CYTMA545-44LQI33AA

Overview

The CYTMA545-44LQI33AA is a TrueTouch multi-touch capacitive touchscreen controller featuring a 32-bit ARM Cortex CPU. It supports up to 10 fingers with a fast first-touch response of ≤13 ms and a configurable refresh rate up to 300 Hz. The device operates on a 1.71 V to 5.5 V digital supply and a 2.65 V to 5.5 V analog supply, consuming 5.6 mW average power. Communication is handled via I2C (up to 3.4 Mbps) or SPI (up to 10 Mbps). It includes ChargerArmor noise immunity and DualSense water rejection technologies.

Feature Summary

• Reports up to 10 simultaneous touch points with support for small fingers down to 4 mm and large fingers up to 30 mm.
• Features DualSense technology for water rejection and wet finger tracking.
• Includes ChargerArmor for high charger noise immunity, supporting up to 60 V peak-to-peak voltage.
• Supports screen sizes up to 5.0-inch diagonal with up to 33 sense pins and 299 intersections.

Applications

• Smartphones and mobile devices requiring multi-touch input
• Tablets and portable media players
• Industrial control panels with glove or stylus interaction needs

Procurement Notes

Verify the specific ordering suffix AA against current manufacturer documentation to confirm feature sets. Confirm package availability in tape and reel or tray formats as specified by the supplier. Ensure compatibility with the target display interface and sensor stackup before procurement.

Selection Notes

Select this model for applications requiring up to 10 touch points and DualSense water rejection. The 44-pin QFN package limits sense pins to 33, suitable for screens up to 4.5 inches. Consider higher pin variants if larger displays or additional features like stylus support are required.

Part Context

The CYTMA545 belongs to the Cypress TrueTouch family of all-points multi-touch controllers. This series integrates advanced noise suppression and environmental tracking algorithms into a single chip, designed to replace discrete touch sensing solutions in compact electronic devices.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided datasheet. Verify cross-compatibility with existing firmware drivers when considering alternative components from other manufacturers.

FAQ

What is the maximum number of touch points supported?

The CYTMA545-44LQI33AA supports reporting up to 10 simultaneous touch points.

Does this controller support operation in wet conditions?

Yes, it includes DualSense technology specifically designed for water rejection and wet finger tracking.

What communication interfaces are available?

The device supports I2C slave at standard bit rates up to 3.4 Mbps and SPI slave at bit rates up to 10 Mbps.