Renesas R5F101LFABG#U0

Overview

R5F101LFABG#U0 from Renesas is a 64-pin VFBGA-packaged RL78/G13 16-bit microcontroller with 128 KB flash, 8 KB RAM, and no data flash memory, operating from 1.6 V to 5.5 V across -40°C to +105°C industrial temperature range. It delivers 41 DMIPS at 32 MHz, integrates 16-bit timers (12 channels), 10-bit ADC (26 channels), RTC, UART/I²C/CSI interfaces, and ultra-low-power HALT/STOP/SNOOZE modes - deployed in smart metering and industrial sensor nodes.

For engineers reviewing the R5F101LFABG#U0 datasheet, R5F101LFABG#U0 pinout, R5F101LFABG#U0 application, or R5F101LFABG#U0 equivalent, key selection criteria include its VFBGA-64 (4 × 4 mm, 0.4 mm pitch) package, absence of on-chip data flash, industrial-grade temperature support, and compatibility with Renesas' RL78 toolchain and E2 studio IDE for low-power embedded firmware development.

Technical Context

The R5F101LFABG#U0 implements the RL78 CPU core with CISC architecture and 3-stage pipeline, supporting 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 map spans 1 MB address space with 128 KB code flash, 8 KB RAM, and no data flash - distinguishing it from R5F100x variants that include 4–8 KB data flash.

Power management includes on-chip POR, LVD with 14 selectable levels, and three low-power modes (HALT, STOP, SNOOZE); real-time operation is sustained via dedicated RTC channel with calendar, alarm, and clock correction functions. Peripheral integration covers 12× 16-bit timers, 26-channel 10-bit ADC with internal 1.45 V reference and temperature sensor, and up to 10 serial interface channels (CSI, UART/LIN, I²C).

Key Specifications

Pinout & Package

VFBGA-64 package (4 mm × 4 mm, 0.4 mm pitch, 0.65 mm height), ball layout optimized for compact PCB routing and thermal dissipation in sealed industrial modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with R5F100LFABG#U0, the R5F101LFABG#U0 saves board space by eliminating data flash circuitry and reduces firmware complexity, while the RL78/G14 alternative adds memory headroom and peripheral bandwidth at the cost of higher active current and toolchain migration effort.

Availability

R5F101LFABG#U0 is available at Aetrix Electronics and suitable for smart metering, industrial sensor nodes, PLC I/O modules, and gas detector control units requiring stable component supply across extended product lifecycles.

Supply support for R5F101LFABG#U0 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 applications - balancing performance, integration, and energy efficiency for industrial controls and metering systems.

FAQ

What is the maximum operating frequency and corresponding performance of the R5F101LFABG#U0?

The R5F101LFABG#U0 operates at up to 32 MHz with a high-speed on-chip oscillator, delivering 41 DMIPS. Its minimum instruction execution time is 0.03125 μs in this mode, and it supports dynamic clock scaling down to 32.768 kHz for ultra-low-power RTC operation. This dual-speed capability allows the R5F101LFABG#U0 to balance computational throughput and energy efficiency across diverse operational phases.

Does the R5F101LFABG#U0 include on-chip data flash memory?

No, the R5F101LFABG#U0 does not include on-chip data flash memory. Unlike R5F100x variants in the same RL78/G13 family, the R5F101LFABG#U0 is configured with 128 KB code flash and 8 KB RAM only. Applications requiring non-volatile parameter storage must use external serial EEPROM or FRAM, or implement wear-leveling on a portion of the main flash using Renesas' Flash Self-Programming Library.

What package type and pin count does the R5F101LFABG#U0 use?

The R5F101LFABG#U0 uses a 64-ball VFBGA package (4 mm × 4 mm, 0.4 mm pitch), designated by the "BG" suffix in the part number. It provides 64 I/O balls including power, ground, analog, and multifunction digital pins - optimized for high-density industrial PCB layouts where footprint and thermal performance are critical.

What industrial temperature grade does the R5F101LFABG#U0 support?

The R5F101LFABG#U0 is rated for industrial operation from -40°C to +105°C, indicated by the "G" suffix in the part number. This grade qualifies the device for deployment in harsh environments such as enclosed utility meters, factory-floor controllers, and outdoor environmental monitors without derating or external thermal management.

Which serial communication protocols are supported by the R5F101LFABG#U0?

The R5F101LFABG#U0 supports CSI (Renesas' SPI-compatible interface), UART/LIN (with LIN bus physical layer compliance), and I²C/Simplified I²C across up to 10 configurable channels. These interfaces can be assigned to shared pins like P10/P11, enabling flexible peripheral connectivity - for example, using CSI for sensor reads, UART for host communication, and I²C for display control on the same device.

How does the R5F101LFABG#U0 manage power in battery-operated applications?

The R5F101LFABG#U0 achieves ultra-low-power operation via HALT (66 μA/MHz), STOP (0.57 μA), and SNOOZE modes. In STOP mode, only the RTC and LVD remain active - allowing wake-up on external interrupt, RTC alarm, or voltage threshold breach. This enables multi-year battery life in applications like wireless sensor nodes, where the R5F101LFABG#U0 spends >99.9% of time in STOP mode between measurement cycles.