R5F5631BCDFP - 100MHz 32-bit RX MCU, 1MB Flash | Renesas
MPN: R5F5631BCDFP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.5 | $14.50 |
| 10 | $12.85 | $128.50 |
| 100 | $11.4 | $1,140.00 |
| 500 | $10.1 | $5,050.00 |
| 1,000 | $9.05 | $9,050.00 |
R5F5631BCDFP Overview
An RX microcontroller (RX MCU) is a 32-bit microcontroller family built by Renesas around the proprietary RXv1 instruction set, designed for deterministic real-time control with hardware floating-point support. RX MCUs sit in the broader taxonomy of microcontrollers -> embedded processors -> 32-bit MCUs -> ARM/RISC-V/RX-class cores -> semiconductor devices, and they specifically target motor control, industrial networking, and graphical HMI workloads where deterministic interrupt latency and rich connectivity matter.
Key features include 1 MB on-chip flash (organised as 1 M x 8 in the datasheet) supporting in-system programming, 128 KB SRAM with background ECC, 12-bit A/D converter modules with multiple channels, multi-function timer pulse units supporting complementary PWM for three-phase motor drive, and safety functions such as a register write protection, clock-failure detection, and an independent watchdog timer.
Architecturally, the chip uses a 3-stage pipelined RXv1 core with a 32-bit multiplier and single-precision FPU, allowing floating-point DSP tasks (FFT, IIR/FIR filtering, current-loop math) to execute at full core clock. Memory protection, dual-bank flash for live firmware updates, and ELC (event link controller) hardware event routing minimise CPU intervention in motor-control and communication loops.
Typical applications include Ethernet-enabled industrial PLCs, building automation controllers, USB-class human interface devices, CAN/J1939 automotive body controllers, and EtherCAT/CANopen slave nodes on RX631 Group. The wide operating voltage range and built-in Ethernet MAC also suit smart energy concentrators. When designing in, plan for external decoupling near each VDD/VSS pair, follow the datasheet's recommended PCB land pattern for the LFQFP-100, and reserve boot-mode pins for the factory firmware programming sequence.
Drop-in alternatives for R5F5631BCDFP — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with R5F5631BCDFP (same form factor and footprint) — differing in ADC, Communication Interfaces, Package, Core Architecture, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
R5F56318CDFP#V0
✅ Drop-In✓ In Stock
$16.0781 / Unit
View Datasheet →R5F5631BDDFP#V0
✅ Drop-In📋 Reference alternative (not in catalog)
R5F563NWHDFP#V0
✅ Drop-In📋 Reference alternative (not in catalog)
R5F5631BCDFP Maximum Ratings & Electrical Characteristics
| Architecture | 32-bit RXv1 with single-precision FPU |
| Core Frequency | 100 MHz |
| Core Performance | 165 DMIPS |
| Program Memory (Flash) | 1 MB (1M x 8) |
| RAM | 128 KB |
| Data Bus Width | 32-bit (note: external bus width listed 16-bit in summary table) |
| Operating Voltage | 2.7 V to 3.6 V |
| ADC | 12-bit A/D converter modules |
| Communication Peripherals | SCI, RSPI, I2C, CAN, Ethernet MAC, USB 2.0 FS host/function/OTG |
| Timers | Motor-control timers (multi-function timer pulse units) |
| I/O Pins | 113 |
| Package | 100-LFQFP, 14 x 14 mm, 0.50 mm pitch, plastic |
| Mounting Type | Surface Mount (LFQFP) |
| Operating Temperature | -40C to +85C (industrial grade, per LFQFP100 Renesas family) |
| Special Features | Enhanced Security, Image Capture, Ethernet, full-speed USB |
| RoHS Status | Compliant |
R5F5631BCDFP 100-lfqfp, 14 x 14 mm, 0.50 mm pitch, plastic Pin Configuration Guide
Pin configuration for R5F5631BCDFP (100-lfqfp, 14 x 14 mm, 0.50 mm pitch, plastic package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for R5F5631BCDFP.
Refer to the datasheet for full pin configuration.
Typical Applications
R5F5631BCDFP is suitable for 6 applications: Industrial Ethernet PLC Controller, Three-Phase Motor Drive Controller, Building Automation Gateway, USB HID Touch Panel Controller, CAN-Based Automotive Body Controller, Compact Industrial HMI with LCD.
Industrial Ethernet PLC Controller
The R5F5631BCDFP fits Ethernet-enabled industrial PLCs because the integrated Ethernet MAC, 100-MHz RXv1 core with FPU, and 128 KB SRAM handle EtherCAT, PROFINET, or Modbus TCP slave stacks alongside ladder-logic execution. Place the part between the external PHY and the digital I/O isolators; the on-chip DMA offloads TCP/IP segmentation, leaving CPU cycles for PID loops. The 12-bit ADC with internal sample-and-hold is adequate for 4-20 mA analog-input modules, removing an external ADC BOM. Expected design benefit: deterministic sub-100-microsecond cycle times for cost-pressured PLC nodes versus a discrete MCU + external MAC solution that costs USD 3-5 more per board.
Recommended
Three-Phase Motor Drive Controller
Select the R5F5631BCDFP for three-phase BLDC or PMSM motor controllers because the multi-function timer pulse units offer complementary 16-bit PWM with dead-time insertion, while the 165-DMIPS FPU executes field-oriented control (FOC) math in single-step floating point. The 12-bit ADC can be hardware-triggered from the PWM timer for cycle-accurate current sensing at 100 kHz PWM. Compared with an ARM Cortex-M3 + external gate-driver MCU, this part saves board area, and the CAN peripheral synchronises motor modules on a daisy-chained industrial bus. The 1 MB flash fits full sensorless FOC plus UART bootloader, and the 14x14 LFQFP's exposed pad keeps junction temperatures within spec at 800 mA typical core + I/O load.
Recommended
Building Automation Gateway
The R5F5631BCDFP suits building-automation gateways because the integrated Ethernet MAC plus USB host controller handles BACnet/IP, KNX, or Modbus simultaneously, while the SCI/RSPI channels connect to wireless modules for Zigbee or LoRa. The 128 KB SRAM supports multi-protocol stack coexistence without external memory, and the 1 MB flash stores BACnet object dictionaries plus update firmware. Designers can run a small RTOS like FreeRTOS in cache-enabled mode, and the 113 I/O pins drive LCD keypad interfaces directly. Compared to an ARM M7 solution, this part cuts BOM by removing the external Ethernet PHY and offers lower power for the always-on networked idle loop. Typical use: 24 VAC-powered controllers in HVAC and lighting control panels.
Recommended
USB HID Touch Panel Controller
Choose the R5F5631BCDFP for USB-class touch-panel controllers because the full-speed USB 2.0 host/function/OTG port handles multi-touch digitiser data, while the 100-MHz core runs USB HID class drivers plus on-device gesture recognition. The 12-bit ADC reads resistive touch overlays, and the SCI ports can drive RS-232 service interfaces on the panel. Trade-off versus dedicated USB interface chips: this part consolidates a microcontroller + USB transceiver solution into a single 14x14 LFQFP, simplifying certification. The 1 MB flash stores multi-language UI assets and an OTA update bootloader. A 2 MB flash variant (R5F563NWHDFP#V0) is recommended once UI localisation exceeds 1 MB of compiled code.
Recommended
CAN-Based Automotive Body Controller
Deploy the R5F5631BCDFP in automotive body-control modules where the on-chip CAN interface, 32 KB on-chip data flash, and 1 MB program flash implement Body Domain Controllers without an external communication MCU. The 165-DMIPS FPU runs CANopen/CAN FD stacks plus PWM-driven lighting and seat-motor control, and the motor-control timer handles mirror-fold and window-pinch algorithms. Compared to legacy 16-bit automotive MCUs, the RX631 cuts interrupt latency to <50 ns, improving safety response for ADAS body-network edge nodes. The wide 2.7 V to 3.6 V supply tolerates cranking dips when paired with proper bulk capacitance on the supply rail.
Recommended
Compact Industrial HMI with LCD
Use the R5F5631BCDFP in compact industrial HMI panels where 113 GPIO pins directly drive 320x240 QVGA LCD modules, touch sensors, and keypads. The 128 KB SRAM holds partial-frame buffers, while the Ethernet MAC streams process data to SCADA hosts. The 12-bit ADC reads analogue front-panel encoders and 4-20 mA inputs. Compared to ARM Cortex-R parts, this RX631 offers pin-equivalent RAM at lower active-power dissipation (about 60 mA at 100 MHz), and the same LFQFP-100 land pattern lets designers swap to R5F563NWHDFP#V0 for richer graphics without PCB rework.
Recommended
Recommended Products Summary
Engineering reference data for R5F5631BCDFP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | R5F56318CDFP#V0 | R5F5631BDDFP#V0 | R5F563NWHDFP#V0 |
|---|---|---|---|---|
| Package | 100-LFQFP (14x14 mm, 0.50 mm pitch) | 100-LFQFP (14x14 mm) - same | 100-LFQFP (14x14 mm) - same | 100-LFQFP (14x14 mm) - same |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Core Frequency | 100 MHz | 100 MHz | 100 MHz | 100 MHz |
| Program Flash | 1 MB | 0.5 MB (-50%) | 1 MB (rebalanced) | 2 MB (+100%) |
| RAM | 128 KB | 128 KB | 128 KB | 128 KB |
| Ethernet MAC | Yes (integrated) | Yes | Yes | Yes |
| USB FS Host/OTG | Yes | Yes | Yes | Yes |
| CAN | Yes | Yes | Yes | Yes |
| Operating Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V |
| DMIPS | 165 | 165 | 165 | 165 |
Key Differentiators
- Same-footprint flash-scalable family (vs R5F56318CDFP#V0)
- Higher flash ceiling available on identical footprint (vs R5F563NWHDFP#V0)
- Direct Ethernet + USB MAC integration (vs External MAC + MCU split solution)
Design Notes
Estimated: at 100 MHz active core clock the R5F5631BCDFP draws ~60 mA from VDD (3.3 V), giving an active dissipation of ~200 mW. Place a 10 uF bulk + four 100 nF ceramic decouplators immediately adjacent to the four VDD/VSS pin pairs of the LFQFP-100. Use a ferrite bead or filter on AVCC to keep digital switching noise out of the 12-bit ADC reference rail; this avoids losing ~1 LSB of ADC noise margin on motor-current sense channels.
Follow the Renesas LFQFP-100 (14x14 mm, 0.50 mm pitch) land-pattern recommendations with 0.30 mm lead-to-pad extension and a continuous ground plane beneath the exposed thermal pad. Keep the ETH differential pair (typically MII/RMII) length-matched within 5 mm; the USB DP/DM traces must be 90-ohm differential with no stub routing. Trace away from the oscillator traces to avoid coupling into the analog PLL that supplies the USB and Ethernet clocks.
Do not omit the VCL pin bypass capacitor - the R5F5631BCDFP requires a 1 uF ceramic on VCL even when the internal regulator is used. Pin MD, TRST#, and the boot-mode select pins must be pulled correctly at reset to enter the correct boot mode (single-chip vs external bus), and the EMLE pin must be tied low in production to keep the on-chip emulator disabled. Set the OFS register to enable the independent watchdog before shipping firmware, especially in CAN/J1939 applications.
Estimated: the LFQFP-100 with a continuous ground pad delivers a theta_JA of about 35 C/W on a 4-layer 1-oz PCB. At 200 mW active dissipation, junction rise is about 7 C above ambient, so no explicit heatsink is required. For sealed industrial enclosures with 65 C ambient, plan margin by connecting the exposed thermal pad to the internal ground plane through four thermal vias in a 0.3 mm-pitch array.
Compliance Information
Renesas LFQFP package. AEC-Q100 status not documented for the R5F5631BCDFP#V0 variant; check R5F5631BCDFP-V0 datasheet ordering options for automotive grade equivalents. Halogen-free status not explicitly listed on the verified distributor pages.
