CY8CMBR2044-24LKXIT

Overview

The CY8CMBR2044 is a four-button CapSense controller featuring SmartSense auto-tuning and hardware configuration. It operates within a voltage range of 1.71 V to 5.5 V and supports an industrial temperature range from -40 °C to +85 °C. The device provides four general-purpose outputs (GPOs) linked directly to capacitive sensing buttons, enabling direct LED drive capabilities. Supply current in run mode is as low as 15 µA per button, with deep sleep consumption at 100 nA. It utilizes a 16-pad QFN package measuring 3 mm × 3 mm × 0.6 mm.

Feature Summary

• Hardware-configurable operation eliminates the need for software tools or programming.
• SmartSense auto-tuning dynamically adjusts parameters to maintain performance across environmental variations.
• Integrated system diagnostics perform power-on self-tests to detect faults such as button shorts or improper capacitor values.
• Advanced features include toggle functionality, flanking sensor suppression, and configurable LED on-time.

Applications

• Consumer appliances requiring simple capacitive touch interfaces
• Industrial control panels needing robust noise immunity
• Medical devices utilizing battery-powered operation

Procurement Notes

Verify component authenticity through authorized Infineon distributors or certified partners. Confirm the specific ordering suffix matches the required package and temperature grade. Request original datasheets and compliance documentation to ensure adherence to RoHS standards. Validate supply chain integrity to prevent counterfeit components.

Selection Notes

Select this controller for designs requiring up to four independent capacitive inputs without microcontroller complexity. Ensure parasitic capacitance remains below 40 pF for proper operation. Verify that the application environment falls within the specified voltage and temperature limits. Consider the QFN package dimensions for PCB layout constraints.

Part Context

This component belongs to the Cypress CapSense Express family, now part of Infineon Technologies' portfolio. It represents a dedicated solution for capacitive sensing applications, distinct from programmable SoCs like PSoC. The series focuses on ease of integration and reduced development time through hardware configurability.

Replacement Considerations

Check official Infineon documentation for qualified substitute part numbers within the CY8CMBR2xxx series. Ensure functional compatibility regarding pinout and feature sets before substitution.

FAQ

How is the device configured?

The CY8CMBR2044 is configured entirely through external resistors connected to hardware pins. No software programming or development tools are required.

What is the function of the CMOD pin?

The CMOD pin requires an external modulator capacitor, typically 2.2 nF (±10%), connected to ground for proper CapSense operation.

How does the device handle button faults?

System diagnostics perform a power-on self-test. If a button is shorted to ground, VDD, or another button, it is disabled, and a diagnostic pulse is sent to the corresponding GPO.