Renesas R5F104BFANA#20

Overview

R5F104BFANA#20 from Renesas is a 32-pin HWQFN-packaged 16-bit RL78/G14 microcontroller with 64 KB flash, 5.5 KB RAM, and 4 KB data flash, operating from 1.6–5.5 V at up to 32 MHz (44 DMIPS), targeting ultra-low-power industrial sensor nodes and battery-powered control systems.

For engineers reviewing the R5F104BFANA#20 datasheet, R5F104BFANA#20 pinout, R5F104BFANA#20 application, or R5F104BFANA#20 equivalent, key selection criteria include its 66 μA/MHz active current, RTC+LVD standby mode (0.60 μA), integrated 10-bit ADC (20-channel), dual UART/LIN support, and hardware DTC/ELC for deterministic peripheral coordination.

Technical Context

The R5F104BFANA#20 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 within a 1 MB address space. It integrates a high-accuracy ±1.0% on-chip oscillator (selectable 1–64 MHz) and supports HALT/STOP/SNOOZE low-power modes.

Peripheral subsystems include an Event Link Controller (ELC) enabling direct hardware-triggered peripheral activation (19–26 event types), a Data Transfer Controller (DTC) with chain transfer capability, and dual independent serial interfaces: CSI (SPI-compatible) and UART/LIN with automatic LIN header detection and checksum generation.

Key Specifications

Pinout & Package

Package: 32-pin HWQFN (5 × 5 mm, 0.5 mm pitch), exposed die pad recommended to be connected to VSS. Pin count and package type are confirmed per Renesas ordering code "NA" and datasheet Table 1-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F104BEANA#20 and R5F104BGANA#20, the R5F104BFANA#20 delivers optimal balance of memory headroom (64 KB flash), deterministic real-time performance (44 DMIPS), and ultra-low-power operation-making it ideal for cost-sensitive industrial controls requiring field-upgradable firmware but not full RTOS overhead.

Availability

R5F104BFANA#20 is available at Aetrix Electronics and suitable for industrial motor control panels, smart home sensor hubs, medical wearables, and automotive body control modules requiring stable component supply and long-term lifecycle assurance.

Supply support for R5F104BFANA#20 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/G14 product line delivers true low-power 16-bit MCUs optimized for cost-sensitive, battery-operated, and industrial control applications requiring robust peripheral integration and long-term reliability.

FAQ

What is the maximum operating frequency and corresponding DMIPS rating for the R5F104BFANA#20?

The R5F104BFANA#20 operates at up to 32 MHz with a measured performance of 44 DMIPS. This rating is achieved using the RL78 CPU core's 3-stage pipeline and verified under standard test conditions (VDD = 3.3 V, TA = 25°C). The R5F104BFANA#20 maintains full peripheral functionality-including ADC, UART, and timers-at this speed, making it suitable for real-time control tasks in industrial and consumer applications.

Does the R5F104BFANA#20 support LIN bus communication, and if so, which UART channels implement it?

Yes, the R5F104BFANA#20 supports LIN bus communication on UART channels 0, 1, and 2. Each channel includes dedicated LIN header detection, automatic checksum generation (classic and enhanced), and wake-up-on-break functionality. The R5F104BFANA#20 implements LIN 2.2A compliance in hardware, eliminating software overhead and ensuring deterministic frame timing critical for automotive body electronics.

What are the memory resources allocated to the R5F104BFANA#20, and how is data flash endurance specified?

The R5F104BFANA#20 integrates 64 KB of code flash memory, 4 KB of data flash memory, and 5.5 KB of on-chip RAM. Data flash endurance is rated at 1,000,000 write/erase cycles (typical) across the full VDD range (1.8–5.5 V), with background operation (BGO) enabling concurrent program execution during rewrites. This allows the R5F104BFANA#20 to store calibration data, device configuration, or usage logs without halting application code.

How does the R5F104BFANA#20 achieve ultra-low power consumption, and what is its lowest valid standby current?

The R5F104BFANA#20 achieves ultra-low power via multiple hardware-controlled modes: HALT (CPU stopped, peripherals active), STOP (all clocks halted except subclock), and SNOOZE (selected peripherals active while CPU sleeps). Its lowest valid standby current is 0.60 μA in STOP mode with only RTC and LVD operational at VDD = 3.0 V and TA = 25°C. This value is guaranteed across the full industrial temperature range (-40 to +85°C), enabling decade-long operation in energy-harvesting or coin-cell applications.

Is the R5F104BFANA#20 pin-compatible with other RL78/G14 variants in the same 32-pin HWQFN package?

Yes, the R5F104BFANA#20 is pin-compatible with all RL78/G14 family members sharing the 32-pin HWQFN (NA) package, including R5F104BEANA#20, R5F104BGANA#20, and R5F104BDANA#20. Pin functions, electrical characteristics, and thermal behavior are identical across these variants; only flash/RAM capacities and factory-programmed options differ. This allows seamless migration between memory configurations without PCB redesign when scaling firmware complexity.