Renesas R5F521A8BDFM#V0

Overview

R5F521A8BDFM#V0 from Renesas Electronics is a 32-bit RX CPU-based microcontroller optimized for high-precision analog sensing and industrial control, operating at 50 MHz (78 DMIPS), featuring 512 KB on-chip flash, 64 KB SRAM, 8 KB data flash, integrated 24-bit ∆Σ A/D converter (7 channels, SNDR = 85 dB), 10-bit A/D and D/A converters, AES encryption (DEU), RTC with deep software standby wake-up, and IrDA support via SCI5 - deployed in smart metering and motor control systems.

For engineers reviewing the R5F521A8BDFM#V0 datasheet, R5F521A8BDFM#V0 pinout, R5F521A8BDFM#V0 application, or R5F521A8BDFM#V0 equivalent, this page delivers verified technical context, package-specific pin mapping, real-world use cases, and validated alternative parts - all grounded in Renesas' official RX21A Group documentation (R01DS0129EJ0110 Rev.1.10).

Technical Context

The R5F521A8BDFM#V0 implements a CISC Harvard architecture with 5-stage pipeline, 32×32-bit multiplier (1-cycle), 64-bit accumulator, and memory protection unit (MPU). Its clock system integrates PLL (4–12.5 MHz input), sub-clock oscillator (32.768 kHz), and dedicated IWDT oscillator (125 kHz), enabling independent domain clocking: ICLK up to 50 MHz, PCLK up to 25 MHz, FCLK up to 25 MHz.

Analog subsystems include a 24-bit ∆Σ A/D with programmable gain (×1–×64 differential, ×1–×4 single-ended), 10-bit A/D (2.0 μs conversion), dual 10-bit D/A outputs, two 2-channel comparators, and calibrated temperature sensor. Peripheral coordination is enhanced by ELC (69 event sources) and MPC for flexible pin assignment across 64 LQFP pins.

Key Specifications

Pinout & Package

Package: PLQP0064KB-A - 64-pin LQFP, 10 × 10 mm, 0.5-mm pitch, lead-free, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F521A8BDFM#V0, the R5F521A7BDFM#V0 retains full peripheral compatibility and calibration features but reduces flash by 128 KB, while R5F521A6BDFM#V0 further scales down both flash and SRAM - all three share identical pinout, timing, and safety support, enabling incremental design optimization.

Availability

R5F521A8BDFM#V0 is available at Aetrix Electronics and suitable for smart metering, industrial motor control, and medical sensor interface applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for R5F521A8BDFM#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 Corporation is a global semiconductor leader specializing in microcontrollers, analog, and power solutions for automotive, industrial, and IoT markets.

The RX21A Group - to which R5F521A8BDFM#V0 belongs - was designed specifically for high-precision analog-intensive applications such as energy metering, motor control, and industrial automation, integrating metrology-grade ADCs with robust real-time processing and functional safety features.

FAQ

What is the maximum operating frequency and CPU performance of the R5F521A8BDFM#V0?

The R5F521A8BDFM#V0 operates at a maximum frequency of 50 MHz and delivers 78 DMIPS of processing performance. Its RX CPU core features a 5-stage pipeline, 32×32-bit hardware multiplier completing in one cycle, and a 64-bit accumulator - enabling deterministic execution for real-time control loops and digital signal processing tasks within the R5F521A8BDFM#V0.

Does the R5F521A8BDFM#V0 support IrDA communication, and how is it implemented?

Yes, the R5F521A8BDFM#V0 supports IrDA 1.0-compliant infrared communication through SCI5, using dedicated IRTXD5 and IRRXD5 pins. The hardware handles IrDA encoding/decoding without CPU involvement, allowing low-latency, low-power wireless data exchange - a feature confirmed in the R5F521A8BDFM#V0 datasheet section "Communication Function" and block diagram.

What analog peripherals are integrated into the R5F521A8BDFM#V0, and what are their key specifications?

The R5F521A8BDFM#V0 integrates a 24-bit ∆Σ A/D converter (7 channels, SNDR = 85 dB, PGA ×1–×64), a 10-bit A/D converter (7 channels, 2.0 μs conversion), two 10-bit D/A outputs, two 2-channel analog comparators (CMPA/CMPB), and a calibrated temperature sensor. All analog blocks share dedicated power/ground and reference pins (AVCCA/AVSSA, VREFH/VREFL) to maintain signal integrity in mixed-signal designs.

What package type and pin count does the R5F521A8BDFM#V0 use?

The R5F521A8BDFM#V0 uses the PLQP0064KB-A package: a 64-pin LQFP measuring 10 × 10 mm with 0.5-mm pitch. This package supports 38 general-purpose I/O pins, including 28 with open-drain capability and 2 with 5-V tolerance - as specified in Table 1.2 ("Comparison of Functions for Different Packages") and Figure 1.5 of the R5F521A8BDFM#V0 datasheet.

How does the R5F521A8BDFM#V0 support functional safety standards like IEC60730?

The R5F521A8BDFM#V0 includes hardware-assisted safety features for IEC60730 compliance: self-diagnostic A/D disconnection detection, clock accuracy measurement circuit (CAC), independent watchdog timer (IWDT) with dedicated oscillator, RAM test assist functions, and voltage monitoring circuits (LVDAa) with configurable thresholds - all documented in the "Useful functions for IEC60730 compliance" section of the R5F521A8BDFM#V0 datasheet.