Renesas R5F5631PFDLH#U0

Overview

R5F5631PFDLH#U0 from Renesas is a 100 MHz 32-bit RX631 Group microcontroller featuring a 32-bit RX CPU core, 512 KB on-chip flash memory, 128 KB SRAM, and integrated 12-bit/10-bit A/D converters. It supports USB 2.0 full-speed host/function interface, CAN (ISO 11898-1), up to 13 SCI channels, and operates from a single 2.7–3.6 V supply across –40 to +85°C. This MCU targets industrial control and embedded HMI applications requiring deterministic real-time performance without Ethernet.

For engineers reviewing the R5F5631PFDLH#U0 datasheet, R5F5631PFDLH#U0 pinout, R5F5631PFDLH#U0 application, or R5F5631PFDLH#U0 equivalent, key selection criteria include its RX631-specific feature set (no Ethernet MAC), LQFP-176 package with 133 I/O pins, 5-V-tolerant inputs, and support for IEC60730 safety compliance functions including CRC, self-diagnostic A/D, and oscillation-stop detection.

Technical Context

The R5F5631PFDLH#U0 implements the RXv1 CPU core with CISC Harvard architecture, 5-stage pipeline, and variable-length instructions enabling ultra-compact code density. It integrates a single-precision IEEE-754 FPU, two multiply-and-accumulate units, and a 32-bit multiplier executing in one cycle - delivering 165 DMIPS at 100 MHz.

Its peripheral subsystem includes four DMA channels (DMAC), a data transfer controller (DTC), and dedicated timer units (MTU2, TPU) supporting PWM, input capture, phase counting, and A/D trigger generation. The device lacks Ethernet MAC and EDMAC - distinguishing it from RX63N variants - and omits RTC and battery backup functionality per RX631 Group specification.

Key Specifications

Pinout & Package

Package: PLQP0176KB-A - 176-pin LQFP, 24 × 24 mm body, 0.5 mm pitch, exposed pad (thermal pad not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F563NFDLH#U0, the R5F5631PFDLH#U0 removes Ethernet and RTC to reduce cost and power, while retaining full USB host capability and IEC60730 safety features; versus R5F566TDDFK#U0, it trades higher CPU throughput and motion-control peripherals for broader communications flexibility and larger flash/SRAM options in the same footprint family.

Availability

R5F5631PFDLH#U0 is available at Aetrix Electronics and suitable for industrial automation, building management systems, and medical HMI applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for R5F5631PFDLH#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 industrial, automotive, and IoT markets.

The RX631 Group is designed for cost-optimized, safety-aware embedded control applications where Ethernet is unnecessary but USB host, CAN, and rich analog integration are essential - targeting PLCs, HVAC controllers, and diagnostic equipment.

FAQ

What is the maximum operating frequency and core type of the R5F5631PFDLH#U0?

The R5F5631PFDLH#U0 operates at a maximum frequency of 100 MHz and uses the 32-bit RXv1 CPU core with CISC Harvard architecture, 5-stage pipeline, and variable-length instructions. It delivers 165 DMIPS performance and includes a single-precision IEEE-754 floating-point unit. This core enables deterministic real-time execution critical for industrial control loops and motor drive applications where the R5F5631PFDLH#U0 is commonly deployed.

Does the R5F5631PFDLH#U0 include an Ethernet MAC controller?

No, the R5F5631PFDLH#U0 does not include an Ethernet MAC controller. It belongs to the RX631 Group, which explicitly excludes Ethernet functionality - unlike the RX63N Group. This omission reduces silicon area, power consumption, and cost while maintaining full USB 2.0 host/function, CAN, and multiple serial interfaces. Engineers selecting the R5F5631PFDLH#U0 must implement network connectivity externally if required, as the R5F5631PFDLH#U0 provides no MII/RMII pins or associated DMA resources.

What flash and RAM capacities are integrated in the R5F5631PFDLH#U0?

The R5F5631PFDLH#U0 integrates 512 KB of on-chip main flash memory and 128 KB of on-chip SRAM, both operating at 100 MHz with zero wait states. The flash supports background programming/erasing and on-board programming via JTAG or FINE. The SRAM is unified for instructions and data and supports deep software standby backup. These capacities are fixed for this specific part number and align with the RX631 Group's mid-range memory configuration - distinct from ROMless or 2 MB variants in the same family.

Which package and pin count does the R5F5631PFDLH#U0 use?

The R5F5631PFDLH#U0 uses the PLQP0176KB-A package: a 176-pin LQFP with 24 × 24 mm body size and 0.5 mm pitch. It provides 133 general-purpose I/O pins, 18 of which are 5-V tolerant, plus dedicated power, ground, clock, reset, and debug interface pins. This package matches other RX63N/RX631 LQFP-176 variants, enabling layout reuse where Ethernet is not required - a key advantage when migrating from R5F563NFDLH#U0 to the R5F5631PFDLH#U0 in cost-sensitive designs.

Does the R5F5631PFDLH#U0 support IEC60730 functional safety compliance?

Yes, the R5F5631PFDLH#U0 includes hardware features specifically intended to simplify IEC60730 Class B compliance: oscillation-stoppage detection, hardware CRC calculator (with three polynomials), independent watchdog timer (IWDT), self-diagnostic function for the 10-bit A/D converter, and frequency measurement capability via MTU/TPU modules. These capabilities reduce firmware validation burden and enable robust failure detection - making the R5F5631PFDLH#U0 suitable for safety-critical household appliances and industrial controls where the R5F5631PFDLH#U0 is certified for use.