Renesas R5F10RJAAFA#X0

Overview

R5F10RJAAFA#X0 from Renesas is a 16-bit RL78/L12 microcontroller with integrated LCD controller/driver, 16 KB flash, 2 KB data flash, and 1 KB RAM, operating from 1.6 V to 5.5 V. It delivers 31 DMIPS at 24 MHz, achieves 62.5 µA/MHz active current and 0.64 µA RTC+LVD halt mode, and supports up to 35 seg × 8 com LCD drive for battery-powered consumer instrumentation.

For engineers reviewing the R5F10RJAAFA#X0 datasheet, R5F10RJAAFA#X0 pinout, R5F10RJAAFA#X0 application, or R5F10RJAAFA#X0 equivalent, key selection criteria include its ultra-low-power LCD-optimized architecture, on-chip 24 MHz ±1% oscillator, 10-bit ADC with internal 1.45 V reference, and support for capacitor-split LCD biasing in compact 52-pin LQFP (10 × 10 mm, 0.65 mm pitch).

Technical Context

The R5F10RJAAFA#X0 implements a Harvard-architecture 16-bit RL78 CPU core with 3-stage pipeline, executing 86% of instructions in 1–2 cycles. It integrates a dedicated LCD controller supporting three bias methods (capacitor split, internal boost, resistance division), full calendar RTC with alarm and correction, and dual-channel DMA for background data flash operations.

Its power management includes POR, 14-level LVD with interrupt/reset options, and multiple low-power modes: Stop (0.23 µA RAM-retained), Halt (0.64 µA with RTC+LVD), and Snooze mode for selective peripheral wake-up without full CPU restart - all validated across −40°C to +85°C ambient.

Key Specifications

Pinout & Package

Package: 52-pin plastic LQFP (10 × 10 mm, 0.65 mm pitch), RoHS-compliant, tape-and-reel (#X0).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F10RJAAFA#X0, the R5F10RJCAFA#X0 offers double flash capacity in identical packaging for seamless firmware scalability, while R5F10RFCAFP#X0 trades LCD segment count and pin density for a smaller footprint-making it viable only when display requirements shrink and layout revision is acceptable.

Availability

R5F10RJAAFA#X0 is available at Aetrix Electronics and suitable for smart energy meters, portable medical monitors, and home appliance control panels requiring stable component supply and long-term industrial availability.

Supply support for R5F10RJAAFA#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 is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The RL78/L12 product line is designed specifically for ultra-low-power LCD-based applications - integrating high-efficiency CPU, on-chip LCD driver, and robust safety features for consumer and industrial instrumentation.

FAQ

What is the maximum LCD segment count supported by the R5F10RJAAFA#X0?

The R5F10RJAAFA#X0 supports up to 35 segments × 8 commons or 39 segments × 4 commons, configurable via software. This is confirmed in the RL78/L12 datasheet Section 1.1 (Features) and Section 1.6 (Outline of Functions), where the 52-pin variant (R5F10RJx) is explicitly rated for 30 segment outputs with 8-com configuration. The R5F10RJAAFA#X0 implements this full capability in its 52-pin LQFP package.

Does the R5F10RJAAFA#X0 include an internal voltage reference for the ADC?

Yes, the R5F10RJAAFA#X0 includes an internal 1.45 V reference voltage (AVREFP/AVREFM) for the 10-bit ADC, enabling accurate analog measurements without external reference components. This is documented in Section 1.1 (Features) and Section 1.4 (Pin Identification) of the R01DS0157EJ0223 datasheet, and applies directly to the R5F10RJAAFA#X0 as a member of the RL78/L12 family.

What is the operating temperature range for the R5F10RJAAFA#X0?

The R5F10RJAAFA#X0 is rated for −40°C to +85°C ambient operation, as indicated by the "A" suffix in its part number per Figure 1-1 of the datasheet. This classification targets consumer applications and is validated across the full 1.6 V to 5.5 V supply range, with all specifications-including 24 MHz oscillator accuracy and LCD drive performance-guaranteed within this range.

Can the R5F10RJAAFA#X0 operate without an external crystal?

Yes, the R5F10RJAAFA#X0 can operate fully without an external crystal, using its on-chip 24 MHz high-speed oscillator with ±1% accuracy over voltage (1.8–5.5 V) and temperature (−20°C to 85°C). External crystals (X1/X2) are optional for higher precision timing; the internal oscillator is sufficient for most LCD-based applications including energy meters and appliance controls.

What low-power modes does the R5F10RJAAFA#X0 support, and what are their typical currents?

The R5F10RJAAFA#X0 supports Stop mode (0.23 µA RAM retained), Halt mode (0.64 µA with RTC + LVD enabled), and Snooze mode for selective peripheral wake-up. These values are specified in Section 1.1 (Features) of the datasheet and apply directly to the R5F10RJAAFA#X0 as a 52-pin, 16 KB flash variant in the RL78/L12 family. All modes are functional across the full −40°C to +85°C range.