CY8CMBR3108-LQXI

Overview

The CY8CMBR3108-LQXI is a register-configurable capacitive touch controller from the CapSense Express family. It supports up to eight capacitive sensing inputs, configured as buttons or proximity sensors. The device operates on a supply voltage range of 1.71 V to 5.5 V and features an I2C interface supporting speeds up to 400 kHz. It utilizes the CSD PLUS sensing algorithm for high noise immunity and includes SmartSense Auto-tuning for dynamic performance maintenance. The component is housed in a 16-lead QFN package (3x3 mm) and functions within an industrial temperature range of -40 °C to +85 °C.

Feature Summary

• Register-configurable architecture eliminates firmware development requirements
• SmartSense Auto-tuning dynamically compensates for environmental variations
• Liquid tolerance prevents false touches caused by moisture or water droplets
• Integrated system diagnostics detect sensor shorts and improper capacitor values

Applications

• Capacitive button interfaces replacing mechanical switches
• Proximity detection systems requiring wake-on-approach functionality
• User interfaces with visual feedback via LED driving outputs
• Audio feedback implementations using buzzer signal outputs

Procurement Notes

Verify the specific ordering suffix against official Infineon documentation to confirm packaging type and reel specifications. Ensure compatibility with the host system's I2C voltage levels and address configuration. Confirm that the selected variant meets the required number of sensing channels and output capabilities for the target application design.

Selection Notes

Select this model when eight sensing channels are sufficient for the interface design. Compare against other family members like the CY8CMBR3116 if additional sliders or proximity sensors are needed. Consider the 16-QFN package dimensions for PCB layout constraints. Verify power consumption requirements against the active and deep sleep modes specified in the datasheet.

Part Context

This component belongs to the CY8CMBR3xxx family of CapSense Express controllers. The family shares common features such as the CSD PLUS algorithm and SmartSense technology but varies in channel count and specific peripheral support. The CY8CMBR3108 specifically targets applications requiring eight sensing inputs without slider support.

Replacement Considerations

Direct replacements within the same package include other CY8CMBR3108 variants with different suffixes indicating packaging options. For increased channel counts, consider the CY8CMBR3116. For reduced channel counts, evaluate the CY8CMBR3102 or CY8CMBR3002.