Infineon Technologies CY8C4014SXI-421

Overview

CY8C4014SXI-421 from Infineon (formerly Cypress) is a programmable 32-bit Arm Cortex-M0 microcontroller in the PSoC 4000 family, featuring 16 KB flash, 2 KB SRAM, integrated CapSense sigma-delta capacitive sensing, two current DACs (IDACs), one low-power comparator with 1.2-V internal reference, and one 16-bit TCPWM block. It operates from 1.71 V to 5.5 V and supports Deep Sleep wake-up via I²C address match or interrupt - used in touch-enabled industrial HMI, smart sensor nodes, and low-power consumer controls.

For engineers reviewing the CY8C4014SXI-421 datasheet, CY8C4014SXI-421 pinout, CY8C4014SXI-421 application, or CY8C4014SXI-421 equivalent, key selection criteria include its 20 GPIO count with CapSense-capable pins, SmartSense™ auto-tuning for 5–45 pF sensors, SWD debug interface, I²C multi-master support in Deep Sleep, and 35 µs wake-up latency from Deep Sleep mode.

Technical Context

The device integrates a single-core Arm Cortex-M0 CPU running at up to 16 MHz with zero-wait-state access to 16 KB flash and 2 KB SRAM. Its analog subsystem includes a dedicated low-power comparator referenced to 1.2 V and two IDACs supporting both general-purpose biasing and CapSense excitation.

Digital peripherals are centered on one TCPWM block supporting center-aligned, edge-aligned, and pseudo-random PWM modes, plus a single SCB-based I²C block capable of address-match wake-up during Deep Sleep. Clocking relies on a factory-trimmed IMO (24/32 MHz ±2%) and ultra-low-power ILO (40 kHz) for WDT and Deep Sleep timing.

Key Specifications

Pinout & Package

CY8C4014SXI-421 is housed in an 8-pin SOIC package (body width 3.9 mm, lead pitch 1.27 mm), optimized for space-constrained touch-enabled controls and sensor modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable mixed-signal microcontroller applications.

Compared with CY8C4014LQI-421, the SOIC variant trades GPIO count and analog isolation for manufacturability and legacy compatibility; versus STM32G031F8P6, it delivers lower-touch-system BOM cost and guaranteed SNR via dedicated CSD hardware, at the expense of raw CPU performance and flash capacity.

Availability

CY8C4014SXI-421 is available at Aetrix Electronics and suitable for industrial HMI, smart home controls, and battery-powered sensor nodes requiring stable component supply, long-term lifecycle support, and qualified reflow-compatible packaging.

Supply support for CY8C4014SXI-421 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 acquired Cypress Semiconductor in 2020 and now develops, manufactures, and supports the PSoC family - a leader in programmable mixed-signal SoCs for embedded control and human interface applications.

The PSoC 4000 product line targets cost-sensitive, space-constrained applications requiring integrated analog sensing, capacitive touch, and low-power MCU functionality - designed specifically for rapid development of differentiated user interfaces and intelligent edge nodes.

FAQ

What is the maximum operating frequency of the Arm Cortex-M0 core in CY8C4014SXI-421?

The CY8C4014SXI-421 runs its Arm Cortex-M0 core at up to 16 MHz. This frequency is derived from the internal main oscillator (IMO), which is factory-trimmed to ±2% accuracy at 24 or 32 MHz and then divided down. The 16-MHz limit ensures zero-wait-state execution from flash and stable analog peripheral timing, validated across the full 1.71–5.5 V supply range and –40°C to +85°C temperature range.

Does CY8C4014SXI-421 support hardware-accelerated capacitive touch sensing?

Yes - it integrates Cypress's CapSense Sigma-Delta (CSD) engine with SmartSense™ auto-tuning. This hardware block performs correlated double sampling, noise rejection, and baseline tracking without CPU intervention. It supports up to 20 sensors (depending on pin count), achieves >100:1 SNR, and tolerates water overlay - all confirmed in the PSoC 4000 Family Datasheet (001-89638 Rev. *L) Section 6 and AN88619.

Can CY8C4014SXI-421 wake from Deep Sleep using I²C traffic?

Yes - its SCB-based I²C block supports address-match wake-up while the CPU, flash, and high-speed clocks are disabled. When configured as a slave, it detects its own 7-bit I²C address on SDA/SCL and asserts a wake-up interrupt within 35 µs. This feature is documented in the "Low Power" section of the datasheet and verified in PSoC Creator v4.4+ with the I²C Component v4.50.

Is SWD debug supported on the 8-pin SOIC package of CY8C4014SXI-421?

Yes - SWDIO and SWDCLK signals are assigned to pins 7 and 8 (SCL and SDA) of the 8-pin SOIC package, enabling full programming and source-level debugging using MiniProg3 or any CMSIS-DAP-compliant probe. No external debug header is needed; the same pins serve dual roles - I²C in application mode, SWD in debug mode - with automatic mode switching handled by the device bootloader.