Infineon Technologies CY8C4745LQI-S401

Overview

CY8C4745LQI-S401 from Infineon Technologies (formerly Cypress Semiconductor) is a programmable 32-bit Arm Cortex-M0+ microcontroller in the PSoC 4700S family, integrating MagSense™ inductive sensing and CapSense® capacitive sensing on a single die. It features 48 MHz CPU, 32 KB flash, 4 KB SRAM, up to 16 inductive sensors, and dual reconfigurable SCBs supporting I²C/SPI/UART. It targets metal proximity detection in industrial HMI and touchless control systems.

For engineers reviewing the CY8C4745LQI-S401 datasheet, CY8C4745LQI-S401 pinout, CY8C4745LQI-S401 application, or CY8C4745LQI-S401 equivalent, key selection criteria include its integrated MagSense capability for sub-190 nm metal deflection detection, CapSense Sigma-Delta SNR >5:1 with water tolerance, Deep Sleep current of 2.5 µA, and support for SmartIO Boolean logic on GPIOs.

Technical Context

The device implements a single-layer AHB-Lite interconnect between the Cortex-M0+ core and peripherals including two SCBs, five TCPWM blocks, and dedicated MagSense/CapSense hardware engines. Its clock system combines IMO (24–48 MHz, ±2%), ILO (40 kHz), and WCO (32 kHz) with fractional dividers for precise UART baud rate generation and low-jitter timing.

Analog subsystem includes one 10-bit single-slope ADC, two programmable IDACs (±5% reference), and two low-power comparators operational in Deep Sleep mode. Digital routing uses a high-speed I/O matrix enabling any GPIO to serve analog, digital, or sensing roles - up to 36 pins with configurable drive strength, slew rate, and interrupt capability.

Key Specifications

Pinout & Package

CY8C4745LQI-S401 is housed in a 48-pin TQFP (7 mm × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are fully reconfigurable via PSoC Creator; no fixed peripheral-to-pin mapping exists. All GPIOs support capacitive sensing, up to 16 support inductive sensing, and any pin may be assigned analog input, digital I/O, or SCB interface role.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C4745LQI-S401, the S411 variant adds extended temperature and ESD robustness for harsh environments, while the AZI-S401 offers identical functionality in a smaller QFN footprint - both retain full MagSense/CapSense feature parity and PSoC Creator compatibility.

Availability

CY8C4745LQI-S401 is available at Aetrix Electronics and suitable for industrial HMI, medical device controls, automotive proximity sensing, and smart home appliance designs requiring stable component supply and long-term lifecycle support.

Supply support for CY8C4745LQI-S401 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 is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, sensing, and microcontroller solutions for industrial, automotive, and IoT applications.

This device belongs to the PSoC 4700S product line, engineered specifically to unify inductive and capacitive sensing in a single low-power MCU - targeting next-generation touchless human-machine interfaces where reliability, integration, and environmental resilience are critical.

FAQ

Does CY8C4745LQI-S401 require external crystal oscillators for basic operation?

No. The device operates from its internal main oscillator (IMO), factory-trimmed to ±2% accuracy at 24–48 MHz. A 32 kHz watch crystal (WCO) is optional and only needed for high-precision real-time clock or watchdog timer applications. All core MCU and sensing functions run without external crystals.

Can MagSense and CapSense operate simultaneously on the same GPIO pin?

No. While any GPIO can be assigned to either MagSense or CapSense, the two sensing modalities use mutually exclusive analog resources - MagSense requires dedicated inductor drive circuitry and demodulation paths, whereas CapSense relies on sigma-delta modulation and shield drivers. Pins must be statically allocated per sensing type in PSoC Creator.

What debug interface does CY8C4745LQI-S401 support, and is it accessible in all power modes?

It supports Serial Wire Debug (SWD) via SWDCK and SWDIO pins. Debug access is available in Active and Sleep modes but disabled in Deep Sleep mode to preserve ultra-low current. Breakpoint and watchpoint debugging is fully supported during development, and SWD remains functional after flash programming and secure boot configuration.

Is PSoC Creator the only supported IDE, or can third-party tools like Keil or IAR be used?

PSoC Creator is the primary and officially supported IDE for hardware configuration, component placement, and automatic routing. However, generated projects export standard ARM GCC/ARMCC-compatible source code and linker scripts, enabling compilation and debugging in Keil µVision, IAR Embedded Workbench, or Arm GNU Toolchain - provided the PSoC 4 HAL and startup files are included.