Renesas R5F101MJAFA#X0

Overview

R5F101MJAFA#X0 from Renesas is an RL78/G13 80-pin LQFP-0.65mm microcontroller with 64 KB flash, 4 KB data flash, 4 KB RAM, 10-bit ADC (16 channels), and real-time clock - designed for low-power industrial control systems operating from 1.6 V to 5.5 V at -40°C to +85°C.

For engineers reviewing the R5F101MJAFA#X0 datasheet, R5F101MJAFA#X0 pinout, R5F101MJAFA#X0 application, or R5F101MJAFA#X0 equivalent, key selection criteria include ultra-low power consumption (66 μA/MHz active, 0.57 μA RTC+LVD mode), integrated LIN-capable UART, hardware multiplier/divider, and on-chip debug support with flash self-programming.

Technical Context

The R5F101MJAFA#X0 implements the RL78 CPU core with 3-stage pipeline CISC architecture, supporting instruction execution times from 0.03125 μs (32 MHz HS mode) to 30.5 μs (32.768 kHz subsystem clock). It integrates a 12-bit interval timer, calendar-based RTC with alarm and correction, and watchdog timer with dedicated low-speed oscillator.

Power management includes HALT, STOP, and SNOOZE modes, on-chip POR and 14-level LVD, and DMA controller with 4 channels enabling 2-clock transfers between SFR and RAM. Serial interfaces comprise up to 4 UART/LIN channels, 10 I²C/Simplified I²C channels, and 8 CSI (SPI-compatible) channels.

Key Specifications

Pinout & Package

80-pin LQFP package (PLQP0080JB-E) with 0.65 mm pitch, 14 mm × 14 mm body, and exposed pad for thermal dissipation. Pin functions include 64 general-purpose I/O ports (N-ch open drain, TTL input, pull-up configurable), multiple serial interface pins (UART0/1, I²C0/1/2, CSI0–7), and dedicated analog inputs (ANI0–15), reset, clock, and power pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F101MJAFB#X0 and R5F101LJAFA#X0, the R5F101MJAFA#X0 offers optimal balance of I/O count, serial interface density, and standard LQFP manufacturability - making it ideal for new industrial designs requiring full peripheral access without package migration risk.

Availability

R5F101MJAFA#X0 is available at Aetrix Electronics and suitable for smart energy meters, industrial PLC I/O modules, and home appliance control panels requiring stable component supply across extended product lifecycles.

Supply support for R5F101MJAFA#X0 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 delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT markets.

The RL78/G13 family targets cost-sensitive, ultra-low-power general-purpose applications - emphasizing energy efficiency, integrated analog peripherals, and rapid development with scalable memory and pin options.

FAQ

What is the maximum operating frequency and corresponding current consumption of the R5F101MJAFA#X0?

The R5F101MJAFA#X0 operates at up to 32 MHz using its high-speed on-chip oscillator with ±1.0% accuracy. At this frequency, active current consumption is 66 μA per MHz, resulting in approximately 2.1 mA total at 32 MHz with typical peripheral enablement. In STOP mode with only RTC and LVD active, current drops to 0.57 μA - verified per R01DS0131EJ0380 Rev.3.80 specifications.

Does the R5F101MJAFA#X0 include data flash memory, and what are its endurance and voltage requirements?

Yes, the R5F101MJAFA#X0 includes 4 KB of data flash memory. It supports 1,000,000 write/erase cycles (typical) and allows reprogramming at supply voltages from 1.8 V to 5.5 V. Background operation (BGO) enables concurrent program execution and data flash rewriting - critical for logging or over-the-air update functionality in the R5F101MJAFA#X0.

How many analog input channels does the R5F101MJAFA#X0 support, and what ADC resolution and reference options are available?

The R5F101MJAFA#X0 supports 16 analog input channels with 10-bit resolution. It provides internal 1.45 V reference voltage and on-die temperature sensor (usable only in HS mode). External reference inputs AVREFP/AVREFM are available on pins P13/P14 for precision differential measurements - all confirmed in the R5F101MJAFA#X0 datasheet section 1.1 Features.

What serial communication interfaces are integrated into the R5F101MJAFA#X0, and which support LIN bus physical layer compliance?

The R5F101MJAFA#X0 integrates up to 4 UART channels (with LIN support), up to 10 I²C/Simplified I²C channels, and up to 8 CSI (SPI-compatible) channels. UART0 and UART1 include automatic sync-break detection and LIN-specific timing control - meeting ISO 17987-4 physical layer requirements for node implementation in the R5F101MJAFA#X0.

Is the R5F101MJAFA#X0 pin-compatible with other RL78/G13 variants, and what package type does it use?

The R5F101MJAFA#X0 uses an 80-pin LQFP package (14 × 14 mm, 0.65 mm pitch, PLQP0080JB-E) and is not pin-compatible with 64-pin or LFQFP variants. While sharing the RL78/G13 architecture and register map, pin mapping differs across pin-count families - requiring unique PCB layout for the R5F101MJAFA#X0. Footprint compatibility is limited to other 80-pin LQFP-0.65 mm RL78/G13 parts like R5F100MJAFA#X0.