Renesas R4F20103NFB#U0

Overview

R4F20103NFB#U0 from Renesas Electronics is a 16-bit single-chip microcontroller in the H8S/Tiny family, designed for embedded control in resource-constrained industrial and consumer systems. It integrates 64 KB on-chip flash memory, 4 KB RAM, a 16-bit CPU core, 16-channel 10-bit ADC, and supports up to 20 MHz operation with internal clock generation via PLL. It is commonly deployed in motor control interfaces and sensor-based appliance subsystems.

For engineers reviewing the R4F20103NFB#U0 datasheet, R4F20103NFB#U0 pinout, R4F20103NFB#U0 application, or R4F20103NFB#U0 equivalent, key selection criteria include its 64-pin LQFP package, 3.3 V supply compatibility, integrated watchdog timer (WDT), low-voltage detection (LVD), and support for asynchronous serial communication (SCI) and I²C interfaces.

Technical Context

The R4F20103NFB#U0 implements the H8S/2000 CPU architecture with 24-bit address space, supporting both advanced and standard operating modes. It features a programmable clock pulse generator (CPG) with PLL, enabling flexible system clock derivation from external crystals or internal oscillators.

Peripheral integration includes a 16-channel 10-bit ADC with sample-and-hold, four 16-bit timer/counters (including compare-match and interval timers), and dual serial interfaces-SCI3 (UART-compatible) and IIC2 (I²C bus)-all mapped to dedicated pins with configurable I/O drive strength and pull-up options.

Key Specifications

Pinout & Package

Package: 64-pin LQFP (10 mm × 10 mm, 0.5 mm pitch), thermally enhanced with exposed pad (EPAD) connected to VSS for improved heat dissipation and noise immunity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R4F20103NFB#U0, R4F20115NFB#U0 adds CAN but increases pin count and cost, while R5F565NEEDFP delivers substantial compute headroom and security at the expense of legacy code compatibility and footprint size-making R4F20103NFB#U0 optimal for cost-sensitive, fixed-function embedded control where CAN and Ethernet are unnecessary.

Availability

R4F20103NFB#U0 is available at Aetrix Electronics and suitable for industrial motor control, home appliance subsystems, and sensor interface modules requiring stable component supply across long production lifecycles.

Supply support for R4F20103NFB#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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power management ICs for industrial, automotive, and infrastructure markets.

The H8S/Tiny series-including R4F20103NFB#U0-is engineered for deterministic real-time control in cost-sensitive embedded systems, emphasizing low power, high noise immunity, and minimal external component count.

FAQ

What is the maximum operating frequency of the R4F20103NFB#U0?

The R4F20103NFB#U0 supports a maximum system clock frequency of 20 MHz, achievable via its on-chip PLL when driven by an external 1–20 MHz crystal or clock source. Internal RC oscillators provide fallback timing at 128 kHz for low-power modes. All peripherals-including ADC, timers, and serial interfaces-are fully functional at this rate, with zero-wait-state access to on-chip RAM and flash.

Does the R4F20103NFB#U0 include a hardware watchdog timer?

Yes, the R4F20103NFB#U0 integrates a dedicated watchdog timer (WDT) with an independent 128 kHz internal RC oscillator. Its 15-bit counter offers programmable timeout periods ranging from 16 ms to 2 s. The WDT can generate either a non-maskable interrupt or a system reset upon timeout, and it supports windowed operation to prevent premature refresh-critical for safety-aware applications like R4F20103NFB#U0-based appliance controllers.

Can the R4F20103NFB#U0 operate from a 3.3 V supply only?

Yes, the R4F20103NFB#U0 is specified for single-supply operation at 3.3 V ±0.3 V across the full industrial temperature range (−40°C to +85°C). It does not support 5 V operation or mixed-voltage I/O. All digital I/O pins are 3.3 V tolerant with internal pull-ups, and the ADC reference can be configured to use either AVCC or an internal 2.5 V bandgap source-ensuring accurate measurements without external regulators for R4F20103NFB#U0 designs.

How many ADC channels does the R4F20103NFB#U0 support, and what is their resolution?

The R4F20103NFB#U0 features a 16-channel, 10-bit successive-approximation ADC with built-in sample-and-hold. Conversion time is 1.2 μs per channel, and inputs are shared with Port A pins (PA0–PA15). The ADC supports software/start-triggered conversions, scan mode for sequential channel acquisition, and optional automatic averaging across up to 4 samples-making it well-suited for real-time monitoring tasks in R4F20103NFB#U0-based sensor nodes.

Is there on-chip debug support for the R4F20103NFB#U0?

Yes, the R4F20103NFB#U0 provides full on-chip debug capability via the single-pin FINE (Fast In-Circuit Emulation) interface. This allows non-intrusive real-time debugging, flash programming, and breakpoint setting without requiring dedicated debug pins or external JTAG adapters. The FINE interface is compatible with Renesas E2 emulator hardware and CS+ IDE, enabling rapid development and validation of firmware for R4F20103NFB#U0 applications.