Renesas R5F101LKAFB#V0

Overview

R5F101LKAFB#V0 from Renesas is a 64-pin LFQFP-0.5 mm pitch, 384 KB flash, no data flash, industrial-grade (−40°C to +85°C) RL78/G13 16-bit MCU with 20 KB RAM, 32 MHz max CPU speed, 66 μA/MHz active current, and integrated RTC, 10-bit ADC (26 channels), UART, I²C, SPI, and 16-bit timers. It targets low-power embedded control in HVAC, smart meters, and industrial sensors.

For engineers reviewing the R5F101LKAFB#V0 datasheet, R5F101LKAFB#V0 pinout, R5F101LKAFB#V0 application, or R5F101LKAFB#V0 equivalent, key selection criteria include its 384 KB code flash without data flash, LFQFP-64 package with 0.5-mm pitch, −40°C to +85°C industrial temperature rating, and support for SNOOZE mode, BGO data flash emulation, and LIN-capable UART.

Technical Context

The R5F101LKAFB#V0 implements the RL78 CPU core with 3-stage pipeline CISC architecture, supporting instruction execution times from 0.03125 μs (32 MHz high-speed mode) to 30.5 μs (32.768 kHz subsystem clock). It integrates a 12-bit interval timer, calendar-mode real-time clock with alarm and correction, and watchdog timer with dedicated low-speed oscillator.

Its peripheral set includes up to 16 channels of 16-bit timer, 3–10 channels of I²C/Simplified I²C, 2–4 UART/LIN interfaces, 2–8 CSI (SPI-compatible) channels, and an 8/10-bit A/D converter with internal 1.45 V reference and temperature sensor-enabled only in HS mode per datasheet note.

Key Specifications

Pinout & Package

Package: 64-pin LFQFP (10 × 10 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 R5F101LKAFB#V0, the #X0 variant offers identical electrical and functional behavior with tape-and-reel logistics benefits, while the R5F101LLAFB#V0 provides headroom in memory for complex connectivity stacks-neither is pin-compatible with data-flash-equipped variants like R5F100 series.

Availability

R5F101LKAFB#V0 is available at Aetrix Electronics and suitable for smart metering, industrial motor drives, and building HVAC systems requiring stable component supply, long-term industrial qualification, and RoHS-compliant manufacturing.

Supply support for R5F101LKAFB#V0 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 product line delivers true low-power 16-bit MCUs optimized for cost-sensitive, battery-operated, and industrial control applications-balancing performance, peripheral richness, and energy efficiency without external crystals or regulators.

FAQ

What is the maximum operating frequency and corresponding DMIPS performance of the R5F101LKAFB#V0?

The R5F101LKAFB#V0 operates at up to 32 MHz with a measured performance of 41 DMIPS. This is achieved using the RL78 CPU core's 3-stage pipeline and high-speed on-chip oscillator. The R5F101LKAFB#V0 maintains this performance across its full 1.6 V to 5.5 V supply range and −40°C to +85°C industrial temperature grade, making it suitable for deterministic real-time control loops in motor drives and sensor fusion applications.

Does the R5F101LKAFB#V0 include data flash memory, and how does that affect firmware design?

No, the R5F101LKAFB#V0 does not include data flash memory-this is indicated by the "101" prefix in the part number per Renesas' naming convention. Firmware must implement nonvolatile parameter storage using external EEPROM, FRAM, or emulate data flash in code flash with wear-leveling. The R5F101LKAFB#V0 retains full self-programming capability for code flash, including boot swap and flash shield window functions, but lacks dedicated data flash erase/write hardware acceleration.

Which communication interfaces are supported by the R5F101LKAFB#V0, and are they hardware-accelerated?

The R5F101LKAFB#V0 supports hardware-accelerated UART (with LIN 2.2 support), I²C/Simplified I²C (up to 10 channels), and CSI (SPI-compatible serial interface, up to 8 channels). All three are implemented in dedicated peripheral blocks with independent baud rate generators, FIFOs, and interrupt capabilities-enabling concurrent multi-protocol operation without CPU overhead. No external transceivers are needed for LIN or standard I²C, though level-shifting may be required for mixed-voltage systems.

What are the low-power modes available on the R5F101LKAFB#V0, and what peripherals remain active in each?

The R5F101LKAFB#V0 supports HALT, STOP, and SNOOZE modes. In STOP mode, only RTC, LVD, and reset circuitry remain active at 0.57 μA. In SNOOZE mode, selected peripherals (e.g., UART, ADC, DMA) operate under CPU supervision while core clocks are gated-enabling low-latency wake-up. HALT mode stops the main clock but retains RAM and register contents at ~1.2 μA. All modes are entered via software instruction and support wake-up via external interrupt, RTC alarm, or LVD event.

Is the R5F101LKAFB#V0 pin-compatible with other RL78/G13 devices in the same package, such as R5F100LKAFB#V0?

No, the R5F101LKAFB#V0 is not pin-compatible with R5F100LKAFB#V0 despite sharing the same 64-pin LFQFP package. The R5F100 series includes data flash and different peripheral configurations (e.g., additional DMA channels, enhanced ADC features), resulting in distinct pin mappings for certain shared functions. Pinouts must be verified against the specific device's datasheet-R5F101LKAFB#V0 uses the "no data flash" variant pin assignment defined in Section 1.3.10 of R01DS0131EJ0380.