Renesas R5F101MJAFA#V0

Overview

R5F101MJAFA#V0 from Renesas is an RL78/G13 80-pin LQFP-0.65mm microcontroller with 128 KB flash, 12 KB RAM, and no data flash memory, designed for ultra-low-power embedded control in industrial temperature range (–40°C to +85°C). It delivers 41 DMIPS at 32 MHz, consumes 66 μA/MHz active current and 0.57 μA in RTC+LVD-only mode, and integrates 16-bit timers, 10-bit ADC (26 channels), UART, I²C, CSI, RTC, and hardware multiplier/divider.

For engineers reviewing the R5F101MJAFA#V0 datasheet, R5F101MJAFA#V0 pinout, R5F101MJAFA#V0 application, or R5F101MJAFA#V0 equivalent, key selection considerations include its 80-pin LQFP package, absence of on-chip data flash, industrial-grade operating temperature, and support for background data flash programming via external library - critical for firmware updates in field-deployed equipment.

Technical Context

The R5F101MJAFA#V0 implements the RL78 CPU core with a 3-stage pipeline CISC architecture, supporting instruction execution times from 0.03125 μs (32 MHz high-speed mode) to 30.5 μs (32.768 kHz subsystem clock). It features dual-clock domains: a main high-speed oscillator (selectable up to 32 MHz ±1.0%) and a dedicated low-speed on-chip oscillator for watchdog and RTC operation.

Its peripheral set includes eight 16-bit timers, one 12-bit interval timer, one calendar RTC with alarm and correction, one watchdog timer, and three serial interfaces (CSI, UART/LIN, I²C) configurable across multiple channels. The 10-bit A/D converter supports up to 26 analog inputs with internal 1.45 V reference and integrated temperature sensor.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (14 × 14 mm, 0.65-mm pitch), RoHS-compliant, tray packaging (#V0).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F101MJAFA#V0, the R5F100MJAFA#V0 adds data flash for robust parameter logging, while R5F101MJAFB#V0 trades package manufacturability for board density - making the original LQFP-0.65mm variant optimal for cost-sensitive industrial production.

Availability

R5F101MJAFA#V0 is available at Aetrix Electronics and suitable for smart metering, industrial I/O modules, HVAC controllers, and white goods motor control requiring stable component supply across multi-year production cycles.

Supply support for R5F101MJAFA#V0 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 RL78/G13 family targets cost-sensitive, ultra-low-power general-purpose embedded control - balancing performance, energy efficiency, and peripheral richness for appliances, meters, and factory equipment.

FAQ

Does R5F101MJAFA#V0 include on-chip data flash memory?

No, R5F101MJAFA#V0 does not include on-chip data flash memory. Unlike the R5F100x series, the R5F101x variants omit data flash to reduce cost and die size. Designers must use external nonvolatile memory (e.g., I²C EEPROM or SPI flash) for storing calibration data, configuration parameters, or event logs. The R5F101MJAFA#V0 retains full code flash (128 KB) and RAM (12 KB) functionality.

What is the maximum operating frequency and associated performance of R5F101MJAFA#V0?

R5F101MJAFA#V0 operates at up to 32 MHz using the high-speed on-chip oscillator, delivering 41 DMIPS of processing performance. Its RL78 CPU core achieves this with a 3-stage pipeline and supports dynamic clock switching between high-speed (32 MHz) and ultra-low-speed (32.768 kHz) modes - enabling precise timing control while minimizing active power consumption during burst-mode operation.

Which package type and pin count does R5F101MJAFA#V0 use?

R5F101MJAFA#V0 uses an 80-pin LQFP package with 0.65 mm pitch (JEDEC MS-026), designated by the "FA" suffix and "#V0" tray packaging code. This package is compatible with standard surface-mount assembly processes and offers full access to all 80 I/O pins, including 26 analog-capable inputs, multiple serial interfaces, and dedicated timer/capture channels - ideal for medium-complexity industrial control applications.

Can R5F101MJAFA#V0 operate across industrial temperature ranges?

Yes, R5F101MJAFA#V0 is rated for industrial ambient temperature operation from –40°C to +85°C (denoted by "D" grade in Renesas part numbering). It includes on-chip voltage detector (LVD) with 14 selectable threshold levels and power-on-reset (POR) circuitry - ensuring reliable startup and brown-out recovery in harsh factory or outdoor environments where thermal and supply voltage stability are critical.

What debug interface does R5F101MJAFA#V0 support?

R5F101MJAFA#V0 supports Renesas' single-wire debug (SWD) interface via the TOOLnTRST pin (P50), enabling full on-chip debugging, flash programming, and real-time trace without requiring a dedicated debug header. This reduces PCB footprint and simplifies production programming. No JTAG TAP controller is present; debug capability is integrated directly into the RL78 core and accessed through the standard E2 studio IDE and Renesas Flash Programmer tools.