Renesas R5F3640MDFB#UZ

Overview

R5F3640MDFB#UZ from Renesas Electronics is a 16-bit CMOS microcontroller in the M16C/64 Group, designed for embedded control in industrial and consumer systems. It integrates 256 KB flash memory, 16 KB RAM, a 16-bit CPU core, on-chip debug support, and peripherals including UART, I²C, PWM timers, and 10-bit ADC. It operates at up to 20 MHz with supply voltage range 2.7–5.5 V.

For engineers reviewing the R5F3640MDFB#UZ datasheet, R5F3640MDFB#UZ pinout, R5F3640MDFB#UZ application, or R5F3640MDFB#UZ equivalent, key selection criteria include its 100-pin LQFP package, 256 KB on-chip flash with EEPROM emulation, 10-bit 12-channel ADC, dual UART with IrDA support, and compliance with industrial-grade reliability standards per Renesas' "Standard" quality grade classification.

Technical Context

The R5F3640MDFB#UZ implements the M16C CPU architecture with 16-bit data bus and 24-bit address space, supporting both single-cycle and multi-cycle instruction execution. Its memory subsystem includes 256 KB of on-chip flash (with 100,000 write/erase cycles), 16 KB RAM, and boot ROM with on-chip debug ROM.

Peripherals are tightly coupled via an internal bus matrix: dual UARTs support asynchronous communication with selectable baud rates and framing; a 16-bit timer array provides PWM output, input capture, and interval timing; and the 10-bit ADC features sample-and-hold, programmable conversion start triggers, and scan mode across 12 analog inputs.

Key Specifications

Pinout & Package

This device is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad, suitable for surface-mount reflow assembly and industrial thermal environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F3640MDFB#UZ, the R5F3640MDFP#U0 offers identical functionality with RoHS-compliant packaging, while the R5F3650MDFB#UZ doubles flash capacity without altering I/O or timing behavior - enabling seamless migration paths within the same PCB layout.

Availability

R5F3640MDFB#UZ is available at Aetrix Electronics and suitable for industrial motor control, home appliance MCU, factory automation I/O modules, and smart HVAC controllers requiring stable component supply and long-term production continuity.

Supply support for R5F3640MDFB#UZ 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 Japan, specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The R5F3640MDFB#UZ belongs to the M16C/64 Group - a mature 16-bit MCU family engineered for deterministic real-time control in cost-sensitive, thermally constrained industrial and white-goods applications.

FAQ

What is the maximum operating frequency of the R5F3640MDFB#UZ?

The R5F3640MDFB#UZ operates at a maximum CPU clock frequency of 20 MHz. This is achieved using an external crystal (1–20 MHz) connected to XT1/XT2 pins, or via internal oscillator with PLL multiplication. The 20 MHz rating applies across the full industrial temperature range (−40°C to +85°C) and supply voltage range (2.7–5.5 V), as verified in Renesas' REJ03B0216 datasheet and M16C/64 Group Hardware Manual Rev.1.05.

Does the R5F3640MDFB#UZ support in-circuit debugging without external hardware?

Yes, the R5F3640MDFB#UZ includes an on-chip debug interface compliant with Renesas' standard debug protocol. It supports full in-circuit debugging - including breakpoints, single-stepping, register and memory inspection - using only a 6-pin debug connector and compatible Renesas E8/E8a emulator or modern third-party debug adapters. No external ICE or target socket is required, as confirmed in Section 1.1.1 and Chapter 5 of the M16C/64 Group Hardware Manual.

How many analog input channels does the ADC in the R5F3640MDFB#UZ support?

The R5F3640MDFB#UZ integrates a 10-bit successive-approximation ADC with 12 dedicated analog input channels (AN0 through AN11), mapped to Port 2 pins P2_0–P2_7 and Port 3 pins P3_0–P3_3. All channels share a common sample-and-hold circuit and support hardware-triggered conversion sequences, as detailed in Section 10.3.2 of the M16C/64 Group Hardware Manual and confirmed in the REJ03B0216 datasheet.

Is the R5F3640MDFB#UZ qualified for automotive applications?

No, the R5F3640MDFB#UZ is classified under Renesas' "Standard" quality grade and is not qualified for automotive use. Per Renesas documentation (including Quality Grade Notice in M16C/64 Group Hardware Manual Rev.1.05), it is intended for computers, office equipment, industrial robots, and home appliances - not transportation equipment or safety-critical systems. Automotive-grade alternatives require explicit "High Quality" designation and AEC-Q100 qualification, which this part lacks.

What package type and pin count does the R5F3640MDFB#UZ use?

The R5F3640MDFB#UZ uses a 100-pin LQFP (Low-profile Quad Flat Package) with 14 mm × 14 mm body size and 0.5 mm pin pitch. It includes an exposed thermal pad on the underside for enhanced heat dissipation. Pin assignments and mechanical dimensions are fully specified in Section 1.5 ("Pin Assignments") and Section 1.6 ("Pin Functions") of the M16C/64 Group Hardware Manual Rev.1.05.