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Renesas R5F21257SNFP#X6
- Part No.:
- R5F21257SNFP#X6
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 52-LQFP
- Datasheet:
-
R5F21257SNFP#X6.pdf
- Description:
- IC MCU 16BIT 48KB FLASH 52LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,433
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Product details
Overview
R5F21257SNFP#X6 from Renesas Electronics is a 16-bit single-chip microcontroller in the R8C/25 Group, featuring an R8C/Tiny Series CPU core, 48 KB flash program memory, 2.5 KB RAM, and dual 1 KB data flash blocks. It operates at up to 20 MHz (50 ns min. instruction time), supports 12-channel 10-bit A/D conversion, hardware LIN via UART0/timer RA, and real-time clock functionality in timer RE. It targets embedded control in consumer appliances and industrial HMI panels.
For engineers reviewing the R5F21257SNFP#X6 datasheet, R5F21257SNFP#X6 pinout, R5F21257SNFP#X6 application, or R5F21257SNFP#X6 equivalent, key selection criteria include its 52-pin LQFP (PLQP0052JA-A) package, -20°C to +85°C N-version temperature grade, integrated LIN transceiver support, dual data flash blocks for EEPROM emulation, and low-power stop mode (0.7 µA @ 3.0 V).
Technical Context
The R5F21257SNFP#X6 implements the R8C/Tiny CPU core with 89 fundamental instructions and 1 Mbyte address space. Its peripheral set includes two UARTs (UART0 with LIN hardware support), one I²C bus interface, three clock-synchronous serial interfaces (one with chip select), four 8-/16-bit timers (RA, RB, RD×2, RE), and a 10-bit A/D converter with internal reference voltage input (VREF).
It integrates three clock generation circuits: XIN-based crystal/resonator oscillator (up to 20 MHz), high-speed/low-speed on-chip oscillators (with frequency adjustment), and XCIN-based 32 kHz RTC oscillator. Power management includes on-chip voltage detection, power-on reset, and wait/stop modes achieving sub-µA current consumption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C/Tiny 16-bit, 89 instructions, 1 Mbyte address space - enables compact code and deterministic real-time execution. |
| Memory | 48 KB flash program ROM + 2 × 1 KB data flash + 2.5 KB RAM - supports firmware updates and nonvolatile parameter storage without external EEPROM. |
| ADC | 10-bit resolution, 12 input channels, VREF-referenced - allows precise analog sensing across multiple sensors in appliance control. |
| LIN Interface | Hardware LIN 2.0/2.1 via UART0 + timer RA - eliminates software bit-banging overhead and ensures protocol compliance in automotive body electronics. |
| Timers | Timer RD (16-bit × 2, input capture/output compare), Timer RE (RTC + compare match) - enables motor phase timing, pulse-width measurement, and calendar-based wake-up. |
| Power Modes | Stop mode: 0.7 µA @ 3.0 V, Wait mode: 2.0 µA @ 3.0 V (f(XCIN)=32 kHz) - extends battery life in always-on sensor nodes or remote controls. |
| Supply Range | VCC = 2.2 V to 5.5 V - accommodates wide-input DC-DC outputs and brown-out resilience in industrial power rails. |
Pinout & Package
Package: 52-pin LQFP (PLQP0052JA-A), 10 mm × 10 mm, 0.65 mm pitch, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0_0–P0_7 / AN0–AN7 | Analog input / I/O port | 8 dedicated A/D input pins with shared GPIO function - enables direct connection of potentiometers, thermistors, or voltage dividers without external muxing. |
| P1_0–P1_3 / KI0–KI3 | Key interrupt inputs | Dedicated debounced key-scan inputs with interrupt capability - simplifies front-panel button handling in consumer HMI designs. |
| P1_4/TXD0, P1_5/RXD0 | UART0 data I/O | Full-duplex serial interface with hardware LIN modulation support - reduces MCU load for automotive sub-node communication. |
| P3_4/SDA, P3_5/SCL | I²C bus interface | Open-drain bidirectional I²C pins with internal pull-up option - connects directly to EEPROM, temperature sensors, or display controllers. |
| P4_3/XCIN, P4_4/XCOUT | 32 kHz RTC crystal interface | Dedicated low-frequency crystal oscillator pins - provides accurate real-time clock and low-power wake-up timing independent of main system clock. |
| RESET | Active-low reset input | Asynchronous reset pin accepting external push-button or supervisor IC signal - ensures reliable initialization under power-up or fault conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Dual data flash blocks | 2 × 1 KB independently erasable sectors enable wear-leveling and robust parameter logging for field-upgradable devices. |
| Hardware LIN module | Integrated LIN 2.0/2.1 physical layer support via UART0 and timer RA eliminates need for external transceiver in cost-sensitive body electronics. |
| Real-time clock (timer RE) | Configurable RTC with compare match interrupt allows calendar-based scheduling and low-power periodic wake-up without external RTC IC. |
| 12-channel 10-bit ADC | Simultaneous sampling not supported, but channel sequencing and trigger synchronization with timers enable precise motor current or temperature monitoring. |
| On-chip oscillators | High-speed on-chip oscillator with frequency adjustment + 32 kHz XCIN circuit - reduces BOM count by eliminating external crystals in non-critical timing applications. |
Applications
| Home Appliance Control | Industrial HMI Panel |
|---|---|
|
Use Scenario: Microcontroller in washing machine main board managing motor drive, water level sensing, and user interface. IC Role / Device Role / Timing Role: Central control unit executing state-machine logic, reading 12-channel ADC for pressure/temperature, and driving LED indicators via P2_0–P2_7 LED ports. Use Value: Dual data flash blocks store calibration offsets and usage logs; hardware LIN interfaces with door lock and detergent dispenser modules. |
Use Scenario: Standalone operator panel with touch keys, LCD backlight control, and RS-485 gateway to PLC. IC Role / Device Role / Timing Role: Embedded controller handling key scan (KI0–KI3), PWM dimming (timer RD), and UART1-to-RS485 translation. Use Value: 48 KB flash accommodates bootloader + application firmware; stop-mode current (0.7 µA) enables battery backup during mains failure. |
| Consumer Audio System | Smart Lighting Node |
|
Use Scenario: Digital audio amplifier subsystem with volume control, input source switching, and thermal protection. IC Role / Device Role / Timing Role: Peripheral manager reading potentiometer (AN0–AN3), controlling relay drivers (P3_0/TRAO), and monitoring heatsink temp (AN7). Use Value: Integrated 10-bit ADC eliminates external signal conditioning; I²C (P3_4/SDA, P3_5/SCL) connects to EEPROM for preset storage. |
Use Scenario: DALI-compliant LED driver node with color tuning, dimming curve storage, and ambient light compensation. IC Role / Device Role / Timing Role: DALI slave controller using UART0 for protocol handling, ADC (AN4–AN6) for photodiode feedback, and timer RE for fade timing. Use Value: Data flash stores lamp calibration data and dimming profiles; LIN-capable UART0 allows firmware update over existing vehicle lighting bus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F21256SNFP | 32 KB program flash, same 2.5 KB RAM and dual 1 KB data flash - 16 KB smaller code space. | Suitable for simpler control tasks with smaller firmware footprint; identical pinout and peripheral set. | Select when application code size fits within 32 KB and cost optimization is prioritized over future firmware headroom. |
| R5F21257SDFP | Same memory and peripherals, but D-version (-40°C to +85°C operating range) and enhanced ESD/latch-up immunity. | Required for industrial environments with extended temperature cycling or higher noise immunity demands. | Choose for deployments outside commercial temperature range or where AEC-Q100 alignment is beneficial despite not being automotive-qualified. |
Compared with R5F21256SNFP, the R5F21257SNFP#X6 offers 16 KB additional flash for feature-rich firmware and OTA update staging; compared with R5F21257SDFP, it trades industrial-grade reliability for lower cost in benign ambient environments.
Availability
R5F21257SNFP#X6 is available at Aetrix Electronics and suitable for home appliance control, industrial HMI panels, consumer audio systems, and smart lighting nodes requiring stable component supply across multi-year production cycles.
Supply support for R5F21257SNFP#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 enterprise applications.
The R8C/25 Group, including the R5F21257SNFP#X6, was designed for cost-sensitive, low-power embedded control in consumer and industrial equipment where integrated peripherals, flash flexibility, and proven reliability are essential.
FAQ
What is the maximum operating frequency and corresponding supply voltage range for the R5F21257SNFP#X6?
The R5F21257SNFP#X6 achieves a minimum instruction execution time of 50 ns at 20 MHz, requiring VCC = 3.0 V to 5.5 V. At 10 MHz, it supports VCC = 2.7 V to 5.5 V; at 5 MHz, VCC = 2.2 V to 5.5 V. These ranges are specified in the R8C/25 Group datasheet Rev.3.00 and validated for the N-version temperature grade.
Does the R5F21257SNFP#X6 support hardware LIN communication, and how is it implemented?
Yes, the R5F21257SNFP#X6 implements hardware LIN 2.0/2.1 via UART0 combined with timer RA for baud rate generation and sync field detection. This offloads LIN protocol handling from firmware, ensuring timing accuracy and reducing CPU utilization - confirmed in Section 1.2 and Figure 1.1 of the R8C/25 Group documentation.
How many A/D converter channels does the R5F21257SNFP#X6 have, and what is their resolution and reference configuration?
The R5F21257SNFP#X6 integrates a single 10-bit A/D converter with 12 input channels (AN0–AN11). Reference voltage is selectable between AVCC or an external voltage applied to the VREF pin (P4_2), enabling flexible full-scale range adaptation for precision sensor interfacing.
What are the data flash endurance and programming voltage requirements for the R5F21257SNFP#X6?
The R5F21257SNFP#X6 provides two 1 KB data flash blocks rated for 10,000 erase/write cycles. Programming and erasure require VCC = 2.7 V to 5.5 V - no external high-voltage supply is needed, simplifying in-system reprogramming in field-deployed devices.
Is the R5F21257SNFP#X6 pin-compatible with other members of the R8C/25 Group in the same package variant?
Yes, all R8C/25 Group devices in the PLQP0052JA-A (52-pin LQFP) package - including R5F21254SNFP through R5F21258SNFP - share identical pin assignments and electrical characteristics. Firmware and PCB layouts are interchangeable across this memory-density family.
R5F21257SNFP#X6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 52-LQFP
- Series:
- R8C/2x/25
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- 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:
- -
- RAM Size:
- 2.5K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.2V ~ 5.5V
- Data Converters:
- A/D 12x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F21257SNFP#X6 FAQ
1.How can I place an order for R5F21257SNFP#X6 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F21257SNFP#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 R5F21257SNFP#X6 reliable?
The price and inventory of R5F21257SNFP#X6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21257SNFP#X6 is usually 5 days.
3.What payment methods are accepted for R5F21257SNFP#X6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21257SNFP#X6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F21257SNFP#X6?
R5F21257SNFP#X6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F21257SNFP#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 R5F21257SNFP#X6?
For technical support, including R5F21257SNFP#X6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21257SNFP#X6 requirements.
6.How does Aetrix verify that R5F21257SNFP#X6 is sourced from the original manufacturer or authorized distributors?
All R5F21257SNFP#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 R5F21257SNFP#X6 meets industry standards.
7.What is the process for return or replacement of R5F21257SNFP#X6?
All R5F21257SNFP#X6 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21257SNFP#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 R5F21257SNFP#X6 part is unused and in its original packaging.
Return procedure for R5F21257SNFP#X6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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