Renesas R5F521A6BDFM#30

Overview

R5F521A6BDFM#30 from Renesas Electronics is a 32-bit RX CPU-based microcontroller with 256 KB on-chip flash, 32 KB SRAM, and 8 KB data flash, operating at up to 50 MHz (78 DMIPS) across −40°C to +85°C. It integrates a 24-bit ∆Σ A/D converter (7 channels, SNDR = 85 dB), 10-bit A/D (7 channels, 2.0 μs conversion), dual 10-bit D/A outputs, AES encryption (DEU), RTC with deep software standby wake-up, and nine communication interfaces including SCI (5 ch), I²C (2 ch), RSPI (2 ch), and IrDA (via SCI5). It targets high-precision industrial sensing and metering systems requiring simultaneous analog acquisition and secure firmware execution.

For engineers reviewing the R5F521A6BDFM#30 datasheet, R5F521A6BDFM#30 pinout, R5F521A6BDFM#30 application, or R5F521A6BDFM#30 equivalent, this page delivers verified specifications, package mapping to PLQP0064KB-A (64-pin LQFP), validated pin functions per Renesas R01DS0129EJ0110 Rev.1.10, confirmed alternative parts with documented functional differences, and real-world use cases in energy metering, motor control feedback, and industrial temperature monitoring.

Technical Context

The R5F521A6BDFM#30 implements a CISC Harvard architecture with 5-stage pipeline, 32×32-bit multiplier/divider (1-cycle multiply), 64-bit accumulator, and memory protection unit (MPU). Its clock system includes PLL (4–12.5 MHz input), sub-clock oscillator (32.768 kHz), and dedicated IWDT oscillator (125 kHz), enabling independent RTC operation during deep software standby.

It supports event-driven operation via ELC (69 event sources), allowing timer-triggered A/D conversion and peripheral activation without CPU intervention. The MPC enables flexible peripheral pin assignment, while the DSAD module provides programmable PGA gain (×1–×64 differential, ×1–×4 single-ended) and calibration registers for impedance and gain compensation per channel.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit MCU applications.

Compared with R5F521A6BDFM#30, R5F521A6BDFP offers expanded I/O and analog resources in a larger footprint, while R5F521A7BDFM provides increased memory capacity with full pin-to-pin compatibility-enabling cost-optimized scaling from basic to feature-rich variants without redesign.

Availability

R5F521A6BDFM#30 is available at Aetrix Electronics and suitable for industrial metering, motor control feedback, and smart sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for R5F521A6BDFM#30 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 industrial, automotive, and IoT markets.

The RX21A Group, including R5F521A6BDFM#30, was designed for high-precision analog-intensive applications such as energy measurement, motor control, and industrial automation-emphasizing metrology-grade ADC performance, low-power operation, and functional safety features.

FAQ

What is the maximum operating frequency and CPU performance of the R5F521A6BDFM#30?

The R5F521A6BDFM#30 operates at a maximum frequency of 50 MHz, delivering 78 DMIPS of processing performance. Its 32-bit RX CPU core features a 5-stage pipeline, 32×32-bit hardware multiplier with 1-cycle execution, and 64-bit accumulator for high-precision arithmetic-making it suitable for real-time control and metrology algorithms where deterministic timing is critical. This performance is sustained across the full −40°C to +85°C operating range.

Does the R5F521A6BDFM#30 support hardware encryption, and what standards does it implement?

Yes, the R5F521A6BDFM#30 includes a dedicated Data Encryption Unit (DEU) that supports AES encryption and decryption with 128-, 192-, or 256-bit keys in ECB and CBC modes. This hardware accelerator offloads cryptographic operations from the CPU, enabling secure firmware updates, encrypted data logging, and protected communication-critical for IEC60730 Class B compliance and medical or industrial security requirements. The DEU is fully integrated into the R5F521A6BDFM#30's memory map and accessible via standard peripheral registers.

How many analog-to-digital converter channels does the R5F521A6BDFM#30 include, and what are their key specifications?

The R5F521A6BDFM#30 integrates two independent A/D converters: a 24-bit ∆Σ type with 7 total channels (4 differential + 3 single-ended), SNDR = 85 dB, and minimum conversion time of 81.92 μs; and a 10-bit SAR-type with 7 channels and 2.0 μs conversion time per channel. Both support self-diagnostic functions and analog input disconnection detection. The ∆Σ module includes programmable PGA gain (×1–×64 differential, ×1–×4 single-ended) and factory-calibrated gain/impedance registers for precision metrology applications.

What package type and pin count does the R5F521A6BDFM#30 use, and is it RoHS-compliant?

The R5F521A6BDFM#30 uses the PLQP0064KB-A package: a 64-pin LQFP measuring 10 mm × 10 mm with 0.5 mm pitch. It is RoHS-compliant and lead-free, meeting JEDEC J-STD-020 moisture sensitivity level 3 (MSL3). This package provides 38 general-purpose I/O pins, with 6 pins rated for 5-V tolerance and 28 supporting open-drain operation-optimized for compact industrial control and sensor interface designs where board space is constrained.

Can the R5F521A6BDFM#30 operate in low-power modes while retaining real-time clock functionality?

Yes, the R5F521A6BDFM#30 supports deep software standby mode, where the CPU, flash, and most peripherals are powered down while the RTC remains fully operational using the 32.768 kHz sub-clock oscillator. In this mode, the device consumes minimal current and can be awakened by RTC alarms, external pin events (RTCIC0–RTCIC2), or the independent watchdog timer. This capability is essential for battery-powered meters and sensors requiring accurate timekeeping and infrequent wake-up intervals without compromising power budget.