Infineon Technologies CY8C4045FNI-DS400T

Overview

CY8C4045FNI-DS400T from Infineon Technologies (formerly Cypress) is a 32-bit programmable system-on-chip (PSoC® 4) microcontroller featuring an ARM® Cortex™-M0 CPU, 32 KB Flash, 4 KB SRAM, six 16-bit TCPWM blocks, two reconfigurable Serial Communication Blocks (SCB), and nine GPIO pins-including two overvoltage-tolerant I²C pins-packaged in a 1.63 mm × 2.03 mm, 20-ball WLCSP for ultra-compact USB Type-C port controller and embedded sensor interface applications.

For engineers reviewing the CY8C4045FNI-DS400T datasheet, CY8C4045FNI-DS400T pinout, CY8C4045FNI-DS400T application, or CY8C4045FNI-DS400T equivalent, key selection criteria include its 48-MHz operation, deep-sleep current of 2.5 µA, independent VDDIO (1.71–5.5 V) for mixed-voltage I/O, dual SCB flexibility (I²C/SPI/UART), and overvoltage-tolerant P0.0/P0.1 pins for robust USB-C CC line control.

Technical Context

The device implements a single-layer AHB-Lite interconnect linking the Cortex-M0 core to peripherals including flash with read accelerator, SRAM controller, ROM bootloader, and a high-speed I/O matrix enabling dynamic signal routing to GPIO. Clocking relies on a ±2% internal main oscillator (IMO, 24–48 MHz) and internal low-power oscillator (ILO), with eight configurable dividers supporting fractional and integer clock synthesis for peripheral timing.

Each of the six TCPWM blocks delivers timer, counter, PWM, and quadrature decoder functions with comparator-triggered kill signals for motor control safety; both SCBs support Fast Mode Plus I²C (1 Mbps), hardware arbitration, 8-deep FIFOs, and memory-mapped mailbox addressing-enabling deterministic communication without CPU polling overhead.

Key Specifications

Pinout & Package

Package: 20-ball wafer-level chip-scale package (WLCSP), 1.63 mm × 2.03 mm, 0.4-mm ball pitch, industrial temperature range (–40 °C to +85 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32G031F8P6 and RP2040, CY8C4045FNI-DS400T uniquely integrates overvoltage-tolerant I²C pins, independent VDDIO, and hardware I²C mailbox addressing-making it the only option among the three qualified for direct USB-C CC line control without external components.

Availability

CY8C4045FNI-DS400T is available at Aetrix Electronics and suitable for USB-C port controller designs, battery-powered sensor nodes, smart lighting modules, and medical wearable interfaces requiring stable component supply, long-term lifecycle assurance, and industrial temperature support.

Supply support for CY8C4045FNI-DS400T 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, automotive MCUs, and secure connectivity solutions with strong emphasis on industrial reliability and automotive qualification.

CY8C4045FNI-DS400T belongs to the PSoC® 4 family-designed specifically for cost-sensitive, space-constrained embedded systems requiring analog/digital programmability, ultra-low-power operation, and rapid prototyping via PSoC Creator IDE.

FAQ

What is the maximum operating frequency and how is it achieved?

The CY8C4045FNI-DS400T achieves a maximum CPU frequency of 48 MHz using its internal main oscillator (IMO), which is factory-trimmed to ±2% accuracy. This frequency is sustained with zero wait states for SRAM and one wait state for Flash-enabled by the integrated flash accelerator that delivers 85% of SRAM access speed. No external crystal is required for basic operation, though an external clock can be used via P1.3 for higher precision timing.

Does this device support USB Power Delivery (USB-PD) protocol implementation?

The CY8C4045FNI-DS400T does not include a dedicated USB-PD PHY or hardware PD message parser, but it provides all necessary peripherals-including overvoltage-tolerant P0.0/P0.1 for CC line sensing, dual SCBs for BMC-coded communication with a separate PD transceiver (e.g., CYPD3177), and TCPWM blocks for precise timing of PD signaling-making it a validated platform for custom USB-PD policy engine firmware in conjunction with external PD PHY ICs.

How many GPIO pins are available and what are their voltage tolerances?

The device offers nine GPIO pins in total, mapped across Ports 0 and 1. Only P0.0 and P0.1 are overvoltage-tolerant (OVT), rated for up to 5.5 V regardless of VDDD supply voltage. All other GPIOs operate within the VDDIO range (1.71–5.5 V) but are not OVT-exceeding VDDIO on non-OVT pins may cause latch-up or permanent damage. Pin count excludes SWD debug pins, which double as GPIO when debug is disabled.

Can the two SCB blocks operate simultaneously in different protocols?

Yes-the two Serial Communication Blocks (SCB[0] and SCB[1]) are fully independent and can be configured at runtime to operate in different protocols: for example, SCB[0] as Fast Mode Plus I²C (for sensor interface) and SCB[1] as SPI (for display driver), or both as UARTs with distinct baud rates. Each SCB has dedicated 8-deep TX/RX FIFOs and memory-mapped registers, eliminating resource contention and enabling true concurrent multi-protocol communication without software arbitration.