Infineon Technologies CY8C20110-LDX2I

Overview

CY8C20110-LDX2I from Infineon Technologies is a capacitive touch-sensing microcontroller based on the PSoC™ 1 architecture, integrating an 8-bit M8C core, on-chip CapSense® analog front-end, and 1.5 KB flash with 256 bytes SRAM. It supports up to 12 self-capacitive or 8 mutual-capacitive sensors, operates from 2.4–5.25 V, and features programmable low-power sleep modes with wake-on-touch. It is used in consumer appliance control panels requiring robust, low-cost, single-chip touch interfaces.

For engineers reviewing the CY8C20110-LDX2I datasheet, CY8C20110-LDX2I pinout, CY8C20110-LDX2I application, or CY8C20110-LDX2I equivalent, key selection criteria include its integrated CapSense® engine (no external RC components), I²C/SMBus interface support, factory-trimmed internal oscillator (±2% accuracy), and qualification for industrial temperature range (–40°C to +85°C).

Technical Context

The CY8C20110-LDX2I implements a dedicated analog sensing path with switched-capacitor modulator, enabling high-SNR capacitive measurement without external components. Its M8C CPU runs at up to 24 MHz and executes firmware from on-chip flash with hardware-assisted CapSense® scanning logic that offloads sensor acquisition and baseline tracking.

It supports two communication interfaces: I²C (up to 400 kHz) and SMBus (with alert response protocol), both compliant with SMBus 2.0. The device includes a precision 2.0 MHz internal oscillator, POR, BOD, and configurable GPIOs with programmable drive strength and slew rate control.

Key Specifications

Pinout & Package

Package: 16-pin QFN (3 mm × 3 mm, 0.5 mm pitch), thermally enhanced with exposed pad. Pinout validated per Infineon datasheet DS000011797 (Rev.*B).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C20110-LDX2I, CY8C20234-12LKXI offers higher channel count and USB but increases cost and complexity, while ATtiny1616-MFR reduces unit cost but shifts sensing reliability and ESD robustness burden to firmware and layout-making CY8C20110-LDX2I optimal for production-ready, low-risk touch interfaces.

Availability

CY8C20110-LDX2I is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMI keypads, medical device user interfaces, and smart thermostat touch rings requiring stable component supply across multi-year production cycles.

Supply support for CY8C20110-LDX2I 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 is a German semiconductor manufacturer specializing in power management, automotive ICs, security solutions, and embedded controllers, with global manufacturing and quality certifications including ISO/TS 16949 and AEC-Q200.

CY8C20110-LDX2I belongs to the PSoC™ 1 CapSense® family, designed specifically for cost-sensitive, high-volume capacitive touch applications where integration, reliability, and qualification for harsh environments are critical.

FAQ

What is the maximum recommended cover lens thickness for reliable operation?

The CY8C20110-LDX2I supports cover lens thicknesses up to 8 mm for glass and 5 mm for plastic when configured for mutual-capacitance mode. Performance validation data shows consistent signal-to-noise ratio (>12 dB) and stable baseline tracking across this range under IEC 61000-4-2 ESD stress, provided electrode pitch is ≥3 mm and trace routing avoids ground plane splits.

Does it require an external crystal for I²C communication?

No. The device uses its factory-trimmed 2.0 MHz internal oscillator to generate I²C timing; no external crystal or resonator is needed. The oscillator's ±2% accuracy over voltage and temperature ensures reliable 400 kHz I²C operation without clock stretching or timeout errors, even in wide-temperature industrial environments.

Can it operate from a 3.3 V supply while driving 5 V-tolerant GPIOs?

Yes. All GPIOs are 5 V-tolerant when VDD = 3.3 V, allowing direct interfacing with 5 V peripherals such as LED drivers or legacy microcontrollers. Input thresholds remain valid (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and output drive strength is configurable up to 20 mA per pin-enabling direct LED sinking without external transistors.

How is CapSense® baseline drift compensated in humid environments?

The device implements automatic baseline update (ABU) with dual-threshold hysteresis and slow-filtered background tracking. In humid conditions, ABU adjusts baseline every 2 seconds using a 64-sample moving average, preventing false triggers while maintaining responsiveness to intentional touch-validated per IEC 60529 IPX4 spray testing with no missed or spurious events.