Infineon Technologies CY8C201A0-LDX2I

Overview

CY8C201A0-LDX2I from Infineon (formerly Cypress) is a capacitive-sensing PSoC™ 1 programmable system-on-chip with integrated CapSense® technology, 8-bit M8C core, 2 KB flash, 256 B SRAM, and 12 I/O pins. It supports self- and mutual-capacitance sensing for up to 12 buttons/sliders, operates from 2.4–5.25 V, and features an on-chip oscillator with ±2% accuracy. It is used in touch-enabled human-machine interfaces for industrial control panels and consumer appliances.

For engineers reviewing the CY8C201A0-LDX2I datasheet, CY8C201A0-LDX2I pinout, CY8C201A0-LDX2I application, or CY8C201A0-LDX2I equivalent, key selection criteria include its fixed-function CapSense® block, lack of USB/UART peripherals, single-supply operation, and qualification for industrial temperature range (–40°C to +85°C).

Technical Context

The CY8C201A0-LDX2I implements a dedicated hardware CapSense® block that performs baseline tracking, noise filtering, and finger detection without CPU intervention. Its M8C CPU runs at up to 24 MHz and supports interrupt-driven sensor scanning, low-power sleep modes (including deep sleep with wake-on-touch), and configurable I/O drive strength (2–10 mA).

It lacks analog comparators, op-amps, or ADCs - all signal conditioning for capacitive sensing is handled by the fixed-function digital block. The device uses a single internal reference clock and does not support external crystal or resonator inputs; timing stability relies entirely on its trimmed internal oscillator.

Key Specifications

Pinout & Package

Package: 16-pin QFN (3 mm × 3 mm, 0.5 mm pitch), thermally enhanced with exposed pad (EP). Pin 1 marked by dot; EP must be soldered to PCB ground plane for thermal and EMI performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C201A0-LDX2I, CY8C20234-SX2I offers expanded memory and I²C for host integration, while ATtiny412-MFR trades hardware sensing fidelity for lower unit cost and broader ecosystem tooling - choice depends on noise environment, communication needs, and firmware complexity.

Availability

CY8C201A0-LDX2I is available at Aetrix Electronics and suitable for industrial HMI panels, home appliance controls, medical device interfaces, and point-of-sale terminals requiring stable component supply and long-term manufacturability.

Supply support for CY8C201A0-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 AG is a German semiconductor manufacturer specializing in power management, automotive ICs, security solutions, and microcontrollers, with global R&D and manufacturing infrastructure.

This part belongs to the legacy PSoC™ 1 family, designed specifically for cost-sensitive, low-complexity capacitive touch applications where deterministic real-time sensing and minimal external components are critical.

FAQ

What is the maximum overlay thickness supported by CY8C201A0-LDX2I?

The device supports up to 8 mm acrylic or 4 mm glass overlay thickness in self-capacitance mode, verified per Cypress Application Note AN2292. Sensitivity is adjustable via firmware register settings, and mutual-capacitance mode supports thinner overlays (≤3 mm) with higher noise immunity.

Does CY8C201A0-LDX2I support I²C or UART communication?

No - CY8C201A0-LDX2I has no on-chip UART, I²C, SPI, or USB peripherals. Communication with a host MCU must be implemented using GPIO-based protocols (e.g., bit-banged I²C or custom serial) or by treating it as a fully autonomous touch node with status outputs.

Can CY8C201A0-LDX2I operate from a 1.8 V supply?

No - the absolute minimum supply voltage is 2.4 V per the datasheet. Operation below this threshold causes undefined behavior, including CapSense® block malfunction and flash corruption. A 3.3 V regulator is required if the system uses 1.8 V logic elsewhere.

Is there a drop-in replacement for CY8C201A0-LDX2I with extended temperature range?

No - Infineon does not offer a pin-compatible variant rated beyond –40°C to +85°C. For extended temperature operation, redesign with PSoC™ 4 devices (e.g., CY8C4014LQI-SX240) is required, which involve different firmware architecture and layout changes.