Infineon Technologies CY8C4125LQS-S433

Overview

CY8C4125LQS-S433 from Infineon is an AEC-Q100 Grade 2 (–40°C to +105°C) automotive-grade PSoC™ 4100S microcontroller featuring a 48 MHz Arm® Cortex®-M0+ CPU, 64 KB flash, 8 KB SRAM, integrated CAPSENSE™ capacitive sensing with >5:1 SNR, and three reconfigurable serial communication blocks (I²C/SPI/UART/LIN). It targets body control modules and touch-enabled automotive HMI systems.

For engineers reviewing the CY8C4125LQS-S433 datasheet, CY8C4125LQS-S433 pinout, CY8C4125LQS-S433 application, or CY8C4125LQS-S433 equivalent, key selection criteria include AEC-Q100 S-grade qualification, Deep Sleep current of 2.5 µA, 12-bit 1-Msps SAR ADC with sequencer, programmable analog CTB opamps with low-power operation, and TCPWM blocks supporting comparator-triggered Kill signals for motor safety.

Technical Context

The device implements a mixed-signal SoC architecture integrating fixed-function peripherals (TCPWM, SCB, WCO) with configurable analog (CTB, SAR ADC, IDAC, LPC) and digital (PLD, UDB) resources routed via a programmable interconnect matrix. Its CAPSENSE™ CSD engine delivers hardware-accelerated sigma-delta sensing with automatic tuning and water tolerance.

Power management includes five operational modes (Active, Sleep, Deep Sleep, Hibernate, Off), with Deep Sleep sustaining opamp and comparator functionality at 2.5 µA system current. Clocking supports IMO (48 MHz), ILO (32.768 kHz), and external crystal (WCO up to 32.768 kHz) sources, enabling precise timing for LIN slave and PWM synchronization.

Key Specifications

Pinout & Package

Package: 40-pin QFN (6 × 6 mm, 0.5 mm pitch), thermally enhanced with exposed pad. Pin mapping validated per Infineon datasheet 002-15106 Rev. *L Section 2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive microcontroller applications.

Compared with STM32G431KB6 and RA4M2, CY8C4125LQS-S433 uniquely integrates AEC-Q100-qualified CAPSENSE™ CSD hardware, enabling lower system-level BOM cost, reduced PCB area, and faster time-to-certification for touch-based automotive HMI.

Availability

CY8C4125LQS-S433 is available at Aetrix Electronics and suitable for automotive body electronics, touch-based human-machine interfaces, and LIN-connected sensor hubs requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CY8C4125LQS-S433 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 AG is a German semiconductor manufacturer specializing in power management, automotive MCUs, and security solutions, with global R&D centers and ISO/TS 16949-certified manufacturing.

CY8C4125LQS-S433 belongs to the PSoC™ Automotive 4100S product line, designed specifically for AEC-Q100-compliant automotive body electronics requiring integrated analog sensing, capacitive touch, and LIN connectivity in compact form factors.

FAQ

What is the maximum operating frequency of the Arm® Cortex®-M0+ core in CY8C4125LQS-S433?

The Arm® Cortex®-M0+ CPU operates at a maximum frequency of 48 MHz, derived from the internal main oscillator (IMO) with optional PLL multiplication. This frequency is fully supported across the full –40°C to +105°C temperature range and 1.71–5.5 V supply voltage, meeting AEC-Q100 Grade 2 timing requirements without derating.

Does CY8C4125LQS-S433 support LIN 2.2 physical layer compliance?

CY8C4125LQS-S433 implements LIN 2.2 protocol compliance in slave mode via its Serial Communication Block (SCB), including automatic header detection, checksum verification, and ±1.5% baud rate tolerance. It does not integrate the LIN transceiver PHY; an external compliant transceiver (e.g., TLE7259-3GE) is required for physical layer signaling.

Can the CAPSENSE™ subsystem operate during Deep Sleep mode?

Yes - the CAPSENSE™ CSD hardware engine remains fully functional in Deep Sleep mode with 2.5 µA system current. It supports autonomous scan initiation via dedicated wakeup sources (e.g., timer, GPIO interrupt), and reports results to SRAM upon wake, enabling true low-power touch wake-on-event operation without CPU involvement.

What debug interface does CY8C4125LQS-S433 provide, and is it accessible in production units?

CY8C4125LQS-S433 uses ARM Serial Wire Debug (SWD) via SWDCK and SWDIO pins. The debug interface remains enabled in production firmware unless explicitly disabled via the "Secure Boot" configuration bit. Even when secured, SWD supports authenticated firmware updates and limited trace capabilities per Infineon's Secure Programming Guidelines.