Renesas R5F10RLAGNB#20

Overview

R5F10RLAGNB#20 from Renesas is a 64-pin HWQFN-packaged 16-bit RL78/L12 microcontroller with 32 KB flash, 2 KB data flash, 1.5 KB RAM, integrated LCD controller/driver (up to 39 seg × 8 com), and ultra-low-power operation (0.64 µA in RTC+LVD halt mode). It delivers 31 DMIPS at 24 MHz and supports industrial temperature range (−40°C to +105°C), targeting battery-powered LCD instrumentation and energy metering.

For engineers reviewing the R5F10RLAGNB#20 datasheet, R5F10RLAGNB#20 pinout, R5F10RLAGNB#20 application, or R5F10RLAGNB#20 equivalent, key selection considerations include its 64-pin HWQFN (8 × 8 mm, 0.4 mm pitch) package, on-chip LCD drive capability with capacitor-split and internal-boost methods, 10-bit ADC with 1.6 V support, and IEC/UL 60730 safety features for certified embedded control.

Technical Context

The R5F10RLAGNB#20 implements the RL78 16-bit CISC Harvard architecture with 3-stage pipeline, enabling 86% of instructions in 1–2 clock cycles. Its dual-clock system integrates a ±1% accurate 24 MHz high-speed on-chip oscillator and a 32.768 kHz subsystem crystal oscillator for RTC.

It embeds a dedicated LCD controller supporting waveform types A/B, 16-step contrast adjustment, blinking, and three drive methods-capacitor split (0.12 µA), internal voltage boost (0.63 µA @ 3.0 V), and resistance division-alongside hardware CRC, RAM parity, SFR write protection, and illegal memory access detection for functional safety compliance.

Key Specifications

Pinout & Package

Package: 64-pin HWQFN (8 × 8 mm, 0.4 mm pitch), exposed die pad (EVSS/EVDD), compatible with reflow soldering and space-constrained industrial designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F10RLAGNB#20, R5F10RLCGNB#20 trades industrial temperature rating for identical functionality at lower cost, while R5F10RJCGFA#30 offers comparable memory and peripherals in a larger, less dense package with reduced LCD segment capacity-neither is pin-compatible, requiring PCB redesign.

Availability

R5F10RLAGNB#20 is available at Aetrix Electronics and suitable for energy metering, industrial panel meters, portable medical devices, and smart thermostats requiring stable component supply across extended product lifecycles.

Supply support for R5F10RLAGNB#20 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 targets ultra-low-power LCD-based applications, integrating high-efficiency core, on-chip LCD controller, and functional safety features for certified embedded instrumentation.

FAQ

What is the maximum LCD segment count supported by the R5F10RLAGNB#20?

The R5F10RLAGNB#20 supports up to 39 segment outputs and 8 common outputs, enabling configurations such as 39 seg × 8 com or 35 seg × 8 com depending on display wiring. This capability is confirmed in the RL78/L12 datasheet section 1.5.5 and Table 1-1 for 64-pin HWQFN variants. The R5F10RLAGNB#20 achieves this using its integrated LCD controller with configurable drive methods including capacitor-split and internal voltage boost.

Does the R5F10RLAGNB#20 require an external crystal oscillator?

The R5F10RLAGNB#20 does not require an external crystal oscillator for basic operation, as it includes a ±1% accurate 24 MHz high-speed on-chip oscillator usable across 1.8–5.5 V and −20°C to +85°C. However, an external crystal (X1/X2) is required for full 24 MHz accuracy over the full industrial temperature range (−40°C to +105°C) and for RTC precision via the 32.768 kHz subsystem oscillator (XT1/XT2). The R5F10RLAGNB#20 datasheet specifies both options.

What safety certifications does the R5F10RLAGNB#20 support out of the box?

The R5F10RLAGNB#20 includes hardware-level safety features aligned with IEC/UL 60730 Class B requirements, including flash memory CRC calculation, RAM parity error checking, SFR write protection, illegal memory access detection, and clock frequency monitoring. These are implemented in silicon and documented in the RL78/L12 datasheet section 1.1 Features. No additional external components are needed to enable these functions, though software configuration is required to activate them in the R5F10RLAGNB#20 firmware.

How much current does the R5F10RLAGNB#20 draw during LCD operation using the capacitor-split method?

The R5F10RLAGNB#20 draws 0.12 µA for LCD operation when using the capacitor-split drive method, as specified in the RL78/L12 datasheet section 1.1 Features. This ultra-low current enables multi-year battery life in portable instruments. The value is measured under typical conditions (VDD = 3.0 V, room temperature) and applies specifically to the R5F10RLAGNB#20's 64-pin HWQFN variant with its integrated LCD controller configured for capacitor-split operation.

What is the purpose of the EVSS and EVDD pins on the R5F10RLAGNB#20?

The EVSS and EVDD pins on the R5F10RLAGNB#20 provide separate power and ground domains for analog and LCD circuitry to minimize noise coupling into sensitive analog sections. Per the RL78/L12 datasheet section 1.3.5, EVSS must be held at the same potential as VSS, and EVDD at the same potential as VDD-but routing them on separate PCB planes improves EMI performance. This separation is especially valuable in precision measurement applications where the R5F10RLAGNB#20's 10-bit ADC and LCD driver coexist on one die.