Renesas R5F103A7ASP#30

Overview

R5F103A7ASP#30 from Renesas Electronics is a 30-pin LSSOP ultra-low-power 16-bit RL78/G12 microcontroller designed for cost-sensitive consumer applications. It features 2 KB code flash, 256 B RAM, 8-channel 10-bit ADC, 1 UART channel, and operates from 1.8 V to 5.5 V across –40°C to +85°C ambient temperature - enabling use in battery-powered remote controls and smart home sensors.

For engineers reviewing the R5F103A7ASP#30 datasheet, R5F103A7ASP#30 pinout, R5F103A7ASP#30 application, or R5F103A7ASP#30 equivalent, key selection criteria include its absence of data flash memory, single UART interface, lack of DMA and CRC hardware, and ±5.0% high-speed on-chip oscillator accuracy over full temperature range - critical for timing-critical but non-safety-critical embedded control tasks.

Technical Context

The R5F103A7ASP#30 implements the RL78 CPU core with 3-stage pipeline CISC architecture, supporting instruction execution times from 0.04167 µs (at 24 MHz on-chip oscillator) to 1 µs (at 1 MHz), and 1 MB address space. Its peripheral set excludes DMA, CRC, and safety guard functions present in R5F102 variants.

It integrates a 12-bit interval timer, window watchdog timer, low-speed 15 kHz on-chip oscillator, and voltage detector with 12 selectable reset thresholds. The 30-pin LSSOP package supports 26 I/O pins including 9 N-ch open-drain outputs with VDD tolerance, enabling direct interfacing with 1.8/2.5/3.3 V logic without level shifters.

Key Specifications

Pinout & Package

Package: 30-pin plastic LSSOP (7.62 mm, 0.65-mm pitch), RoHS-compliant, surface-mountable with standard reflow profile.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F103A7ASP#30, R5F102A7ASP#30 adds data flash and safety peripherals for robust field updates, while R5F103AAASP#30 scales memory for complex firmware - both maintain identical 30-pin LSSOP footprint and consumer-grade temperature rating.

Availability

R5F103A7ASP#30 is available at Aetrix Electronics and suitable for remote controls, smart home sensors, LED lighting controllers, and appliance UI panels requiring stable component supply across production lifecycles.

Supply support for R5F103A7ASP#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 global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The RL78/G12 product line targets cost-optimized, ultra-low-power general-purpose embedded control - balancing performance, energy efficiency, and integration for consumer electronics and white goods.

FAQ

What is the maximum operating frequency of the R5F103A7ASP#30?

The R5F103A7ASP#30 supports a maximum system clock of 24 MHz using its high-speed on-chip oscillator. This frequency is achievable across the full operating voltage range (1.8 V to 5.5 V) and ambient temperature (–40°C to +85°C), delivering 31 DMIPS performance. External crystal operation is limited to 20 MHz per datasheet specifications.

Does the R5F103A7ASP#30 include data flash memory?

No, the R5F103A7ASP#30 does not include data flash memory. As confirmed in Section 1.3.1 of the RL78/G12 datasheet, data flash (2 KB) is exclusive to R5F102-series parts. The R5F103A7ASP#30 relies solely on its 2 KB code flash for program storage and runtime variables must be managed in its 256 B RAM.

How many UART interfaces does the R5F103A7ASP#30 support?

The R5F103A7ASP#30 supports one dedicated UART channel (UART0). While pins such as P01 and P14 can be configured for UART1 or UART2 via peripheral I/O redirection, the underlying hardware only implements a single UART module - limiting concurrent UART operation to one instance at a time.

What is the purpose of the REGC pin on the R5F103A7ASP#30?

The REGC pin on the R5F103A7ASP#30 connects to the internal voltage regulator's stabilization capacitor. Per datasheet requirement, it must be tied to VSS through a 0.47 µF to 1 µF ceramic capacitor. This capacitor ensures stable operation of the internal LDO that powers analog and clock circuitry - omitting it risks ADC inaccuracy and oscillator instability.

Is the R5F103A7ASP#30 pin-compatible with other RL78/G12 30-pin variants?

Yes, the R5F103A7ASP#30 shares identical pinout and LSSOP-30 package with all other RL78/G12 30-pin parts including R5F102Ax, R5F103Ax, and R5F103AA series. However, functional differences exist: R5F102Ax parts add data flash, DMA, and CRC; R5F103AA increases flash to 16 KB - requiring firmware validation despite mechanical compatibility.