Infineon Technologies CY8C4126AXI-S453

Overview

CY8C4126AXI-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, and integrated CapSense® capacitive sensing with >5:1 SNR. It includes two opamps, a 12-bit 1-Msps SAR ADC, five reconfigurable SCB blocks (I²C/SPI/UART), eight TCPWM timers, CAN 2.0B with TTCAN support, and operates from 1.71–5.5 V in Deep Sleep at 2.5 µA - deployed in industrial HMI touch panels and smart sensor nodes.

For engineers reviewing the CY8C4126AXI-S453 datasheet, CY8C4126AXI-S453 pinout, CY8C4126AXI-S453 application, or CY8C4126AXI-S453 equivalent, key selection criteria include its programmable analog/digital fabric, CapSense sigma-delta engine, CAN 2.0B block with time-triggered capability, TRNG for secure key generation, and compatibility with PSoC Creator IDE for hardware/firmware co-design.

Technical Context

The device implements a single-layer AHB-Lite interconnect with dedicated peripheral interconnect (MMIO), enabling concurrent access to flash, SRAM, and peripherals without arbitration bottlenecks. Its clock architecture integrates IMO (±2%), ILO (32 kHz), WCO, ECO (4–33 MHz), and PLL to generate stable 48-MHz HFCLK with glitchless switching across 18 dividers - six supporting fractional division for precise peripheral timing.

Analog subsystem operation is decoupled from CPU activity: opamps and low-power comparators remain functional in Deep Sleep mode, while the SAR ADC supports differential acquisition, channel sequencing, and signal averaging - all synchronized via hardware triggers from TCPWM or SCB events, not software polling.

Key Specifications

Pinout & Package

Package: 44-pin TQFP (0.8 mm pitch), RoHS-compliant, body size 10 × 10 mm, thermal pad exposed on underside for enhanced heat dissipation in continuous motor-control operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32G071KB and MAX32660, CY8C4126AXI-S453 uniquely integrates CapSense, CAN 2.0B with TTCAN, and programmable analog blocks - enabling single-chip solutions for touch-enabled industrial controllers without external signal-conditioning ICs or CAN transceivers.

Availability

CY8C4126AXI-S453 is available at Aetrix Electronics and suitable for industrial HMI touch panels, smart motor drive controllers, and secure IoT sensor nodes requiring stable component supply, long-term lifecycle assurance, and qualified automotive-grade traceability.

Supply support for CY8C4126AXI-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 - a leader in programmable mixed-signal SoCs for embedded control and human-machine interface applications.

The PSoC 4100S Plus product line targets cost-sensitive, low-power industrial and consumer devices requiring integrated capacitive sensing, real-time control, and fieldbus connectivity - designed to replace multi-chip solutions with a single configurable die.

FAQ

What development tools are required to program CY8C4126AXI-S453?

PSoC Creator IDE (free Windows-based tool) is mandatory for schematic-driven hardware configuration and component-based firmware generation. It auto-generates initialization code, routing constraints, and API stubs. Programming is performed via MiniProg3 or KitProg2 debug probes using SWD interface - no external programmer required.

Does CY8C4126AXI-S453 support hardware-based AES encryption?

No - CY8C4126AXI-S453 does not include a dedicated AES accelerator. It provides a True Random Number Generator (TRNG) compliant with NIST SP 800-90B for secure key derivation, but cryptographic operations must be implemented in firmware using Cortex-M0+ instructions or third-party libraries.

Can all GPIO pins be used simultaneously for CapSense and analog measurement?

Yes - any of the up to 54 GPIO pins can be assigned to CapSense electrodes or analog inputs, but resource contention applies: SAR ADC uses shared analog MUX and reference voltage, while CapSense CSD engine uses dedicated sigma-delta modulator. Simultaneous high-speed ADC sampling and CapSense scanning require careful timing coordination via hardware triggers.

Is the CAN block compatible with ISO 11898-2 physical layer?

No - the CAN 2.0B block is a protocol controller only. It requires an external CAN transceiver (e.g., TJA1042T/3) to interface with ISO 11898-2 differential bus lines. The block supports TTCAN timing features including synchronization, offset correction, and schedule validation per ISO 11898-4.