48-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:
- 48-QFN (6x6)
CYTT21100-48LQI36T FAQ
1.How can I place an order for CYTT21100-48LQI36T through Aetrix?
Please submit a Request for Quotation (RFQ) for CYTT21100-48LQI36T 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 CYTT21100-48LQI36T reliable?
The price and inventory of CYTT21100-48LQI36T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYTT21100-48LQI36T is usually 5 days.
3.What payment methods are accepted for CYTT21100-48LQI36T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYTT21100-48LQI36T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYTT21100-48LQI36T?
CYTT21100-48LQI36T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYTT21100-48LQI36T 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 CYTT21100-48LQI36T?
For technical support, including CYTT21100-48LQI36T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYTT21100-48LQI36T requirements.
6.How does Aetrix verify that CYTT21100-48LQI36T is sourced from the original manufacturer or authorized distributors?
All CYTT21100-48LQI36T 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 CYTT21100-48LQI36T meets industry standards.
7.What is the process for return or replacement of CYTT21100-48LQI36T?
All CYTT21100-48LQI36T units undergo pre-shipment inspection (PSI). If there is an issue with CYTT21100-48LQI36T, 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 CYTT21100-48LQI36T part is unused and in its original packaging.
Return procedure for CYTT21100-48LQI36T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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