Renesas R5F102A8ASP#V0

Overview

R5F102A8ASP#V0 from Renesas Electronics is a 30-pin LSSOP packaged RL78/G12 16-bit MCU with 8 KB code flash, 2 KB data flash, 512 B RAM, 10-bit 8-channel ADC, and dual UART/CSI/I²C serial interfaces - deployed in battery-powered industrial sensors and low-power metering systems.

For engineers reviewing the R5F102A8ASP#V0 datasheet, R5F102A8ASP#V0 pinout, R5F102A8ASP#V0 application, or R5F102A8ASP#V0 equivalent, key selection criteria include its 1.8–5.5 V operation, HALT/STOP/SNOOZE low-power modes, on-chip CRC and RAM guard safety features, and 30-pin LSSOP package compatibility with space-constrained PCB layouts.

Technical Context

The R5F102A8ASP#V0 implements the RL78 CPU core with 3-stage pipeline CISC architecture, supporting 0.04167 µs minimum instruction execution at 24 MHz via high-accuracy ±1.0% on-chip oscillator (–20 to +85°C). It integrates two DMA channels for background data flash rewriting while executing code from program memory.

Its peripheral set includes TAU0 timer with 8 channels (7 PWM-capable), SAU0 with 4-channel serial interface support (UART0/CSI00/IIC00), and dedicated low-speed 15 kHz watchdog timer - all operating under single-supply 1.8–5.5 V with voltage detector interrupt/reset across 12 selectable thresholds.

Key Specifications

Pinout & Package

Package: 30-pin plastic LSSOP (7.62 mm × 4.4 mm, 0.65-mm pitch), RoHS-compliant, tape-and-reel (#V0).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F102A7ASP#V0, the R5F102A8ASP#V0 provides double code flash and RAM for enhanced feature sets; versus R5F103A8ASP#V0, it adds critical safety and data retention capabilities essential for industrial deployments.

Availability

R5F102A8ASP#V0 is available at Aetrix Electronics and suitable for smart utility metering, industrial sensor nodes, home appliance control, and portable medical diagnostics requiring stable component supply and long-term lifecycle support.

Supply support for R5F102A8ASP#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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power management ICs for automotive, industrial, and IoT markets.

The RL78/G12 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, battery-operated industrial and consumer equipment requiring robust peripheral integration and functional safety features.

FAQ

What is the maximum operating frequency of the R5F102A8ASP#V0?

The R5F102A8ASP#V0 supports up to 24 MHz operation using its high-accuracy on-chip oscillator (±1.0% over –20 to +85°C) or up to 20 MHz with external crystal (X1). Its minimum instruction execution time is 0.04167 µs at 24 MHz, enabling real-time response in time-critical control loops. The R5F102A8ASP#V0 maintains full functionality across its 1.8–5.5 V supply range at these speeds.

Does the R5F102A8ASP#V0 include an integrated temperature sensor?

Yes, the R5F102A8ASP#V0 includes an on-chip temperature sensor usable via the 10-bit ADC. It provides calibrated readings referenced to the internal 1.45 V bandgap voltage, enabling thermal monitoring and compensation without external components. This sensor is accessible through dedicated ANI channels and is supported in all operating modes including HALT and STOP - critical for ambient condition awareness in R5F102A8ASP#V0-based designs.

What safety features are implemented in the R5F102A8ASP#V0?

The R5F102A8ASP#V0 integrates CRC calculation hardware, RAM guard, and SFR guard to detect memory corruption and unauthorized register access. These features meet basic functional safety requirements for industrial control applications. Unlike the R5F103A8ASP#V0, the R5F102A8ASP#V0 retains these protections alongside its 2 KB data flash - making it suitable for designs requiring both data integrity and runtime fault detection without external safety monitors.

Can the R5F102A8ASP#V0 operate from a 1.8 V supply?

Yes, the R5F102A8ASP#V0 operates across a 1.8 V to 5.5 V supply range, supporting direct interfacing with 1.8 V logic families and enabling use in ultra-low-voltage battery systems. At 1.8 V, it supports up to 8 MHz main system clock (LS mode) and maintains full peripheral functionality including ADC, timers, and serial interfaces - verified per Renesas Electrical Specifications (R01DS0193EJ0250).

What is the purpose of the REGC pin on the R5F102A8ASP#V0?

REGC is the regulator capacitance pin for the internal voltage regulator. It must be connected to VSS via a 0.47 µF to 1 µF capacitor to stabilize the core voltage and ensure reliable operation - especially during transitions between low-power modes. Failure to properly decouple REGC may cause erratic resets or ADC inaccuracies. This requirement is specific to 30-pin RL78/G12 variants like the R5F102A8ASP#V0 and is documented in Section 1.4.3 of the datasheet.