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Home > Products > Integrated Circuits (ICs) > Embedded > Microcontrollers

Renesas R5F21103DFP#U0

Name: R5F21103DFP#U0
Brand: Renesas
SKU: R5F21103DFP#U0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: R5F21103DFP#U0

Manufacturer:: Renesas

Category:: Microcontrollers

Package:: 32-LQFP

Datasheet:: R5F21103DFP#U0.pdf

Description:: IC MCU 16BIT 12KB FLASH 32LQFP

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Product details

Overview

R5F21103DFP#U0 from Renesas Electronics is a 16-bit Flash microcontroller in the R8C/10 Group, built on the R8C/Tiny Series CPU core and packaged in a 32-pin LQFP (PLQP0032GB-A). It features 12 KB Flash ROM, 768 bytes RAM, operates from −40°C to +85°C, and integrates an 8-channel 10-bit A/D converter, three 8-bit timers, one 16-bit timer, UART and clock-synchronous serial interfaces, and LED drive capability on P10–P17 - used in sensor-based housing equipment and industrial control panels.

For engineers reviewing the R5F21103DFP#U0 datasheet, R5F21103DFP#U0 pinout, R5F21103DFP#U0 application, or R5F21103DFP#U0 equivalent, key selection criteria include its −40°C to +85°C industrial temperature grade, 12 KB Flash with 100-cycle endurance, dual UART support, and integrated analog-to-digital conversion for embedded sensing and actuation systems.

Technical Context

This MCU implements the R8C/Tiny CPU core with 89 basic instructions and executes at 62.5 ns minimum instruction time (16 MHz XIN, VCC = 3.0–5.5 V). Its memory map spans 1 Mbyte, with fixed interrupt vectors at 0FFDC₁₆–0FFFF₁₆, Flash ROM starting at 0C000₁₆, and RAM beginning at 00400₁₆.

The peripheral set includes two independent UART channels (one with clock-synchronous mode), a 10-bit A/D converter with internal reference voltage input (VREF), watchdog timer with prescaler, oscillation stop detection, and four external interrupt inputs (INT0–INT3) plus key-input interrupts (KI0–KI3) - all managed via dedicated SFRs mapped in the 00000₁₆–002FF₁₆ address range.

Key Specifications

Parameter	Value and Actual Design Meaning
CPU Core	R8C/Tiny 16-bit core with 89 instructions; enables compact code size and deterministic real-time response in resource-constrained systems.
Flash ROM / RAM	12 KB Flash (100 program/erase cycles), 768 bytes RAM; supports field firmware updates and local data buffering without external memory.
Operating Temp	−40°C to +85°C (D-version); qualified for industrial environments including HVAC controls and factory automation nodes.
A/D Converter	10-bit resolution, 8 input channels (AN0–AN7); provides sufficient dynamic range for temperature, pressure, and light sensing in appliance interfaces.
Timers	Three 8-bit timers (X/Y/Z) + one 16-bit timer C with input capture; enables PWM generation, pulse counting, and precise timing for motor control or signal measurement.
Serial Interfaces	UART0 (full-duplex) + UART1 (clock-synchronous or UART mode); supports host communication and daisy-chained sensor networks without external level shifters.
Supply Voltage	2.7–5.5 V operation; allows direct interface with 3.3 V or 5 V logic domains and compatibility with legacy industrial power rails.

Pinout & Package

Package: 32-pin plastic LQFP (PLQP0032GB-A, also designated 32P6U-A), 7 mm × 7 mm body, 0.8 mm pitch, exposed pad not present.

Pin/Terminal	Circuit Role	Design Meaning
XIN / P46	Main clock input	Accepts ceramic resonator (1–20 MHz) or external clock; required for full-speed operation and system timing stability.
XOUT / P47	Main clock output	Drives crystal/resonator feedback path; must be left open if using external clock source on XIN.
RESET	Active-low reset input	Asynchronous hardware reset; pulled low via RC network or pushbutton to initialize CPU and peripherals.
VCC / VSS	Digital power supply	Primary 2.7–5.5 V supply and ground; decoupled with 0.1 µF capacitor near package for noise immunity.
AVCC / AVSS	Analog power supply	Dedicated 2.7–5.5 V analog domain; must be connected to VCC/VSS with separate 0.1 µF capacitor to minimize A/D noise.
P00–P07	8-bit I/O port with analog inputs	AN0–AN7 multiplexed on P00–P07; enables simultaneous digital I/O and analog acquisition without external muxing.
P10–P17	LED drive I/O port	Capable of sinking up to 20 mA per pin; directly drives common-anode LEDs in status panels or user interfaces.
RxD0 / TxD0	UART0 serial interface	Full-duplex asynchronous communication channel; supports standard baud rates up to 115.2 kbps at 16 MHz.
RxD1 / TxD10 / TxD11	UART1 serial interface	Configurable as UART or clock-synchronous serial; TxD11 doubles as analog input AN7 for flexible pin reuse.
INT0–INT3	External interrupt inputs	Edge-triggered inputs supporting wake-up from Wait/Stop modes; used for emergency stop, button press, or sensor event detection.

Key Features

Feature	Design Value
On-chip oscillator	Integrated RC oscillator eliminates need for external crystal in cost-sensitive applications where ±1% timing accuracy suffices.
Watchdog timer	15-bit counter with programmable prescaler ensures reliable system recovery from software lockup in unattended devices.
Oscillation stop detection	Monitors main clock failure and triggers automatic switch to on-chip oscillator, maintaining basic functionality during crystal fault.
Low-power modes	Wait mode (35 µA) and Stop mode (0.7 µA) at 3.0 V enable battery-powered operation for >1 year in sensor nodes.
Interrupt priority levels	7-level nested priority supports mixed-criticality tasks - e.g., safety shutdown (high priority) vs. display refresh (low priority).

Applications

Smart Thermostat Interface	Industrial Panel Controller
Use Scenario: Embedded controller in wall-mounted HVAC thermostats acquiring temperature/humidity via analog sensors and driving LED indicators. IC Role / Device Role / Timing Role: Central MCU executing PID loop, managing dual UART for Zigbee/Wi-Fi module communication, and scanning keypad inputs. Use Value: Integrated 10-bit A/D and LED drive ports reduce BOM count by eliminating external ADC and driver ICs.	Use Scenario: Local control unit in factory machine HMI panels monitoring limit switches, controlling solenoids, and displaying status via 7-segment LEDs. IC Role / Device Role / Timing Role: Real-time I/O coordinator with deterministic interrupt latency for emergency stop handling and cycle timing. Use Value: −40°C to +85°C rating and robust ESD tolerance ensure reliability in dusty, vibration-prone industrial enclosures.
Home Security Sensor Hub	Appliance Motor Control Module
Use Scenario: Battery-powered door/window sensor node aggregating reed switch and PIR inputs, then transmitting alerts via UART to gateway. IC Role / Device Role / Timing Role: Ultra-low-power sensor aggregator using Stop mode between events and Wake-on-INT to minimize energy use. Use Value: 0.7 µA Stop current and integrated watchdog enable multi-year battery life without maintenance.	Use Scenario: Brushless DC motor commutation controller in washing machine drum drive, reading hall-effect sensors and generating PWM. IC Role / Device Role / Timing Role: Precision timing engine using Timer C input capture for rotor position and Timer Y for PWM generation. Use Value: Three independent 8-bit timers plus 16-bit Timer C allow concurrent motor control, UI update, and fault monitoring without software overhead.

Smart Thermostat Interface

Industrial Panel Controller

Use Scenario: Embedded controller in wall-mounted HVAC thermostats acquiring temperature/humidity via analog sensors and driving LED indicators.

IC Role / Device Role / Timing Role: Central MCU executing PID loop, managing dual UART for Zigbee/Wi-Fi module communication, and scanning keypad inputs.

Use Value: Integrated 10-bit A/D and LED drive ports reduce BOM count by eliminating external ADC and driver ICs.

Use Scenario: Local control unit in factory machine HMI panels monitoring limit switches, controlling solenoids, and displaying status via 7-segment LEDs.

IC Role / Device Role / Timing Role: Real-time I/O coordinator with deterministic interrupt latency for emergency stop handling and cycle timing.

Use Value: −40°C to +85°C rating and robust ESD tolerance ensure reliability in dusty, vibration-prone industrial enclosures.

Home Security Sensor Hub

Appliance Motor Control Module

Use Scenario: Battery-powered door/window sensor node aggregating reed switch and PIR inputs, then transmitting alerts via UART to gateway.

IC Role / Device Role / Timing Role: Ultra-low-power sensor aggregator using Stop mode between events and Wake-on-INT to minimize energy use.

Use Value: 0.7 µA Stop current and integrated watchdog enable multi-year battery life without maintenance.

Use Scenario: Brushless DC motor commutation controller in washing machine drum drive, reading hall-effect sensors and generating PWM.

IC Role / Device Role / Timing Role: Precision timing engine using Timer C input capture for rotor position and Timer Y for PWM generation.

Use Value: Three independent 8-bit timers plus 16-bit Timer C allow concurrent motor control, UI update, and fault monitoring without software overhead.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
R5F21103FP	Same core, Flash, RAM, and peripherals but rated for −20°C to +85°C only; no D-grade qualification.	Suitable for indoor consumer appliances but not outdoor or unheated industrial spaces.	Select R5F21103FP only when ambient operating temperature remains above −20°C and cost is primary constraint.
R5F21104DFP	16 KB Flash (vs. 12 KB), same RAM, identical package and temperature grade; otherwise functionally compatible.	Preferred when larger firmware image size is needed for enhanced feature sets or future OTA updates.	Choose R5F21104DFP if firmware growth is anticipated and additional 4 KB Flash justifies minor cost increase.

Compared with R5F21103DFP#U0, R5F21103FP lacks extended temperature support and R5F21104DFP adds 4 KB Flash - both share identical pinout, peripheral set, and instruction set, enabling drop-in replacement in most designs with appropriate firmware validation.

Availability

R5F21103DFP#U0 is available at Aetrix Electronics and suitable for industrial control panels, smart home sensor hubs, and appliance motor interface modules requiring stable component supply across long production lifecycles.

Supply support for R5F21103DFP#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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power solutions.

The R8C/10 Group targets cost-sensitive, low-power embedded applications in industrial equipment, home appliances, and sensor interfaces - emphasizing integration, reliability, and ease of migration within the R8C family.

FAQ

What is the maximum operating frequency supported by the R5F21103DFP#U0?

The R5F21103DFP#U0 supports a maximum main clock frequency of 16 MHz when powered at VCC = 3.0–5.5 V, yielding a minimum instruction execution time of 62.5 ns. At lower supply voltages (2.7–5.5 V), the maximum clock is 10 MHz with 100 ns instruction time. The on-chip oscillator operates up to 1 MHz and does not require external components.

Does the R5F21103DFP#U0 include a hardware debug interface?

Yes, the R5F21103DFP#U0 supports on-chip debugging via dedicated pins (P00/AN7/TxD11 and P37/TxD10/RxD1), though these pins cannot be used for application I/O when the debugger is active. Debug functionality requires Renesas E8 or E1 emulator hardware and associated CS+ or HEW development tools.

Can the R5F21103DFP#U0 operate from a single 3.3 V supply?

Yes, the R5F21103DFP#U0 operates across VCC = 2.7–5.5 V, making it fully compatible with 3.3 V systems. At 3.0 V and 10 MHz, typical current consumption is 5 mA active, 35 µA in Wait mode, and 0.7 µA in Stop mode - enabling efficient use in mixed-voltage designs.

How many analog input channels does the R5F21103DFP#U0 support?

The R5F21103DFP#U0 integrates a single 10-bit A/D converter with eight analog input channels (AN0–AN7), multiplexed onto port P00–P07. The reference voltage (VREF) is selectable internally (AVCC) or externally applied, and conversion is triggered by software, timer, or external event.

Is the R5F21103DFP#U0 pin-compatible with other R8C/10 Group MCUs?

Yes, all R8C/10 Group devices in the PLQP0032GB-A (32-pin LQFP) package - including R5F21102DFP, R5F21103DFP#U0, and R5F21104DFP - share identical pin assignments and electrical characteristics. Firmware and PCB layouts are interchangeable across this subset, provided memory and peripheral usage align with the selected variant.

R5F21103DFP#U0 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Package/Case:: 32-LQFP

Series:: R8C/1x/10

Packaging:: Tray

Product Status:: Obsolete

Programmable:: Not Verified

Core Processor:: R8C

Core Size:: 16-Bit

Speed:: 16MHz

Connectivity:: SIO, UART/USART

Peripherals:: LED, WDT

Number of I/O:: 22

Program Memory Size:: 12KB (12K x 8)

Program Memory Type:: FLASH

EEPROM Size:: -

RAM Size:: 768 x 8

Voltage - Supply (Vcc/Vdd):: 2.7V ~ 5.5V

Data Converters:: A/D 8x10b

Oscillator Type:: Internal

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:

R5F21103DFP#U0 FAQ

1.How can I place an order for R5F21103DFP#U0 through Aetrix?

Please submit a Request for Quotation (RFQ) for R5F21103DFP#U0 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for R5F21103DFP#U0 reliable?

The price and inventory of R5F21103DFP#U0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21103DFP#U0 is usually 5 days.

3.What payment methods are accepted for R5F21103DFP#U0?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21103DFP#U0 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for R5F21103DFP#U0?

R5F21103DFP#U0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your R5F21103DFP#U0 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for R5F21103DFP#U0?

For technical support, including R5F21103DFP#U0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21103DFP#U0 requirements.

6.How does Aetrix verify that R5F21103DFP#U0 is sourced from the original manufacturer or authorized distributors?

All R5F21103DFP#U0 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that R5F21103DFP#U0 meets industry standards.

7.What is the process for return or replacement of R5F21103DFP#U0?

All R5F21103DFP#U0 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21103DFP#U0, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The R5F21103DFP#U0 part is unused and in its original packaging.

Return procedure for R5F21103DFP#U0:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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