Infineon Technologies CY8C4127AZI-S455

Overview

CY8C4127AZI-S455 from Infineon Technologies (acquired Cypress Semiconductor) is a PSoC 4100S Plus programmable system-on-chip featuring a 48-MHz Arm Cortex-M0+ CPU, 128 KB flash, 16 KB SRAM, integrated CapSense® capacitive sensing, CAN 2.0B interface, and programmable analog/digital blocks. It supports deep-sleep operation at 2.5 µA with active opamps and is qualified for industrial applications in 48-pin TQFP (0.5-mm pitch) package.

For engineers reviewing the CY8C4127AZI-S455 datasheet, CY8C4127AZI-S455 pinout, CY8C4127AZI-S455 application, or CY8C4127AZI-S455 equivalent, key selection criteria include its integrated CAN 2.0B block with TTCAN support, 12-bit 1-Msps SAR ADC with sequencer, dual opamps operable in Deep Sleep, SmartSense™ auto-tuning for CapSense, and SWD debug interface with flash protection.

Technical Context

The device implements a tightly coupled MCU subsystem with 8-channel DMA, NVIC, and WIC for low-latency wake-up from Deep Sleep. Its clock architecture integrates IMO (±2%), ILO (32 kHz), WCO, ECO (4–33 MHz), and PLL to generate stable 48-MHz HFCLK with fractional/integer dividers for peripheral synchronization.

Analog resources include two reconfigurable opamps (buffer/comparator/ADC input modes), a 12-bit SAR ADC with differential/single-ended inputs and hardware averaging, two IDACs, and two low-power comparators - all functional in Deep Sleep. Digital flexibility comes from five reconfigurable SCBs (I²C/SPI/UART), eight TCPWM blocks with quadrature decode and kill-signal triggering, and programmable logic blocks for Boolean port-level operations.

Key Specifications

Pinout & Package

Package: 48-pin TQFP (0.5-mm pitch), RoHS-compliant, industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable SoC applications.

Compared with CY8C4127LQI-S433 and STM32G071CBT6, CY8C4127AZI-S455 uniquely combines CAN 2.0B with hardware-accelerated CapSense and reconfigurable analog blocks in a single die - reducing system complexity for industrial HMI and distributed control nodes where mixed-signal integration and deterministic networking are critical.

Availability

CY8C4127AZI-S455 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, smart home sensor hubs, and medical wearable monitors requiring stable component supply and long-term lifecycle support.

Supply support for CY8C4127AZI-S455 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 portfolio, delivering scalable programmable SoCs for embedded control and human-machine interface applications.

CY8C4127AZI-S455 belongs to the PSoC 4100S Plus product line, designed specifically for cost-sensitive, low-power industrial and automotive applications requiring integrated capacitive sensing, deterministic CAN communication, and flexible analog-digital reconfiguration without external components.

FAQ

What debug interface does CY8C4127AZI-S455 use, and how is security enforced?

CY8C4127AZI-S455 uses Arm Serial-Wire Debug (SWD) with four breakpoint and two watchpoint comparators. Debug features are enabled by default but can be disabled in firmware; re-enabling requires full flash erase and clearing of flash protection - preventing unauthorized access to firmware or IP in deployed units.

Does CY8C4127AZI-S455 support true hardware random number generation?

Yes - it integrates a True Random Number Generator (TRNG) compliant with NIST SP 800-90B, producing entropy from analog noise sources. The TRNG output feeds cryptographic key generation routines in the ROM bootloader and supports secure boot and AES key derivation in user firmware.

Can the opamps operate during Deep Sleep mode, and what configurations are supported?

Yes - both opamps remain fully functional in Deep Sleep mode. They support buffer, comparator, and ADC input buffering configurations. Each opamp's power mode, gain, and output drive strength are independently configurable via registers accessible in low-power states.

How many serial communication interfaces can run simultaneously, and what protocols are supported?

Five Serial Communication Blocks (SCBs) operate concurrently. Each SCB is software-reconfigurable at runtime as I²C master/slave, SPI master/slave, or UART - enabling simultaneous use of different protocols (e.g., I²C for sensors, SPI for display, UART for diagnostics, CAN for network, and second I²C for EEPROM).