Renesas R5F10277ANA#W5

Overview

R5F10277ANA#W5 from Renesas is a 24-pin HWQFN-packaged RL78/G12 16-bit microcontroller with 4 KB code flash, 2 KB data flash, 512 B RAM, and ultra-low-power operation (63 μA/MHz). It integrates a 10-bit 11-channel ADC, dual CSI/I²C serial interfaces, UART, 4-channel 16-bit TAU timer, DMA controller, and operates from 1.8 V to 5.5 V across –40°C to +85°C for consumer-grade embedded control in battery-powered sensors and smart peripherals.

For engineers reviewing the R5F10277ANA#W5 datasheet, R5F10277ANA#W5 pinout, R5F10277ANA#W5 application, or R5F10277ANA#W5 equivalent, key selection criteria include its 24-pin HWQFN footprint, integrated 2 KB data flash for field firmware updates, 2-channel DMA for sensor data offload, and support for both high-speed on-chip oscillator (±1.0% accuracy) and external crystal clocking.

Technical Context

The R5F10277ANA#W5 implements the RL78 CPU core with 3-stage pipeline CISC architecture, 1 MB address space, and configurable instruction timing (0.04167 μs min @ 24 MHz). Its peripheral set includes SAU0 with two CSI/I²C channels and one UART channel, plus TAU0 with four 16-bit timer channels supporting PWM and input capture.

Power management features include HALT, STOP, and SNOOZE modes, on-chip POR/LVD with 12-level voltage detection, and dedicated low-speed 15 kHz watchdog timer. The device supports self-programming of code flash and background operation (BGO) for data flash writes while executing from program memory.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F10277ANA#W5, R5F10278ANA#W5 offers double code flash capacity for future firmware expansion, while R5F10377ANA#W5 removes data flash and safety peripherals to reduce unit cost-making it viable only where those features are unused.

Availability

R5F10277ANA#W5 is available at Aetrix Electronics and suitable for smart sensor nodes, industrial HMIs, portable medical monitors, and energy meter subsystems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for R5F10277ANA#W5 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 delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT markets.

The RL78/G12 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, battery-operated general-purpose control applications requiring integrated analog, communication, and safety features.

FAQ

What is the maximum operating frequency of the R5F10277ANA#W5?

The R5F10277ANA#W5 supports up to 24 MHz operation using its high-speed on-chip oscillator or 20 MHz via external crystal (X1). At 24 MHz, minimum instruction execution time is 0.04167 μs. System clock selection is configurable through the clock generator registers, and the device maintains full functionality across its 1.8–5.5 V supply range at these frequencies. The R5F10277ANA#W5 achieves 31 DMIPS at 24 MHz.

Does the R5F10277ANA#W5 include an integrated temperature sensor?

Yes, the R5F10277ANA#W5 includes an on-chip temperature sensor accessible via the 10-bit ADC. It is listed among the analog input channels (ANI0–ANI3, ANI16–ANI22) and shares the same reference voltage (1.45 V typical) used by other ADC inputs. This sensor enables ambient temperature monitoring without external components, and its output is calibrated for use in thermal compensation algorithms within the R5F10277ANA#W5 firmware.

Can the R5F10277ANA#W5 operate from a 1.8 V supply?

Yes, the R5F10277ANA#W5 is fully specified to operate from 1.8 V to 5.5 V. At 1.8 V, it supports LS (low-speed main) mode with up to 8 MHz system clock, enabling ultra-low-power operation in energy-constrained applications. All peripherals-including ADC, timers, and serial interfaces-remain functional within this voltage range, and the on-chip voltage detector provides programmable reset thresholds down to 1.88 V.

How many serial communication interfaces does the R5F10277ANA#W5 support?

The R5F10277ANA#W5 supports three serial interfaces: one UART channel (UART0), and two simplified SPI/I²C channels (CSI00 and CSI01, each configurable as either CSI or I²C). These are implemented via the SAU0 peripheral. P60/P61 serve as dedicated SCLA0/SDAA0 pins with 6 V tolerance, while P41/P42 and P11/P12 provide secondary I²C/CSI capability. No native CAN or USB interface is present in the R5F10277ANA#W5.

Is the R5F10277ANA#W5 pin-compatible with other RL78/G12 24-pin variants?

Yes, all RL78/G12 24-pin HWQFN devices-including R5F1027x and R5F1037x variants-share identical pinout and package (PWQN0024KE-A/PWQN0024KF-A). The R5F10277ANA#W5 is pin-compatible with R5F10278ANA#W5, R5F10279ANA#W5, and R5F10377ANA#W5. Functional differences (e.g., data flash presence, DMA, oscillator accuracy) are implemented internally and do not affect PCB layout or mechanical fit.