Renesas R5F3651RDFC#UA

Overview

R5F3651RDFC#UA from Renesas is a 16-bit M16C/65 Group microcontroller featuring 128 KB on-chip Flash ROM, 8 KB RAM, and integrated 10-bit ADC (26 channels), dual 8-bit DACs, and advanced timer subsystem including 11-channel 16-bit timers with PWM, input capture, and event counting. It operates at up to 50 MHz across 3.0–5.5 V and targets real-time motor control and industrial I/O modules.

For engineers reviewing the R5F3651RDFC#UA datasheet, R5F3651RDFC#UA pinout, R5F3651RDFC#UA application, or R5F3651RDFC#UA equivalent, key selection criteria include its M16C/65 core architecture, PLQP0100KB-A 100-pin LQFP package, 50 MHz max frequency, 10-bit × 26-channel ADC with sample-and-hold, dual 8-bit DACs, and support for UART, I²C, and intelligent I/O peripherals in harsh-temperature industrial environments.

Technical Context

The R5F3651RDFC#UA implements the M16C/65 CPU core with 108 basic instructions and 20 ns minimum instruction execution time at 50 MHz. It integrates DMACII for peripheral-triggered data transfers and a four-circuit clock generation system supporting main clock, PLL, subclock, and on-chip oscillator with oscillation stop detection.

It includes dedicated hardware for motor control: 3-phase inverter control logic, dead-time insertion shared across TimerA4/A1/A2/B2, and 2-phase encoder input capability. Voltage monitoring comprises POR and LVD with low-voltage detection functionality.

Key Specifications

Pinout & Package

Package: PLQP0100KB-A - 100-pin plastic quad flat package (LQFP), 14 mm × 14 mm, 0.5 mm pitch, exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F3651RDFC#UA, R5F64175DFB offers greater memory headroom for feature-rich firmware, while R5F64165DFB adds robust I/O voltage flexibility and enhanced serial bus capability-both retain pin compatibility and identical peripheral sets for seamless migration.

Availability

R5F3651RDFC#UA is available at Aetrix Electronics and suitable for industrial motor drives, factory automation I/O modules, and building management controllers requiring stable component supply across extended product lifecycles.

Supply support for R5F3651RDFC#UA 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 markets.

The M16C/65 Group, including R5F3651RDFC#UA, was engineered for deterministic real-time control in resource-constrained industrial equipment, emphasizing analog integration, motor timing precision, and long-term manufacturability.

FAQ

What is the maximum operating frequency of the R5F3651RDFC#UA?

The R5F3651RDFC#UA operates at a maximum frequency of 50 MHz. This speed is achieved using the on-chip PLL with an external crystal or the internal oscillator. At this rate, the M16C/65 core delivers 20 ns minimum instruction execution time, enabling tight control loop timing for motor and power applications. The R5F3651RDFC#UA maintains full peripheral functionality-including ADC sampling, PWM updates, and UART transmission-at this rated frequency.

Does the R5F3651RDFC#UA support hardware-based 3-phase inverter control?

Yes, the R5F3651RDFC#UA includes dedicated hardware for 3-phase inverter control, including dead-time insertion logic shared across TimerA4, TimerA1, TimerA2, and TimerB2. This allows precise, jitter-free generation of complementary PWM signals for gate drivers. The R5F3651RDFC#UA also supports 2-phase encoder input and event counting, making it suitable for position-sensored motor commutation without external logic.

How many ADC channels does the R5F3651RDFC#UA have, and do they support simultaneous sampling?

The R5F3651RDFC#UA features a 10-bit ADC with 26 input channels and integrated sample-and-hold circuitry. While true simultaneous sampling across all channels is not supported, the ADC can execute rapid sequential conversions with minimal inter-channel delay, and the sample-and-hold ensures accurate capture during switching transients. This capability is fully utilized in the R5F3651RDFC#UA's motor control applications for phase current and DC-link voltage monitoring.

Is the R5F3651RDFC#UA pin-compatible with other M16C/65 Group devices?

Yes, the R5F3651RDFC#UA uses the PLQP0100KB-A 100-pin LQFP package and shares identical pin mapping with other M16C/65 Group members in that package, including R5F64175DFB and R5F64165DFB. Signal names, power domains, and peripheral pin assignments are consistent, enabling drop-in replacement where memory or feature requirements align. Always verify clock, reset, and decoupling design per the specific variant's datasheet.

What development tools are officially supported for the R5F3651RDFC#UA?

Renesas provides official support for the R5F3651RDFC#UA through the HEW (High-performance Embedded Workshop) IDE and the E8a/E10A-USB debug emulators. These tools enable full C/C++ debugging, Flash programming, and real-time trace. The R5F3651RDFC#UA is also compatible with Renesas' standard M16C/65 Group evaluation boards and peripheral driver libraries. No third-party toolchain certification is required-the R5F3651RDFC#UA works natively within Renesas' validated ecosystem.