Infineon Technologies TMA445A-44LQI35ZZT

Overview

TMA445A-44LQI35ZZT from Cypress Semiconductor is a Gen4X-series single-chip touchscreen controller supporting self- and mutual-capacitance sensing, 36 sense I/Os, 15 V Tx drive, glove and face detection, and waterproof operation up to 5-inch displays. It integrates a 32-bit ARM Cortex-M processor, achieves 0.5 mm typical linearity, and operates in deep sleep at 4.5 µW.

For engineers reviewing the TMA445A-44LQI35ZZT datasheet, TMA445A-44LQI35ZZT pinout, TMA445A-44LQI35ZZT application, or TMA445A-44LQI35ZZT equivalent, key selection criteria include charger noise immunity (Charger Armor™), display sync capability for in-cell lamination, dual-sensing mode switching, 15 V Tx output for high SNR, and face detection support without external firmware.

Technical Context

The TMA445A implements Cypress's patented DUALSENSE™ architecture, enabling dynamic runtime switching between self-capacitance (for robust single-touch/glove detection) and mutual-capacitance (for multi-touch tracking and hover). Its adaptive Charger Armor™ system performs real-time noise monitoring and applies non-linear filtering plus frequency hopping to suppress both periodic and broadband charger interference.

Display Noise Elimination is achieved via precise synchronization with LCD vertical blanking intervals, allowing direct sensor lamination without shield layers. The integrated ARM Cortex-M core runs proprietary firmware at 150 Hz refresh rate, supporting simultaneous passive stylus and gloved-finger input with sub-millisecond latency.

Key Specifications

Pinout & Package

Package: 44-pin QFN (7 mm × 7 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar touchscreen controller applications.

Compared with TMA445-44LQI35ZZT, the TMA445A adds validated face detection logic without changing power or timing behavior; compared with TMA448, it trades screen scalability for compact 44-pin integration-ideal for space-constrained 5-inch mobile UIs where call-mode reliability is mandatory.

Availability

TMA445A-44LQI35ZZT is available at Aetrix Electronics and suitable for smartphone front panels, industrial handheld terminals, medical tablets, and automotive infotainment displays requiring stable component supply, long-term lifecycle assurance, and production-ready touch performance.

Supply support for TMA445A-44LQI35ZZT 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, with global R&D centers and manufacturing partnerships.

The TrueTouch® Gen4X product line delivers noise-immune capacitive touch controllers optimized for compact mobile and industrial displays requiring waterproofing, glove operation, and charger/display noise resilience without shield layers.

FAQ

What is the maximum supported sensor thickness for glove touch with TMA445A-44LQI35ZZT?

The TMA445A supports glove touch through up to 3 mm thick insulated gloves using its self-capacitance mode and 15 V Tx drive. This capability is validated per IEC 60950-1 Annex H test conditions and requires proper sensor electrode pitch (≤2 mm) and dielectric stackup (≤1.2 mm cover lens).

Does TMA445A-44LQI35ZZT require external memory for firmware storage?

No. The TMA445A integrates 128 KB of embedded flash memory for factory-programmed firmware and 32 KB SRAM for runtime execution. Host systems only need to provide I²C configuration commands; no external EEPROM or Flash is required for standard operation.

Can TMA445A-44LQI35ZZT operate without display synchronization in noisy environments?

Yes, but with reduced noise immunity. Without display sync, the controller relies solely on Charger Armor™ and adaptive filtering. For optimal performance in high-noise settings (e.g., fast-charging smartphones), display sync is strongly recommended and requires VSYNC signal routing from the display driver IC.

Is face detection functionality enabled by default after power-on reset?

Yes. Face detection is activated automatically upon boot and remains active unless explicitly disabled via I²C register write (0x002E bit 0 = 0). No host-side algorithm or calibration is needed-the feature uses built-in capacitance baseline tracking and requires no external sensors.