Renesas R5F103A7ASP#V0

Overview

R5F103A7ASP#V0 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 2 KB code flash, 256 B RAM, 8-channel 10-bit A/D converter, single UART channel, and operates at 1.8–5.5 V with 63 μA/MHz active current consumption.

For engineers reviewing the R5F103A7ASP#V0 datasheet, R5F103A7ASP#V0 pinout, R5F103A7ASP#V0 application, or R5F103A7ASP#V0 equivalent, key selection criteria include its 30-pin LSSOP package, absence of data flash memory, single UART interface, 8-channel ADC, and suitability for cost-sensitive, low-power sensor and appliance control designs where peripheral count and flash size are constrained.

Technical Context

The R5F103A7ASP#V0 implements the RL78 CPU core with CISC architecture and 3-stage pipeline, delivering 31 DMIPS at 24 MHz while supporting instruction execution times from 0.04167 μs (24 MHz on-chip oscillator) to 1 μs (1 MHz). Its clock system includes a high-speed on-chip oscillator (±5.0% accuracy over –40°C to +85°C) and supports external crystal up to 20 MHz.

It features 26 I/O pins including 9 CMOS I/O with on-chip pull-up, 2 N-ch open-drain I/O (6 V tolerant), and analog inputs ANI0–ANI3 and ANI16–ANI19. Peripheral set excludes DMA, CRC, safety guards, and data flash-distinguishing it from R5F102-series variants-and provides one UART, one simplified SPI (CSI), no simplified I²C, and an 8-channel 10-bit A/D converter with internal 1.45 V reference.

Key Specifications

Pinout & Package

Package: 30-pin plastic LSSOP (7.62 mm, 0.65-mm pitch), RoHS-compliant, tray packaging (#V0).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F103A7ASP#V0, the R5F103A8ASP#V0 offers scalable firmware headroom without changing pinout or peripherals, while the R5F102AAASP#V0 adds data flash and safety features at the cost of higher BOM complexity and price-making R5F103A7ASP#V0 optimal for fixed-function, cost-constrained designs.

Availability

R5F103A7ASP#V0 is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, and consumer IoT remotes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for R5F103A7ASP#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 true low-power 16-bit MCUs targeting cost-sensitive, battery-operated, and general-purpose embedded control applications with integrated analog, timing, and communication peripherals.

FAQ

What is the maximum operating frequency of the R5F103A7ASP#V0?

The R5F103A7ASP#V0 supports a maximum system clock frequency of 24 MHz using its high-speed on-chip oscillator. When using an external crystal, the maximum supported frequency is 20 MHz in HS mode (VDD ≥ 2.7 V) or 16 MHz (VDD ≥ 2.4 V). Instruction execution time ranges from 0.04167 μs at 24 MHz to 1 μs at 1 MHz, enabling flexible performance/power trade-offs in the R5F103A7ASP#V0 design.

Does the R5F103A7ASP#V0 include data flash memory?

No, the R5F103A7ASP#V0 does not include data flash memory. As confirmed in the RL78/G12 datasheet Section 1.3.1, R5F103-series devices omit the 2 KB data flash present in R5F102-series parts. This makes the R5F103A7ASP#V0 appropriate for applications where parameter storage is handled externally or via code flash emulation, but unsuitable for designs requiring guaranteed 1,000,000-cycle nonvolatile data logging.

What are the UART and SPI capabilities of the R5F103A7ASP#V0?

The R5F103A7ASP#V0 provides exactly one UART channel and one simplified SPI (CSI) channel. It does not support simplified I²C. The UART supports standard asynchronous communication with RxD/TxD pins, while the CSI interface operates in master/slave mode with SCK/SI/SO signals. Both interfaces are software-configurable via the peripheral I/O redirection register (PIOR), and their pin assignments are shared with other functions like timer I/O and buzzer output.

What is the analog input capability of the R5F103A7ASP#V0?

The R5F103A7ASP#V0 integrates an 8-channel, 10-bit successive-approximation A/D converter with internal 1.45 V reference voltage. Supported analog inputs are ANI0–ANI3 and ANI16–ANI19. The device accepts input voltages from AVREFM to AVREFP (typically 0 V to 1.45 V) and supports single-ended conversion only. No differential input or external reference option is available on this variant.

Is the R5F103A7ASP#V0 pin-compatible with other RL78/G12 30-pin variants?

Yes, the R5F103A7ASP#V0 shares the same 30-pin LSSOP package (PLSP0030JB-B) and identical pin configuration with all other R5F103Ax and R5F102Ax 30-pin variants, including R5F103A8ASP#V0 and R5F102AAASP#V0. Pin functions are consistent across the family, though peripheral availability (e.g., data flash, DMA, simplified I²C) differs by part number-requiring firmware validation when substituting within the same package.