Renesas R5F10277ANA#45

Overview

R5F10277ANA#45 from Renesas Electronics is a 24-pin HWQFN-packaged RL78/G12 16-bit microcontroller designed for ultra-low-power embedded control in consumer-grade applications (–40°C to +85°C). It integrates 4 KB code flash, 2 KB data flash, 256 B RAM, a 10-bit 11-channel ADC, and dual serial interfaces (2× CSI, 2× I²C, 1× UART) operating at up to 24 MHz with 31 DMIPS performance.

For engineers reviewing the R5F10277ANA#45 datasheet, R5F10277ANA#45 pinout, R5F10277ANA#45 application, or R5F10277ANA#45 equivalent, this device serves as a cost-optimized, low-voltage (1.8–5.5 V) MCU for battery-powered sensors, home appliance controls, and industrial HMI panels requiring integrated data flash, hardware CRC, and DMA support.

Technical Context

The R5F10277ANA#45 implements the RL78 CPU core with a 3-stage pipeline CISC architecture, supporting instruction execution times from 0.04167 µs (24 MHz on-chip oscillator) to 1 µs (1 MHz), and a 1 MB address space. Its peripheral set includes two DMA channels, hardware multiplier/divider/accumulator, and a 12-bit interval timer - all optimized for deterministic real-time response in resource-constrained systems.

It features dual on-chip oscillators: a high-accuracy ±1.0% (–20 to +85°C) high-speed oscillator (1–24 MHz) and a 15 kHz low-speed oscillator for STOP/HALT mode operation. The device supports background data flash rewriting (BGO), 1,000,000 write cycles, and operates across 1.8–5.5 V supply while delivering 63 µA/MHz active current consumption.

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 R5F10278ANA#45, R5F10277ANA#45 trades flash capacity for lower unit cost while retaining full safety and data retention features; versus R5F10377ANA#45, it adds essential reliability functions - making it the minimum viable choice for field-deployed devices requiring secure, long-term data logging.

Availability

R5F10277ANA#45 is available at Aetrix Electronics and suitable for smart home sensor nodes, industrial panel controllers, and white goods motor control systems requiring stable component supply, long-lifecycle assurance, and Renesas-qualified manufacturing traceability.

Supply support for R5F10277ANA#45 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 true low-power 16-bit MCUs targeting cost-sensitive, battery-operated, and safety-aware embedded applications - emphasizing energy efficiency, integrated peripherals, and functional safety readiness.

FAQ

What is the maximum operating frequency and corresponding DMIPS rating of the R5F10277ANA#45?

The R5F10277ANA#45 achieves a maximum system clock of 24 MHz using its high-speed on-chip oscillator, delivering 31 DMIPS performance. This is confirmed in the RL78/G12 datasheet (R01DS0193EJ0250 Rev.2.50, Page 1). The core executes instructions in as little as 0.04167 µs at this speed, enabling responsive real-time control in compact firmware footprints.

Does the R5F10277ANA#45 include data flash memory, and what is its endurance specification?

Yes, the R5F10277ANA#45 integrates 2 KB of on-chip data flash memory rated for 1,000,000 write/erase cycles (typical) across the full 1.8–5.5 V supply range. It supports background operation (BGO), allowing concurrent CPU execution and flash rewriting - a key capability documented in Section 1.1 of the R01DS0193EJ0250 datasheet.

What package type and pin count does the R5F10277ANA#45 use, and is the exposed pad internally connected?

The R5F10277ANA#45 uses a 24-pin HWQFN package (4 × 4 mm, 0.5 mm pitch) with an exposed die pad. Per datasheet Page 8, the exposed pad is not electrically connected internally and must be externally soldered to VSS for optimal thermal dissipation and noise immunity - a mandatory layout requirement.

Which serial communication interfaces are available on the R5F10277ANA#45, and how many channels does each support?

The R5F10277ANA#45 provides two CSI (SPI-compatible) channels, two simplified I²C channels, and one UART channel - all accessible on dedicated pins or remappable via the Peripheral I/O Redirection Register (PIOR). This configuration is fixed for R5F1027x 24-pin variants, as specified in Table 1-1 and Section 1.7 of the RL78/G12 datasheet.

What safety-related hardware features are implemented in the R5F10277ANA#45 that distinguish it from the R5F10377ANA#45?

The R5F10277ANA#45 includes hardware CRC calculation, RAM guard, and SFR guard - features absent in the R5F10377ANA#45. These protect against memory corruption and unauthorized register access, directly supporting IEC 61508 SIL-2 readiness. Their presence is confirmed in Section 1.3.3 and block diagrams (Pages 6 and 11–12) of the R01DS0193EJ0250 datasheet.