CYTT21401-44LQI28T

Overview

The CYTT21401-44LQI28T is a TrueTouch multi-touch capacitive touchscreen controller featuring a 32-bit ARM Cortex CPU. It supports up to ten fingers, wet-finger tracking, and glove operation with automatic mode switching. The device operates on a 1.71–1.95 V or 2.0–5.5 V digital supply and a 2.65–4.7 V analog supply. It includes ChargerArmor noise immunity up to 35-V peak-to-peak and external display synchronization. Communication interfaces include I2C at 100/400 kbps and SPI (in 48-pin variants). It is housed in a 44-pin 5 × 5 × 0.6-mm QFN package.

Feature Summary

• Multi-touch support for up to ten fingers with small finger detection down to 4 mm
• DualSense technology for water rejection and wet-finger tracking
• ChargerArmor noise immunity supporting up to 35-V peak-to-peak interference
• Automatic baseline tracking and grip suppression

Applications

• Smartphones and mobile devices
• Tablets and portable media players
• Industrial control panels
• Medical equipment interfaces

Procurement Notes

Verify the specific suffix 'T' indicates tape and reel packaging as per Cypress ordering definitions. Confirm that the 44-pin variant does not include SPI support, which is reserved for the 48-pin package. Ensure compatibility with the target Android driver stack and bootloader requirements for field upgrades.

Selection Notes

Select this model for applications requiring wet-finger tracking and glove operation without SPI interface needs. Compare against CYTT21402 if advanced wake features are required. Verify sensor pitch and intersection counts align with the target display size of up to 5.0 inches diagonal.

Part Context

Part of the CYTT21XXX TrueTouch family designed for low-end to mid-range white goods and consumer electronics. It shares core architecture with CYTT21100 and CYTT21402 variants but offers specific I/O counts and feature sets tailored for compact form factors.

Replacement Considerations

Direct substitutes within the same package include CYTT21401-44LQI33(T) and CYTT21401-44LQI35(T), differing only in sense I/O count. For enhanced wake capabilities, consider CYTT21402-44LQI28(T).