Renesas R7FA2E1A73CFK#AA0

Overview

R7FA2E1A73CFK#AA0 from Renesas is an ultra-low-power 32-bit Arm® Cortex®-M23 microcontroller operating at up to 48 MHz, featuring 64-KB code flash, 16-KB SRAM, a 12-bit ADC, Capacitive Sensing Unit (CTSU2), and integrated security (AES128/256, TRNG) for battery-powered HMI and industrial sensor nodes.

For engineers reviewing the R7FA2E1A73CFK#AA0 datasheet, R7FA2E1A73CFK#AA0 pinout, R7FA2E1A73CFK#AA0 application, or R7FA2E1A73CFK#AA0 equivalent, key selection criteria include its 64-pin LQFP-0.8 mm pitch package, -40°C to +105°C industrial temperature grade, CTSU2-based touch interface support, and dual watchdog timers (WDT/IWDT) with independent clock sources.

Technical Context

The R7FA2E1A73CFK#AA0 implements the Armv8-M architecture with Memory Protection Unit (MPU) supporting 8 regions, enabling secure partitioning of firmware and data in resource-constrained embedded systems. Its system-level timing relies on multiple clock sources including HOCO (48 MHz), SOSC (32.768 kHz), and IWDT-dedicated 15-kHz oscillator.

Peripheral integration centers on event-driven operation: the Event Link Controller (ELC) enables direct hardware-to-hardware triggering between modules (e.g., ADC conversion start → DTC transfer), while the Data Transfer Controller (DTC) offloads CPU during memory-mapped transfers. Safety is enforced via SRAM parity checking, flash area protection, and CAC-based clock accuracy monitoring.

Key Specifications

Pinout & Package

Package: 64-pin LQFP (14 mm × 14 mm, 0.8 mm pitch), RoHS-compliant Sn finish, exposed pad recommended to be connected to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R7FA2E1A93CFK#AA0, the R7FA2E1A73CFK#AA0 reduces flash capacity to lower unit cost while retaining identical peripheral sets and safety features; versus STM32L552RET6, it delivers purpose-built capacitive touch and lower-voltage operation at smaller footprint and reduced software stack complexity.

Availability

R7FA2E1A73CFK#AA0 is available at Aetrix Electronics and suitable for smart home interfaces, industrial sensor nodes, and medical wearable patches requiring stable component supply across extended product lifecycles.

Supply support for R7FA2E1A73CFK#AA0 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, power, and SoC solutions for automotive, industrial, and IoT markets.

The RA2E1 group targets cost-sensitive, ultra-low-power embedded applications, emphasizing integrated human-machine interface (CTSU2), security (AES/TRNG), and functional safety (CAC, SRAM parity) in compact packages.

FAQ

What is the maximum operating frequency of the R7FA2E1A73CFK#AA0?

The R7FA2E1A73CFK#AA0 operates at a maximum frequency of 48 MHz using its Arm Cortex-M23 core. This speed is achievable with the high-speed on-chip oscillator (HOCO) or external crystal (MOSC), and is maintained across the full industrial temperature range (-40°C to +105°C). The R7FA2E1A73CFK#AA0 includes clock accuracy measurement (CAC) to verify stability under varying conditions.

Does the R7FA2E1A73CFK#AA0 support capacitive touch sensing?

Yes, the R7FA2E1A73CFK#AA0 integrates the Capacitive Sensing Unit version 2 (CTSU2), supporting up to 20 touch pins (e.g., TS00, TS02-CFC, TS04–TS07) in its 64-pin LQFP package. It provides both self- and mutual-capacitance measurement modes with built-in noise cancellation, enabling robust button, slider, and proximity detection without external components. The R7FA2E1A73CFK#AA0's CTSU2 is fully configurable via firmware and requires no external RC networks.

What security features are implemented in the R7FA2E1A73CFK#AA0?

The R7FA2E1A73CFK#AA0 includes AES128/256 encryption engines and a True Random Number Generator (TRNG) for cryptographic key generation and data protection. It also supports secure boot via flash area protection and register write protection (PRCR). These features are complemented by safety mechanisms such as SRAM parity checking and Clock Frequency Accuracy Measurement (CAC), all designed to meet IEC 61508 SIL2 and ISO 26262 ASIL-B readiness requirements. The R7FA2E1A73CFK#AA0 does not include a dedicated secure element but provides foundational hardware security primitives.

Which debug interface does the R7FA2E1A73CFK#AA0 use?

The R7FA2E1A73CFK#AA0 uses Serial Wire Debug (SWD) with two dedicated pins: SWDIO (pin P108) and SWCLK (pin P300). This 2-pin interface supports full JTAG-equivalent functionality including halt/resume, register read/write, flash programming, and real-time memory access. It is compatible with standard ARM debug probes (e.g., J-Link, CMSIS-DAP) and Renesas E2 studio IDE. No additional debug circuitry or level-shifting is required for the R7FA2E1A73CFK#AA0.

What is the operating voltage range for the R7FA2E1A73CFK#AA0?

The R7FA2E1A73CFK#AA0 operates from 1.6 V to 5.5 V on its VCC supply, enabling direct interfacing with 1.8-V, 3.3-V, and 5-V logic domains without level shifters. Its analog peripherals (ADC12, ACMPLP, TSN) remain functional across this full range, and the Low Voltage Detection (LVD) module provides programmable thresholds (LVD0/LVD1/LVD2) to trigger safe shutdown or warning interrupts. This wide voltage tolerance makes the R7FA2E1A73CFK#AA0 ideal for battery-powered and mixed-voltage industrial systems.