Infineon Technologies CY8CMBR2110-24LQXI

Overview

CY8CMBR2110-24LQXI from Cypress Semiconductor is a register-configurable CapSense® Express™ 10-button capacitive touch controller with integrated GPOs, SmartSense™ Auto-Tuning, and I²C interface. It delivers 10 analog CapSense inputs (CS0–CS9), 10 dedicated GPOs (GPO0–GPO9), buzzer outputs, attention interrupt, and analog voltage output capability via GPOs - all in a 32-pin QFN (5 mm × 5 mm). Used in battery-powered HMI panels requiring zero-firmware touch control.

For engineers reviewing the CY8CMBR2110-24LQXI datasheet, CY8CMBR2110-24LQXI pinout, CY8CMBR2110-24LQXI application, or CY8CMBR2110-24LQXI equivalent, key selection factors include SmartSense auto-tuning range (5–40 pF CP), ultra-low deep-sleep current (100 nA), I²C speed (100 kHz, no clock stretching), GPO logic polarity (active-low), and system diagnostics for CMOD/CP faults at power-up.

Technical Context

The CY8CMBR2110-24LQXI implements a self-contained capacitive sensing engine with hardware-based SmartSense Auto-Tuning that dynamically adjusts scan parameters-including modulation frequency, IDAC gain, and averaging-based on real-time parasitic capacitance (5–40 pF) and noise conditions. It requires no firmware and operates independently of host CPU intervention during button detection.

Its I²C interface supports slave-only operation with fixed 7-bit address (0x38 default), no clock stretching, and read/write access to 128+ configuration registers. All 10 GPOs are directly mapped to corresponding CSx inputs by default but can be reconfigured as host-controlled or buzzer outputs via register writes.

Key Specifications

Pinout & Package

32-pin Quad Flat No-leads (QFN), 5 mm × 5 mm body, 0.5 mm pitch, exposed thermal pad (VSS-connected). Pin 1 marked by top-side dot; pin numbering follows standard counter-clockwise QFN convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT42QT1070-MAHR and STM32F070CBT6, the CY8CMBR2110-24LQXI uniquely delivers 10-button auto-tuned operation with zero firmware, sub-100 nA sleep, and production-ready diagnostics - making it optimal for volume consumer and industrial HMIs where time-to-market and supply stability are critical.

Availability

CY8CMBR2110-24LQXI is available at Aetrix Electronics and suitable for consumer appliance control panels, medical device interfaces, industrial HMIs, and smart home wall controllers requiring stable component supply, long-lifecycle availability, and zero-firmware touch implementation.

Supply support for CY8CMBR2110-24LQXI 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 leadership in programmable analog/digital architectures and human interface solutions.

The CY8CMBR2110 belongs to the CapSense® Express™ family, engineered specifically for rapid deployment of robust, low-power capacitive touch interfaces without firmware development - targeting appliance, medical, and industrial UI markets.

FAQ

Does CY8CMBR2110-24LQXI require firmware programming to operate?

No. The device is register-configurable via I²C and ships preloaded with factory-default settings enabling immediate 10-button operation. Configuration is performed using Cypress's EZ-Click Customizer tool or host processor - no on-chip firmware coding, flash programming, or bootloader setup is needed. All CapSense algorithms, LED effects, and diagnostics run in dedicated hardware.

What is the role of the CMOD pin and what capacitor value is required?

The CMOD pin connects to an external 2.2 nF ±10% ceramic capacitor (recommended X7R dielectric) to ground. This capacitor sets the fundamental oscillation frequency and baseline stability for the CapSense measurement engine. Deviation beyond ±10% causes measurable SNR degradation and may trigger system diagnostics indicating "CMOD value out of range" at power-up.

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

Yes - all 10 GPO pins are active-low open-drain outputs rated for 20 mA sink current (absolute max), sufficient to drive standard 2–20 mA LEDs with appropriate external pull-up (e.g., 5 kΩ to VDD). Driving multiple LEDs simultaneously must stay within total package current limit (100 mA typical), and thermal derating applies above 70°C ambient.

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

The Attention/Sleep pin serves dual roles: as an active-low interrupt (Attention) signaling button state change to host MCU, or as a sleep control input (Sleep) that forces the device into deep-sleep mode when held high. Its state is sampled at power-up to determine initial mode; I²C commands can later reconfigure its function without hardware change.