CYTMA445A-44LQI

Touch Screen Controllers Overview

The CYTMA445A-44LQI is a multi-touch capacitive touchscreen controller from Cypress Semiconductor featuring a 32-bit ARM Cortex CPU. It supports up to 28 sense I/O pins and operates with a digital supply of 1.71–1.95 V or 2.0–5.5 V, alongside an analog supply of 2.65–4.7 V. The device provides effective 24-V drive for high signal-to-noise ratio and includes ChargerArmor technology offering immunity up to 35-V peak-to-peak. Communication interfaces include I²C at 100/400 kbps and SPI at up to 8 Mbps. It is housed in a 44-pin 5 × 5 × 0.6-mm QFN package.

Touch Screen Controllers Feature Summary

• Effective 24-V drive capability for enhanced signal-to-noise ratio
• ChargerArmor noise suppression providing immunity up to 35-V peak-to-peak
• Supports up to 28 sense I/O pins with configurations for screen sizes up to 5.0-inch diagonal
• Low-power operation with 4-mW average power and 5.7-μW typical deep-sleep power

Touch Screen Controllers Applications

• Mobile devices requiring multi-touch input
• Consumer electronics with capacitive touch interfaces
• Industrial control panels needing charger noise immunity

Touch Screen Controllers Procurement Notes

Verify the specific ordering suffix against the manufacturer's datasheet to confirm feature segmentation. The base part number indicates a 44-pin QFN package with 28 sense I/O pins. Confirm that the required features such as DualSense or glove tracking are included in the selected variant, as these are defined by the suffix codes rather than the base model alone.

Touch Screen Controllers Selection Notes

Select this component when a 44-pin footprint is required with support for up to 28 sense lines. Ensure the application environment necessitates the 35-Vpp charger noise immunity provided by the ChargerArmor feature. Verify that the system display synchronization requirements align with the external display sync capabilities documented for this family.

Touch Screen Controllers Part Context

This controller belongs to the TrueTouch Multi-Touch All-Points family. It shares core architecture with variants offering higher pin counts (33, 35, 36) or additional features like DualSense water rejection and face detection. The 44-pin version is distinct from the 48-pin variant which supports SPI communication.

Touch Screen Controllers Replacement Considerations

Direct replacements within the same package require matching the sense I/O count and feature set. Variants like CYTMA445A-44LQI33AA or CYTMA445A-44LQI35AA offer more sense pins but maintain the same package. Upgrading to the AB or AE suffix versions adds water rejection or face detection capabilities.