My Inquiry
My Account
Infineon Technologies CYTMA445A-44LQI28AB
- Part No.:
- CYTMA445A-44LQI28AB
- Manufacturer:
- Infineon Technologies
- Category:
- Touch Screen Controllers
- Package:
- 44-UFQFN Exposed Pad
- Datasheet:
-
CYTMA445A-44LQI28AB.pdf
- Description:
- IC MCU 32BIT 44QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,098
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CYTMA445A-44LQI28AB from Cypress Semiconductor is a multi-touch capacitive touchscreen controller featuring a 32-bit ARM® Cortex™ CPU, DualSense™ water rejection and wet-finger tracking, 28 sense I/O pins, 4.8-mm sensor pitch support, and 35-VPP charger noise immunity. It delivers up to 10-finger reporting at 300 Hz refresh rate for 5.0-inch diagonal displays in mobile handsets and portable medical devices.
For engineers reviewing the CYTMA445A-44LQI28AB datasheet, CYTMA445A-44LQI28AB pinout, CYTMA445A-44LQI28AB application, or CYTMA445A-44LQI28AB equivalent, key selection criteria include DualSense™ wet-finger capability, 44-pin QFN package compatibility, I²C interface timing, and 1.71–1.95-V digital supply operation.
Technical Context
The CYTMA445A-44LQI28AB implements a register-configurable capacitive sensing engine with hardware-accelerated mutual-capacitance scanning across 28 sense I/O lines, supporting Manhattan and diamond sensor patterns. Its DualSense™ architecture enables simultaneous self- and mutual-capacitance measurement for robust water rejection and glove operation.
ChargerArmor™ circuitry provides analog-domain suppression of 35-VPP charger noise without external filtering, while automatic baseline tracking adapts to temperature and humidity drift. The device uses external display synchronization signals to align touch acquisition with LCD frame timing, reducing display-induced noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Digital Supply Voltage | 1.71–1.95 V or 2.0–5.5 V - supports dual-rail operation with low-voltage logic interfacing |
| Analog Supply Voltage | 2.65–4.7 V - powers high-SNR analog front-end for stable capacitance measurement |
| Sense I/O Count | 28 pins - enables up to 308 node intersections (22 × 14) on 5.0-inch 16:9 touch panels |
| Max Refresh Rate | 300 Hz - ensures sub-3.4-ms latency for responsive gesture recognition |
| Charger Noise Immunity | 35 VPP - eliminates false touches during fast-charging with AT&T Zero chargers |
| Wet-Finger Tracking | DualSense™ enabled - maintains full 10-finger tracking under 2-mm water film |
| Deep-Sleep Power | 5.7 µW - extends battery life in always-on look-for-touch mode |
Pinout & Package
44-pin 5 × 5 × 0.6-mm QFN package with 0.35-mm lead pitch, thermally enhanced exposed pad for analog ground reference and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | Digital I/O supply | Accepts 1.71–5.5 V; powers GPIOs and I²C/SPI interface logic |
| VDDA | Analog supply | 2.65–4.7 V input for ADC, oscillator, and sensor driver circuitry |
| SDA / SCL | I²C bidirectional data/clock | Supports 100/400 kbps; open-drain with internal pull-ups |
| MISO / MOSI / SCLK / SS | SPI interface (not functional in 44-pin variant) | Reserved pins - SPI not available per datasheet Note 1 |
| SENSE[0:27] | Capsense electrode drivers/receivers | 28 configurable TX/RX pins for mutual-capacitance scanning |
| INT | Interrupt output | Active-low, open-drain signal indicating new touch report ready |
| RESET | Hardware reset input | Asynchronous active-low reset; debounced internally |
| GND / EPAD | Analog/digital ground & thermal pad | Must be soldered to PCB ground plane for EMI control and thermal stability |
Key Features
| Feature | Design Value |
|---|---|
| DualSense™ wet-finger tracking | Enables reliable multi-touch operation under 2-mm continuous water film without firmware recalibration |
| ChargerArmor™ noise suppression | Hardware-based analog filtering rejects 35-VPP charger ripple without requiring external RC networks |
| Automatic baseline tracking | Real-time compensation for environmental drift (±0.5 pF/hour) without host intervention |
| Glove mode switching | Auto-detects ≤1-mm thin glove (10 fingers) or ≤5-mm thick glove (2 fingers); no manual mode toggle required |
| Fingernail and grip suppression | Rejects non-finger inputs using spatial and temporal signature analysis, reducing false triggers |
Applications
| Smartphone Touch Interface | Medical Handheld Monitor |
|---|---|
Use Scenario: Capacitive touchscreen on 5.0-inch 16:9 smartphone display operating under fast-charging conditions with condensation risk. IC Role / Device Role / Timing Role: Primary mutual-capacitance controller performing real-time 300-Hz scanning, ChargerArmor™ noise cancellation, and DualSense™ water rejection. Use Value: Maintains full 10-finger gesture recognition during 35-VPP charger noise exposure and under 2-mm water layer. | Use Scenario: Sterile-gloved interaction with diagnostic tablet in clinical environments where gloves vary from 1-mm nitrile to 5-mm surgical. IC Role / Device Role / Timing Role: Adaptive touch controller enabling auto-switching between thin- and thick-glove modes without UI interruption. Use Value: Eliminates manual glove-mode selection; supports simultaneous 10-finger thin-glove and 2-finger thick-glove operation. |
| Industrial HMI Panel | POS Terminal Display |
Use Scenario: Touchscreen on factory-floor HMI exposed to coolant mist, metal debris, and frequent wipe-downs. IC Role / Device Role / Timing Role: Robust capacitive controller with large-object rejection and grip suppression to ignore tool contact and palm rests. Use Value: Prevents false triggers from metal tools or resting hands while maintaining finger-level precision for menu navigation. | Use Scenario: Retail point-of-sale terminal used with wet hands, food residue, or stylus input in high-traffic checkout lanes. IC Role / Device Role / Timing Role: Dual-mode controller supporting both bare-finger and fingernail/stylus input with automatic large-object rejection. Use Value: Enables accurate signature capture and item selection even with damp fingertips or accidental palm contact. |
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 | 22-sense I/O, no DualSense™, 20-VPP charger immunity, 3.3-V only supply | Lacks wet-finger tracking and advanced charger noise rejection; limited to dry-environment consumer tablets | Select when cost sensitivity outweighs water/glove requirements and panel size ≤4.3 inch |
| FT5436E6 | 48-sense I/O, no ChargerArmor™, requires external noise filtering, 1.8-V digital supply only | Higher node count but no integrated analog noise suppression; demands additional BOM components for charger noise | Select for larger panels (>5.5 inch) where external filtering design resources are available |
Compared with ATMXT224E-MAU and FT5436E6, the CYTMA445A-44LQI28AB uniquely integrates DualSense™ and ChargerArmor™ in a single 44-pin QFN, eliminating external analog filters and enabling reliable operation in wet, gloved, and high-noise charging environments.
Availability
CYTMA445A-44LQI28AB is available at Aetrix Electronics and suitable for smartphone touch interfaces, medical handheld monitors, industrial HMIs, and POS terminal displays requiring stable component supply and long-term lifecycle support.
Supply support for CYTMA445A-44LQI28AB 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 Corporation, now part of Infineon Technologies, designs programmable system-on-chip solutions for embedded control, connectivity, and human-machine interface applications.
The CYTMA445A belongs to the TrueTouch® family, engineered specifically for high-reliability capacitive touch control in noisy, wet, and gloved-use environments across mobile and industrial markets.
FAQ
Does CYTMA445A-44LQI28AB support SPI communication?
No. Although the CYTMA445A product family includes SPI support in the 48-pin QFN variant, the 44-pin package (including -44LQI28AB) disables all SPI pins per datasheet Note 1. Only I²C at 100/400 kbps is functional in this configuration.
What is the maximum supported sensor pitch for CYTMA445A-44LQI28AB?
The device supports a maximum sensor pitch of 4.8 mm, validated for 5.0-inch diagonal displays with 16:9 aspect ratio and 22 × 14 node layout (308 intersections). Larger pitches degrade SNR and may cause missed touches or reduced finger resolution.
How does DualSense™ enable wet-finger tracking without calibration?
DualSense™ uses concurrent self- and mutual-capacitance measurements to distinguish water film (uniform self-capacitance shift) from finger contact (localized mutual-capacitance delta). This hardware-based discrimination operates autonomously without host-triggered recalibration cycles.
Is the exposed thermal pad (EPAD) required to be connected to ground?
Yes. The EPAD must be soldered to a solid PCB ground plane. It serves as both analog ground reference for the sensing front-end and primary thermal path. Floating or unconnected EPAD causes increased noise, baseline instability, and potential thermal shutdown under sustained operation.
CYTMA445A-44LQI28AB 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)
CYTMA445A-44LQI28AB FAQ
1.How can I place an order for CYTMA445A-44LQI28AB through Aetrix?
Please submit a Request for Quotation (RFQ) for CYTMA445A-44LQI28AB 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 CYTMA445A-44LQI28AB reliable?
The price and inventory of CYTMA445A-44LQI28AB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYTMA445A-44LQI28AB is usually 5 days.
3.What payment methods are accepted for CYTMA445A-44LQI28AB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYTMA445A-44LQI28AB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYTMA445A-44LQI28AB?
CYTMA445A-44LQI28AB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYTMA445A-44LQI28AB 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 CYTMA445A-44LQI28AB?
For technical support, including CYTMA445A-44LQI28AB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYTMA445A-44LQI28AB requirements.
6.How does Aetrix verify that CYTMA445A-44LQI28AB is sourced from the original manufacturer or authorized distributors?
All CYTMA445A-44LQI28AB 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 CYTMA445A-44LQI28AB meets industry standards.
7.What is the process for return or replacement of CYTMA445A-44LQI28AB?
All CYTMA445A-44LQI28AB units undergo pre-shipment inspection (PSI). If there is an issue with CYTMA445A-44LQI28AB, 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 CYTMA445A-44LQI28AB part is unused and in its original packaging.
Return procedure for CYTMA445A-44LQI28AB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CYTMA445A-44LQI28AB Tags
-
TSC2046IPWR
Texas Instruments
-
TSC2007IPWR
Texas Instruments
-
TSC2046EIPWR
Texas Instruments
-
AR1021-I/SS
Microchip Technology
-
AR1020-I/SS
Microchip Technology
-
AR1100-I/MQ
Microchip Technology
-
AR1021T-I/ML
Microchip Technology
-
AR1100T-I/SS
Microchip Technology
-
TSC2003IPWR
Texas Instruments
-
TSC2004IRTJR
Texas Instruments
-
AR1100BRD
Microchip Technology
.jpg)
-
TSC2046IRGVR
Texas Instruments
Tech Hub
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
