Renesas R5F521A7BDFP#30

Overview

R5F521A7BDFP 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 precision metering systems.

For engineers reviewing the R5F521A7BDFP datasheet, R5F521A7BDFP pinout, R5F521A7BDFP application, or R5F521A7BDFP equivalent, key selection criteria include its 100-pin LQFP package (PLQP0100KB-A), −40°C to +85°C temperature grade, 24-bit ∆Σ ADC resolution for current/voltage sensing, integrated ELC for event-driven peripheral operation without CPU intervention, and IEC60730-compliant self-diagnostic features for safety-critical firmware.

Technical Context

The R5F521A7BDFP implements the 32-bit RXv1 CPU core with CISC Harvard architecture, 5-stage pipeline, and variable-length instructions enabling ultra-compact code. Its memory protection unit (MPU) supports secure embedded execution, while the on-chip debugging circuit enables FINE interface-based development with the E1 emulator.

It features dual clock domains: system clock (ICLK) up to 50 MHz for CPU and bus masters, and peripheral clock (PCLK) up to 25 MHz for timers, ADCs, and communication modules. The ELC routes 69 event signals directly to peripherals, allowing timer-triggered ADC conversions or PWM updates during CPU sleep - critical for low-power sensor node operation.

Key Specifications

Pinout & Package

Package: PLQP0100KB-A - 100-pin LQFP, 14 × 14 mm body, 0.5 mm pitch, exposed pad not specified, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F521A7BDFP, R5F521A8BDFP offers headroom for feature-rich firmware while maintaining identical peripheral compatibility, whereas R5F521A7BGFP provides thermal robustness without functional change - both require no PCB redesign but differ in cost and qualification scope.

Availability

R5F521A7BDFP is available at Aetrix Electronics and suitable for industrial energy metering, smart grid sensor nodes, medical patient monitor front-ends, and industrial process controllers requiring stable component supply across multi-year production cycles.

Supply support for R5F521A7BDFP 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 applications.

The RX21A Group targets high-precision analog-intensive embedded systems - specifically designed for metrology, sensor signal conditioning, and safety-certifiable control where 24-bit ∆Σ ADC performance, low-power operation, and IEC60730 compliance are essential.

FAQ

What is the maximum operating frequency and CPU performance of the R5F521A7BDFP?

The R5F521A7BDFP 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 variable-length instruction set. Its 384 KB on-chip flash executes code with zero wait states at full speed, enabling deterministic real-time response in metrology and control applications where R5F521A7BDFP is deployed.

Does the R5F521A7BDFP support IEC60730 functional safety compliance?

Yes, the R5F521A7BDFP includes dedicated hardware features for IEC60730 Class B compliance, including self-diagnostic routines for the 24-bit ∆Σ A/D converter, clock accuracy measurement circuit (CAC), independent watchdog timer (IWDT), RAM test assist, and analog input disconnection detection. These capabilities are documented in the RX21A Group User's Manual and enable certified firmware implementations without external safety monitors - a key advantage of R5F521A7BDFP in safety-critical designs.

What analog peripherals are integrated into the R5F521A7BDFP?

The R5F521A7BDFP integrates three distinct analog subsystems: a 24-bit ∆Σ A/D converter with 7 channels (4 differential, 3 single-ended), a 10-bit successive-approximation A/D converter with 7 channels and 2.0 μs conversion time, and two 10-bit D/A converters. It also includes two 2-channel analog comparators (CMPA/CMPB), a temperature sensor, and programmable gain amplifiers (PGA) with calibrated gain settings up to ×64 - all accessible without external components in R5F521A7BDFP-based signal chains.

How does the Event Link Controller (ELC) enhance real-time performance in the R5F521A7BDFP?

The ELC in the R5F521A7BDFP enables 69 types of hardware events - such as timer overflows or external pin transitions - to directly trigger peripheral operations (e.g., ADC conversion start, PWM update, or DTC transfer) without CPU intervention or interrupt latency. This allows the CPU to remain in low-power sleep modes while maintaining precise, deterministic timing - a critical capability for battery-operated sensor nodes and R5F521A7BDFP-based energy meters requiring continuous background sampling.

What package and pin count does the R5F521A7BDFP use?

The R5F521A7BDFP uses the PLQP0100KB-A package: a 100-pin LQFP with 14 × 14 mm body size and 0.5 mm pitch. It provides 66 general-purpose I/O pins, including 47 open-drain outputs and 6 5-V tolerant inputs. Pin assignments are fixed per the Renesas datasheet, and this package variant supports the full peripheral complement of the RX21A Group - making it the highest-function option among R5F521A7BDFP variants.