Renesas R5F104JJAFA#X0

Overview

R5F104JJAFA#X0 from Renesas is a 52-pin LQFP-0.65mm 8-bit RL78/G14 microcontroller with 256 KB flash, 20 KB RAM, and 12-bit ADC (20-channel), operating from 1.6–5.5 V at -40°C to +85°C for industrial control, sensor nodes, and appliance HMI applications.

For engineers reviewing the R5F104JJAFA#X0 datasheet, R5F104JJAFA#X0 pinout, R5F104JJAFA#X0 application, or R5F104JJAFA#X0 equivalent, key selection criteria include its 256 KB code flash with data flash shield, ultra-low-power STOP mode (0.60 μA), integrated RTC with calendar, and dual UART/LIN support for robust serial communication in resource-constrained embedded systems.

Technical Context

The R5F104JJAFA#X0 implements the RL78 CPU core with 3-stage pipeline, supporting instruction execution times from 0.03125 μs (32 MHz) to 30.5 μs (32.768 kHz), and includes multiply/divide/accumulate instructions. Its memory subsystem integrates 256 KB on-chip flash with 1 KB block erase and security lock, plus 4 KB data flash with background operation (BGO) and 1M rewrite endurance.

Peripheral integration includes 20-channel 8/10-bit ADC with internal 1.45 V reference and temperature sensor, dual UART/LIN channels, up to 10 I²C interfaces, 12-channel 16-bit TAU timer, real-time clock with alarm/calendar, and event-link controller (ELC) enabling hardware-triggered peripheral chaining without CPU intervention.

Key Specifications

Pinout & Package

52-pin LQFP package (10 × 10 mm, 0.65 mm pitch), RoHS-compliant, with exposed thermal pad not present (LQFP variant). Pin functions include dual UART/LIN, 20-channel ADC inputs, crystal oscillator (X1/X2), RESET, REGC decoupling, and flexible I/O with N-ch open-drain, pull-up, and TTL buffer options.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F104JGAFA#X0 and R5F104JHAFA#X0, the R5F104JJAFA#X0 provides 64 KB and 128 KB more flash respectively-critical for OTA-capable firmware, cryptographic libraries, or multi-protocol stacks-without increasing pin count, PCB area, or power consumption.

Availability

R5F104JJAFA#X0 is available at Aetrix Electronics and suitable for industrial motor control, smart appliance HMI, energy metering, and building automation sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for R5F104JJAFA#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 specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and IoT markets.

The RL78/G14 product line delivers true low-power performance (66 μA/MHz, 0.60 μA STOP) with rich analog and communication peripherals, targeting cost-sensitive, battery-operated, and industrial-grade embedded applications.

FAQ

What is the maximum operating frequency of the R5F104JJAFA#X0?

The R5F104JJAFA#X0 supports a maximum system clock frequency of 32 MHz using the high-speed on-chip oscillator, delivering 44 DMIPS performance. It also supports sub-kHz operation down to 32.768 kHz for ultra-low-power RTC and sleep modes, with instruction execution time scaling accordingly (0.03125 μs at 32 MHz, 30.5 μs at 32.768 kHz). The R5F104JJAFA#X0 does not require external crystals for full functionality.

Does the R5F104JJAFA#X0 support LIN bus communication?

Yes, the R5F104JJAFA#X0 supports LIN bus communication through its two UART modules, each configurable for LIN 2.2 physical layer compliance including break detection, sync field handling, and checksum calculation. This enables direct integration into automotive body electronics and industrial distributed control networks without external transceivers. The R5F104JJAFA#X0 implements LIN protocol timing in hardware via the UART baud rate generator and ELC-triggered response windows.

How much data flash memory does the R5F104JJAFA#X0 include, and what is its endurance?

The R5F104JJAFA#X0 includes 4 KB of on-chip data flash memory rated for 1,000,000 write/erase cycles (typical) across the full operating voltage range of 1.8–5.5 V. It supports background operation (BGO), allowing program execution from code flash while data flash is being rewritten-essential for reliable firmware updates and nonvolatile data logging. The R5F104JJAFA#X0 uses the same flash technology and endurance spec as all RL78/G14 variants with 4 KB data flash.

What are the low-power modes supported by the R5F104JJAFA#X0, and their typical current consumption?

The R5F104JJAFA#X0 supports HALT (66 μA/MHz), STOP (0.60 μA with RTC + LVD active), and SNOOZE modes. In STOP mode, only the 32.768 kHz subsystem clock runs, maintaining RTC calendar, LVD monitoring, and wake-up capability via interrupts-all while drawing just 0.60 μA. This makes the R5F104JJAFA#X0 ideal for battery-powered endpoints requiring multi-year operation. No external components are needed to achieve this specification.

Can the R5F104JJAFA#X0 operate from a 1.6 V supply, and what features remain functional?

Yes, the R5F104JJAFA#X0 operates across 1.6–5.5 V, and all core peripherals-including 256 KB flash, 20 KB RAM, 20-channel ADC, dual UART/LIN, and RTC-remain fully functional at 1.6 V. The high-speed on-chip oscillator is guaranteed to run at 32 MHz down to 1.8 V; below that, lower frequencies (e.g., 16 MHz at 1.6 V) are supported per datasheet AC characteristics. The R5F104JJAFA#X0 maintains full pin functionality and I/O drive strength across the entire voltage range.