Renesas R5F1027ADNA#U0

Overview

R5F1027ADNA#U0 from Renesas Electronics is a 24-pin HWQFN-packaged 16-bit RL78/G12 microcontroller designed for industrial embedded control. It integrates 4 KB code flash, 2 KB data flash, 512 B RAM, 10-bit 11-channel ADC, dual CSI/I²C interfaces, UART, 4-channel 16-bit TAU timer, and operates from 1.8–5.5 V across –40°C to +85°C for industrial applications.

For engineers reviewing the R5F1027ADNA#U0 datasheet, R5F1027ADNA#U0 pinout, R5F1027ADNA#U0 application, or R5F1027ADNA#U0 equivalent, key selection criteria include its industrial-grade temperature range, on-chip data flash with 1M rewrite cycles, dual serial interface capability, low-power STOP/HALT modes, and hardware CRC for firmware integrity in safety-conscious designs.

Technical Context

The R5F1027ADNA#U0 implements the RL78 CPU core with 3-stage CISC pipeline, supporting instruction execution as fast as 0.04167 µs at 24 MHz (high-speed on-chip oscillator) or as slow as 1 µs at 1 MHz for ultra-low-power operation. Its memory architecture separates 4 KB code flash (1 KB block size) from dedicated 2 KB data flash enabling background operation (BGO) during program execution.

Peripheral integration includes two DMA channels for efficient memory-to-peripheral transfers, a 12-bit interval timer, window watchdog timer, and programmable clock/buzzer output controller. All serial interfaces-CSI00/CSI01, IIC00/IIC01, and UART0-are implemented via the SAU0 peripheral, with pin multiplexing managed through the Peripheral I/O Redirection Register (PIOR).

Key Specifications

Pinout & Package

Package: HWQFN-24 (4 mm × 4 mm, 0.5 mm pitch), exposed die pad (to be connected to VSS). Pin count: 24. Industrial-grade moisture sensitivity level (MSL) 3 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F1027AGNA#U0, the R5F1027ADNA#U0 trades extended temperature range for lower cost and same functionality at +85°C; compared with R5F1037ADNA#U0, it adds critical reliability features-data flash, CRC, and memory guards-at modest cost premium for industrial deployments.

Availability

R5F1027ADNA#U0 is available at Aetrix Electronics and suitable for industrial automation, smart metering, and battery-powered sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed industrial-grade qualification.

Supply support for R5F1027ADNA#U0 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 targets cost-sensitive, ultra-low-power industrial control applications-delivering robust peripheral integration, data retention, and functional safety features in compact packages like the R5F1027ADNA#U0.

FAQ

What is the maximum operating frequency of the R5F1027ADNA#U0 using its internal oscillator?

The R5F1027ADNA#U0 supports a high-speed on-chip oscillator up to 24 MHz with ±1.0% accuracy over –20°C to +85°C. This allows full-speed execution at 24 MHz without external crystals, reducing BOM cost and board space. The R5F1027ADNA#U0 achieves 31 DMIPS at this frequency, making it suitable for real-time control tasks in industrial settings.

Does the R5F1027ADNA#U0 support in-system programming of its data flash memory?

Yes, the R5F1027ADNA#U0 supports background operation (BGO) for data flash rewriting-enabling firmware or configuration updates while the main application continues running. Its 2 KB data flash is rated for 1,000,000 rewrite cycles at 1.8–5.5 V, and the R5F1027ADNA#U0 includes flash shield window and block erase prohibition for security-critical applications.

How many analog input channels does the R5F1027ADNA#U0 provide, and what is their resolution?

The R5F1027ADNA#U0 integrates an 11-channel, 10-bit successive approximation register (SAR) ADC with internal 1.45 V reference voltage and temperature sensor. Channels include ANI0–ANI3 and ANI16–ANI22, supporting simultaneous sampling in time-critical sensor monitoring applications. The R5F1027ADNA#U0's ADC operates across the full 1.8–5.5 V supply range.

What power-saving modes are available on the R5F1027ADNA#U0, and what are their typical current draws?

The R5F1027ADNA#U0 offers HALT (63 μA/MHz), STOP (0.52 μA typical), and SNOOZE modes. In STOP mode with RTC active, current draw remains below 1 μA-ideal for battery-backed applications. Wake-up sources include external interrupts (INTP0–INTP3), timer events, and serial interface activity, all configurable without CPU intervention.

Is the R5F1027ADNA#U0 pin-compatible with other RL78/G12 variants in the same 24-pin HWQFN package?

Yes, all RL78/G12 24-pin HWQFN devices-including R5F1027x and R5F1037x variants-share identical pinouts and mechanical footprint (PWQN0024KE-A/PWQN0024KF-A). However, peripheral availability differs: the R5F1027ADNA#U0 includes data flash, DMA, CRC, and dual serial interfaces not present in R5F1037x parts, requiring firmware validation but no PCB change.