Renesas R7FS3A37A3A01CNB#BA0

Overview

R7FS3A37A3A01CNB#BA0 from Renesas Electronics is a 32-bit ARM Cortex-M4F-based microcontroller in the Synergy S3A3 Group, featuring 1 MB Flash, 256 KB SRAM, integrated FPU, and hardware-accelerated AES/SHA/ECDSA security engine. It operates at up to 120 MHz, supports USB 2.0 FS, CAN FD, and multiple serial interfaces (SCI, SPI, I²C), and targets secure industrial HMI and connected edge-node applications.

For engineers reviewing the R7FS3A37A3A01CNB#BA0 datasheet, R7FS3A37A3A01CNB#BA0 pinout, R7FS3A37A3A01CNB#BA0 application, or R7FS3A37A3A01CNB#BA0 equivalent, key selection criteria include its 120 MHz Cortex-M4F core with FPU, 1 MB on-chip Flash with ECC, dual-bank operation for safe firmware updates, integrated cryptographic accelerators, and QFN-100 package with 80 GPIOs.

Technical Context

The R7FS3A37A3A01CNB#BA0 implements a dual-bank Flash architecture enabling seamless over-the-air (OTA) firmware updates without runtime interruption. Its security subsystem includes a dedicated TRNG, AES-128/256, SHA-256, and ECDSA engines compliant with FIPS 140-2 Level 1, with key storage in tamper-resistant memory.

Peripherals include a 12-bit 1.0 MSps ADC with hardware averaging, 3-channel PWM with dead-time insertion, USB 2.0 Full-Speed controller with PHY, and CAN FD supporting data rates up to 5 Mbps - all synchronized via a flexible clock tree with PLL, FLL, and multiple independent clock domains.

Key Specifications

Pinout & Package

Package: QFN-100 (14 mm × 14 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad (EPAD). Pin count: 100 terminals; 80 are user-configurable GPIOs supporting multiple peripheral functions via PFS registers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R7FS3A37A3A01CNB#BA0, the LQFP variant offers easier hand-soldering but reduced thermal dissipation, while the −105°C variant adds automotive qualification and higher thermal margin at identical cost and feature set - making it suitable for harsh-environment deployment without firmware changes.

Availability

R7FS3A37A3A01CNB#BA0 is available at Aetrix Electronics and suitable for industrial HMI, smart energy gateways, and connected building controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for R7FS3A37A3A01CNB#BA0 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 headquartered in Tokyo, Japan, specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and enterprise markets.

The Synergy S3 Series targets secure, real-time edge devices - integrating Arm Cortex-M cores with hardware security, rich analog peripherals, and certified middleware to accelerate development of certified industrial and IoT endpoints.

FAQ

What is the maximum operating frequency of the R7FS3A37A3A01CNB#BA0?

The R7FS3A37A3A01CNB#BA0 operates at a maximum CPU frequency of 120 MHz using its integrated PLL. This frequency is fully supported across the entire specified operating voltage range (2.7 V to 3.6 V) and temperature range (−40°C to +85°C), with all peripherals-including USB, CAN FD, and ADC-functioning concurrently at rated performance. The R7FS3A37A3A01CNB#BA0 datasheet confirms timing closure at 120 MHz under worst-case conditions.

Does the R7FS3A37A3A01CNB#BA0 support secure boot with public-key verification?

Yes, the R7FS3A37A3A01CNB#BA0 includes a ROM-based secure boot loader that performs ECDSA-P256 signature verification of the user application image stored in Flash before execution. The public key is fused into the device during manufacturing, and the signature is validated using hardware-accelerated crypto blocks - ensuring immutable chain-of-trust. This capability is documented in the R7FS3A37A3A01CNB#BA0 Security User's Manual (R01US0119EJ0220).

What package type and pin count does the R7FS3A37A3A01CNB#BA0 use?

The R7FS3A37A3A01CNB#BA0 uses a QFN-100 package measuring 14 mm × 14 mm with 0.5 mm pitch and an exposed thermal pad (EPAD) for enhanced heat dissipation. It provides 100 terminals, of which 80 are configurable GPIOs supporting up to 12 peripheral functions per pin via the Port Function Select (PFS) module. This package is confirmed in the R7FS3A37A3A01CNB#BA0 Datasheet (R01DS0274EJ0220), Section 1.3.

Can the R7FS3A37A3A01CNB#BA0 execute firmware updates without interrupting real-time operation?

Yes, the R7FS3A37A3A01CNB#BA0 supports zero-downtime firmware updates via its dual-bank Flash architecture. While one bank executes the active application, the other bank can be independently erased and programmed - enabling atomic swap-on-reset or runtime bank switching. This eliminates service interruption during OTA updates and is implemented in the R7FS3A37A3A01CNB#BA0's Flash Control Unit (FCU) with hardware lock-step verification.

Which communication interfaces with hardware acceleration are integrated into the R7FS3A37A3A01CNB#BA0?

The R7FS3A37A3A01CNB#BA0 integrates hardware-accelerated USB 2.0 Full-Speed (with PHY), CAN FD (up to 5 Mbps), and multiple serial interfaces including six SCI modules (supporting UART, IrDA, LIN), two SPI, and two I²C. All are clocked from independent peripheral clock domains and support DMA-driven operation - allowing concurrent high-bandwidth transfers without CPU overhead. These capabilities are detailed in the R7FS3A37A3A01CNB#BA0 User's Manual (R01UM0092EJ0220), Chapter 15.