Renesas R5F5631KDDFB#V0

Overview

R5F5631KDDFB#V0 from Renesas is a 100 MHz 32-bit RX CPU-based microcontroller in the RX631 Group, featuring 2 MB on-chip flash memory, 192 KB SRAM, 32 KB data flash, IEEE-754 single-precision FPU, and integrated 10-/12-bit A/D converters. It supports full-speed USB 2.0 host/function/OTG, CAN (2 channels), up to 13 SCI interfaces, 4 I²C channels, and operates from a single 2.7–3.6 V supply across –40 to +85°C. It targets industrial HMI, networked sensor nodes, and embedded control systems requiring deterministic real-time performance without Ethernet.

For engineers reviewing the R5F5631KDDFB#V0 datasheet, R5F5631KDDFB#V0 pinout, R5F5631KDDFB#V0 application, or R5F5631KDDFB#V0 equivalent, key selection criteria include its 176-pin LQFP package (PLQP0176KB-A), absence of Ethernet MAC (distinguishing it from RX63N), 2 MB flash/192 KB RAM configuration, USB OTG capability, and support for IEC60730 safety compliance functions including CRC, self-diagnostic A/D, and oscillation-stop detection.

Technical Context

The R5F5631KDDFB#V0 implements the RXv1 CPU core with CISC Harvard architecture, 5-stage pipeline, and variable-length instructions enabling ultra-compact code density. It integrates a memory protection unit (MPU), JTAG/FINE debugging interfaces, and supports little-endian or big-endian data arrangement - configurable per external bus area.

Its clock system includes main crystal oscillator (4–16 MHz), internal 50 MHz HOCO and 125 kHz LOCO, PLL frequency synthesizer, and independent IWDT-dedicated oscillator. Peripheral clocks (PCLK, FCLK, BCLK) are independently configurable up to 50 MHz, while system clock (ICLK) runs at up to 100 MHz with no wait-state flash access.

Key Specifications

Pinout & Package

Package: PLQP0176KB-A - 176-pin LQFP, 24 × 24 mm, 0.5 mm pitch, RoHS-compliant, lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F563NDDFB#V0, the R5F5631KDDFB#V0 omits Ethernet hardware to reduce cost and power, making it optimal for USB-connected edge devices; versus R5F566TADDFB#V0, it trades raw speed for broader peripheral coverage (USB, CAN, I²C, PDC) and cryptographic acceleration essential for secure IoT endpoints.

Availability

R5F5631KDDFB#V0 is available at Aetrix Electronics and suitable for industrial HMI, smart sensor nodes, PLC I/O modules, and medical diagnostic instruments requiring stable component supply, long-term lifecycle support, and automotive-grade reliability under extended temperature conditions.

Supply support for R5F5631KDDFB#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 delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT markets.

The RX631 Group was designed specifically for cost-sensitive, high-integration embedded applications demanding real-time determinism, functional safety support (IEC60730), and rich connectivity - without the overhead of Ethernet PHY integration.

FAQ

What is the maximum operating frequency and flash access speed of the R5F5631KDDFB#V0?

The R5F5631KDDFB#V0 operates at a maximum system clock (ICLK) frequency of 100 MHz with zero wait-state access to its 2 MB on-chip flash memory. This enables deterministic instruction fetch and real-time interrupt response critical for industrial control loops. The R5F5631KDDFB#V0 achieves 165 DMIPS performance at this speed, validated by Renesas' benchmarking methodology using the EEMBC CoreMark suite.

Does the R5F5631KDDFB#V0 support USB On-The-Go (OTG) functionality?

Yes, the R5F5631KDDFB#V0 integrates a USB 2.0 full-speed host/function module supporting OTG operation. It includes an on-chip transceiver, 2 KB dedicated RAM buffer, and hardware support for session request protocol (SRP) and host negotiation protocol (HNP). This allows the R5F5631KDDFB#V0 to dynamically switch between host and peripheral roles - for example, acting as a USB device when connected to a PC or as a host when reading from a USB flash drive.

How many CAN modules does the R5F5631KDDFB#V0 include, and what protocol versions are supported?

The R5F5631KDDFB#V0 includes two independent CAN modules compliant with ISO11898-1, supporting both standard (11-bit ID) and extended (29-bit ID) frame formats. Each module provides 32 dedicated mailboxes with programmable acceptance filtering, FIFO buffering, and automatic retransmission. These modules are fully compatible with CANopen and DeviceNet physical layer requirements, and operate at bit rates up to 1 Mbps with programmable timing quanta.

Is the R5F5631KDDFB#V0 qualified for industrial temperature range operation?

Yes, the R5F5631KDDFB#V0 is rated for industrial temperature operation from –40°C to +85°C (D version). Its design includes robust voltage monitoring (LVD), thermal compensation for the on-die temperature sensor (±1°C accuracy), and validated operation across the full range with all peripherals active. This qualification is confirmed in Renesas document R01DS0098EJ0180, Section 1.1, and applies specifically to the R5F5631KDDFB#V0 in the PLQP0176KB-A package.

What security features are implemented in the R5F5631KDDFB#V0 for firmware protection?

The R5F5631KDDFB#V0 incorporates multiple hardware-enforced security features: a Data Encryption Unit (DEU) supporting AES-128/192/256 in ECB/CBC modes; a Memory Protection Unit (MPU) for privilege-level memory access control; register write protection for critical control registers; and IEC60730-compliant self-test capabilities including CRC calculation and A/D converter diagnostics. These features collectively protect firmware integrity, prevent unauthorized code execution, and enable secure boot and OTA update workflows in the R5F5631KDDFB#V0.