Renesas R5F10RLCGNB#20

Overview

R5F10RLCGNB#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 targets battery-powered LCD display systems such as smart meters, thermostats, and portable medical devices.

For engineers reviewing the R5F10RLCGNB#20 datasheet, R5F10RLCGNB#20 pinout, R5F10RLCGNB#20 application, or R5F10RLCGNB#20 equivalent, key selection criteria include its 64-pin HWQFN (8 × 8 mm, 0.4 mm pitch) package, industrial-grade −40°C to +105°C operation, on-chip LCD drive capability with capacitor-split and internal-boost methods, and 31 DMIPS performance at 24 MHz.

Technical Context

The R5F10RLCGNB#20 implements the RL78 CPU core with Harvard architecture, 3-stage pipeline, and CISC instruction set enabling 86% of instructions in 1–2 clock cycles. It integrates a high-speed on-chip oscillator (24 MHz ±1% over voltage/temperature) and supports external crystal inputs (X1/X2 for main clock, XT1/XT2 for subsystem).

Its peripheral set includes an 8-channel timer array unit, 10-bit ADC with 10 channels and internal 1.45 V reference, dual DMA channels, UART/I²C/CSI interfaces, real-time clock with calendar/alarm, and dedicated LCD segment/common drivers with contrast adjustment and blinking control - all optimized for low-voltage (1.6–5.5 V) LCD-centric embedded applications.

Key Specifications

Pinout & Package

Package: HWQFN-64 (8 × 8 mm, 0.4 mm pitch) with exposed thermal pad. Requires REGC-to-VSS decoupling capacitor (0.47–1 µF). EVDD and EVSS must be tied to VDD and VSS respectively unless separate analog power routing is implemented.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F10RLAGNB#20 and R5F10RJCGFA#30, the R5F10RLCGNB#20 offers maximum LCD segment capacity (39×8), largest flash (32 KB), and lowest system-level power in RTC+LVD mode - making it optimal for next-generation battery-powered LCD HMI with extended feature sets.

Availability

R5F10RLCGNB#20 is available at Aetrix Electronics and suitable for smart metering, industrial HMI, portable medical devices, and appliance control panels requiring stable component supply, long-term lifecycle support, and industrial-temperature reliability.

Supply support for R5F10RLCGNB#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 is engineered for ultra-low-power LCD-based applications, integrating high-efficiency CPU, on-chip LCD driver, and robust analog peripherals to minimize external components and extend battery life.

FAQ

What is the operating temperature range for the R5F10RLCGNB#20?

The R5F10RLCGNB#20 is rated for industrial operation from −40°C to +105°C, as indicated by the 'G' suffix in its part number. This makes it suitable for deployment in harsh environments such as utility metering enclosures, factory-floor thermostats, and outdoor appliance control panels where ambient temperatures exceed consumer-grade limits.

Does the R5F10RLCGNB#20 support external crystal oscillators for both main and subsystem clocks?

Yes, the R5F10RLCGNB#20 supports dual crystal configurations: main system clock via X1/P121 and X2/P122 (1–20 MHz), and subsystem clock via XT1/P123 and XT2/P124 (32.768 kHz). This enables precise RTC operation independent of CPU activity and supports applications requiring accurate timekeeping alongside low-power sleep modes.

How many LCD segments and commons does the R5F10RLCGNB#20 support, and what drive methods are available?

The R5F10RLCGNB#20 supports up to 39 segments and 8 commons (39 × 8 configuration). It implements three LCD drive methods: capacitor-split, internal voltage boost, and external resistance division - selectable via register settings to match display glass requirements and optimize power versus contrast.

What is the significance of the 'NB' in R5F10RLCGNB#20?

The 'NB' in R5F10RLCGNB#20 denotes the HWQFN package type (8 × 8 mm, 0.4 mm pitch) with an exposed thermal pad. This package provides superior thermal performance and compact footprint compared to LQFP alternatives, and requires proper soldering of the exposed pad to ground for reliable operation and heat dissipation.

Can the R5F10RLCGNB#20 operate from a single 1.6 V supply, and what peripherals remain functional at that voltage?

Yes, the R5F10RLCGNB#20 operates from 1.6 V to 5.5 V. At 1.6 V, the 10-bit ADC (with internal 1.45 V reference), 32 KB flash, 2 KB data flash, 1.5 KB RAM, RTC, and LCD controller remain fully functional - enabling operation from single alkaline or lithium primary cells without voltage boosting.