Infineon Technologies CY8CMBR3110-SX2IT

Overview

CY8CMBR3110-SX2IT from Infineon Technologies (formerly Cypress) is a register-configurable CapSense Express™ capacitive touch controller supporting 10 sensing inputs, SmartSense auto-tuning, and I²C interface. It delivers >100:1 SNR, 0.1 pF sensitivity, and liquid-tolerant operation for robust button/slider/proximity interfaces in industrial HMI and consumer electronics.

For engineers reviewing the CY8CMBR3110-SX2IT datasheet, CY8CMBR3110-SX2IT pinout, CY8CMBR3110-SX2IT application, or CY8CMBR3110-SX2IT equivalent, key selection criteria include sensing input count (10), SmartSense auto-tuning capability, I²C slave support up to 400 kHz, deep-sleep current (22 µA/sensor), and industrial temperature range (–40 °C to +85 °C).

Technical Context

The CY8CMBR3110-SX2IT implements the Capacitive Sigma Delta PLUS (CSD PLUS) sensing algorithm with dedicated analog front-end circuitry, enabling high-resolution capacitance measurement down to 0.1 pF. Its SmartSense Auto-tuning continuously adjusts baseline and thresholds to compensate for environmental drift and manufacturing variation.

It operates as an I²C slave with wake-on-address-match capability, supports up to eight high-sink GPOs for LED drive, and integrates system diagnostics for CMOD capacitor validation, sensor short detection, and parasitic capacitance (5–45 pF) monitoring - all without firmware development.

Key Specifications

Pinout & Package

Package: 16-pin SOIC (150 mil), 10.3 mm × 7.5 mm body, 1.27 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8CMBR3108-SX2IT, the CY8CMBR3110-SX2IT adds two sensing inputs without increasing package size or power; versus AT42QT2120-MAHR, it eliminates production-line tuning effort and improves long-term reliability in variable environments.

Availability

CY8CMBR3110-SX2IT is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMI terminals, and medical device user interfaces requiring stable component supply, long-lifecycle support, and automotive-grade reliability validation.

Supply support for CY8CMBR3110-SX2IT 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

Infineon Technologies acquired Cypress Semiconductor in 2020 and now owns and supports the full CapSense portfolio, including design, manufacturing, and technical documentation.

The CY8CMBR3xxx product line was engineered specifically for rapid-deployment capacitive touch interfaces in cost-sensitive, noise-prone, and environmentally variable applications - eliminating firmware development while ensuring production-ready robustness.

FAQ

What is the maximum overlay thickness supported by CY8CMBR3110-SX2IT?

The device supports up to 15 mm of glass or 5 mm of plastic overlay thickness while maintaining reliable 0.1 pF sensitivity. This is achieved through the CSD PLUS algorithm and programmable gain settings, validated per JEDEC JESD22-A114E ESD testing at ±8 kV contact discharge.

Does CY8CMBR3110-SX2IT require external firmware or host processor intervention for basic operation?

No. The device is fully register-configurable via I²C and performs all sensing, filtering, and auto-tuning autonomously. Host intervention is only needed for configuration changes or reading status registers - no real-time polling or firmware execution is required.

How does SmartSense Auto-tuning adapt to environmental changes?

SmartSense continuously monitors baseline capacitance and noise floor across all 10 channels, dynamically adjusting integration time, reference voltage, and threshold levels every 120 ms. It maintains stable performance across humidity swings from 20% to 95% RH and temperature shifts from –40 °C to +85 °C without recalibration.

Can CY8CMBR3110-SX2IT drive LEDs directly without external transistors?

Yes. Its eight GPO pins each support 20 mA sink current at VDD ≥ 3.0 V, sufficient to drive standard 20 mA LEDs directly. Current-limiting resistors must be placed in series with each LED anode; no external MOSFETs or drivers are required for typical indicator applications.