Renesas R5F102A9ASP#V0

Overview

R5F102A9ASP#V0 from Renesas Electronics is a 30-pin LSSOP packaged RL78/G12 16-bit microcontroller designed for ultra-low-power embedded control in consumer and industrial applications. It integrates 16 KB code flash, 2 KB data flash, 2 KB RAM, 10-bit 8-channel ADC, 8-channel 16-bit TAU timer, UART/CSI/I²C serial interfaces, and operates from 1.8 V to 5.5 V with true low-power consumption (63 μA/MHz) - enabling use in battery-powered sensor nodes and smart home controllers.

For engineers reviewing the R5F102A9ASP#V0 datasheet, R5F102A9ASP#V0 pinout, R5F102A9ASP#V0 application, or R5F102A9ASP#V0 equivalent, key selection considerations include its 30-pin LSSOP package, integrated 2 KB data flash with background operation (BGO), DMA controller (2 channels), CRC hardware accelerator, and support for -40°C to +85°C ambient operation under consumer-grade qualification (A-suffix).

Technical Context

The R5F102A9ASP#V0 implements the RL78 CPU core with CISC architecture and 3-stage pipeline, delivering 31 DMIPS at 24 MHz. Its clock system combines a high-accuracy ±1.0% high-speed on-chip oscillator (1–24 MHz selectable) with external crystal support (1–20 MHz) and a 15 kHz low-speed on-chip oscillator for STOP/HALT modes.

Peripheral integration includes an 8-channel 16-bit timer array (TAU) with PWM capability, SAU0 supporting UART/CSI/I²C functions across dedicated channels, and hardware CRC for memory/data integrity - all accessible via configurable peripheral I/O redirection register (PIOR) to optimize pin assignment without PCB redesign.

Key Specifications

Pinout & Package

Package: 30-pin plastic LSSOP (7.62 mm × 5.2 mm, 0.65 mm pitch), RoHS-compliant, tape-and-reel (#V0, #X0, #50) or tray (#10, #30, #70) packaging.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F102A9ASP#V0, R5F103A9ASP#V0 removes critical data-logging and safety features (data flash, DMA, CRC), while R5F102AAASP#V0 offers identical functionality - making the latter a seamless upgrade path where higher code density or mask ROM assurance is preferred.

Availability

R5F102A9ASP#V0 is available at Aetrix Electronics and suitable for smart home hubs, portable medical devices, industrial HMIs, and energy metering subsystems requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for R5F102A9ASP#V0 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 Corporation is a global semiconductor leader headquartered in Tokyo, Japan, specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The RL78/G12 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, battery-operated, and safety-aware embedded control applications - emphasizing energy efficiency, integrated analog, and functional safety features like CRC and RAM guard.

FAQ

What is the maximum operating frequency and instruction throughput of the R5F102A9ASP#V0?

The R5F102A9ASP#V0 achieves a maximum system clock of 24 MHz using its high-speed on-chip oscillator, delivering 31 DMIPS of processing performance. Its minimum instruction execution time is 0.04167 μs at 24 MHz, enabled by the RL78's 3-stage pipeline CISC architecture - sufficient for real-time sensor fusion and control loop execution in resource-constrained edge nodes.

Does the R5F102A9ASP#V0 support in-system programming and data retention during firmware updates?

Yes, the R5F102A9ASP#V0 supports self-programming of code flash and background operation (BGO) of its 2 KB data flash. This allows firmware updates to occur while the application continues running - critical for fail-safe over-the-air (OTA) updates in deployed devices. The flash shield window function prevents unauthorized access to protected memory regions during reprogramming.

How does the R5F102A9ASP#V0 manage power in battery-powered applications?

The R5F102A9ASP#V0 implements three ultra-low-power modes: HALT (CPU stopped, peripherals active), STOP (all clocks halted except low-speed oscillator), and SNOOZE (selected peripherals remain active during deep sleep). With 63 μA/MHz active current and sub-μA STOP-mode current, it enables multi-year operation on CR2032 coin cells - especially when paired with its programmable clock/buzzer outputs for timed wake-up events.

What analog capabilities does the R5F102A9ASP#V0 provide for sensor interfacing?

The R5F102A9ASP#V0 integrates a 10-bit successive-approximation ADC with 8 input channels, internal 1.45 V reference voltage, and an on-chip temperature sensor. It supports single-ended and pseudo-differential conversions, with analog inputs tolerant up to VDD + 0.3 V - enabling direct connection to resistive sensors, thermistors, and bridge amplifiers without external signal conditioning.

Can the R5F102A9ASP#V0 replace older RL78/G10 or RL78/G13 MCUs in existing designs?

The R5F102A9ASP#V0 is not a pin-compatible replacement for RL78/G10 or RL78/G13 due to differences in pin count (30-pin LSSOP vs. 20/24-pin packages), peripheral mapping, and register layout. However, its software compatibility within the RL78 family - including shared toolchain, IDE support, and peripheral driver libraries - significantly reduces migration effort when upgrading from G10/G13 to G12 for enhanced data flash, DMA, or CRC functionality.