Infineon Technologies CY8C6245FNI-S3D71T

Overview

CY8C6245FNI-S3D71T from Infineon is a dual-core Arm® Cortex®-M4F/M0+ PSOC™ 62 microcontroller with 512 KB flash, 256 KB SRAM, integrated CAN FD, USB Full-Speed, and hardware cryptography acceleration. It operates from 1.7–3.6 V, achieves 7 µA Deep Sleep current with 64 KB SRAM retention, and supports XIP from external QSPI flash at up to 320 Mbps-targeted for secure, ultra-low-power IoT edge nodes requiring real-time sensor fusion and wireless coexistence.

For engineers reviewing the CY8C6245FNI-S3D71T datasheet, CY8C6245FNI-S3D71T pinout, CY8C6245FNI-S3D71T application, or CY8C6245FNI-S3D71T equivalent, key selection criteria include dual-CPU power efficiency (22 µA/MHz @ 0.9 V M4), on-chip DC-DC quiescent current (<1 µA), CAN FD + USB FS concurrent operation, and hardware-accelerated AES/SHA/TRNG for secure boot and firmware updates.

Technical Context

This MCU implements a tightly coupled dual-CPU subsystem where the Cortex-M4F handles compute-intensive tasks (e.g., signal processing, protocol stacks) while the Cortex-M0+ manages low-power background operations (e.g., capacitive sensing, timer sequencing) and inter-processor communication via hardware IPC channels. Both cores share memory-mapped peripherals but operate under independent power domains.

The clock system integrates multiple oscillators (8 MHz IMO ±2%, 32 kHz ILO, external crystal support up to 35 MHz), dual PLL/FLL frequency synthesis, and integer/fractional peripheral dividers-enabling precise clock domain isolation for mixed-signal timing, USB frame synchronization, and deterministic TCPWM dead-time control.

Key Specifications

Pinout & Package

This device is packaged in a 100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch) with 64 GPIOs, including two overvoltage-tolerant (OVT) pins and two Smart I/O ports (8 pins total) supporting Boolean logic during Deep Sleep.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-core, secure MCU applications.

Compared with LPC55S69 and RA6M5, CY8C6245FNI-S3D71T uniquely delivers sub-10 µA Deep Sleep with 64 KB SRAM retention, on-chip DC-DC, and Smart I/O Boolean offload-making it optimal for battery-constrained, event-driven IoT endpoints requiring concurrent wired/wireless interfaces and hardware-rooted security.

Availability

CY8C6245FNI-S3D71T is available at Aetrix Electronics and suitable for smart home hubs, industrial sensor nodes, medical wearables, and automotive body controllers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for CY8C6245FNI-S3D71T 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 German semiconductor manufacturer specializing in power management, automotive ICs, and secure microcontrollers, with global R&D and manufacturing infrastructure.

This part belongs to the PSoC™ 62 product line-designed specifically for secure, ultra-low-power IoT endpoints that require concurrent wireless connectivity, rich analog sensing, and hardware-enforced trust anchors.

FAQ

Does CY8C6245FNI-S3D71T support simultaneous CAN FD and USB Full-Speed operation?

Yes. The device integrates independent CAN FD and USB Full-Speed controllers with dedicated DMA channels and clock domains. Both peripherals can operate concurrently without resource contention-the CAN FD block uses its own APB interface and interrupt vector, while USB FS uses a separate USB PHY and endpoint FIFO structure. Verified operation includes simultaneous CAN FD message transmission and USB HID report updates at full bandwidth.

What is the maximum external QSPI flash size supported in XIP mode?

The SMIF controller supports up to 256 MB of external QSPI flash in XIP mode using 24-bit addressing. Address space is mapped into the Cortex-M4 instruction bus with hardware prefetch and 4 KB cache; throughput reaches 320 Mbps in quad mode with DDR timing. No software remapping is required-the flash appears as contiguous memory starting at 0x18000000.

How does the Smart I/O subsystem reduce power in Deep Sleep?

Smart I/O ports (P0 and P1) contain dedicated PLD-like logic blocks that execute Boolean functions (AND/OR/XOR/NOT) on GPIO inputs without waking either CPU. Each port supports up to 8 pins with configurable trigger conditions (edge/rising/falling), enabling autonomous wake-up sources-for example, detecting a specific button matrix pattern or sensor interrupt sequence while consuming only ~1 µA total.

Is the on-chip temperature sensor calibrated at factory?

Yes. The silicon-integrated temperature sensor is factory-trimmed across the -40°C to +85°C range and stored in SFlash. Calibration data is automatically loaded by the PSoC™ 62 boot ROM, enabling ±1.5°C accuracy from -25°C to +75°C without user calibration. The sensor connects directly to the SAR ADC's dedicated channel and can be read via the CapSense_CSD_GetTemperature() API in ModusToolbox™.