Renesas R4F20115DFA#U0

Overview

R4F20115DFA#U0 from Renesas Electronics is a 16-bit single-chip microcontroller in the H8S/Tiny family, designed for embedded control applications requiring integrated peripherals, low power consumption, and deterministic real-time operation. It features 128 KB on-chip flash memory, 8 KB RAM, a 24 MHz max CPU clock, 57 I/O pins, and integrated modules including UART, SCI, I²C, PWM timers, and watchdog timer.

For engineers reviewing the R4F20115DFA#U0 datasheet, R4F20115DFA#U0 pinout, R4F20115DFA#U0 application, or R4F20115DFA#U0 equivalent, key selection considerations include its H8S/20115 group compatibility, 100-pin LQFP package, industrial-grade temperature range (–40°C to +85°C), and support for in-circuit debugging via on-chip debug interface.

Technical Context

The R4F20115DFA#U0 implements the H8S/2000 CPU core with 16-bit data bus and 24-bit address space, supporting advanced mode operation with 32-bit register extensions. It integrates a Clock Pulse Generator (CPG) with PLL, Low-Voltage Detection (LVD), and multiple power-down modes including HALT and STOP.

Peripheral integration includes three serial communication interfaces (SCI0–SCI2), one I²C bus interface (IIC2), six 16-bit timer channels (with compare match and input capture), and a 10-bit ADC with 8 input channels - all mapped into a unified memory-mapped I/O space with fixed vector interrupt handling.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level (MSL) 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with R4F20115DFA#U0, R4F20215DFA#U0 offers expanded memory and peripherals within the same pinout and software ecosystem, while R5F21215SDFP#V0 represents a generational shift toward lower power and enhanced flash reliability - both require board-level validation due to non-pin-compatible packaging and register-level differences.

Availability

R4F20115DFA#U0 is available at Aetrix Electronics and suitable for industrial motor control, building automation sensor hubs, factory floor PLC I/O modules, and medical diagnostic equipment interfaces requiring stable component supply across extended product lifecycles.

Supply support for R4F20115DFA#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 specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The H8S/Tiny series - including R4F20115DFA#U0 - was engineered for cost-sensitive, high-reliability embedded control applications where deterministic real-time performance, integrated peripherals, and long-term supply stability are critical.

FAQ

What is the maximum operating frequency of the R4F20115DFA#U0?

The R4F20115DFA#U0 operates at a maximum system clock frequency of 24 MHz, achieved using an internal PLL with external crystal (1–20 MHz) or external clock source. This yields a 41.7 ns instruction cycle time in advanced mode, enabling hard real-time response for motor control and industrial I/O tasks. The R4F20115DFA#U0's CPG module supports dynamic clock switching between main and sub-clocks for power optimization.

Does the R4F20115DFA#U0 support in-circuit debugging?

Yes, the R4F20115DFA#U0 includes a dedicated on-chip debug interface compliant with Renesas' standard debug protocol, allowing full real-time debugging - including breakpoints, watchpoints, register inspection, and flash programming - without external JTAG emulators. This capability is enabled by default in single-chip mode and requires no additional hardware beyond a debug adapter. The R4F20115DFA#U0 debug interface supports both background and foreground debugging modes.

What are the power supply requirements for the R4F20115DFA#U0?

The R4F20115DFA#U0 requires a single 5 V ±10% supply for VCC and VSS pins, with separate analog and digital ground connections recommended for noise-sensitive ADC operation. Total supply current ranges from 25 mA (active at 24 MHz) to less than 10 µA in STOP mode. The R4F20115DFA#U0 incorporates internal voltage regulation and LVD circuitry to maintain reliable operation across voltage transients and brownout conditions.

How many serial communication interfaces does the R4F20115DFA#U0 integrate?

The R4F20115DFA#U0 integrates three full-duplex asynchronous serial interfaces (SCI0–SCI2), each supporting UART functionality with programmable baud rates, parity, stop bits, and framing error detection. SCI0 and SCI1 also support synchronous operation and LIN bus physical layer compatibility. These interfaces are memory-mapped and interrupt-capable, enabling concurrent multi-protocol communication - essential for the R4F20115DFA#U0's use in industrial gateways and sensor concentrators.

Is the R4F20115DFA#U0 qualified for industrial temperature operation?

Yes, the R4F20115DFA#U0 is rated for industrial temperature operation from –40°C to +85°C ambient, meeting Renesas' "Standard" quality grade classification for use in computers, office equipment, industrial robots, and factory automation systems. Its thermal design and process technology ensure stable timing, flash retention, and I/O drive strength across this full range. The R4F20115DFA#U0's LVD and watchdog features further enhance reliability under thermal stress conditions.