Renesas R5F104AAASP#50

Overview

R5F104AAASP#50 from Renesas is a 30-pin LSSOP-packaged RL78/G14 16-bit microcontroller with 16 KB flash, 2.5 KB RAM, and 4 KB data flash, operating from 1.6–5.5 V at -40 to +85°C (A-grade). It delivers 44 DMIPS at 32 MHz, features ultra-low-power HALT/STOP/SNOOZE modes (66 μA/MHz active, 0.60 μA RTC+LVD), and integrates 10-bit ADC (8 channels), UART/SPI/I²C interfaces, RTC, and on-chip debug for cost-sensitive consumer control applications.

For engineers reviewing the R5F104AAASP#50 datasheet, R5F104AAASP#50 pinout, R5F104AAASP#50 application, or R5F104AAASP#50 equivalent, key selection considerations include its 30-pin LSSOP-0.65mm package, 16 KB flash memory size, A-grade temperature rating, integrated voltage detector (LVD) with 14-level selection, and support for background data flash rewriting (BGO) with 1M-cycle endurance.

Technical Context

The R5F104AAASP#50 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). It includes a dedicated low-speed on-chip oscillator for watchdog timer operation and supports multiply/divide/accumulate instructions within its 1 MB address space.

Its peripheral set includes Timer Array Unit (TAU) with up to 8 channels, 12-bit interval timer, real-time clock with calendar/alarm/correction, and Event Link Controller (ELC) enabling direct hardware linking of 19–26 event signals to peripherals-reducing CPU overhead in deterministic timing-critical tasks like motor control or sensor polling.

Key Specifications

Pinout & Package

Package: 30-pin plastic LSSOP (7.62 mm body width, 0.65 mm pitch), JEDEC MS-012AC compliant. Requires REGC-to-VSS decoupling capacitor (0.47–1 µF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F104BAANA#U0, the R5F104AAASP#50 offers lower assembly cost and simpler reflow but less thermal headroom; versus R5F104AEASP#50, it provides identical mechanical compatibility with reduced memory - ideal for fixed-function, cost-optimized deployments where code size is stable.

Availability

R5F104AAASP#50 is available at Aetrix Electronics and suitable for home appliance control, smart meter interface, wireless sensor nodes, and industrial HMI panels requiring stable component supply across production lifecycles.

Supply support for R5F104AAASP#50 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 enterprise markets.

The RL78/G14 product line delivers true low-power 16-bit MCUs optimized for cost-sensitive general-purpose applications including white goods, metering, and sensor hubs - balancing performance, integration, and energy efficiency.

FAQ

What is the maximum operating frequency and corresponding performance of the R5F104AAASP#50?

The R5F104AAASP#50 operates at up to 32 MHz, delivering 44 DMIPS of processing performance. Its high-speed on-chip oscillator achieves ±1.0% accuracy across 1.8–5.5 V and -20 to +85°C, eliminating need for external crystal in many applications. The RL78 core supports variable instruction timing - from 0.03125 µs at 32 MHz down to 30.5 µs at 32.768 kHz - enabling dynamic power/performance scaling in the R5F104AAASP#50.

Does the R5F104AAASP#50 support in-system programming and secure firmware updates?

Yes, the R5F104AAASP#50 supports self-programming of both code and data flash memory with boot swapping and flash shield window protection. It includes a security function that prohibits block erase and rewriting to prevent unauthorized firmware modification. The on-chip debug interface enables programming via single-wire SWD using TOOL0/TOOLRxD/TOOLTxD pins, allowing field firmware updates without removing the R5F104AAASP#50 from the PCB.

What analog peripherals are integrated into the R5F104AAASP#50?

The R5F104AAASP#50 integrates an 8-channel, 10-bit successive-approximation ADC with internal 1.45 V reference voltage and temperature sensor. It does not include a D/A converter or comparator. Analog inputs accept 0–VDD range, and the ADC supports scan mode with automatic channel sequencing. No DAC or analog comparator channels are present - designs requiring those functions must add external components or select a higher-tier RL78/G14 variant.

How does the R5F104AAASP#50 manage power in battery-operated applications?

The R5F104AAASP#50 provides three ultra-low-power modes: HALT (CPU stopped, peripherals active), STOP (all clocks halted except RTC/LVD), and SNOOZE (selected peripherals active while CPU sleeps). In STOP mode with RTC and LVD enabled, it draws just 0.60 μA - enabling multi-year operation on coin-cell batteries. Its 1.6–5.5 V operating range accommodates declining battery voltage without external regulators, and the 14-level LVD ensures reliable brown-out detection across the R5F104AAASP#50's full supply range.

What communication interfaces are available on the R5F104AAASP#50?

The R5F104AAASP#50 provides UART (up to 4 channels), simplified SPI (CSI, up to 8 channels), and I²C (up to 10 channels) interfaces. All are implemented in hardware with independent baud rate generators and FIFO buffers. Pin multiplexing via peripheral I/O redirection registers allows flexible assignment - for example, UART0 can be mapped to P00/P01 or P16/P17. No CAN, USB, or Ethernet interfaces are included; these require external transceivers or different RL78 families.