Renesas R5F10277GNA#25

Overview

R5F10277GNA#25 from Renesas Electronics is a 24-pin HWQFN-packaged RL78/G12 16-bit microcontroller designed for industrial embedded control at extended temperature (–40°C to +105°C). It integrates 4 KB code flash, 2 KB data flash, 512 B RAM, 10-bit A/D converter (11 channels), 2-channel DMA, and ultra-low-power operation (63 μA/MHz) with HALT/STOP/SNOOZE modes - enabling battery-powered sensor nodes and motor-control interfaces in factory automation systems.

For engineers reviewing the R5F10277GNA#25 datasheet, R5F10277GNA#25 pinout, R5F10277GNA#25 application, or R5F10277GNA#25 equivalent, key selection criteria include its G-grade industrial temperature rating, on-chip data flash for field firmware updates, dual CSI/I²C serial interfaces, and hardware CRC for safety-critical data integrity - all within a compact 4 × 4 mm HWQFN package.

Technical Context

The R5F10277GNA#25 implements the RL78 CPU core with 3-stage pipeline CISC architecture, supporting instruction execution times from 0.04167 µs (@24 MHz high-speed on-chip oscillator) to 1 µs (@1 MHz). Its clock system combines a ±1.0% accurate high-speed on-chip oscillator (1–24 MHz), low-speed 15 kHz on-chip oscillator, and external crystal support (1–20 MHz).

Peripheral integration includes TAU0 16-bit timer (4 channels), window watchdog timer, 12-bit interval timer, SAU0 serial array unit (2-channel CSI + 1-channel I²C), UART0, and programmable buzzer/clock output - all managed via vectored interrupts (16 internal sources) and key interrupt capability across 9 KR pins.

Key Specifications

Pinout & Package

Package: HWQFN-24 (4 × 4 mm, 0.5 mm pitch), exposed die pad (to be connected to VSS), RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F1027AGNA#25, the R5F10277GNA#25 trades flash capacity for lower cost and smaller footprint in resource-constrained designs; versus R5F10377GNA#25, it adds essential industrial features - data flash, hardware CRC, and tighter oscillator tolerance - without changing PCB layout.

Availability

R5F10277GNA#25 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, and PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for R5F10277GNA#25 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 ultra-low-power 16-bit MCUs optimized for cost-sensitive industrial and consumer applications requiring robust peripheral integration, data retention, and extended temperature operation - with R5F10277GNA#25 targeting G-grade industrial edge nodes.

FAQ

What is the maximum operating frequency of the R5F10277GNA#25?

The R5F10277GNA#25 supports a maximum system clock frequency of 24 MHz using its high-speed on-chip oscillator. When using an external crystal (X1), the maximum main system clock is 20 MHz. Instruction execution time reaches 0.04167 µs at 24 MHz, delivering 31 DMIPS of processing performance - sufficient for real-time motor control loops and sensor fusion algorithms.

Does the R5F10277GNA#25 include on-chip debug functionality?

Yes, the R5F10277GNA#25 includes full on-chip debug functionality compatible with Renesas E2 emulator and CS+ IDE. Debug access uses the TOOLRxD/TOOLTxD pins (P11/P12) and supports breakpoints, watchpoints, and flash programming. Note that debug usage impacts flash endurance; Renesas recommends disabling debug features in final production firmware to ensure long-term reliability.

How does the data flash memory in the R5F10277GNA#25 differ from standard code flash?

The R5F10277GNA#25 includes 2 KB of dedicated data flash memory separate from its 4 KB code flash. Data flash supports background operation (BGO), allowing program execution while rewriting - critical for logging sensor data or storing calibration parameters. It guarantees 1,000,000 write/erase cycles at 1.8–5.5 V, unlike code flash which is optimized for firmware storage and lacks BGO capability.

Can the R5F10277GNA#25 operate at 1.8 V supply voltage?

Yes, the R5F10277GNA#25 operates across a full 1.8 V to 5.5 V supply range. At 1.8 V, it supports low-speed main (LS) mode up to 8 MHz and maintains full peripheral functionality including A/D conversion (with internal 1.45 V reference), UART, and I²C. This enables direct integration with 1.8 V logic families and extends battery life in energy-harvesting applications.

What safety-related hardware features does the R5F10277GNA#25 provide?

The R5F10277GNA#25 includes hardware CRC calculation, RAM guard, and SFR guard - all confirmed in the RL78/G12 datasheet for R5F102-series devices. These features detect memory corruption, prevent accidental register overwrites, and validate firmware integrity - supporting IEC 61508 SIL-2 and ISO 13849 PLd design requirements without external components.