Renesas R5F1027AANA#25

Overview

R5F1027AANA#25 from Renesas Electronics is a 24-pin HWQFN-packaged 16-bit RL78/G12 microcontroller designed for ultra-low-power embedded control in consumer-grade applications (–40°C to +85°C). It integrates 16 KB code flash, 2 KB data flash, 1.5 KB RAM, a 24 MHz high-accuracy on-chip oscillator (±1.0% over –20°C to +85°C), and an 11-channel 10-bit A/D converter - enabling compact sensor interface and battery-powered IoT endpoint designs.

For engineers reviewing the R5F1027AANA#25 datasheet, R5F1027AANA#25 pinout, R5F1027AANA#25 application, or R5F1027AANA#25 equivalent, key selection considerations include its 2-channel DMA support, CRC hardware acceleration, safety features (RAM/SFR guard), 24-pin HWQFN thermal performance, and verified compatibility with Renesas' Flash Self Programming and Data Flash Libraries.

Technical Context

The R5F1027AANA#25 implements the RL78 CPU core with a 3-stage pipeline CISC architecture, supporting minimum instruction execution at 0.04167 µs (24 MHz on-chip oscillator) and full 1 MB address space. Its peripheral set includes two CSI channels (SPI-compatible), two simplified I²C channels, one UART, four 16-bit TAU timer channels, and a window watchdog timer - all operating under single-supply 1.8–5.5 V.

Power management is centered on HALT, STOP, and SNOOZE modes achieving 63 µA/MHz active current; the device uses dual on-chip oscillators (15 kHz low-speed and 1–24 MHz high-speed) and supports background operation during data flash rewriting (BGO). The 24-pin HWQFN package (4 × 4 mm, 0.5 mm pitch) exposes 22 I/O pins including six N-ch open-drain ports with 6 V tolerance.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F1027ADNA#25, the R5F1027AANA#25 offers identical functionality at lower temperature qualification cost; versus R5F1037AANA#25, it adds critical reliability features (data flash, CRC, guards) essential for field-deployed devices requiring firmware resilience and parameter retention.

Availability

R5F1027AANA#25 is available at Aetrix Electronics and suitable for smart home sensor nodes, industrial HMI panels, portable medical devices, and energy monitoring modules requiring stable component supply across production lifecycles.

Supply support for R5F1027AANA#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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power management ICs for automotive, industrial, and IoT markets.

The RL78/G12 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, battery-operated, and safety-aware embedded systems - emphasizing energy efficiency, integrated peripherals, and functional safety readiness.

FAQ

What is the maximum operating frequency of the R5F1027AANA#25?

The R5F1027AANA#25 supports a maximum system clock frequency of 24 MHz using its high-accuracy on-chip oscillator. This is confirmed in the datasheet's "High-speed on-chip oscillator" specification (±1.0% accuracy from –20°C to +85°C). External crystal operation is limited to 20 MHz per electrical specifications. The R5F1027AANA#25 achieves 31 DMIPS at 24 MHz, making it suitable for real-time sensor processing without external clock components.

Does the R5F1027AANA#25 include data flash memory?

Yes, the R5F1027AANA#25 includes 2 KB of dedicated data flash memory, explicitly confirmed in Section 1.3.1 of the datasheet and Table 1-1. This memory supports background operation (BGO), 1,000,000 rewrite cycles, and voltage operation from 1.8 V to 5.5 V - enabling reliable parameter storage, calibration data logging, and firmware update staging without external EEPROM. The R5F1027AANA#25 data flash is not present in R5F103x variants.

What safety features are implemented in the R5F1027AANA#25?

The R5F1027AANA#25 integrates hardware-based safety features including a CRC calculation unit, RAM guard, and SFR guard - all documented in Section 1.3.3 of the datasheet. These features allow runtime integrity checking of memory and registers without software overhead, supporting functional safety requirements for IEC 61508 SIL2 applications. The R5F1027AANA#25 does not include lockstep cores or ECC RAM, but its guard mechanisms provide deterministic fault detection for critical firmware sections.

Which package type does the R5F1027AANA#25 use?

The R5F1027AANA#25 uses a 24-pin plastic HWQFN package (4 × 4 mm, 0.5 mm pitch) with an exposed die pad, identified in Table 1-1 as "PWQN0024KE-A" or "PWQN0024KF-A". The datasheet specifies that the exposed pad must be connected to VSS for thermal and electrical stability. This package provides superior thermal dissipation and board-space efficiency compared to LSSOP/TSSOP alternatives, especially in compact consumer electronics designs.

Can the R5F1027AANA#25 operate from a 1.8 V supply?

Yes, the R5F1027AANA#25 is fully specified to operate from 1.8 V to 5.5 V, as stated in the "Outline" section and confirmed in Section 2.1 Absolute Maximum Ratings. At 1.8 V, it supports up to 8 MHz system clock (LS mode) and retains full functionality including A/D conversion (with internal 1.45 V reference), data flash writes, and low-power modes. This enables direct integration with single-cell Li-ion or alkaline battery systems without voltage regulation overhead.