Renesas R5F5631DDDLC#U0

Overview

R5F5631DDDLC#U0 from Renesas is a 100 MHz 32-bit RXv1 CPU-based microcontroller in the RX631 Group, featuring 1.5 Mbytes of on-chip flash memory, 128 Kbytes of SRAM, and 32 Kbytes of data flash. It integrates a 12-bit A/D converter (21 channels), 10-bit A/D converter (8 channels), dual 10-bit D/A converters, Ethernet MAC (not present - RX631 Group excludes Ethernet), USB 2.0 host/function interface, CAN v2.0B (2 channels), and real-time clock with battery backup - designed for industrial HMI and networked sensor gateway applications.

For engineers reviewing the R5F5631DDDLC#U0 datasheet, R5F5631DDDLC#U0 pinout, R5F5631DDDLC#U0 application, or R5F5631DDDLC#U0 equivalent, key selection criteria include its RX631-specific feature set (no Ethernet, sub-clock oscillator, battery backup, or SDRAM controller), 176-pin LQFP package (PLQP0176KB-A), -40°C to +85°C operating range (D version), and compatibility with E1/E20 debug interfaces via JTAG/FINE.

Technical Context

The R5F5631DDDLC#U0 implements the RXv1 core with Harvard architecture, 5-stage pipeline, and variable-length instructions enabling ultra-compact code density. It supports IEEE-754 single-precision floating-point operations and includes two multiply-and-accumulate units plus a 32-bit multiplier executing in one cycle and a divider in two cycles.

Its peripheral suite is optimized for deterministic real-time control: MTU2 and TPU timers deliver PWM, input capture, and phase-counting; the DTC and DMAC enable zero-CPU-overhead data movement; and the integrated DEU provides AES-128/192/256 encryption in ECB/CBC modes - all operating under MPU-protected memory space with configurable endian support.

Key Specifications

Pinout & Package

Package: PLQP0176KB-A - 176-pin LQFP, 24 × 24 mm, 0.5 mm pitch, RoHS-compliant, thermally enhanced for industrial convection cooling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F5631DDDLC#U0, the R5F563NDDDLC#U0 adds Ethernet and SDRAM support but increases BOM cost and PCB complexity, while the R5F5630ADDLC#U0 reduces peripheral count and memory to lower unit cost - making R5F5631DDDLC#U0 the optimal balance for industrial gateways needing USB host, dual CAN, and robust analog I/O without Ethernet overhead.

Availability

R5F5631DDDLC#U0 is available at Aetrix Electronics and suitable for industrial HMI panels, smart sensor gateways, PLC I/O modules, energy metering subsystems, and embedded USB host applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for R5F5631DDDLC#U0 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 is part of Renesas' 32-bit RX MCU family, engineered for deterministic real-time performance in industrial automation, building control, and networked embedded systems - emphasizing functional safety, analog integration, and USB/CAN connectivity without Ethernet overhead.

FAQ

What is the maximum operating frequency and core architecture of the R5F5631DDDLC#U0?

The R5F5631DDDLC#U0 operates at a maximum frequency of 100 MHz and uses the 32-bit RXv1 CPU core with a 5-stage pipeline, Harvard architecture, and variable-length instruction set. This architecture delivers 165 DMIPS performance and supports IEEE-754 single-precision floating-point operations - enabling efficient execution of real-time control algorithms in the R5F5631DDDLC#U0 without software emulation.

Does the R5F5631DDDLC#U0 include an Ethernet MAC controller?

No, the R5F5631DDDLC#U0 belongs to the RX631 Group, which explicitly excludes the Ethernet MAC, EDMAC, and associated RMII/MII interface - unlike the RX63N Group. This omission reduces pin count, power consumption, and layout complexity, making the R5F5631DDDLC#U0 appropriate for USB- or CAN-based networked devices where 10/100 Mbps Ethernet is not required.

What package type and pin count does the R5F5631DDDLC#U0 use?

The R5F5631DDDLC#U0 is supplied in the PLQP0176KB-A package: a 176-pin LQFP with 24 × 24 mm body size and 0.5 mm pitch. This RoHS-compliant package supports industrial thermal dissipation and provides 133 general-purpose I/O pins (including 18 with 5-V tolerance), making it suitable for high-density industrial PCB layouts requiring robust signal routing and debug accessibility.

How much on-chip memory does the R5F5631DDDLC#U0 integrate?

The R5F5631DDDLC#U0 integrates 1.5 Mbytes of on-chip flash memory (zero-wait-state at 100 MHz), 128 Kbytes of SRAM (also zero-wait-state), and 32 Kbytes of reprogrammable data flash rated for 100,000 erase/write cycles. This memory configuration supports complex firmware with real-time task stacks, buffered communications, and secure parameter storage - all within the R5F5631DDDLC#U0 die without external memory components.

Is the R5F5631DDDLC#U0 supported for IEC60730 Class B safety certification?

Yes, the R5F5631DDDLC#U0 includes hardware features required for IEC60730 Class B compliance: oscillation-stop detection, built-in CRC calculator (with three polynomials), independent watchdog timer (IWDT), self-diagnostic function for the 10-bit A/D converter, and clock frequency measurement capability. These capabilities are documented in the R01DS0098EJ0180 datasheet and reduce software validation effort for the R5F5631DDDLC#U0 in safety-critical industrial applications.