Renesas R5F103A9ASP#70

Overview

R5F103A9ASP#70 from Renesas Electronics is a 30-pin LSSOP packaged RL78/G12 16-bit MCU 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 with on-chip high-speed oscillator (1–24 MHz, ±5% accuracy). It targets battery-powered sensor nodes and appliance control panels requiring deterministic real-time response at <63 μA/MHz.

For engineers reviewing the R5F103A9ASP#70 datasheet, R5F103A9ASP#70 pinout, R5F103A9ASP#70 application, or R5F103A9ASP#70 equivalent, this page delivers verified specifications, validated 30-pin LSSOP terminal mapping, confirmed peripheral configuration (no data flash, no DMA, no simplified I²C), and two technically documented alternative parts for design continuity and sourcing flexibility.

Technical Context

The R5F103A9ASP#70 implements the RL78 CPU core with 3-stage pipeline CISC architecture, 1 MB address space, and dual-clock domain operation: high-speed on-chip oscillator (1–24 MHz, ±5% over –40°C to +85°C) and 15 kHz low-speed on-chip oscillator. Its power management includes HALT, STOP, and SNOOZE modes, enabling sub-μA retention in battery-backed systems.

Peripheral integration is optimized for cost-sensitive control: one UART channel (RxD0/TxD0), one CSI channel (SCK00/SI00/SO00), no I²C master/slave support, and TAU0 timer with 8 independent channels supporting PWM, input capture, and interval timing. The absence of data flash memory and DMA distinguishes it from R5F102Ax variants and constrains firmware update and background data logging capability.

Key Specifications

Pinout & Package

Package: 30-pin plastic LSSOP (7.62 mm, 0.65-mm pitch), JEDEC MS-013AC compliant, thermal pad not present. Pin 1 marked by index notch; REGC requires 0.47–1 µF capacitor to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F103A9ASP#70, R5F102AAASP#70 adds safety peripherals and nonvolatile data storage at the cost of higher BOM cost and qualification effort, while R5F103AAASP#70 provides headroom for firmware expansion within identical power, timing, and interface boundaries.

Availability

R5F103A9ASP#70 is available at Aetrix Electronics and suitable for home appliance control panels, wireless sensor nodes, industrial motor starters, and smart power outlets requiring stable component supply across extended production lifecycles.

Supply support for R5F103A9ASP#70 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 targeting cost-sensitive, battery-operated, and safety-aware embedded control applications where energy efficiency and peripheral integration outweigh raw processing throughput.

FAQ

What is the maximum operating frequency and accuracy of the on-chip oscillator in R5F103A9ASP#70?

The R5F103A9ASP#70 features a high-speed on-chip oscillator configurable from 1 MHz to 24 MHz, with ±5.0% frequency accuracy over the full operating temperature range of –40°C to +85°C. This specification is confirmed in Section 1.3.2(2) of the R01DS0193EJ0250 datasheet and applies specifically to R5F103-series devices. No external crystal is required for basic timing, though X1/X2 pins remain available for precision clocking if needed.

Does R5F103A9ASP#70 include data flash memory or DMA controller functionality?

No, the R5F103A9ASP#70 does not include data flash memory or a DMA controller. As explicitly stated in Section 1.3.1 and Table 1-1 of the datasheet, R5F103 products omit the 2 KB data flash present in R5F102 variants and lack the 2-channel DMA found in those counterparts. This simplifies the peripheral set and reduces cost but requires software-managed data buffering and flash writes.

How many UART and I²C interfaces does R5F103A9ASP#70 support?

The R5F103A9ASP#70 supports exactly one UART channel (UART0 on P11/RxD0 and P12/TxD0) and zero I²C interfaces. Although pins P10 and P11 are labeled with SCL00/SDA00 alternate functions in the pin diagram, Section 1.3.3 and Table 1-1 confirm that simplified I²C is not mounted on any R5F103 product - only R5F102 variants include it. CSI00 remains fully functional as a SPI-like interface.

What is the ADC resolution, channel count, and reference voltage configuration for R5F103A9ASP#70?

The R5F103A9ASP#70 integrates an 8-channel, 10-bit successive-approximation ADC with selectable reference sources: internal 1.45 V reference or external AVREFP/AVREFM inputs. Channel mapping includes ANI0–ANI3 and ANI16–ANI19 (totaling 8), and the ADC operates across the full 1.8–5.5 V VDD range. This configuration is specified in Sections 1.1 and 1.7 of the datasheet and validated for use in precision sensor interfacing.

Is R5F103A9ASP#70 pin-compatible with other RL78/G12 30-pin LSSOP variants?

Yes, the R5F103A9ASP#70 shares identical 30-pin LSSOP (PLSP0030JB-B) packaging and pinout with all other 30-pin RL78/G12 devices including R5F102AAASP#70 and R5F103AAASP#70. Mechanical compatibility is guaranteed per Figure 1-1 and Table 1-1; however, functional pin behavior differs - for example, P10/P11 support I²C only on R5F102 parts, not on R5F103A9ASP#70.