Renesas R5F100CFALA#U0

Overview

R5F100CFALA#U0 from Renesas is a 36-pin WFLGA-packaged RL78/G13 16-bit microcontroller with 32 KB flash memory, 2 KB RAM, and 4 KB data flash, operating from 1.6 V to 5.5 V. It delivers 41 DMIPS at 32 MHz, features ultra-low-power modes (66 μA/MHz active, 0.57 μA RTC+LVD), and integrates 10-bit ADC (26 channels), RTC, UART, I²C, and SPI for embedded control in battery-powered industrial sensors and home appliances.

For engineers reviewing the R5F100CFALA#U0 datasheet, R5F100CFALA#U0 pinout, R5F100CFALA#U0 application, or R5F100CFALA#U0 equivalent, key selection criteria include its 36-pin WFLGA-0.5 mm pitch package, 32 KB code flash with self-programming, 4 KB background-operable data flash, 10-bit ADC with internal temperature sensor, and support for STOP/HALT/SNOOZE low-power states in -40°C to +85°C ambient.

Technical Context

The R5F100CFALA#U0 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 subsystem clock). It supports on-chip debug, flash shield window, boot swap, and BGO for concurrent program execution during data flash rewrite.

Its peripheral set includes up to 16× 16-bit timers, 1× real-time clock with calendar/alarm/correction, 1× watchdog timer, 2–4 channel DMA, 16×16-bit multiplier/32-bit divider, and serial interfaces: CSI (SPI-like), UART/LIN, and I²C - all configurable across 36 I/O pins with N-ch open-drain, TTL input, and pull-up options.

Key Specifications

Pinout & Package

Package: 36-pin WFLGA (4 × 4 mm, 0.5 mm pitch), lead-free, moisture sensitivity level 3 (MSL3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F100BFALA#U0 and R5F101CFALA#U0, the R5F100CFALA#U0 uniquely combines 32 KB flash, 4 KB data flash with BGO, and full RTC functionality in a 36-pin WFLGA package - making it optimal for time-aware, field-upgradable, and battery-constrained embedded systems where code size, nonvolatile parameter storage, and accurate timekeeping are jointly required.

Availability

R5F100CFALA#U0 is available at Aetrix Electronics and suitable for smart thermostats, industrial flow sensors, and energy metering modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for R5F100CFALA#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 delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The RL78/G13 product line targets cost-sensitive, ultra-low-power general-purpose embedded applications - emphasizing energy efficiency, integration density, and ease of migration from legacy 8-bit platforms.

FAQ

What is the maximum operating frequency and corresponding performance of the R5F100CFALA#U0?

The R5F100CFALA#U0 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. The core also supports ultra-low-speed operation at 32.768 kHz (30.5 μs per instruction) for RTC and low-power monitoring tasks - all within the same device without external clock components.

Does the R5F100CFALA#U0 support in-system programming and secure firmware updates?

Yes, the R5F100CFALA#U0 supports full in-system programming via on-chip debug interface and includes flash shield window and block erase/write prohibition features for firmware security. It enables self-programming with boot swap capability, allowing safe dual-bank firmware updates. The 4 KB data flash supports background operation (BGO), so application code continues running during parameter or calibration data writes.

What are the low-power modes supported by the R5F100CFALA#U0, and what is the typical current draw in each?

The R5F100CFALA#U0 supports HALT, STOP, and SNOOZE modes. In STOP mode with only RTC and LVD active, it draws 0.57 μA (typical). Active-mode consumption is 66 μA/MHz. HALT mode reduces current further by stopping the CPU clock while preserving RAM and register contents. SNOOZE mode allows selected peripherals (e.g., ADC, UART) to operate autonomously while the CPU remains halted - ideal for periodic sensor polling.

Can the R5F100CFALA#U0 interface directly with 1.8 V or 2.5 V logic devices?

Yes, the R5F100CFALA#U0 supports different-potential interface: its I/O ports can be configured to operate with 1.8 V, 2.5 V, or 3 V external logic levels while powered from 1.6–5.5 V. This eliminates level-shifter components in mixed-voltage systems. N-ch open-drain outputs with 6 V tolerance also allow safe interfacing with higher-voltage peripherals in industrial environments.

Is an external crystal required for real-time clock operation in the R5F100CFALA#U0?

No - the R5F100CFALA#U0 integrates a dedicated low-speed on-chip oscillator for RTC operation, but it also supports connection of a 32.768 kHz crystal to CLKP/CLKM pins for higher accuracy (±20 ppm typical). The internal oscillator provides sufficient accuracy for non-critical timing; the external crystal is optional and used only when calendar-grade precision is required per IEC/EN standards.