Infineon Technologies CY8C4024LQI-S403T

Overview

CY8C4024LQI-S403T 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 - deployed in industrial HMI, consumer touch interfaces, and smart sensor nodes requiring low-power operation down to 2.5 µA in Deep Sleep mode.

For engineers reviewing the CY8C4024LQI-S403T datasheet, CY8C4024LQI-S403T pinout, CY8C4024LQI-S403T application, or CY8C4024LQI-S403T equivalent, key selection criteria include CAPSENSE™ SNR (>5:1), programmable analog (IDACs, comparators), reconfigurable digital logic, 1.71–5.5 V supply range, and WLCSP-25 package compatibility with high-density PCB layouts.

Technical Context

The device implements a single-layer AHB-Lite interconnect linking the Cortex-M0+ core, memory subsystem (32 KB flash + 4 KB SRAM + 8 KB ROM), and peripherals including two low-power comparators operating in Deep Sleep, a sigma-delta CAPSENSE™ v2 engine, and five TCPWM blocks supporting center-aligned PWM and comparator-triggered kill signals for motor control safety.

Its dual serial communication blocks (SCBs) are runtime-reconfigurable between I²C, SPI, and UART modes, while the I/O subsystem supports up to 36 GPIOs with programmable drive strength, slew rate, and CAPSENSE™/analog/digital multiplexing - all managed via SWD debug interface compliant with Arm serial-wire standard.

Key Specifications

Pinout & Package

Package: 25-ball WLCSP (Wafer-Level Chip Scale Package), 2.13 mm × 2.13 mm, 0.4 mm pitch, bottom-side solder balls - optimized for space-constrained portable and wearable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C4024LQI-S403T, CY8C4014LQI-S402 reduces memory and feature set for cost-sensitive volume production, while CY8C4127LQI-S433 adds integrated BLE and memory headroom at higher unit cost - both retain identical CAPSENSE™ performance and WLCSP footprint.

Availability

CY8C4024LQI-S403T is available at Aetrix Electronics and suitable for industrial HMI panels, smart home touch controls, and wearable health sensors requiring stable component supply, long-term lifecycle assurance, and consistent WLCSP-25 packaging.

Supply support for CY8C4024LQI-S403T 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 MCUs, and secure embedded solutions, with global R&D and manufacturing infrastructure.

The PSoC™ 4000S product line delivers programmable mixed-signal microcontrollers targeting cost-sensitive, space-constrained human interface and sensor-edge applications - emphasizing CAPSENSE™ robustness, low-power operation, and rapid prototyping via ModusToolbox™ and PSoC™ Creator.

FAQ

What debug interface does CY8C4024LQI-S403T support?

CY8C4024LQI-S403T uses Arm® Serial Wire Debug (SWD) with two pins: SWDIO and SWCLK. It supports full programming, real-time debugging, breakpoints, and trace without JTAG overhead. The debug circuitry is enabled by default but can be disabled in firmware for security-critical deployments.

Does CY8C4024LQI-S403T support LCD segment driving?

Yes - it provides LCD segment drive capability directly on GPIO pins, enabling simple character or icon displays without external LCD drivers. This feature is implemented in hardware and supported by PSoC™ Creator and ModusToolbox™ middleware libraries for rapid implementation.

Can CAPSENSE™ operate during Deep Sleep mode?

No - CAPSENSE™ sensing requires active CPU and clock resources. However, the two low-power comparators remain functional in Deep Sleep and can trigger wake-up events based on analog thresholds, enabling efficient touch wake-on-press architectures.

What clock sources are integrated on-chip?

CY8C4024LQI-S403T integrates three on-chip oscillators: a ±2% 48 MHz Internal Main Oscillator (IMO), a 32 kHz Internal Low-Power Oscillator (ILO), and supports an external 32 kHz Watch Crystal Oscillator (WCO). These enable precise timing for RTC, low-power wake-up, and high-speed CPU operation without external crystals in most use cases.