Renesas R5F104AEASP#X0

Overview

R5F104AEASP#X0 from Renesas is a 40-pin LSSOP-packaged 16-bit RL78/G14 microcontroller with 48 KB flash, 5.5 KB RAM, and 4 KB data flash, operating from 1.6–5.5 V. 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 (16 channels), UART/SPI/I²C interfaces, RTC, and on-chip debug for embedded control in battery-powered industrial sensors.

For engineers reviewing the R5F104AEASP#X0 datasheet, R5F104AEASP#X0 pinout, R5F104AEASP#X0 application, or R5F104AEASP#X0 equivalent, key selection criteria include its 40-pin LSSOP-0.65mm package, 48 KB code flash with self-programming, 10-bit ADC resolution across 16 analog inputs, and support for LIN-bus-capable UARTs in consumer-grade (-40 to +85°C) operation.

Technical Context

The R5F104AEASP#X0 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 ultra-low-speed mode). It includes dedicated hardware blocks: Data Transfer Controller (DTC) for interrupt-triggered memory transfers, Event Link Controller (ELC) for 19–26 peripheral event routing, and background operation (BGO) for concurrent data flash rewriting while executing program code.

Power management integrates on-chip POR, 14-level voltage detector (LVD) with interrupt/reset options, and multiple low-power states-HALT (CPU stop, peripherals active), STOP (all clocks halted except sub-system clock), and SNOOZE (selective peripheral wake-up during low-power sleep). The high-accuracy ±1.0% on-chip oscillator supports 12 selectable frequencies from 1–64 MHz without external crystals.

Key Specifications

Pinout & Package

Package: 40-pin LSSOP (7.62 mm, 0.65 mm pitch), lead-free, RoHS-compliant. Pin count and pitch match JEDEC MS-012AC standard; 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 R5F104BEASP#X0 and R5F104CEASP#X0, the R5F104AEASP#X0 provides optimal balance of memory (48 KB flash), ultra-low-power operation (0.60 μA STOP), and 40-pin LSSOP footprint-making it ideal for mid-complexity battery-powered devices needing field-upgradable firmware and precision analog sensing without over-provisioning resources.

Availability

R5F104AEASP#X0 is available at Aetrix Electronics and suitable for smart energy meters, industrial sensor nodes, and home appliance controls requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for R5F104AEASP#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/G14 product line delivers true low-power embedded control with integrated analog peripherals, targeting battery-operated and energy-conscious applications such as metering, sensing, and appliance control.

FAQ

What is the maximum operating frequency and performance rating of the R5F104AEASP#X0?

The R5F104AEASP#X0 operates at up to 32 MHz with a performance rating of 44 DMIPS. Its RL78 CPU core achieves this using a 3-stage pipeline CISC architecture and supports variable instruction execution times-from 0.03125 μs in high-speed mode to 30.5 μs in ultra-low-speed 32.768 kHz mode. This flexibility allows the R5F104AEASP#X0 to optimize processing throughput versus power consumption dynamically based on real-time system demands.

Does the R5F104AEASP#X0 support in-system programming and secure firmware updates?

Yes, the R5F104AEASP#X0 supports full in-system programming via its on-chip debug interface and includes robust security features for firmware updates. It implements self-programming with boot swap functionality to enable fail-safe firmware upgrades, plus a flash shield window that prevents unauthorized erasure or rewriting of protected memory regions. These capabilities make the R5F104AEASP#X0 suitable for deployed devices requiring field updates and IP protection.

How many analog input channels and what ADC resolution does the R5F104AEASP#X0 provide?

The R5F104AEASP#X0 integrates a 10-bit successive-approximation ADC with 16 analog input channels (ANI0–ANI15), plus two additional dedicated analog inputs (ANI16/ANI17 on P00/P01). It includes an internal 1.45 V reference voltage and an on-chip temperature sensor, enabling accurate sensor measurements without external references. All 16 channels share the same 10-bit resolution and operate across the full 1.6–5.5 V supply range.

What low-power modes are available on the R5F104AEASP#X0, and what is the lowest achievable current draw?

The R5F104AEASP#X0 offers HALT, STOP, and SNOOZE low-power modes. In STOP mode-with only the real-time clock (RTC) and low-voltage detector (LVD) active-the device draws just 0.60 μA (typical) at VDD = 1.8–5.5 V and TA = –40 to +85°C. This ultra-low quiescent current enables multi-year battery operation in applications like utility meters and wireless sensors, while retaining full RTC functionality and fast wake-up response.

Is the R5F104AEASP#X0 pin-compatible with other RL78/G14 variants in the same package?

Yes, the R5F104AEASP#X0 is pin-compatible with all other RL78/G14 microcontrollers in the 40-pin LSSOP package (e.g., R5F104BEASP#X0, R5F104CEASP#X0), sharing identical pin count, pitch (0.65 mm), mechanical outline, and signal mapping. This allows direct substitution within the same footprint for memory-scaling or cost-optimization without PCB redesign-provided software accommodates differences in flash/RAM size and peripheral enablement.