Infineon Technologies CY8C4024LQI-S412

Overview

CY8C4024LQI-S412 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 system current, and delivers best-in-class SNR (>5:1) for water-tolerant touch interfaces in consumer and industrial HMI applications.

For engineers reviewing the CY8C4024LQI-S412 datasheet, CY8C4024LQI-S412 pinout, CY8C4024LQI-S412 application, or CY8C4024LQI-S412 equivalent, key selection criteria include its 48-MHz CPU performance, dual SCB blocks supporting I²C/SPI/UART reconfiguration, five TCPWM modules with comparator-triggered kill signals, and programmable analog blocks including two IDACs and two low-power comparators.

Technical Context

The device integrates a single-cycle multiply Arm® Cortex®-M0+ core running at up to 48 MHz, coupled with a flexible digital fabric of programmable logic blocks (PLBs) and fixed-function peripherals including TCPWM, SCB, and CAPSENSE™ v2 sigma-delta engine. Its analog subsystem includes a capacitance-sensing ADC, two current DACs, and two comparators that remain active in Deep Sleep mode.

System-level timing is managed by multiple clock sources: ±2% IMO, 32-kHz WCO, and 32-kHz ILO. The device uses a single-layer AHB interconnect and supports SWD debug without external pods, enabling full on-chip firmware and hardware co-debugging in production systems.

Key Specifications

Pinout & Package

CY8C4024LQI-S412 is housed in a 40-pin QFN package (6 × 6 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are fully configurable via PSoC™ Creator or ModusToolbox™, and alternate functions are mapped per GPIO port (P0–P4).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C4024LQI-S412, the S402 offers cost-optimized memory for basic touch control, while the S412 variant provides headroom for feature-rich HMI with protocol flexibility and extended timing control - both share identical pinout, power behavior, and CAPSENSE™ performance.

Availability

CY8C4024LQI-S412 is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMI terminals, medical device keypads, and smart lighting control modules requiring stable component supply, long lifecycle support, and qualified automotive-grade traceability.

Supply support for CY8C4024LQI-S412 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 manufacturing and quality certification to ISO/TS 16949 and IATF 16949.

CY8C4024LQI-S412 belongs to the PSoC™ 4000S product line, designed specifically for cost-sensitive, low-power human-machine interface applications requiring robust capacitive sensing, flexible connectivity, and rapid prototyping with ModusToolbox™ or PSoC™ Creator.

FAQ

Does CY8C4024LQI-S412 support Bluetooth Low Energy?

No, CY8C4024LQI-S412 does not integrate a BLE radio. It can interface externally with BLE modules (e.g., CYBLE-416045-02) via its two SCB blocks configured as UART or SPI. BLE stack execution requires external host or companion SoC, as the device lacks RF transceiver hardware and dedicated BLE firmware memory space.

What development tools are officially supported for this MCU?

Infineon officially supports PSoC™ Creator (Windows-only, legacy schematic-based IDE) and ModusToolbox™ (cross-platform, Eclipse-based with CLI tools). Both provide full peripheral configuration, CAPSENSE™ tuning utilities, TCPWM code generation, and SWD debugging. MiniProg4 is the recommended programmer/debugger for production programming and field firmware updates.

Can all GPIO pins be used simultaneously for CAPSENSE™ and analog measurement?

Yes, all 36 GPIOs support CAPSENSE™ and analog functions, but resource sharing applies: only two IDACs and two comparators are available globally, and CAPSENSE™ sigma-delta conversion shares analog routing resources. Simultaneous high-speed analog acquisition and full-capacitance scanning require time-multiplexing or careful resource allocation in firmware.

Is the WCO (32 kHz crystal oscillator) mandatory for Deep Sleep operation?

No, the WCO is optional. The device can enter Deep Sleep using the 32 kHz internal low-power oscillator (ILO), which consumes less than 1 µA but has ±50% accuracy. WCO is required only when precise RTC timing, wake-up jitter < 100 µs, or synchronization with external 32.768 kHz clocks is needed.