Renesas R5F101JCAFA#X0

Overview

R5F101JCAFA#X0 from Renesas is a 52-pin LQFP-0.65mm ultra-low-power 16-bit RL78/G13 microcontroller with 64 KB flash memory, 4 KB data flash, 4 KB RAM, and integrated real-time clock (RTC), 10-bit ADC (26 channels), UART/LIN, I²C, and SPI interfaces - deployed in battery-powered industrial sensors and smart metering endpoints.

For engineers reviewing the R5F101JCAFA#X0 datasheet, R5F101JCAFA#X0 pinout, R5F101JCAFA#X0 application, or R5F101JCAFA#X0 equivalent, key selection criteria include its 1.6–5.5 V operation range, 66 μA/MHz active current, STOP mode at 0.57 μA, 32 MHz max CPU speed, and support for background data flash rewriting - critical for firmware-over-the-air updates in field-deployed devices.

Technical Context

The R5F101JCAFA#X0 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 RTC mode). It integrates a 12-bit interval timer, watchdog timer, and DMA controller with 2/4 channels supporting 2-clock transfers between SFR and RAM.

Its analog subsystem includes a 10-bit A/D converter with up to 26 input channels, internal 1.45 V reference voltage, and temperature sensor (enabled only in HS mode); digital peripherals include up to 16 × 16-bit timers, 3–10 I²C channels, 2–4 UART/LIN ports, and 2–8 CSI (SPI-compatible) interfaces - all operating across -40°C to +85°C ambient range.

Key Specifications

Pinout & Package

Package: 52-pin LQFP (10 × 10 mm, 0.65-mm pitch), RoHS-compliant, moisture sensitivity level (MSL) 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F101JCAFA#X0, R5F101JDAFA#X0 offers scalable memory for feature-rich firmware, while R5F100JCAFA#X0 restores data flash capability at the cost of higher unit price and identical power profile - enabling trade-offs between code growth headroom and persistent data logging depth.

Availability

R5F101JCAFA#X0 is available at Aetrix Electronics and suitable for smart metering, industrial sensor nodes, and home appliance control requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for R5F101JCAFA#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 automotive, industrial, and IoT markets.

The RL78/G13 family targets cost-sensitive, ultra-low-power general-purpose applications - balancing performance, integration, and energy efficiency for battery-operated and energy-harvesting systems.

FAQ

What is the maximum operating frequency and corresponding performance of the R5F101JCAFA#X0?

The R5F101JCAFA#X0 operates at up to 32 MHz, delivering 41 DMIPS of processing performance. This speed is achieved using the high-speed on-chip oscillator with ±1.0% accuracy across 1.8–5.5 V and -20°C to +85°C. The RL78 core's 3-stage pipeline enables deterministic timing for real-time control tasks, and instruction execution time scales dynamically from 0.03125 μs (32 MHz) to 30.5 μs (32.768 kHz), making the R5F101JCAFA#X0 suitable for both high-speed computation and ultra-low-power RTC operation.

Does the R5F101JCAFA#X0 include data flash memory, and what are its key characteristics?

No, the R5F101JCAFA#X0 does not include data flash memory - this is indicated by the "101" prefix in the part number (per Renesas documentation, "101" denotes no data flash, while "100" denotes inclusion). Therefore, R5F101JCAFA#X0 relies solely on its 64 KB code flash for program storage and nonvolatile configuration. For applications requiring dedicated, wear-leveled data storage, alternatives like R5F100JCAFA#X0 (with 8 KB data flash) must be selected. The R5F101JCAFA#X0 retains full self-programming capability for code flash updates.

What power modes does the R5F101JCAFA#X0 support, and what are their typical current draws?

The R5F101JCAFA#X0 supports HALT, STOP, and SNOOZE modes. In STOP mode with only RTC and LVD active, it consumes 0.57 μA - ideal for long-duration sleep in battery-powered devices. Active-mode current is 66 μA/MHz at 32 MHz (≈2.1 mA total), and HALT mode draws approximately 1.2 μA. These values are measured at VDD = 3.0 V and TA = 25°C per R01DS0131EJ0380 Rev.3.80. All modes retain RAM content and allow wake-up via external interrupt, RTC alarm, or LVD event - ensuring responsive recovery without full reinitialization.

How many analog input channels and what ADC resolution does the R5F101JCAFA#X0 provide?

The R5F101JCAFA#X0 features a 10-bit successive-approximation ADC with up to 26 analog input channels (ANI0–ANI25), configurable via Pn and ANIm pin mappings. It includes an internal 1.45 V reference voltage and supports temperature sensor readout (in HS mode only). The ADC operates across the full 1.6–5.5 V VDD range, enabling direct measurement of sensors powered from the same rail. Conversion time is programmable down to 1.5 μs per sample, and results are accessible via 16-bit data registers with left/right justification options - facilitating efficient signal processing in sensor fusion algorithms.

Is the R5F101JCAFA#X0 pin-compatible with other RL78/G13 variants in the same package?

Yes, the R5F101JCAFA#X0 is pin-compatible with all other RL78/G13 52-pin LQFP-0.65mm variants (e.g., R5F100JCAFA#X0, R5F101JDAFA#X0), sharing identical pin count, pitch, footprint, and basic I/O assignment. However, peripheral availability (e.g., number of UART channels, I²C instances, or timer outputs) varies by memory configuration and data flash presence. Pin compatibility enables hardware reuse across firmware variants, but register-level initialization and peripheral enablement must be verified against each specific device's datasheet section "Outline of Functions" (R01DS0131EJ0380 §1.6).