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Renesas R5F21257SDFP#X6
- Part No.:
- R5F21257SDFP#X6
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 52-LQFP
- Datasheet:
-
R5F21257SDFP#X6.pdf
- Description:
- 16BIT MCU R8C/25 ROM48K/RAM2.5K
- Quantity:
- Payment:
- Shipping:
Inventory:3,104
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Product details
Overview
R5F21257SDFP#X6 from Renesas Electronics is a 16-bit R8C/Tiny Series microcontroller in the R8C/25 Group, featuring 48 KB flash program memory, 2.5 KB RAM, and 2 × 1 KB on-chip data flash blocks. It operates from 2.2 V to 5.5 V, supports -40°C to +85°C ambient temperature (D version), and integrates a 10-bit 12-channel ADC, dual UARTs, LIN hardware module, I²C interface, and four 16-/8-bit timers - deployed in industrial control panels requiring embedded real-time monitoring and communication.
For engineers reviewing the R5F21257SDFP#X6 datasheet, R5F21257SDFP#X6 pinout, R5F21257SDFP#X6 application, or R5F21257SDFP#X6 equivalent, key selection criteria include its 52-pin LQFP package (PLQP0052JA-A), D-grade industrial temperature rating, integrated data flash for parameter storage, LIN bus support via UART0+TimerRA, and low-power stop mode (0.7 µA at 3.0 V).
Technical Context
The R5F21257SDFP#X6 implements the R8C/Tiny CPU core with 89 fundamental instructions and executes at 50 ns minimum instruction time (20 MHz XIN clock, 3.0–5.5 V). Its memory architecture separates 48 KB flash program ROM from two independent 1 KB data flash blocks - enabling field-updatable calibration data without erasing application code.
Peripheral integration includes Timer RD (16-bit × 2 channels with input capture/output compare), Timer RE (real-time clock with compare match), hardware LIN transceiver (using UART0 and Timer RA), and dual UARTs supporting asynchronous and clock-synchronous serial I/O - all mapped to dedicated pins in the 52-pin LQFP footprint with no shared-function conflicts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C/Tiny 16-bit, 89 instructions, 20 MHz max operation (50 ns min instruction time) |
| Memory | 48 KB flash program ROM + 2 × 1 KB data flash blocks + 2.5 KB RAM |
| Supply Voltage | 2.2 V to 5.5 V - supports direct connection to 3.3 V or 5 V system rails |
| Temperature Range | -40°C to +85°C (D version) - qualified for industrial control environments |
| ADC | 10-bit resolution, 12 input channels (AN0–AN11), internal reference selectable |
| Timers | Timer RA/RB (8-bit × 2), Timer RD (16-bit × 2 w/ input capture & output compare), Timer RE (RTC w/ compare match) |
| Serial Interfaces | UART0/UART1 (2 channels), I²C bus interface, clock-synchronous serial I/O w/ chip select, hardware LIN (UART0 + Timer RA) |
Pinout & Package
Package: 52-pin molded-plastic LQFP (PLQP0052JA-A), 0.65 mm pin pitch, 10 mm × 10 mm body size, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0_0–P0_7 | Analog inputs / I/O ports | AN0–AN7; configurable as general-purpose CMOS I/O or ADC inputs with internal pull-up enable |
| P1_0–P1_3 | Key interrupt inputs / analog inputs | KI0–KI3 and AN8–AN11 - support wake-up from low-power modes on external key press |
| P2_0–P2_7 | Timer RD I/O / LED drive ports | TRDIOA0–TRDIOD1 and TRDCLK; capable of driving LEDs directly with current-limiting design |
| P3_3–P3_5, P3_7 | I²C & serial interface signals | SSI, SCL, SDA, SSO - support multi-master I²C and daisy-chain synchronous serial topologies |
| P4_2 | VREF input | External reference voltage for ADC - enables precise measurement against stable external source |
| P4_3/P4_4 | XCIN/XCOUT | 32 kHz crystal oscillator input/output - provides low-power RTC clock source independent of main XIN |
| P4_6/P4_7 | XIN/XOUT | Main system clock input/output - accepts ceramic resonator (1–20 MHz) or external clock signal |
| RESET | Active-low reset input | Asynchronous reset assertion - holds MCU in reset until deasserted and power stabilized |
| MODE | Boot mode selection | Must be pulled high via resistor to enter normal user program execution mode |
Key Features
| Feature | Design Value |
|---|---|
| On-chip data flash | Two independent 1 KB blocks - allows simultaneous read-while-write and firmware parameter updates without halting application |
| Hardware LIN module | Integrated LIN 2.0/2.1 transceiver using UART0 + Timer RA - eliminates need for external LIN transceiver IC |
| Low-power operation | 0.7 µA in stop mode (3.0 V, XCIN = 32 kHz) - enables battery-backed real-time clock and wake-on-interrupt functionality |
| Dual UART with clock sync | UART0/UART1 support both asynchronous and clock-synchronous modes - simplifies RS-485, SPI-like, and LIN physical layer interfacing |
| 12-channel 10-bit ADC | Single-scan conversion across all 12 channels in <100 µs - suitable for fast sensor polling in motor control feedback loops |
Applications
| Industrial Control Panel | Home Appliance Motor Controller |
|---|---|
|
Use Scenario: Embedded controller in HVAC control panel managing temperature sensors, relay outputs, display interface, and CAN/LIN communication to zone actuators. IC Role / Device Role / Timing Role: Main system MCU executing closed-loop PID control, reading 12-channel ADC for thermistor arrays, driving 8 LED indicators via P2 ports, and handling LIN messaging to damper modules. Use Value: Integrated LIN hardware and data flash enable reliable field calibration storage and actuator command without external transceivers or EEPROM. |
Use Scenario: Motor speed and fault monitoring unit in washing machine drum drive, interfacing with hall-effect sensors, triac drivers, and user interface buttons. IC Role / Device Role / Timing Role: Real-time motor commutation supervisor using Timer RD input capture for rotor position, UART1 for debug logging, and KI0–KI3 for push-button inputs with wake-from-stop capability. Use Value: 0.7 µA stop-mode current and key-interrupt wake-up allow ultra-low standby power while maintaining responsive UI. |
| Office Equipment Power Manager | Smart Lighting Node Controller |
|
Use Scenario: Standby power sequencer and thermal monitor in multifunction printer, controlling DC-DC converters, fan PWM, and NTC-based temperature sensing. IC Role / Device Role / Timing Role: System power supervisor using VREF-referenced ADC for precision voltage monitoring, Timer RE for real-time thermal logging intervals, and UART0 for service port diagnostics. Use Value: Dual voltage domains (VCC/AVCC) and on-chip voltage detection circuit eliminate need for external supervisors in compact PCB layouts. |
Use Scenario: DALI-compatible lighting node in commercial building automation, receiving digital commands, dimming LED strings via PWM, and reporting status over I²C to gateway. IC Role / Device Role / Timing Role: DALI slave controller using I²C for local sensor data aggregation and UART0 for DALI physical layer (with external half-duplex transceiver), P0/P1 ports for PWM dimming outputs. Use Value: I²C interface with clock stretching support and 12-channel ADC for ambient light and temperature compensation ensure accurate lumen output control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F21256SDFP#X6 | 32 KB program flash, same 2 × 1 KB data flash, identical peripheral set and pinout | Lower code density requirement; suitable when application firmware fits in 32 KB | Select for cost-sensitive designs where full 48 KB is unnecessary and BOM consolidation is prioritized |
| R5F21257SNFP#X6 | Same 48 KB flash and peripherals, but N version (-20°C to +85°C) instead of D version | Commercial/office equipment use only; not rated for extended industrial temperature range | Choose only if operating environment stays within -20°C to +85°C and thermal margin is verified |
Compared with R5F21257SDFP#X6, R5F21256SDFP#X6 reduces flash capacity but maintains identical data flash and industrial temperature rating, while R5F21257SNFP#X6 sacrifices -40°C startup capability for lower cost - making the D-version essential for unheated factory-floor deployments.
Availability
R5F21257SDFP#X6 is available at Aetrix Electronics and suitable for industrial control panels, home appliance motor controllers, and office equipment power managers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.
Supply support for R5F21257SDFP#X6 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 industrial, automotive, and infrastructure markets.
The R8C/25 Group, including R5F21257SDFP#X6, was designed for cost-sensitive, low-power embedded applications requiring integrated data flash, LIN communication, and robust analog interfaces - targeting white goods, industrial HMI, and building automation.
FAQ
What is the maximum operating frequency and corresponding supply voltage range for the R5F21257SDFP#X6?
The R5F21257SDFP#X6 achieves a minimum instruction execution time of 50 ns at 20 MHz, requiring a supply voltage of 3.0 V to 5.5 V. At 10 MHz, it operates down to 2.7 V, and at 5 MHz, it supports as low as 2.2 V - enabling flexible power rail selection across 3.3 V and 5 V systems while maintaining full peripheral functionality.
Does the R5F21257SDFP#X6 support hardware LIN communication, and how is it implemented?
Yes, the R5F21257SDFP#X6 includes a hardware LIN module implemented using UART0 and Timer RA. This configuration meets LIN 2.0/2.1 specifications without external transceiver components, with dedicated register control for break detection, sync field handling, and checksum calculation - reducing BOM count and PCB area in automotive and appliance networks.
How many data flash blocks does the R5F21257SDFP#X6 contain, and what is their endurance rating?
The R5F21257SDFP#X6 contains two independent 1 KB data flash blocks, each rated for 10,000 write/erase cycles. This allows separate storage of calibration parameters, device IDs, or usage logs - with one block active while the other is being rewritten - ensuring continuous operation during field updates without application interruption.
What package type and pin count does the R5F21257SDFP#X6 use, and is it RoHS-compliant?
The R5F21257SDFP#X6 uses a 52-pin molded-plastic LQFP package (PLQP0052JA-A) with 0.65 mm pin pitch and 10 mm × 10 mm body size. It is RoHS-compliant and lead-free, meeting EU Directive 2011/65/EU requirements - verified in Renesas' official environmental compliance documentation.
What is the lowest current consumption mode supported by the R5F21257SDFP#X6, and under what conditions is it achieved?
The R5F21257SDFP#X6 achieves 0.7 µA in stop mode at 3.0 V with the 32 kHz XCIN clock active. This mode retains RAM content, RTC function via Timer RE, and enables wake-up via external interrupts (INT0–INT3) or key inputs (KI0–KI3), making it ideal for battery-powered remote sensors and always-on control interfaces.
R5F21257SDFP#X6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 52-LQFP
- Series:
- R8C/2x/25
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Core Processor:
- R8C
- Core Size:
- 16-Bit
- Speed:
- 20MHz
- Connectivity:
- I2C, LINbus, SIO, SSU, UART/USART
- Peripherals:
- POR, Voltage Detect, WDT
- Number of I/O:
- 41
- Program Memory Size:
- 48KB (48K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 2.5K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.2V ~ 5.5V
- Data Converters:
- A/D 12x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F21257SDFP#X6 FAQ
1.How can I place an order for R5F21257SDFP#X6 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F21257SDFP#X6 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 R5F21257SDFP#X6 reliable?
The price and inventory of R5F21257SDFP#X6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21257SDFP#X6 is usually 5 days.
3.What payment methods are accepted for R5F21257SDFP#X6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21257SDFP#X6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F21257SDFP#X6?
R5F21257SDFP#X6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F21257SDFP#X6 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 R5F21257SDFP#X6?
For technical support, including R5F21257SDFP#X6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21257SDFP#X6 requirements.
6.How does Aetrix verify that R5F21257SDFP#X6 is sourced from the original manufacturer or authorized distributors?
All R5F21257SDFP#X6 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 R5F21257SDFP#X6 meets industry standards.
7.What is the process for return or replacement of R5F21257SDFP#X6?
All R5F21257SDFP#X6 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21257SDFP#X6, 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 R5F21257SDFP#X6 part is unused and in its original packaging.
Return procedure for R5F21257SDFP#X6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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