CY8CMBR3110-SX2IT

Overview

The CY8CMBR3110-SX2IT is a register-configurable capacitive touch controller from the CY8CMBR3xxx family, designed for human-machine interfaces without firmware development. It supports up to 10 capacitive sensing inputs and operates within a supply voltage range of 1.71 V to 5.5 V. The device features an I2C interface supporting speeds up to 400 kHz and includes General-Purpose Outputs (GPOs) for direct LED driving or buzzer control. It utilizes SmartSense Auto-tuning and CSD PLUS algorithms to ensure high noise immunity and liquid tolerance across an industrial temperature range of -40 °C to +85 °C.

Feature Summary

• SmartSense Auto-tuning dynamically maintains optimal sensor performance and eliminates manual tuning during production.
• Liquid tolerance prevents false touches caused by water droplets, mist, or streaming water through shield electrode configurations.
• Flanking Sensor Suppression distinguishes between signals from closely spaced buttons to eliminate false touches.

Applications

• Capacitive button interfaces replacing mechanical switches
• Proximity sensing solutions with wake-on-approach capabilities
• User interface systems requiring audio-visual feedback via LEDs or buzzers

Procurement Notes

Verify the specific suffix 'SX2IT' against the manufacturer's official ordering guide to confirm package type and reel specifications. Ensure compatibility with I2C bus requirements and check humidity sensitivity handling procedures for surface-mount assembly processes.

Selection Notes

Select this model when exactly ten capacitive sensing channels are required. Compare against the CY8CMBR3108 for eight-channel needs or the CY8CMBR3116 for sixteen-channel applications. Confirm that the SOIC-16 package fits the PCB layout constraints and that the host processor supports the necessary I2C communication protocol.

Part Context

This component belongs to the CY8CMBR3xxx CapSense Express family, which provides register-configurable capacitive sensing controllers. The family shares common core technologies like CSD PLUS sensing and SmartSense Auto-tuning but varies in the number of supported sensors and specific output features.

Replacement Considerations

Direct functional replacements within the same package include other variants from the CY8CMBR3xxx series such as the CY8CMBR3108 or CY8CMBR3116, provided the pinout and feature set align with the design requirements. Verify register map compatibility if migrating between different channel counts.

FAQ

Does the CY8CMBR3110 require firmware development?

No, the CY8CMBR3110 is a register-configurable controller that eliminates the need for firmware development. Features are configured via the I2C interface using tools like the EZ-Click Customizer.

What is the maximum refresh interval current consumption?

The average current consumption is 22 µA per sensor at a 120-ms refresh interval.

How does the device handle wet conditions?

It offers liquid tolerance by locking up the user interface in firmware to prevent false touches from water droplets, mist, or streaming water, especially when shield electrodes are enabled.