Infineon Technologies CY8C4045FNI-DS402T

Overview

CY8C4045FNI-DS402T from Infineon Technologies (formerly Cypress) is a PSoC 4200DS-series programmable system-on-chip featuring a 48 MHz Arm Cortex-M0 CPU, 32 kB flash, 4 kB SRAM, four UDBs, and three reconfigurable SCBs supporting I²C/SPI/UART. It operates from 1.71–5.5 V and delivers GPIO wakeup from Deep Sleep mode in compact 28-pin SSOP packaging - deployed in industrial sensor nodes and smart home edge controllers.

For engineers reviewing the CY8C4045FNI-DS402T datasheet, CY8C4045FNI-DS402T pinout, CY8C4045FNI-DS402T application, or CY8C4045FNI-DS402T equivalent, key selection criteria include its 21 programmable GPIOs with configurable drive strength, TCPWM-based motor control timing, SWD debug interface compatibility, and UDB-based logic reconfiguration for field-tunable signal conditioning.

Technical Context

The device integrates a single-layer AHB-Lite interconnect linking the Cortex-M0 core to memory, peripherals, and programmable digital blocks. Its clock architecture combines a factory-trimmed IMO (24–48 MHz, ±2%) and low-power ILO (40 kHz nominal), with six 16-bit dividers enabling precise peripheral clocking and fractional baud-rate generation for serial communication.

Debug and security are implemented via Serial Wire Debug (SWD) with four address breakpoints and two data watchpoints; debug can be disabled permanently via firmware, and all programming interfaces may be locked to prevent unauthorized reprogramming - critical for secure firmware updates in connected IoT endpoints.

Key Specifications

Pinout & Package

Package: 28-pin SSOP (0.635 mm pitch), 10.16 mm × 5.59 mm body size, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C4045LQI-DS402, the DS402T offers identical functionality in SSOP packaging for through-hole or legacy PCB assembly, while STM32G031K8T6 trades programmability for higher clock speed and memory - making it suitable only where UDB-based logic offload is unnecessary.

Availability

CY8C4045FNI-DS402T is available at Aetrix Electronics and suitable for industrial sensor nodes, smart home thermostats, motorized window shade controllers, and portable medical pulse oximeters requiring stable component supply across extended production lifecycles.

Supply support for CY8C4045FNI-DS402T 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, delivering power systems, microcontrollers, sensors, and security solutions for automotive, industrial, and IoT markets.

This part belongs to the PSoC 4200DS product line - designed specifically for cost-sensitive, low-power embedded applications requiring hardware programmability alongside Arm-based firmware execution, targeting rapid prototyping and field-upgradable edge intelligence.

FAQ

What development tools are supported for CY8C4045FNI-DS402T?

PSoC Creator IDE is the primary development environment, offering schematic-based hardware design, automatic routing, and pre-verified component libraries. It fully supports SWD debugging via MiniProg3 or KitProg2 programmers. ARM GCC toolchains and third-party IDEs like Keil MDK and IAR Embedded Workbench are also compatible after project export.

Does CY8C4045FNI-DS402T support capacitive sensing without external components?

Yes - it integrates a CapSense CSD block with dedicated hardware for self- and mutual-capacitance measurement. Up to 21 GPIOs can serve as sense electrodes, and built-in IDACs provide programmable current sources. No external RC networks or op-amps are required for basic touch button or slider implementation.

Can the UDBs implement custom communication protocols like 1-Wire or DALI?

Yes - UDBs support Verilog HDL entry and state machine synthesis. Cypress-provided components include 1-Wire master/slave implementations, and users have successfully deployed DALI, DMX512, and proprietary sensor protocols entirely within UDB fabric - verified in production designs with timing closure at 48 MHz.

Is there hardware support for cryptographic operations?

No dedicated crypto accelerator is present, but the device includes hardware TRNG (True Random Number Generator) and supports AES-128 encryption via optimized firmware libraries. Secure boot and flash protection prevent unauthorized code execution, though asymmetric cryptography (RSA/ECC) must be implemented in software with careful side-channel mitigation.