CYTT21401-44LQI28

Overview

The CYTT21401-44LQI28 is a TrueTouch multi-touch capacitive touchscreen controller featuring a 32-bit ARM Cortex CPU. It supports up to ten fingers with wet-finger tracking and glove operation. The device operates on a 1.71V–5.5V digital supply and a 2.65V–4.7V analog supply, consuming 4mW average power. Communication interfaces include I2C at 100/400 kbps and SPI up to 8 Mbps. It is housed in a 44-pin 5x5mm QFN package.

Feature Summary

• DualSense technology for water rejection and wet-finger tracking
• ChargerArmor noise immunity supporting up to 35-V peak-to-peak drive
• Automatic baseline tracking and grip suppression
• Supports flexible TX/RX configurations for single-layer FPC routing

Applications

• Smartphones and tablets with displays up to 5.0-inch diagonal
• Industrial controls and navigation systems
• Medical devices requiring glove operation support
• Home appliances and white goods with touch interfaces

Procurement Notes

Verify the component status as obsolete based on distributor records. Confirm availability of replacement parts from Infineon or Cypress if production continuity is required. Ensure design-in documentation matches the specific ordering code suffixes for tape and reel options.

Selection Notes

Select this model for applications requiring advanced wet-finger tracking and glove compatibility. Verify that the system design accommodates the 44-pin QFN package dimensions. Ensure the host processor supports the required I2C or SPI communication speeds for data transfer.

Part Context

This part belongs to the CYTT21XXX family of TrueTouch controllers. Variants differ by sense pin count (28, 33, 35, 36) and feature sets like glove support. The CYTT21401 specifically includes wet-finger tracking and glove capabilities within the 44-pin QFN form factor.

Replacement Considerations

Check for CYTT21402-44LQI28 for enhanced glove features. Consider CYTT21401-44LQI33 or CYTT21401-44LQI35 for different I/O counts. Verify pinout compatibility before substituting.