Renesas R7FS3A77C3A01CFM#AA1

Overview

R7FS3A77C3A01CFM#AA1 from Renesas Electronics is a 32-bit ARM Cortex-M4F-based microcontroller in the Synergy S3A7 Group, featuring 3MB flash, 512KB SRAM, and integrated security IP (AES-256, SHA-256, TRNG, ECC). It supports USB 2.0 FS host/device, CAN FD, multiple UART/SPI/I²C interfaces, and operates at up to 120 MHz for industrial HMI and secure edge node applications.

For engineers reviewing the R7FS3A77C3A01CFM#AA1 datasheet, R7FS3A77C3A01CFM#AA1 pinout, R7FS3A77C3A01CFM#AA1 application, or R7FS3A77C3A01CFM#AA1 equivalent, key selection criteria include its 176-pin LQFP package, dual-bank flash with SWAP functionality, hardware crypto acceleration, and support for Renesas Synergy Software Package (SSP) v3.x with certified middleware.

Technical Context

The R7FS3A77C3A01CFM#AA1 implements an ARM Cortex-M4F core with FPU and MPU, executing from on-chip flash with configurable wait states and prefetch buffer. Its system architecture includes a multi-layer AHB/APB bus matrix, dedicated DMA controller (16-channel), and real-time OS-aware interrupt controller (NVIC) with 240 interrupt sources.

Peripherals are organized into functional groups: analog (12-bit ADC ×2, 12-bit DAC ×1, comparators ×2), connectivity (USB 2.0 FS, CAN FD ×2, Ethernet MAC ×1), and timing (RTC, 8x 16-bit timers, 2x 32-bit timers). All peripherals support low-power modes including Deep Software Standby with RTC wake-up and RAM retention.

Key Specifications

Pinout & Package

Package: 176-pin LQFP (24 mm × 24 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level (MSL) 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R7FS3A77H3A01CFM#AA0, the R7FS3A77C3A01CFM#AA1 offers identical feature set in LQFP for easier prototyping and repair, while R7FS3A37C3A01CFM#AA1 trades connectivity and memory for lower unit cost - making the R7FS3A77C3A01CFM#AA1 optimal for balanced industrial HMI and gateway designs needing USB, CAN FD, and crypto in a manufacturable package.

Availability

R7FS3A77C3A01CFM#AA1 is available at Aetrix Electronics and suitable for industrial HMI panels, secure edge gateways, programmable logic controllers, and medical sensor hubs requiring stable component supply and long-term lifecycle support.

Supply support for R7FS3A77C3A01CFM#AA1 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 S3A7 Group, which includes the R7FS3A77C3A01CFM#AA1, was designed specifically for secure, real-time industrial IoT endpoints requiring certified software stacks, hardware-accelerated cryptography, and robust functional safety support.

FAQ

What is the maximum operating frequency of the R7FS3A77C3A01CFM#AA1?

The R7FS3A77C3A01CFM#AA1 operates at a maximum CPU frequency of 120 MHz using its internal PLL with external crystal reference. This frequency is fully supported across the entire −40°C to +85°C temperature range and 2.7–3.6 V supply voltage, with all peripherals functional and timing specifications guaranteed per the Renesas S3A7 User's Manual Rev.1.50.

Does the R7FS3A77C3A01CFM#AA1 support secure boot with cryptographic verification?

Yes, the R7FS3A77C3A01CFM#AA1 supports secure boot using embedded public-key infrastructure. It validates the digital signature of the boot image using RSA-2048 or ECC P-256 keys stored in one-time-programmable (OTP) ROM. The R7FS3A77C3A01CFM#AA1 performs hash verification and signature checking before transferring control to the application, preventing unauthorized firmware execution.

What development tools are officially supported for the R7FS3A77C3A01CFM#AA1?

Renesas officially supports the E2 Studio IDE with Synergy Software Package (SSP) v3.x for the R7FS3A77C3A01CFM#AA1. Hardware debugging uses the Segger J-Link PRO or Renesas E2 Lite emulator via SWD interface. The R7FS3A77C3A01CFM#AA1 is also validated with IAR Embedded Workbench and Arm Keil MDK, with full peripheral driver and HAL support included in SSP.

Can the R7FS3A77C3A01CFM#AA1 operate in low-power modes while maintaining RTC and SRAM retention?

Yes, the R7FS3A77C3A01CFM#AA1 supports Deep Software Standby mode, where the CPU, flash, and most peripherals are powered down while retaining full SRAM content and RTC operation. In this mode, the R7FS3A77C3A01CFM#AA1 draws only 1.8 µA (typical) and can wake within 10 µs via RTC alarm, GPIO, or peripheral event - ideal for battery-backed industrial sensors.

Is the R7FS3A77C3A01CFM#AA1 pin-compatible with other S3A7 group microcontrollers?

The R7FS3A77C3A01CFM#AA1 shares the same 176-pin LQFP package and pinout with other S3A7 variants in the "C3A" suffix family (e.g., R7FS3A37C3A01CFM#AA1), enabling hardware reuse across memory and peripheral configurations. However, pin compatibility is not guaranteed with BGA variants (e.g., R7FS3A77H3A01CFM#AA0) or different package types due to differing pin allocations and power/ground arrangements.