Infineon Technologies CY8C4025LQI-S401

Overview

CY8C4025LQI-S401 from Infineon is a 32-bit Arm® Cortex®-M0+ microcontroller with 24 KB flash, 4 KB SRAM, and integrated CAPSENSE™ capacitive sensing. It operates from 1.71 V to 5.5 V, supports Deep Sleep mode at 2.5 µA, and delivers best-in-class SNR (>5:1) for water-tolerant touch interfaces in consumer HMI and industrial control panels.

For engineers reviewing the CY8C4025LQI-S401 datasheet, CY8C4025LQI-S401 pinout, CY8C4025LQI-S401 application, or CY8C4025LQI-S401 equivalent, key selection criteria include its 48-MHz CPU performance, dual SCB blocks (I²C/SPI/UART), five TCPWM timers with comparator-triggered kill signals, and programmable analog blocks including two IDACs and low-power comparators.

Technical Context

The device integrates a single-core Arm® Cortex®-M0+ CPU running at up to 48 MHz with single-cycle multiply, coupled with a flexible digital fabric of programmable logic blocks and fixed-function peripherals including TCPWM, SCB, and GPIO routing matrix. Its analog subsystem includes a sigma-delta CAPSENSE™ engine, two current DACs, and two comparators operational in Deep Sleep mode.

System-level timing relies on multiple clock sources: ±2% internal main oscillator (IMO), 32 kHz watch crystal oscillator (WCO), and 32 kHz internal low-power oscillator (ILO). The device uses a single-layer AHB-Lite interconnect and supports SWD debug without external pods, enabling full on-chip firmware and hardware co-debugging.

Key Specifications

Pinout & Package

CY8C4025LQI-S401 is housed in a 40-pin QFN package (6 mm × 6 mm, 0.5 mm pitch) with exposed thermal pad. All GPIOs support programmable drive modes, slew rates, and analog/digital/CAPSENSE™ functions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable MCU applications.

Compared with CY8C4025LQI-S401, the TQFP variant offers more I/O and thermal headroom for industrial use, while the S412 variant trades memory and peripherals for lower unit cost - selection depends strictly on I/O count, timing accuracy, and power budget requirements.

Availability

CY8C4025LQI-S401 is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMI terminals, medical device keypads, and smart lighting dimmers requiring stable component supply and long-term lifecycle support.

Supply support for CY8C4025LQI-S401 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 MCUs, and secure embedded solutions, with global R&D and manufacturing infrastructure.

CY8C4025LQI-S401 belongs to the PSoC™ 4000S family - designed specifically for cost-optimized, CAPSENSE™-centric embedded applications requiring high noise immunity, ultra-low-power operation, and rapid HMI development.

FAQ

What development tools are officially supported for CY8C4025LQI-S401?

Infineon officially supports both ModusToolbox™ (cross-platform, Eclipse-based) and PSoC™ Creator (Windows-only IDE) for firmware development. ModusToolbox™ provides peripheral configurators, BSPs, and CAPSENSE™ middleware; PSoC™ Creator enables schematic-driven hardware design with automatic routing. MiniProg4 is the recommended programmer/debugger.

Does CY8C4025LQI-S401 support hardware-accelerated encryption?

No. CY8C4025LQI-S401 does not include dedicated cryptographic accelerators or TRNG. It relies on software-based AES or SHA implementations. For secure boot or data encryption, designers must implement lightweight libraries or select higher-tier PSoC™ 4 or PSoC™ 6 devices with dedicated security blocks.

Can the CAPSENSE™ block operate during Deep Sleep mode?

Yes. The CAPSENSE™ sigma-delta sensing engine remains active in Deep Sleep mode with 2.5 µA system current. It can generate wake-up interrupts on touch events, enabling true ultra-low-power touch wake capability without CPU intervention.

Is an external crystal required for accurate real-time clock operation?

Not required, but recommended. The device includes a ±2% internal IMO and a 32 kHz ILO for basic timing. For RTC-grade accuracy (<±50 ppm), the optional 32.768 kHz WCO must be populated. The WCO is supported in this package and connects to dedicated XIN/XOUT pins.