CY8CMBR2016-24LQXI

Overview

The CY8CMBR2016-24LQXI is a hardware-configurable CapSense Express controller supporting up to 16 capacitive touch buttons. It operates within a voltage range of 1.71 V to 5.5 V and supports industrial temperatures from -40 °C to +85 °C. The device integrates SmartSense auto-tuning, Flanking Sensor Suppression (FSS), and system diagnostics. It features three host interface modes: Key Scan, Truth Table, and Encoded GPO. Power consumption is as low as 20 µA per button in run mode and 100 nA in deep sleep. The component is housed in a 48-pin QFN package measuring 6 × 6 × 0.6 mm.

Feature Summary

• Hardware-configurable matrix controller eliminating the need for software programming or firmware coding.
• SmartSense auto-tuning algorithm dynamically adjusts parameters to maintain performance across environmental variations.
• Flanking Sensor Suppression (FSS) enables robust sensing for closely spaced buttons in small form factors.
• Built-in system diagnostics detect faults such as button shorts and improper capacitor values at power-up.

Applications

• Fire alarm control panels
• Security systems
• Door locks

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm pinout and feature configurations. Confirm that the required external components, such as the 2.2 nF modulator capacitor, are included in the bill of materials. Ensure the design accommodates the 48-pin QFN footprint and thermal requirements specified in the datasheet.

Selection Notes

Select this component when a hardware-only solution for up to 16 buttons is required without microcontroller programming. Consider the Key Scan interface for retrofitting mechanical keypads or the Encoded GPO interface to minimize host I/O pins. Evaluate the Deep Sleep mode capabilities if ultra-low standby current is critical for battery-operated applications.

Part Context

This part belongs to the Cypress CapSense Express family, now under Infineon Technologies. These controllers are designed to replace mechanical switches with capacitive touch interfaces. The series emphasizes ease of integration through hardware configuration and automatic tuning, targeting cost-sensitive consumer and industrial electronics.

Replacement Considerations

Check for updated revisions within the CY8CMBR2016 series. Verify compatibility with existing host firmware if migrating between different output interface modes.