Infineon Technologies CY8C4127AZI-S453

Overview

CY8C4127AZI-S453 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 mode at 2.5 µA, operates from 1.71–5.5 V, and targets embedded human-interface and industrial control applications requiring mixed-signal integration and low-power operation.

For engineers reviewing the CY8C4127AZI-S453 datasheet, CY8C4127AZI-S453 pinout, CY8C4127AZI-S453 application, or CY8C4127AZI-S453 equivalent, key selection criteria include its 54 GPIO count with CapSense capability on any pin, CAN 2.0B block with TTCAN support, 12-bit 1-Msps SAR ADC, dual opamps operational in Deep Sleep, and TRNG for cryptographic key generation.

Technical Context

The CY8C4127AZI-S453 implements a tightly coupled MCU subsystem with Arm Cortex-M0+ core, single-cycle multiply, and 8-channel DMA, paired with a flexible interconnect fabric enabling concurrent analog/digital routing. Its clock architecture integrates IMO (±2%), ILO (32 kHz), WCO, ECO (4–33 MHz), and PLL to generate precise 48-MHz system clock with glitch-free switching.

Analog functionality includes two reconfigurable opamps (buffering, comparator, high-drive modes), a 12-bit SAR ADC with channel sequencer and averaging, two IDACs, and two low-power comparators-all operable in Deep Sleep. Digital resources comprise five reconfigurable SCBs (I²C/SPI/UART), eight TCPWM blocks with quadrature decode and kill-signal triggering, and programmable logic blocks supporting Boolean operations on GPIOs.

Key Specifications

Pinout & Package

The CY8C4127AZI-S453 is housed in a 64-pin TQFP package with 0.5-mm pitch, RoHS-compliant, and thermally enhanced for industrial ambient conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32G474RET6 and RP2040, CY8C4127AZI-S453 uniquely combines CapSense, CAN 2.0B with TTCAN, Deep Sleep analog operation, and TRNG in a single die-making it optimal for secure, low-power, touch-and-communication–intensive embedded systems where component count and certification effort must be minimized.

Availability

CY8C4127AZI-S453 is available at Aetrix Electronics and suitable for industrial HMI panels, automotive body controllers, smart home thermostats, and portable medical monitors requiring stable component supply across multi-year production cycles.

Supply support for CY8C4127AZI-S453 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 portfolio. Infineon is a global semiconductor leader focused on power systems, automotive, and industrial applications.

The CY8C4127AZI-S453 belongs to the PSoC 4100S Plus product line, designed specifically for secure, low-power, mixed-signal embedded systems requiring integrated capacitive sensing, CAN communication, and programmable analog/digital logic in resource-constrained environments.

FAQ

What development tools are required to program and debug CY8C4127AZI-S453?

PSoC Creator IDE (free, Windows-only) is the primary development environment, providing schematic-based design entry, automatic peripheral routing, and integrated debugging via SWD. The MiniProg3 programmer/debugger is required for flash programming and real-time debugging. Third-party Arm tools (Keil MDK, IAR Embedded Workbench) are supported after project export, but PSoC Creator remains necessary for initial hardware configuration and component placement.

Does CY8C4127AZI-S453 support hardware encryption or secure boot?

CY8C4127AZI-S453 includes a True Random Number Generator (TRNG) compliant with NIST SP 800-90B for cryptographic key generation, and flash protection mechanisms that prevent unauthorized read/write access. However, it does not integrate AES or SHA accelerators, nor does it support signed secure boot. Secure boot must be implemented in firmware using keys generated by the TRNG and stored in protected flash regions.

Can all 54 GPIO pins be used simultaneously for CapSense?

No. While any GPIO pin can be configured for CapSense, the maximum number of simultaneous CapSense sensors is limited by the CSD block's hardware resources: up to 32 self-capacitive or 16 mutual-capacitive sensors per device. Using more than this requires time-multiplexing or external scanning, which increases scan time and reduces SNR. Pin count does not equal concurrent sensor count due to shared analog routing and CTBm block constraints.

What is the minimum supply voltage for CAN operation?

CAN transceiver functionality requires VDD ≥ 3.0 V to ensure proper differential signaling levels and bus fault tolerance per ISO 11898-2. Below 3.0 V, the CAN block remains powered but cannot drive the bus correctly; attempted transmission may result in non-compliant dominant/recessive states and bus errors. The device itself operates down to 1.71 V, but CAN operation is only guaranteed within the 3.0–5.5 V range specified in the electrical characteristics table.