Infineon Technologies CY8CMBR2044-24LKXIT

Overview

CY8CMBR2044-24LKXIT from Cypress Semiconductor is a hardware-configurable four-button capacitive touch controller with SmartSense™ Auto-Tuning, four active-low general-purpose outputs (GPOs), 1.71 V–5.5 V operation, and integrated system diagnostics. It drives LEDs directly, supports flanking sensor suppression (FSS), and operates across –40 °C to +85 °C in a 3 mm × 3 mm QFN-16 package for consumer, industrial, and medical UI applications.

For engineers reviewing the CY8CMBR2044-24LKXIT datasheet, CY8CMBR2044-24LKXIT pinout, CY8CMBR2044-24LKXIT application, or CY8CMBR2044-24LKXIT equivalent, key selection criteria include parasitic capacitance tolerance (5 pF–40 pF), deep sleep current (100 nA), GPO drive strength, hardware strap configuration logic, and serial debug data output capability for production test validation.

Technical Context

The CY8CMBR2044-24LKXIT implements a self-contained analog front-end with dedicated modulator capacitor (CMOD) input and four configurable CapSense® inputs (CS0–CS3), each mapped one-to-one to an active-low GPO (GPO0–GPO3). Its SmartSense™ algorithm dynamically adjusts sensing parameters-including baseline tracking, noise threshold, and scan resolution-based on real-time CP measurement and environmental noise detection.

Hardware configuration is performed at power-up via external resistor values on AI pins (Toggle/FSS, Delay, ARST, ScanRate/Sleep), enabling FSS activation, LED ON time (0–2000 ms), auto-reset timeout (5/20 s), and scan rate (20–30 ms). System diagnostics verify button shorts, CMOD value, and CP range compliance before enabling outputs.

Key Specifications

Pinout & Package

Package: 16-pin QFN (3 mm × 3 mm × 0.6 mm), exposed thermal pad, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar capacitive touch controller applications.

Compared with AT42QT2120-MAHR and TTP223B-BA6, the CY8CMBR2044-24LKXIT delivers autonomous operation without MCU dependency, hardware-based configurability, and production-ready diagnostics-making it optimal for rapid deployment of reliable, maintenance-free touch interfaces.

Availability

CY8CMBR2044-24LKXIT is available at Aetrix Electronics and suitable for home appliance control panels, medical device interfaces, industrial HMIs, and smart lighting systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for CY8CMBR2044-24LKXIT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Cypress Semiconductor (now part of Infineon Technologies) designs high-performance mixed-signal ICs for embedded systems, with expertise in programmable analog/digital architectures and human interface solutions.

The CapSense® family targets cost-sensitive, low-power touch interfaces where firmware-free operation, noise resilience, and production testability are critical-enabling rapid adoption in appliances, medical devices, and industrial controls.

FAQ

What external components are mandatory for basic operation?

The CY8CMBR2044-24LKXIT requires a 2.2 nF ±10% capacitor on the CMOD pin to ground for oscillator stability and proper CapSense operation. Each CSx pin needs a 560 Ω series resistor to its button electrode. VDD and VSS must be decoupled with ≥10 µF bulk and 0.1 µF ceramic capacitors. No pull-ups or pull-downs are needed on GPOs or CSx pins unless configuring advanced features.

How does SmartSense™ Auto-Tuning handle varying environmental conditions?

SmartSense™ continuously monitors signal-to-noise ratio (SNR) and parasitic capacitance (CP) during operation, automatically adjusting baseline tracking speed, noise threshold, and scan resolution. It compensates for temperature-induced CP drift, humidity effects, and PCB aging without user intervention-ensuring consistent button response across –40 °C to +85 °C and over product lifetime.

Can the GPOs drive standard LEDs directly without external transistors?

Yes-each GPO supports strong-drive mode with up to 20 mA sink current at VDD = 3.3 V, sufficient to drive common 20 mA LEDs with a series resistor (e.g., 560 Ω to VDD). The active-low output simplifies direct connection; no external MOSFET or transistor is required for typical indicator LEDs in consumer and industrial applications.

What diagnostics run at power-up, and how are failures indicated?

At power-up, the device checks for button shorts to VDD or ground, inter-button shorts, out-of-range CP (>40 pF), and incorrect CMOD value. If any fault is detected, corresponding GPOs remain in high-impedance state and do not activate; instead, a 5 ms active-low pulse is issued on affected GPOs after 175 ms, followed by logic HIGH-signaling failure to external monitoring circuitry or visual indicators.