Infineon Technologies CY8C4014FNI-421AT

Overview

CY8C4014FNI-421AT from Infineon (formerly Cypress) is a programmable 32-bit Arm Cortex-M0 microcontroller in the PSoC 4000 family, integrating CapSense capacitive touch sensing, two current DACs (IDACs), one low-power comparator, one 16-bit TCPWM block, and up to 20 GPIOs. It operates from 1.71 V to 5.5 V, supports Deep Sleep wake-up via I²C address match or interrupt, and targets embedded human-interface applications requiring integrated analog + digital reconfigurability.

For engineers reviewing the CY8C4014FNI-421AT datasheet, CY8C4014FNI-421AT pinout, CY8C4014FNI-421AT application, or CY8C4014FNI-421AT equivalent, key selection criteria include its 16 MHz CPU speed, 16 KB flash/2 KB SRAM memory map, CapSense Sigma-Delta (CSD) architecture with SmartSense™ auto-tuning, I²C wake-on-address capability in Deep Sleep, and SSOP-28 package compatibility with Arduino-compatible shield headers.

Technical Context

The device implements a tightly coupled Arm Cortex-M0 core with nested vectored interrupt controller (NVIC) and Serial Wire Debug (SWD) interface, enabling full on-chip debugging without external pods. Its clock system combines a factory-trimmed 24 MHz internal main oscillator (IMO, ±2% accuracy) and a 40 kHz internal low-frequency oscillator (ILO) for Deep Sleep timing and watchdog operation.

Analog functionality centers on Cypress's CapSense CSD engine - supporting 5–45 pF sensor range with hardware-accelerated sigma-delta conversion - plus a single rail-to-rail comparator referenced to 1.2 V and two programmable IDACs (±5% reference accuracy) usable for touch sensing bias or analog output scaling.

Key Specifications

Pinout & Package

Package: 28-pin SSOP (Small Outline Integrated Circuit), 300 mil body width, 0.025 inch pitch, JEDEC MS-012AC compliant. Pinout validated per Cypress CY8C4014 Family Pin Configuration (Document 001-89638 Rev. *L, Page 7).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C4014LQI-422 and STM32G031F8P6, CY8C4014FNI-421AT uniquely delivers production-ready CapSense CSD with SmartSense™ auto-tuning in a pin-compatible SSOP-28 package, eliminating external touch components while maintaining debug visibility and low-power Deep Sleep wake-up via I²C.

Availability

CY8C4014FNI-421AT is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMI keypads, medical device touch interfaces, and consumer IoT remote controls requiring stable component supply, long-term lifecycle support, and qualified reflow profiles for SSOP-28 assembly.

Supply support for CY8C4014FNI-421AT 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 of programmable SoCs for embedded control and human-interface applications.

The PSoC 4000 product line was designed specifically for cost-sensitive, space-constrained embedded systems requiring integrated capacitive touch sensing, low-power operation, and rapid firmware development using PSoC Creator IDE - targeting appliances, industrial HMIs, and portable medical devices.

FAQ

What is the maximum operating frequency of the Arm Cortex-M0 core in CY8C4014FNI-421AT?

The CY8C4014FNI-421AT features an Arm Cortex-M0 CPU with a maximum operating frequency of 16 MHz. This is achieved using the internal main oscillator (IMO) trimmed to 24 MHz and divided by 1.5, or directly from a 16 MHz external crystal. The CPU executes Thumb-2 instructions with zero wait-state access to flash and SRAM at this speed, ensuring deterministic real-time response for CapSense and control tasks.

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

Yes. The device integrates Cypress's CapSense Sigma-Delta (CSD) engine with dedicated hardware for charge-transfer measurement, enabling self-capacitance and mutual-capacitance touch sensing using only PCB traces as electrodes. No external RC networks, op-amps, or dedicated touch ICs are required. SmartSense™ auto-tuning adjusts IDAC current and scan parameters dynamically across environmental variations.

Can CY8C4014FNI-421AT wake from Deep Sleep using I²C traffic alone?

Yes. Its SCB-I²C block remains powered in Deep Sleep and performs full 7-bit slave address matching on incoming traffic. When a match occurs, it asserts a wake-up signal to the CPU within 35 µs, allowing immediate firmware response without polling. This feature requires no external interrupt lines and supports multi-master bus topologies where the device acts as a peripheral node.

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

CY8C4014FNI-421AT uses the standard 2-wire Serial Wire Debug (SWD) interface, compatible with industry tools including MiniProg3, Segger J-Link, and CMSIS-DAP adapters. No special emulators or pods are needed - only SWDIO and SWCLK connections plus power and ground. Debug features include four hardware breakpoints, two watchpoints, and full memory/register access, all functional on unmodified production silicon.