Renesas R5F5631BCDLK#U0

Overview

R5F5631BCDLK#U0 from Renesas is a 100 MHz 32-bit RX631 Group microcontroller with integrated FPU, 1 MB on-chip flash memory, 128 KB SRAM, and 32 KB data flash. It features a 12-bit A/D converter (21 channels), 10-bit D/A converter (2 channels), RTC, USB 2.0 function controller, CAN interface, and Ethernet MAC - though Ethernet is excluded in the RX631 Group per official documentation. It targets industrial control systems requiring deterministic real-time performance and functional safety support.

For engineers reviewing the R5F5631BCDLK#U0 datasheet, R5F5631BCDLK#U0 pinout, R5F5631BCDLK#U0 application, or R5F5631BCDLK#U0 equivalent, key selection criteria include its 100 MHz CPU speed, IEEE-754 single-precision FPU, IEC60730-compliant self-test functions (CRC, IWDT, A/D self-diagnostic), and package-specific peripheral availability - especially absence of Ethernet and reduced SCI/TPU channel count versus RX63N.

Technical Context

The R5F5631BCDLK#U0 implements the 32-bit RX CPU core with 5-stage CISC Harvard pipeline, supporting variable-length instructions and ultra-compact code density. It integrates a memory protection unit (MPU), JTAG/FINE debug interfaces, and four low-power modes including deep software standby with SRAM backup.

Its clock system includes internal 125-kHz LOCO and 50-MHz HOCO oscillators, external crystal support (4–16 MHz), and PLL-based 100 MHz system clock (ICLK). Peripheral clocks (PCLK, FCLK, BCLK) are independently configurable up to 50 MHz, enabling optimized timing for flash access, DMA, and external bus operations.

Key Specifications

Pinout & Package

Package: 145-pin TFLGA (PTLG0145KA-A), 7 mm × 7 mm, 0.5 mm pitch, 0.8 mm height - suitable for space-constrained industrial modules and motor drives.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F5631BCDLK#U0, the R5F563NACDLK#U0 adds critical networking capability at the expense of package size and complexity, while the R5F562TADFP#30 trades general-purpose peripherals for domain-specific motor control acceleration - making each optimal for distinct system-level requirements.

Availability

R5F5631BCDLK#U0 is available at Aetrix Electronics and suitable for industrial motor control, building automation gateways, factory floor I/O modules, and portable medical diagnostic equipment requiring stable component supply and long-term manufacturability.

Supply support for R5F5631BCDLK#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, and power solutions for automotive, industrial, and IoT markets.

The RX631 Group is designed for cost-optimized industrial control applications demanding real-time performance, functional safety support (IEC60730), and rich peripheral integration - without Ethernet overhead.

FAQ

Does R5F5631BCDLK#U0 include an Ethernet MAC?

No, R5F5631BCDLK#U0 belongs to the RX631 Group, which explicitly excludes the Ethernet MAC and associated EDMAC found in the RX63N Group. This distinction is confirmed in Table 1.2 of the official datasheet (R01DS0098EJ0180), where Ethernet controller availability is marked "Not available" for all RX631 packages including the 145-pin TFLGA. Engineers selecting R5F5631BCDLK#U0 must implement external Ethernet PHY or choose an RX63N variant if native MAC is required.

What is the maximum operating frequency and corresponding performance of R5F5631BCDLK#U0?

R5F5631BCDLK#U0 operates at a maximum system clock (ICLK) frequency of 100 MHz, delivering 165 DMIPS of computational throughput. Its 32-bit RX CPU core executes instructions in one cycle at this speed, with single-precision floating-point operations compliant to IEEE-754. This enables deterministic real-time response for motor control, sensor fusion, and protocol stack processing - verified under industrial temperature (-40°C to +85°C) and 2.7–3.6 V supply conditions.

How much on-chip memory does R5F5631BCDLK#U0 provide?

R5F5631BCDLK#U0 integrates 1 MB of on-chip flash memory (zero-wait-state at 100 MHz), 128 KB of SRAM (no-wait access), and 32 KB of reprogrammable data flash rated for 100,000 erase/write cycles. The flash supports background programming/erasing (BGO), enabling firmware updates without halting application execution - critical for field-deployed industrial devices requiring high uptime.

Which communication interfaces are supported by R5F5631BCDLK#U0?

R5F5631BCDLK#U0 supports USB 2.0 full-speed device mode (12 Mbps), CAN (2 channels, ISO11898-1 compliant), up to 11 SCI channels (asynchronous, clock-synchronous, SPI/I²C emulation), 4 I²C bus interfaces (up to 1 Mbps), 3 RSPI channels, and IEBus. It lacks Ethernet and OTG functionality - both reserved for RX63N variants. Peripheral channel counts are package-dependent; the 145-pin TFLGA supports 11 SCI, 2 CAN, and 4 RIIC channels as specified in Table 1.2.

Is R5F5631BCDLK#U0 qualified for functional safety standards like IEC60730?

Yes, R5F5631BCDLK#U0 includes dedicated hardware features for IEC60730 Class B compliance: oscillation-stoppage detection, frequency measurement circuitry, CRC calculator (with three polynomials), independent watchdog timer (IWDT), and self-diagnostic function for the 10-bit A/D converter. These are documented in the "Useful functions for IEC60730 compliance" section of the datasheet and do not require external components - reducing certification effort for household and industrial appliances.