Renesas R5F102A7ASP#X0

Overview

R5F102A7ASP#X0 from Renesas Electronics is a 30-pin LSSOP packaged RL78/G12 16-bit MCU with 4 KB code flash, 2 KB data flash, 512 B RAM, and integrated 10-bit A/D converter (8 channels), operating from 1.8 V to 5.5 V at –40°C to +85°C for consumer applications. It features dual UART, single CSI, single I²C, 8-channel 16-bit TAU timer, DMA controller, and high-accuracy ±1.0% on-chip oscillator up to 24 MHz.

For engineers reviewing the R5F102A7ASP#X0 datasheet, R5F102A7ASP#X0 pinout, R5F102A7ASP#X0 application, or R5F102A7ASP#X0 equivalent, key selection criteria include its 2 KB data flash with background operation, ultra-low power consumption (63 μA/MHz), 30-pin LSSOP package with REGC regulator capacitor support, and integrated CRC and RAM/SFR guard functions for robust embedded control.

Technical Context

The R5F102A7ASP#X0 implements the RL78 CPU core with 3-stage pipeline CISC architecture, 1 MB address space, and selectable instruction execution time (0.04167 μs @ 24 MHz). Its clock system integrates high-speed on-chip oscillator (1–24 MHz, ±1.0% accuracy), low-speed 15 kHz on-chip oscillator, and external crystal support (1–20 MHz).

Peripheral integration includes SAU0 with 4-channel UART/CSI/I²C capability (configured as UART0, UART1, CSI00, IIC00), 8-channel TAU0 timer with PWM output, 12-bit interval timer, window watchdog, and on-chip debug interface. The device supports SNOOZE mode for low-power serial communication wake-up and uses PIOR register for flexible peripheral pin assignment.

Key Specifications

Pinout & Package

Package: 30-pin plastic LSSOP (7.62 mm, 0.65-mm pitch), RoHS-compliant, with exposed pad not present. Requires 0.47–1 µF capacitor between REGC and VSS for voltage regulator stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F102A7ASP#X0, R5F102A8ASP#X0 offers scalable flash for future firmware expansion within identical footprint, while R5F103A7ASP#X0 sacrifices data retention and safety features to reduce BOM cost-making it suitable only for non-updatable, non-safety-critical designs.

Availability

R5F102A7ASP#X0 is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, smart meter interfaces, and medical diagnostic devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for R5F102A7ASP#X0 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 optimized for cost-sensitive, battery-operated, and general-purpose embedded control applications requiring integrated analog, communication, and safety features.

FAQ

What is the maximum operating frequency and instruction speed of the R5F102A7ASP#X0?

The R5F102A7ASP#X0 supports a maximum high-speed on-chip oscillator frequency of 24 MHz, enabling a minimum instruction execution time of 0.04167 μs. When using the external crystal oscillator, the maximum system clock is 20 MHz. Its RL78 CPU core achieves 31 DMIPS at 24 MHz, confirmed in the official Renesas datasheet R01DS0193EJ0250.

Does the R5F102A7ASP#X0 include data flash memory, and what are its endurance specifications?

Yes, the R5F102A7ASP#X0 includes 2 KB of data flash memory with background operation (BGO) capability, allowing program execution during write/erase cycles. It supports 1,000,000 erase/write cycles (typical) across the full 1.8–5.5 V operating voltage range, as specified in the RL78/G12 datasheet Section 1.1.

What are the supported low-power modes on the R5F102A7ASP#X0, and how do they differ?

The R5F102A7ASP#X0 supports HALT (CPU stopped, peripherals active), STOP (all clocks halted except low-speed oscillator), and SNOOZE (peripheral-triggered wake-up while CPU sleeps). SNOOZE mode enables UART/CSI/I²C to wake the CPU without full restart, reducing wake latency versus STOP mode-ideal for intermittent sensor polling.

Can the R5F102A7ASP#X0 operate without an external crystal, and what is the oscillator accuracy?

Yes, the R5F102A7ASP#X0 can operate solely using its high-speed on-chip oscillator, selectable from 1–24 MHz. Its accuracy is ±1.0% over –20°C to +85°C and ±2.0% over –40°C to +105°C, eliminating the need for external crystals in applications where timing precision is secondary to cost and board space.

What safety and reliability features are integrated into the R5F102A7ASP#X0?

The R5F102A7ASP#X0 integrates CRC calculation hardware, RAM guard, and SFR guard to detect memory corruption and unauthorized register access. These features, combined with on-chip voltage detector (12-level LVD), power-on-reset, and window watchdog timer, provide foundational functional safety for IEC 60730 Class B compliance in appliance control applications.