Renesas R5F101BFANA#20

Overview

R5F101BFANA#20 from Renesas is a 32-bit RL78/G13 microcontroller with 64 KB flash memory, 4 KB data flash, and 4 KB RAM, operating at up to 32 MHz with 41 DMIPS performance. It features ultra-low power consumption (66 μA/MHz active, 0.57 μA RTC+LVD mode), 10-bit ADC (26 channels), multiple serial interfaces (UART, CSI, I²C), and real-time clock - deployed in battery-powered industrial sensors and smart metering endpoints.

For engineers reviewing the R5F101BFANA#20 datasheet, R5F101BFANA#20 pinout, R5F101BFANA#20 application, or R5F101BFANA#20 equivalent, key selection criteria include its 32-pin HWQFN package, absence of on-chip data flash (R5F101x series), -40°C to +85°C industrial temperature grade, and support for SNOOZE/STOP/HALT low-power modes in resource-constrained embedded control designs.

Technical Context

The R5F101BFANA#20 implements the RL78 CPU core with CISC architecture and 3-stage pipeline, enabling instruction execution times from 0.03125 μs (32 MHz high-speed mode) to 30.5 μs (32.768 kHz ultra-low-speed mode). Its memory subsystem includes 64 KB code flash (1 KB block size), 4 KB RAM, and no on-chip data flash - distinguishing it from R5F100x variants.

Peripheral integration includes eight 16-bit timers, one 12-bit interval timer, one real-time clock with calendar/alarm functions, one watchdog timer, and a 10-bit A/D converter with internal reference voltage (1.45 V) and temperature sensor. Serial connectivity supports up to four UART/LIN channels, eight CSI channels, and ten I²C/Simplified I²C channels - configurable per pin mapping.

Key Specifications

Pinout & Package

Package: 32-pin HWQFN (5 × 5 mm, 0.5-mm pitch), RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F100BFANA#20 and RL78/G14 R5F104BAANA#20, the R5F101BFANA#20 provides optimal cost/performance balance for fixed-function embedded controllers where data flash is unnecessary and memory headroom is constrained - avoiding over-provisioned resources while maintaining full peripheral compatibility within the RL78/G13 family.

Availability

R5F101BFANA#20 is available at Aetrix Electronics and suitable for smart energy meters, industrial sensor nodes, home appliance control units, and medical wearables requiring stable component supply across long production lifecycles.

Supply support for R5F101BFANA#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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power management ICs for industrial, automotive, and IoT markets.

The RL78/G13 product line delivers ultra-low-power 32-bit MCUs optimized for cost-sensitive, battery-operated, and general-purpose embedded control applications - emphasizing energy efficiency, integrated analog peripherals, and toolchain maturity.

FAQ

What is the maximum operating frequency and corresponding performance of the R5F101BFANA#20?

The R5F101BFANA#20 operates at up to 32 MHz using its high-speed on-chip oscillator, achieving 41 DMIPS performance. This execution speed supports deterministic real-time tasks such as motor commutation, sensor fusion, and protocol stack processing. The minimum instruction time is 0.03125 μs under these conditions, and the device also supports ultra-low-speed operation down to 32.768 kHz for RTC and LVD-only functions.

Does the R5F101BFANA#20 include on-chip data flash memory?

No, the R5F101BFANA#20 does not include on-chip data flash memory. As indicated by the "101" prefix in its part number (per Renesas RL78/G13 documentation), this variant provides only 64 KB of code flash and 4 KB of RAM. Data retention requirements must be met using external EEPROM, FRAM, or by allocating code flash sectors for emulation - unlike the R5F100x series which integrates 4–8 KB of dedicated data flash.

What package type and pin count does the R5F101BFANA#20 use?

The R5F101BFANA#20 uses a 32-pin HWQFN package measuring 5 × 5 mm with 0.5-mm pitch. This surface-mount package is RoHS-compliant and rated for moisture sensitivity level 3. Pin configuration matches other RL78/G13 32-pin variants, enabling layout reuse across family members including R5F100BFANA#20 and R5F101BGANA#20.

What low-power modes are supported by the R5F101BFANA#20, and what are their typical current draws?

The R5F101BFANA#20 supports HALT, STOP, and SNOOZE modes. HALT mode draws 0.57 μA with RTC and LVD active; STOP mode consumes 0.94 μA with main oscillator stopped; SNOOZE enables background ADC operation while CPU remains asleep. These modes are controlled via software registers and support fast wake-up (< 4 μs from HALT), making the R5F101BFANA#20 suitable for intermittent-sensing applications.

How many analog input channels and what ADC resolution does the R5F101BFANA#20 provide?

The R5F101BFANA#20 integrates a 10-bit successive-approximation ADC with up to 26 analog input channels (ANI0–ANI25), selectable via software-controlled multiplexer. It includes an internal 1.45 V reference voltage and supports temperature sensor readout. Input voltage range is tied to VDD (1.6–5.5 V), allowing direct interfacing with resistive sensors, thermistors, and bridge amplifiers without external reference components.