Renesas R5F5631KDDFC#V0

Overview

R5F5631KDDFC#V0 from Renesas is a 100 MHz 32-bit RX631 Group microcontroller featuring the RX CPU core with single-precision IEEE-754 FPU, 2 MB on-chip flash memory, 192 KB SRAM, 32 KB data flash, and integrated 12-bit/10-bit A/D converters. It supports Ethernet MAC (excluded in RX631), USB 2.0 full-speed host/function, CAN, multiple SCI/I²C/SPI interfaces, and operates from a 2.7–3.6 V supply across –40 to +85°C.

For engineers reviewing the R5F5631KDDFC#V0 datasheet, R5F5631KDDFC#V0 pinout, R5F5631KDDFC#V0 application, or R5F5631KDDFC#V0 equivalent, this MCU delivers deterministic real-time control with hardware-accelerated crypto (AES-128/192/256), CRC calculation, IEC60730 safety functions, and low-power modes - critical for industrial HMI, networked sensor nodes, and embedded gateway designs requiring deterministic timing and secure firmware updates.

Technical Context

The R5F5631KDDFC#V0 implements the RXv1 CPU core with 5-stage CISC Harvard pipeline, supporting 165 DMIPS at 100 MHz and ultra-compact variable-length instructions. Its memory subsystem includes zero-wait-state 100 MHz flash and SRAM, plus background-programmable 32 KB data flash with 100,000 write cycles.

Peripheral integration centers on deterministic real-time I/O: dual TPU units (12 channels total), MTU2 (6 channels), 13 SCI modules (including LIN-capable SCId), 4 RIIC interfaces (1 FM+), 3 CAN channels (32 mailboxes each), and dedicated DMA controllers (DMAC, EXDMAC, DTC) - all synchronized to independent clock domains (ICLK/PCLK/FCLK/BCLK).

Key Specifications

Pinout & Package

Package: PLQP0176KB-A - 176-pin LQFP, 24 × 24 mm, 0.5 mm pitch, RoHS-compliant, surface-mountable with standard reflow profile.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F563NDDFC#V0, the R5F5631KDDFC#V0 removes Ethernet and SDRAM support to reduce cost and power while retaining full USB/CAN/SCI connectivity and AES crypto - making it optimal for cost-sensitive, security-aware industrial controllers without LAN requirements. Against R5F566TADDFP#V0, it trades higher CPU speed and motor-specific timers for broader communication flexibility and integrated security.

Availability

R5F5631KDDFC#V0 is available at Aetrix Electronics and suitable for industrial HMI, smart metering, factory automation, and networked sensor gateway designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for R5F5631KDDFC#V0 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

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The RX631 Group targets cost-optimized industrial control applications, delivering high-performance 32-bit processing, rich analog/motor/peripheral integration, and functional safety features - all within a scalable, pin-compatible family architecture.

FAQ

What is the maximum operating frequency and CPU performance of the R5F5631KDDFC#V0?

The R5F5631KDDFC#V0 operates at a maximum frequency of 100 MHz and delivers 165 DMIPS using the RXv1 32-bit CPU core. Its single-precision IEEE-754 floating-point unit enables hardware-accelerated math operations essential for real-time control algorithms. This performance level is confirmed in the R01DS0098EJ0180 datasheet Rev.1.80, page 1.

Does the R5F5631KDDFC#V0 include an Ethernet MAC controller?

No, the R5F5631KDDFC#V0 belongs to the RX631 Group, which explicitly excludes the Ethernet MAC and associated EDMAC peripheral. That functionality is reserved for the RX63N Group (e.g., R5F563NDDFC#V0). The R5F5631KDDFC#V0 datasheet confirms this distinction in Table 1.2, page 8.

What memory resources are integrated into the R5F5631KDDFC#V0?

The R5F5631KDDFC#V0 integrates 2 MB of on-chip flash memory (zero-wait-state at 100 MHz), 192 KB of SRAM, and 32 KB of reprogrammable data flash rated for 100,000 erase/write cycles. These values are specified in Table 1.3 (page 9) of the R01DS0098EJ0180 document for the PLQP0176KB-A package variant.

Which communication interfaces does the R5F5631KDDFC#V0 support?

The R5F5631KDDFC#V0 supports USB 2.0 full-speed host/function/OTG (1 port each), 3 CAN channels (ISO 11898-1, 32 mailboxes each), up to 13 SCI modules (including LIN-capable SCId), 4 I²C interfaces (1 FM+), 3 SPI channels, and IEBus. These are detailed in Table 1.1 (pages 5–6) and Table 1.2 (page 8) of the official datasheet.

Is the R5F5631KDDFC#V0 suitable for IEC60730 Class B safety-critical applications?

Yes, the R5F5631KDDFC#V0 includes dedicated hardware features for IEC60730 compliance: oscillation-stop detection, frequency measurement circuitry, CRC calculator, independent watchdog timer (IWDT), and self-diagnostic capability for the 10-bit A/D converter - all documented in the "Useful functions for IEC60730 compliance" section (page 1).