Renesas R5F521A7BDFM#V0

Overview

R5F521A7BDFM#V0 from Renesas Electronics is a 32-bit RX CPU-based microcontroller with 384 KB on-chip flash, 64 KB SRAM, and 8 KB data flash, operating at up to 50 MHz (78 DMIPS). 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 IrDA support via SCI5 - deployed in industrial sensor signal conditioning and energy metering systems.

For engineers reviewing the R5F521A7BDFM#V0 datasheet, R5F521A7BDFM#V0 pinout, R5F521A7BDFM#V0 application, or R5F521A7BDFM#V0 equivalent, key selection criteria include its 64-pin LQFP (PLQP0064KB-A) package, −40°C to +85°C temperature grade, 24-bit ∆Σ A/D PGA gain scaling (×1–×64), ELC-triggered peripheral operation, and IEC60730-compliant self-test features for safety-critical embedded control.

Technical Context

The R5F521A7BDFM#V0 implements the RXv1 CPU core with CISC Harvard architecture, 5-stage pipeline, and memory protection unit (MPU), enabling deterministic real-time execution at 50 MHz. Its clock system includes PLL (4–12.5 MHz input), sub-clock oscillator (32.768 kHz), and dedicated IWDT oscillator (125 kHz), with independent ICLK/PCLK/FCLK domains for CPU, peripherals, and FlashIF.

Peripheral integration centers on event-driven operation: the Event Link Controller (ELC) supports 69 event sources to trigger MTU2, ADC, or DTC without CPU intervention, while the Multi-function Pin Controller (MPC) enables flexible I/O function remapping across 38 GPIO pins in the 64-pin package.

Key Specifications

Pinout & Package

Package: PLQP0064KB-A - 64-pin LQFP, 10 × 10 mm body, 0.5 mm pitch, exposed pad not specified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F521A7BDFM#V0, R5F521A7BDFP offers higher I/O and peripheral density at larger footprint cost, while R5F521A6BDFM reduces memory capacity without sacrificing analog resolution or security - enabling tiered product variants from a common hardware platform.

Availability

R5F521A7BDFM#V0 is available at Aetrix Electronics and suitable for industrial energy metering, smart grid sensor nodes, motor control feedback units, and medical diagnostic instruments requiring stable component supply across extended product lifecycles.

Supply support for R5F521A7BDFM#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 is a global semiconductor leader specializing in microcontrollers, analog, and power solutions for automotive, industrial, and IoT applications.

The RX21A Group, including R5F521A7BDFM#V0, was designed for high-precision analog-intensive embedded control - targeting energy metering, industrial automation, and medical devices requiring integrated 24-bit ∆Σ A/D, hardware crypto, and functional safety support.

FAQ

What is the maximum operating frequency and CPU performance of the R5F521A7BDFM#V0?

The R5F521A7BDFM#V0 operates at a maximum frequency of 50 MHz, delivering 78 DMIPS of processing performance. This is achieved using the 32-bit RXv1 CPU core with a 5-stage pipeline and ultra-compact variable-length instruction set. The MCU sustains full-speed operation across its 1.8–3.6 V supply range, with no wait states on flash or SRAM access at 50 MHz - enabling deterministic real-time execution for control loops and signal processing tasks in the R5F521A7BDFM#V0.

Does the R5F521A7BDFM#V0 support hardware-accelerated cryptography?

Yes, the R5F521A7BDFM#V0 includes a dedicated Data Encryption Unit (DEU) that performs AES encryption and decryption in hardware. It supports 128-, 192-, and 256-bit key lengths in both ECB and CBC modes. This offloads cryptographic operations from the CPU, enabling secure boot, encrypted firmware updates, and protected data storage - critical for IEC60730 compliance and HIPAA-aligned medical applications using the R5F521A7BDFM#V0.

How many analog-to-digital converter channels does the R5F521A7BDFM#V0 integrate, and what are their key specifications?

The R5F521A7BDFM#V0 integrates two independent A/D converters: a 24-bit delta-sigma (ΔΣ) unit with 7 channels (4 differential + 3 single-ended) and SNDR = 85 dB, plus a 10-bit successive-approximation (SAR) unit with 7 channels and 2.0 μs conversion time. The ΔΣ unit supports programmable PGA gain (×1–×64 on differential inputs), while both units include self-diagnostic and analog input disconnection detection - making the R5F521A7BDFM#V0 suitable for precision metering and sensor conditioning.

What low-power modes are available on the R5F521A7BDFM#V0, and which peripherals remain active during deep software standby?

The R5F521A7BDFM#V0 supports four low-power modes, including deep software standby - where CPU, flash, and most peripherals halt while the RTC remains fully operational. In this mode, the RTC can generate alarms or respond to external event inputs (RTCIC0–RTCIC2) to wake the system. The 32.768 kHz sub-clock oscillator continues running, and the IWDT remains functional. This enables ultra-low-power operation in battery-backed metering and sensor applications using the R5F521A7BDFM#V0.

Is the R5F521A7BDFM#V0 pin-compatible with other members of the RX21A Group?

No, the R5F521A7BDFM#V0 is not universally pin-compatible across the RX21A Group. It uses the 64-pin LQFP (PLQP0064KB-A) package, which has 38 GPIO and a reduced peripheral set compared to the 100-pin (R5F521A7BDFP) and 80-pin variants. While pin functions are consistent within the same package type, migration between package sizes requires PCB redesign. Always verify pin assignments and peripheral availability in Table 1.2 of the R5F521A7BDFM#V0 datasheet before substituting.