Infineon Technologies CY8C4025LQI-S401T

Overview

CY8C4025LQI-S401T from Infineon is a 32-bit Arm® Cortex®-M0+ microcontroller with 48 MHz CPU, 32 KB flash, 4 KB SRAM, integrated CAPSENSE™ capacitive sensing, two SCBs supporting I²C/SPI/UART, and five 16-bit TCPWM blocks. It operates from 1.71 V to 5.5 V and supports Deep Sleep mode at 2.5 µA system current. Used in touch-enabled industrial HMI and smart sensor nodes requiring low-power, reconfigurable analog/digital logic.

For engineers reviewing the CY8C4025LQI-S401T datasheet, CY8C4025LQI-S401T pinout, CY8C4025LQI-S401T application, or CY8C4025LQI-S401T equivalent, key selection criteria include CAPSENSE™ SNR (>5:1), programmable analog blocks (IDACs, comparators), TCPWM kill-signal triggering for motor control, and SWD debug compatibility with industry-standard tools.

Technical Context

The device implements a single-layer AHB-Lite interconnect linking the Cortex®-M0+ core, memory subsystem (32 KB flash + 4 KB SRAM), and peripherals including two serial communication blocks (SCBs) and five timer/counter/PWM (TCPWM) modules. Clock sources include a ±2% IMO, 32 kHz WCO, and 32 kHz ILO for precise timing across power modes.

Analog functionality centers on CAPSENSE™ v2 sigma-delta sensing with hardware SmartSense tuning, two low-power comparators active in Deep Sleep, and two current DACs usable on any GPIO. Digital reconfigurability is enabled via programmable logic blocks and flexible GPIO routing through the IOSS matrix.

Key Specifications

Pinout & Package

Package: 40-pin QFN (7 mm × 7 mm, 0.5 mm pitch), exposed thermal pad, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C4025LQI-S401T, the S412 offers identical functionality in a larger TQFP package with inferior thermal and RF performance, while the STM32G031 lacks hardware-accelerated capacitive sensing - making the CY8C4025LQI-S401T uniquely suitable for robust, low-power touch interfaces where analog integration reduces design risk.

Availability

CY8C4025LQI-S401T is available at Aetrix Electronics and suitable for industrial HMI, smart sensor nodes, motor control interfaces, and medical front panels requiring stable component supply and long-term lifecycle support.

Supply support for CY8C4025LQI-S401T 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 controllers, with global R&D and manufacturing infrastructure.

The PSoC™ 4000S product line targets cost-sensitive, low-power embedded systems requiring integrated analog sensing, reconfigurable logic, and touch UI - designed to replace multi-chip solutions in industrial and consumer edge devices.

FAQ

Does CY8C4025LQI-S401T support USB communication?

No. This device lacks a dedicated USB PHY or controller. Communication is limited to the two SCBs configured as I²C, SPI, or UART. For USB connectivity, external bridge ICs (e.g., CP2102N) or migration to PSoC™ 4100S/4200S families with USBFS are required.

What is the maximum operating temperature for continuous Deep Sleep mode?

The device is rated for industrial temperature range (–40 °C to +85 °C). Deep Sleep current remains within specification up to +85 °C ambient, verified per datasheet Section 6.2 - no derating required for thermal management in sealed enclosures.

Can CAPSENSE™ electrodes be routed over ground planes without performance loss?

Yes, but with constraints: traces must be shielded by guard rings driven by CAPSENSE™ shield output, and keep-out zones ≥2× trace width must be maintained around electrodes. Layout guidelines in AN85951 specify minimum spacing and layer stackup rules for optimal SNR.

Is SWD debug supported in all power modes?

SWD is fully operational in Active and Sleep modes. In Deep Sleep, SWD clocks are gated and debug access is disabled unless wake-up events (e.g., GPIO interrupt or comparator output) first transition the device to Sleep mode, where SWD resumes within 1 µs.