Infineon Technologies CY8C4014FNI-421T

Overview

CY8C4014FNI-421T from Infineon Technologies (acquired Cypress Semiconductor) is a 32-bit programmable system-on-chip (PSoC® 4000 family) featuring an ARM Cortex-M0 CPU running at 16 MHz, 16 KB flash with Read Accelerator, 2 KB SRAM, one 16-bit TCPWM block, two current DACs (IDACs), and a low-power comparator - all in a 24-pin QFN package. It integrates CapSense® capacitive sensing, I²C communication, and Deep Sleep mode with 35 µs wake-up for ultra-low-power human-interface applications.

For engineers reviewing the CY8C4014FNI-421T datasheet, CY8C4014FNI-421T pinout, CY8C4014FNI-421T application, or CY8C4014FNI-421T equivalent, key selection criteria include its 1.71–5.5 V operating range, SmartSense™ auto-tuning for touch, SWD debug interface, I²C address-match wake-up in Deep Sleep, and GPIO programmability across Ports 0–2.

Technical Context

The device implements a tightly coupled ARM Cortex-M0 subsystem with NVIC (8 interrupts), WIC (Wakeup Interrupt Controller), and Serial Wire Debug (SWD) interface supporting four breakpoint and two watchpoint comparators. Its clock architecture combines a factory-trimmed IMO (24–48 MHz, ±2% accuracy) and ultra-low-power ILO (40 kHz) to drive CPU, peripherals, and watchdog independently.

Analog resources include a 1.2-V referenced comparator usable for CapSense or general-purpose threshold detection, and two programmable IDACs (±5% reference accuracy) routed via amux buses to up to 16 GPIO pins. The TCPWM block supports center-aligned/edge-aligned PWM, capture, compare, and hardware-triggered kill signals for motor control safety.

Key Specifications

Pinout & Package

Package: 24-pin QFN (4 × 4 mm, 0.5 mm pitch), RoHS-compliant, exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F030F4P6 and MAX32620, CY8C4014FNI-421T uniquely delivers production-ready capacitive touch with zero-calibration deployment, hardware-accelerated analog routing, and Deep Sleep I²C wake-up - reducing firmware effort, validation time, and total system power in human-interface designs.

Availability

CY8C4014FNI-421T is available at Aetrix Electronics and suitable for touch-enabled consumer electronics, industrial HMI panels, and battery-powered sensor nodes requiring stable component supply, long-term lifecycle support, and consistent parametric performance across manufacturing lots.

Supply support for CY8C4014FNI-421T 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 owns the PSoC® platform. Infineon is a global semiconductor leader focused on power systems, automotive, and IoT solutions.

The PSoC 4000 product line was designed specifically for cost-optimized, ultra-low-power embedded applications requiring integrated analog, programmable logic, and capacitive touch - targeting smart appliances, wearables, and industrial controls where mixed-signal integration reduces system complexity.

FAQ

What is the maximum operating frequency of the ARM Cortex-M0 core in CY8C4014FNI-421T?

The CPU runs at a maximum of 16 MHz, derived from the internal main oscillator (IMO) which is factory-trimmed and adjustable from 24 to 48 MHz. A programmable clock divider scales IMO output to generate the 16-MHz FCPU signal, ensuring zero wait-state flash access and deterministic real-time execution.

Does CY8C4014FNI-421T support hardware-based capacitive touch without external components?

Yes - it integrates Cypress's Capacitive Sigma-Delta (CSD) engine with SmartSense™ auto-tuning, enabling production-ready touch buttons, sliders, and proximity sensing using only PCB traces and no external RC networks, op-amps, or calibration firmware.

Can the I²C interface wake the device from Deep Sleep mode?

Yes - the SCB-I²C block remains powered in Deep Sleep and can detect its configured 7-bit slave address on the bus, generating an interrupt that wakes the CPU within 35 µs. This enables ultra-low-power, always-on communication without periodic polling.

What debug interface does CY8C4014FNI-421T use, and is external hardware required?

It uses a 2-wire Serial Wire Debug (SWD) interface compliant with ARM standards. No external debug pods, emulators, or special connectors are needed - only SWDIO and SWCLK pins connected to a standard CMSIS-DAP or J-Link probe enable full programming, breakpoint debugging, and real-time trace in production hardware.