Infineon Technologies CY8C20140-LDX2I

Overview

CY8C20140-LDX2I from Infineon (formerly Cypress) is a capacitive touch-sensing microcontroller based on the PSoC™ 1 architecture, featuring an 8-bit M8C core, integrated CapSense® charge-transfer sensing engine, 4 KB flash, 256 B SRAM, and up to 16 GPIOs in a 16-pin QFN package. It supports self- and mutual-capacitance sensing with <15 µA active current and operates from 2.4–5.25 V. It is deployed in consumer appliance control panels requiring robust, low-power touch buttons and sliders.

For engineers reviewing the CY8C20140-LDX2I datasheet, CY8C20140-LDX2I pinout, CY8C20140-LDX2I application, or CY8C20140-LDX2I equivalent, key selection criteria include its dedicated CapSense® hardware acceleration, programmable IDAC for sensor calibration, I²C/SMBus interface support, and industrial temperature range (–40°C to +85°C) - all critical for reliable human-interface design in cost-sensitive embedded systems.

Technical Context

The CY8C20140-LDX2I integrates a dedicated analog front-end for capacitive sensing, including a switched-capacitor IDAC, SAR ADC, and programmable gain amplifier, enabling high-SNR touch detection without external components. Its M8C CPU executes firmware at up to 24 MHz and supports interrupt-driven sensor scanning with configurable scan resolution (8–16 bits).

It features a single I²C/SMBus slave interface for host communication, no UART or SPI, and uses internal precision oscillators (1, 2, or 24 MHz) - eliminating need for external crystals. The device lacks USB, DMA, or bootloader ROM, targeting fixed-function, low-complexity touch applications only.

Key Specifications

Pinout & Package

Package: 16-pin QFN (3 mm × 3 mm, 0.5 mm pitch), thermally enhanced with exposed pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C20140-LDX2I, the CY8C201A0-LDX2I offers headroom for feature growth without layout change, while the ATtiny412-MFR trades sensing fidelity and power efficiency for broader MCU ecosystem access - making the CY8C20140-LDX2I optimal for production touch nodes where reliability and BOM simplicity are prioritized.

Availability

CY8C20140-LDX2I is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMIs, automotive interior controls, and medical device user interfaces requiring stable component supply and long-term manufacturability.

Supply support for CY8C20140-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, and embedded security solutions, with global R&D and manufacturing infrastructure.

CY8C20140-LDX2I belongs to the legacy PSoC™ 1 family, designed specifically for cost-optimized, single-function capacitive touch applications - emphasizing low power, high noise immunity, and rapid time-to-market for consumer and industrial HMI designs.

FAQ

Does CY8C20140-LDX2I support mutual-capacitance sensing?

Yes, it supports both self- and mutual-capacitance sensing modes via its hardware CapSense® engine. Mutual-capacitance configuration enables true multi-touch detection on slider or matrix layouts, with built-in cross-talk cancellation and dynamic baseline adjustment - confirmed in the official CY8C201xx datasheet (Rev.*1.1, Section 5.2).

Can CY8C20140-LDX2I operate without an external crystal?

Yes - it uses factory-trimmed internal oscillators (1 MHz, 2 MHz, or 24 MHz) with ±2% accuracy across –40°C to +85°C and 2.4–5.25 V supply. No external crystal or resonator is required, reducing BOM count and PCB area, as verified in the device's Oscillator System chapter (DS00001119, Section 7.1).

What is the maximum number of independent touch buttons supported?

It supports up to 16 independent electrodes (P0[0]–P0[7] and P1[0]–P1[7]), each configurable as a self-capacitance button or mutual-capacitance TX/RX pair. With mutual-capacitance, a 4×4 matrix yields 16 nodes; with self-capacitance, all 16 pins function as discrete buttons - per CapSense® Design Guide (AN2292, Table 1-1).

Is CY8C20140-LDX2I pin-compatible with other PSoC™ 1 devices?

No - it is not pin-compatible with other PSoC™ 1 variants like CY8C21x34 or CY8C22x34 due to differing QFN pad counts (16 vs. 24/28 pins) and internal peripheral mapping. The LDx2I suffix denotes the 16-pin QFN package; migration requires PCB redesign and firmware adaptation.