Infineon Technologies CY8CMBR2110-24LQXIT

Overview

CY8CMBR2110-24LQXIT from Cypress Semiconductor is a register-configurable CapSense® Express™ 10-button capacitive touch controller with integrated GPOs, SmartSense™ auto-tuning, and I²C interface. It supports 10 analog input buttons (CS0–CS9), 10 dedicated active-low GPOs (GPO0–GPO9), buzzer outputs, analog voltage output capability via GPOs, and attention-line interrupt signaling - all in a 32-pin QFN package operating from 1.71 V to 5.5 V across –40 °C to +85 °C.

For engineers reviewing the CY8CMBR2110-24LQXIT datasheet, CY8CMBR2110-24LQXIT pinout, CY8CMBR2110-24LQXIT application, or CY8CMBR2110-24LQXIT equivalent, key selection considerations include SmartSense auto-tuning range (5–40 pF CP), deep sleep current (100 nA), I²C speed (up to 100 kHz, no clock stretching), flanking sensor suppression (FSS), and system diagnostics for button shorts/CMOD/CP faults.

Technical Context

The CY8CMBR2110 implements a self-contained capacitive sensing engine with hardware-based SmartSense auto-tuning that dynamically adjusts scan parameters-including IDAC, integration time, and resolution-based on real-time parasitic capacitance (5–40 pF) and noise conditions. Its 10-button architecture uses dedicated analog inputs tied one-to-one with corresponding GPOs, enabling direct LED drive or host-controlled logic without firmware.

It features dual buzzer outputs (BuzzerOut0/BuzzerOut1), two host-controllable GPOs (HostControlGPO0/1), an attention/sleep line for host-managed power-state coordination, and diagnostic reporting of CMOD value, button shorts, and CP out-of-range at power-up - all accessible via I²C registers without host-side algorithm implementation.

Key Specifications

Pinout & Package

Package: 32-pin QFN (5 mm × 5 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 AT42QT1070-MAHR and STMPE1600QTR, the CY8CMBR2110-24LQXIT delivers full 10-button autonomy with hardware FSS, SmartSense, and integrated GPO/buzzer - reducing total solution size, qualification time, and production test complexity.

Availability

CY8CMBR2110-24LQXIT is available at Aetrix Electronics and suitable for consumer appliance control panels, industrial HMI keypads, medical device user interfaces, and smart home wall switches requiring stable component supply, long-term lifecycle support, and validated noise immunity.

Supply support for CY8CMBR2110-24LQXIT 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) is a fabless semiconductor company specializing in programmable system-on-chip (PSoC), memory, and human-machine interface solutions since 1982.

The CY8CMBR2110 belongs to the CapSense Express™ family - designed specifically for rapid deployment of robust, low-power capacitive touch interfaces without firmware development or manual tuning.

FAQ

Does CY8CMBR2110-24LQXIT require firmware programming to operate?

No. The device is register-configurable via I²C and ships preloaded with default settings. All functionality - including button sensitivity, LED effects, buzzer behavior, and diagnostics - is enabled through EZ-Click Customizer or host writes to configuration registers. No on-chip firmware coding, compilation, or flashing is needed for basic or advanced operation.

What is the role of the CMOD pin and what capacitor value must be used?

The CMOD pin connects to an external 2.2 nF ±10% ceramic capacitor to ground. This capacitor sets the reference for the internal delta-sigma modulator and directly impacts baseline stability and signal-to-noise ratio. Using values outside tolerance causes erratic button response or failure to detect touches; Cypress specifies 2.2 nF as the only validated value for guaranteed SmartSense operation across temperature and voltage.

Can GPO pins drive LEDs directly, and what are the current limits?

Yes - GPO0–GPO9 are active-low, open-drain outputs rated for 20 mA sink current each. With a 5 kΩ pull-up to VDD (e.g., 3.3 V), they deliver ~0.66 mA - sufficient for indicator LEDs. For higher-brightness LEDs, external MOSFETs or buffer drivers are recommended. BuzzerOut0/1 support up to 10 mA peak for piezo or AC buzzers.

How does the Attention/Sleep pin function in system-level power management?

The Attention/Sleep pin serves dual roles: as an open-drain interrupt (active-low) signaling any button state change to the host MCU, and as a control input to force the CY8CMBR2110 into deep sleep (100 nA) or wake it. When pulled low by the host, the device enters deep sleep; when released, it wakes and resumes scanning - enabling synchronized low-power system behavior without polling.