Renesas R5F100CFALA#W0

Overview

R5F100CFALA#W0 from Renesas is a 36-pin, 32-bit RL78/G13 microcontroller with 32 KB flash memory, 2 KB RAM, and 4 KB data flash, operating from 1.6 V to 5.5 V across -40°C to +85°C. It delivers 41 DMIPS at 32 MHz, integrates an RTC, 10-bit ADC (26 channels), UART/SPI/I²C interfaces, and ultra-low-power modes (0.57 μA in STOP with RTC+LVD), targeting battery-powered industrial sensors and smart meters.

For engineers reviewing the R5F100CFALA#W0 datasheet, R5F100CFALA#W0 pinout, R5F100CFALA#W0 application, or R5F100CFALA#W0 equivalent, key selection criteria include its WFLGA-36 package, integrated data flash with 1M rewrite cycles, real-time clock with calendar/alarm, low-voltage detection across 14 levels, and support for background data flash programming during code execution.

Technical Context

The R5F100CFALA#W0 implements the RL78 CPU core with a 3-stage CISC pipeline, supporting instruction execution times from 0.03125 μs (32 MHz high-speed mode) to 30.5 μs (32.768 kHz subsystem clock). It features dual-clock domains: a high-speed on-chip oscillator (±1.0% accuracy, selectable from 1–32 MHz) and a dedicated low-speed oscillator for watchdog and RTC operation.

Its peripheral set includes up to 16× 16-bit timers, a 12-bit interval timer, hardware DMA (4 channels), multiplier/divider/MAC units, and simplified SPI/UART/I²C interfaces - all optimized for deterministic real-time control in resource-constrained embedded systems without external timing components.

Key Specifications

Pinout & Package

Package: 36-pin WFLGA (4 × 4 mm, 0.5-mm pitch), lead-free, moisture-sensitive level 3 - suitable for compact PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F100BFALA#W0 and R5F101CFALA#W0, the R5F100CFALA#W0 uniquely balances 32 KB code capacity, 4 KB field-upgradable data flash, and ultra-low-power operation - making it optimal for next-generation IoT endpoints requiring local data persistence and long service life without external memory.

Availability

R5F100CFALA#W0 is available at Aetrix Electronics and suitable for smart metering, industrial sensing, home appliance control, and medical wearable designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for R5F100CFALA#W0 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 embedded control with integrated peripherals and robust flash technology - designed specifically for cost-sensitive, battery-operated, and safety-aware general-purpose applications.

FAQ

What is the maximum operating frequency and corresponding performance of the R5F100CFALA#W0?

The R5F100CFALA#W0 operates at up to 32 MHz using its high-speed on-chip oscillator, delivering 41 DMIPS of processing performance. Its minimum instruction execution time is 0.03125 μs under this condition, enabling fast response in real-time control tasks such as motor commutation or sensor fusion. The core maintains full functionality across its entire 1.6–5.5 V supply range.

Does the R5F100CFALA#W0 support in-system programming and secure firmware updates?

Yes, the R5F100CFALA#W0 supports full in-system programming via its on-chip debug interface and includes a boot swap function within its self-programming capability. This allows validated firmware images to be written to alternate flash blocks and activated atomically - ensuring fail-safe updates without bricking the device. Flash shield window protection further prevents unauthorized access to critical code sections.

What are the low-power modes available on the R5F100CFALA#W0, and what is the lowest current draw?

The R5F100CFALA#W0 offers HALT, STOP, and SNOOZE modes. In STOP mode with only RTC and LVD active, it draws just 0.57 μA - verified across -40°C to +85°C. HALT mode consumes 66 μA per MHz, and SNOOZE enables selective peripheral wake-up while retaining RAM content. All modes retain register states and support fast wake-up (< 4 μs from HALT).

Can the R5F100CFALA#W0 operate without an external crystal?

Yes, the R5F100CFALA#W0 can operate entirely without external crystals. Its high-speed on-chip oscillator (±1.0% accuracy from 1–32 MHz) and dedicated low-speed oscillator (for RTC/WDT) eliminate the need for external timing components in most applications. An optional 32.768 kHz crystal may be added solely to improve RTC long-term accuracy beyond ±100 ppm.

How many analog input channels does the R5F100CFALA#W0 support, and what ADC resolution is available?

The R5F100CFALA#W0 integrates a 10-bit successive-approximation ADC with up to 26 analog input channels (ANI0–ANI18 plus dedicated pins), configurable with internal 1.45 V reference or external AVREFP/AVREFM. It supports both single-ended and pseudo-differential acquisition, and conversion results are accessible via DMA - enabling high-throughput sensor monitoring without CPU overhead.