Renesas R5F51101AGNF#20

Overview

R5F51101AGNF#20 from Renesas is a 32-bit RX CPU-based microcontroller operating at up to 32 MHz (50 DMIPS), featuring 32 KB on-chip flash, 10 KB SRAM, 12-bit A/D converter with 8 input channels, RTC, and dual SCI interfaces - deployed in low-power industrial sensor nodes and battery-powered control modules.

For engineers reviewing the R5F51101AGNF#20 datasheet, R5F51101AGNF#20 pinout, R5F51101AGNF#20 application, or R5F51101AGNF#20 equivalent, key selection criteria include its HWQFN-40 package (6 × 6 mm, 0.5 mm pitch), −40 to +105°C extended temperature grade, 1.8–3.6 V single-supply operation, software standby mode (0.35 μA), and integrated IEC 60730 safety support functions.

Technical Context

The R5F51101AGNF#20 implements a CISC Harvard architecture with five-stage pipeline and variable-length instructions, enabling ultra-compact code and single-cycle instruction execution. Its RX CPU core includes a 64-bit accumulator for 32×32-bit operations and dedicated hardware multiplier/divider.

On-chip peripherals are clocked independently: ICLK (system, up to 32 MHz), PCLK (peripherals, up to 32 MHz), and FCLK (FlashIF, up to 32 MHz). Clock sources include high-speed on-chip oscillator (32 MHz ±1%), sub-clock (32.768 kHz), and external crystal (up to 20 MHz), all managed via the clock generation circuit with CAC accuracy measurement.

Key Specifications

Pinout & Package

PWQN0040KC-A is a 40-pin HWQFN package (6 × 6 mm, 0.5 mm pitch) with an exposed die pad recommended for connection to VSS for thermal and electrical stability. Pin functions are multiplexed via the Multi-function Pin Controller (MPC).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit MCU applications.

Compared with R5F51101ADNF#U0, the R5F51101AGNF#20 provides extended temperature operation and IEC 60730 compliance features; compared with R5F51103AGNF#U0, it trades flash capacity for lower unit cost while retaining identical peripheral set and low-power behavior.

Availability

R5F51101AGNF#20 is available at Aetrix Electronics and suitable for smart thermostat control, industrial temperature sensor nodes, appliance motor drive interfaces, and energy meter communication hubs requiring stable component supply across automotive-qualified temperature ranges and long-lifecycle production programs.

Supply support for R5F51101AGNF#20 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 manufacturer specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The RX110 Group, including the R5F51101AGNF#20, is designed for cost-sensitive, low-power embedded applications demanding robust real-time performance, functional safety support, and compact packaging - especially in white goods, building automation, and sensor edge devices.

FAQ

What is the maximum operating frequency and CPU performance of the R5F51101AGNF#20?

The R5F51101AGNF#20 operates at a maximum frequency of 32 MHz and delivers 50 DMIPS of processing performance. Its RX CPU core features a five-stage pipeline, variable-length instruction encoding, and single-cycle execution for most basic instructions - enabling deterministic real-time response in control loops and sensor fusion algorithms. The R5F51101AGNF#20 achieves this without wait states on flash or SRAM access.

Which package type and footprint does the R5F51101AGNF#20 use?

The R5F51101AGNF#20 uses the PWQN0040KC-A package: a 40-pin HWQFN with 6 × 6 mm body size, 0.5 mm pin pitch, and an exposed thermal pad. This compact, lead-free package supports high-density PCB layouts and requires connection of the exposed pad to VSS for optimal thermal dissipation and noise immunity. The R5F51101AGNF#20 is not pin-compatible with 48- or 64-pin variants of the RX110 family.

Does the R5F51101AGNF#20 support IEC 60730 functional safety compliance?

Yes, the R5F51101AGNF#20 integrates hardware features required for Class B IEC 60730 compliance, including a clock frequency accuracy measurement circuit (CAC), independent watchdog timer (IWDT) with dedicated 15 kHz oscillator, RAM test assist functions, and voltage detection circuits. These capabilities reduce software overhead and certification effort for household appliance and industrial control applications. The R5F51101AGNF#20 itself is not certified, but provides the foundational hardware for compliant system design.

How many A/D converter channels does the R5F51101AGNF#20 support, and what is its resolution?

The R5F51101AGNF#20 integrates a 12-bit successive approximation A/D converter (S12AD) with 8 usable input channels (AN000–AN004, AN006, AN008–AN010) in the 40-pin HWQFN package. It achieves a minimum conversion time of 1.0 μs when ADCLK runs at 32 MHz and supports scan modes, double-trigger duplication for motor control, and external trigger initiation via ADTRG0#. The R5F51101AGNF#20 does not support the full 14-channel configuration available in larger-package RX110 variants.

What communication interfaces are available on the R5F51101AGNF#20?

The R5F51101AGNF#20 provides two SCI channels (SCI1 and SCI12), one I²C bus interface (RIIC), and one serial peripheral interface (RSPI). SCI1 supports asynchronous, clock-synchronous, simple I²C, and simple SPI modes; SCI12 adds extended serial mode (RXDX12/TXDX12/SIOX12). RSPI supports master/slave operation up to 16 Mbps with configurable bit length (8–32 bits) and double-buffered TX/RX. No CAN or USB interfaces are present on the R5F51101AGNF#20.