Infineon Technologies CY8CMBR2044-24LKXI

Overview

CY8CMBR2044-24LKXI 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 industrial temperature range (–40 °C to +85 °C). It drives LEDs directly, supports flanking sensor suppression (FSS), and performs system diagnostics at power-up for button shorts, CMOD faults, and parasitic capacitance (CP) out of range (5 pF–40 pF).

For engineers reviewing the CY8CMBR2044-24LKXI datasheet, CY8CMBR2044-24LKXI pinout, CY8CMBR2044-24LKXI application, or CY8CMBR2044-24LKXI equivalent, key selection criteria include GPO drive strength (strong-drive, active-low), hardware strap configuration for toggle/FSS/LED timing, serial debug data capability, and deep-sleep current (100 nA) for battery-powered UI designs.

Technical Context

The CY8CMBR2044-24LKXI implements a self-contained analog front-end with integrated modulator capacitor interface (CMOD pin), digital logic for SmartSense™ runtime parameter adaptation, and configurable analog input/output pins (CS0–CS3, GPO0–GPO3) that serve dual roles in CapSense sensing and serial debug output. Its hardware-strapped architecture eliminates firmware dependencies.

It uses a dedicated analog circuit for noise-immune capacitive measurement, supports flanking sensor suppression to resolve adjacent button crosstalk, and delivers deterministic GPO timing-e.g., 5 ms active-low pulse on power-up if diagnostics fail, and programmable LED ON time (0–2000 ms in 20 ms steps) triggered on button release.

Key Specifications

Pinout & Package

16-pin QFN package (3 mm × 3 mm × 0.6 mm, 0.5 mm pitch), wettable flank, 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 CY8CMBR2044-24LKXI delivers true standalone operation with hardware-configured advanced features, built-in diagnostics, and wide-voltage support-making it optimal for cost-sensitive, battery-powered, or safety-critical UIs where MCU resources are constrained or unavailable.

Availability

CY8CMBR2044-24LKXI is available at Aetrix Electronics and suitable for home appliance control panels, medical device user interfaces, industrial HMI keypads, and smart lighting wall switches requiring stable component supply, long lifecycle support, and RoHS-compliant packaging.

Supply support for CY8CMBR2044-24LKXI 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 technologies.

The CY8CMBR2044 belongs to Cypress's CapSense® family of hardware-configurable touch controllers, engineered specifically for rapid deployment of robust, low-power capacitive touch interfaces in cost-sensitive consumer, industrial, and medical products.

FAQ

What external components are mandatory for basic operation?

The CY8CMBR2044-24LKXI requires a 2.2 nF ±10% capacitor connected from CMOD to ground for oscillator stability and proper sensing. Each CapSense button (CS0–CS3) needs a series resistor (typically 560 Ω) between the electrode and the pin. VDD and VSS must be decoupled with ≥10 µF bulk and 0.1 µF ceramic capacitors. No firmware or programming tools are needed.

How does SmartSense™ Auto-Tuning adapt to environmental changes?

SmartSense™ continuously monitors signal-to-noise ratio (SNR) and parasitic capacitance (CP) during operation, then automatically adjusts IDAC current, scan resolution, and baseline tracking parameters in real time. This maintains consistent button sensitivity across temperature shifts, humidity variations, and aging effects-without requiring recalibration or host intervention.

Can GPO pins drive standard 20 mA LEDs directly?

Yes-GPO pins operate in strong-drive mode and can sink up to 25 mA (per pin, typical) at VDD = 5.5 V, sufficient for most indicator LEDs. For higher-current loads or voltage-level shifting, external MOSFETs remain optional. The datasheet specifies minimum sink current of 10 mA at VDD = 3.3 V with 0.4 V drop, confirming direct LED drive capability under common operating conditions.

Is serial debug data compatible with standard UART interfaces?

No-serial debug data is a proprietary asynchronous bitstream output on CSx pins (when configured), not UART. It requires Cypress-provided test software or custom logic analyzer decoding to extract Cp, SNR, and raw count values. The format is documented in the CY8CMBR2044 Design Guide and used exclusively for production validation-not runtime communication.