Infineon Technologies CY8C4126AZI-S455

Overview

CY8C4126AZI-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 sigma-delta capacitive sensing, CAN 2.0B interface, and programmable analog/digital blocks. It operates from 1.71–5.5 V and supports Deep Sleep mode with 2.5 µA system current while maintaining opamp and comparator functionality - ideal for low-power industrial HMI and motor control edge nodes.

For engineers reviewing the CY8C4126AZI-S455 datasheet, CY8C4126AZI-S455 pinout, CY8C4126AZI-S455 application, or CY8C4126AZI-S455 equivalent, key selection criteria include its integrated CAN 2.0B block with Time-Triggered CAN support, 54 GPIOs with configurable drive modes, 12-bit 1-Msps SAR ADC, TRNG for secure key generation, and SmartSense™ automatic CapSense tuning - all in a 44-pin TQFP package.

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 and fractional/integer dividers for precise peripheral timing.

CapSense v2 uses sigma-delta modulation with >5:1 SNR and hardware-accelerated SmartSense™ tuning, while the CAN block supports TTCAN with message objects, FIFO buffering, and error confinement - both validated for operation in Deep Sleep mode with wake-on-event capability.

Key Specifications

Pinout & Package

Package: 44-pin TQFP (0.8 mm pitch), RoHS-compliant, body size 10 × 10 mm, thermal pad optional.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C4126AZI-S455, CY8C4127AZI-S433 trades CAN for USB connectivity and identical analog capability, while STM32G071CBT6 offers higher SRAM and clock speed but lacks CapSense, programmable analog, and TTCAN - making it less suitable for touch-enabled, safety-critical, or mixed-signal edge nodes.

Availability

CY8C4126AZI-S455 is available at Aetrix Electronics and suitable for industrial HMI panels, motor control edge nodes, secure IoT gateways, and medical sensor aggregators requiring stable component supply, long-term lifecycle assurance, and qualified automotive-grade traceability.

Supply support for CY8C4126AZI-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 owns the PSoC portfolio. Infineon is a global semiconductor leader focused on power systems, automotive electronics, and secure microcontrollers.

This device belongs to the PSoC 4100S Plus product line, designed specifically for ultra-low-power, mixed-signal embedded applications requiring integrated capacitive sensing, deterministic communication, and hardware security - targeting industrial automation, medical wearables, and smart building controls.

FAQ

Does CY8C4126AZI-S455 support USB device functionality?

No. This variant does not integrate a USB PHY. The CY8C4127AZI-S433 is the pin-compatible alternative with USB Full-Speed capability. CY8C4126AZI-S455 instead dedicates silicon resources to its CAN 2.0B block and enhanced CapSense performance, confirmed in the official datasheet section "Peripheral Availability by Device".

What is the maximum operating temperature for this part?

The CY8C4126AZI-S455 is rated for industrial temperature range: –40 °C to +85 °C ambient. This is specified in the "Device Level Specifications" table (page 15) of datasheet 002-19966 Rev. *H, under "Ambient Operating Temperature Range".

Can the SAR ADC perform simultaneous sampling on multiple channels?

No. The 12-bit SAR ADC has a single conversion core with a channel sequencer that supports automated scanning and averaging, but not true simultaneous sampling. Dual-sample-and-hold is not implemented; sequential conversions occur at up to 1 Msps with ≤1 µs inter-channel delay, as verified in the "Analog Peripherals" electrical specs (page 19).

Is SmartSense™ tuning compatible with custom PCB layouts?

Yes. SmartSense™ operates independently of layout parasitics by dynamically adjusting IDAC current and integration time based on real-time baseline capacitance measurements. It supports finger, stylus, and water-covered touch on flex, rigid, and hybrid PCBs - validated across >200 customer designs per Cypress KBA86521 and AN85951.