Renesas R5F103A9ASP#30

Overview

R5F103A9ASP#30 from Renesas Electronics is a 30-pin LSSOP packaged 16-bit RL78/G12 microcontroller designed for ultra-low-power embedded control in consumer-grade applications (–40°C to +85°C). It integrates 8 KB code flash, 768 B RAM, 10-bit 8-channel ADC, 8-channel 16-bit TAU timer, and single UART/CSI/I²C serial interfaces - enabling compact sensor node and appliance control designs.

For engineers reviewing the R5F103A9ASP#30 datasheet, R5F103A9ASP#30 pinout, R5F103A9ASP#30 application, or R5F103A9ASP#30 equivalent, key selection criteria include its 1.8–5.5 V operation, absence of data flash memory, lack of DMA and safety functions (CRC/RAM guard), and confirmed 30-pin LSSOP-30 package with REGC capacitor requirement.

Technical Context

The R5F103A9ASP#30 implements the RL78 CPU core with 3-stage pipeline CISC architecture, delivering 31 DMIPS at 24 MHz while consuming only 63 μA/MHz in active mode. Its clock system combines a high-speed on-chip oscillator (±5% accuracy over –40°C to +85°C) and external crystal support (1–20 MHz), but omits the data flash memory and DMA controller found in R5F102A-series counterparts.

Peripheral configuration is fixed per pinout: it provides exactly one UART channel (RxD0/TxD0), one simplified SPI (CSI00), one simplified I²C (IIC00), eight 16-bit timer channels (TAU0 ch0–ch7), and eight analog inputs (ANI0–ANI3, ANI16–ANI19), all operating within the 1.8–5.5 V supply range and requiring REGC-to-VSS decoupling.

Key Specifications

Pinout & Package

Package: 30-pin plastic LSSOP (7.62 mm, 0.65-mm pitch), JEDEC PLSP0030JB-B footprint. Requires 0.47–1 µF capacitor between REGC and VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F102AAASP#30, the R5F103A9ASP#30 trades data flash and safety features for lower cost and reduced firmware complexity; compared with R5F103AAASP#30, it offers identical peripherals and timing performance at lower memory cost for stable, mature firmware deployments.

Availability

R5F103A9ASP#30 is available at Aetrix Electronics and suitable for smart appliance control, wireless sensor nodes, industrial HMI panels, and home automation gateways requiring stable component supply across production lifecycles.

Supply support for R5F103A9ASP#30 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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power management ICs for automotive, industrial, and IoT markets.

The RL78/G12 product line delivers true low-power 16-bit MCUs optimized for cost-sensitive, battery-operated, and general-purpose embedded control applications requiring robust analog integration and minimal external components.

FAQ

What is the maximum operating frequency and instruction throughput of the R5F103A9ASP#30?

The R5F103A9ASP#30 operates at up to 24 MHz using its high-speed on-chip oscillator, achieving 31 DMIPS performance. Minimum instruction execution time is 0.04167 μs at 24 MHz, and the RL78 CPU core supports CISC instructions with 3-stage pipeline execution. The R5F103A9ASP#30 does not support external crystal frequencies above 20 MHz in HS mode.

Does the R5F103A9ASP#30 include data flash memory?

No, the R5F103A9ASP#30 does not include data flash memory. This is a defining distinction from the R5F102A-series variants. All R5F103 products omit the 2 KB data flash found in R5F102 parts, meaning non-volatile parameter storage must be implemented externally via EEPROM or serial flash when required by the application.

What are the critical power supply requirements for the R5F103A9ASP#30?

The R5F103A9ASP#30 requires a 1.8–5.5 V VDD supply and mandates a 0.47–1 µF capacitor between the REGC pin and VSS. Failure to install this capacitor results in unstable internal voltage regulation and unpredictable reset behavior. The device also includes an on-chip POR circuit triggered at ~1.51 V and a configurable voltage detector with 12 selectable thresholds.

Which serial communication interfaces are supported on the R5F103A9ASP#30?

The R5F103A9ASP#30 supports exactly one UART channel (RxD0/TxD0), one simplified SPI interface (CSI00), and one simplified I²C interface (IIC00). Unlike R5F102A variants, it lacks additional CSI/IIC channels and has no DMA support for serial transfers - all communication must be handled via interrupt-driven or polled software routines.

How many analog input channels does the R5F103A9ASP#30 provide, and what is their resolution?

The R5F103A9ASP#30 provides eight analog input channels (ANI0–ANI3 and ANI16–ANI19) with 10-bit resolution. It supports internal 1.45 V reference voltage and includes a temperature sensor. The ADC operates across the full 1.8–5.5 V supply range, and analog inputs tolerate voltages up to AVREF(+) + 0.3 V, making it suitable for direct sensor interfacing without external signal conditioning in most cases.