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Renesas R5F21237KFP#U1
- Part No.:
- R5F21237KFP#U1
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
R5F21237KFP#U1.pdf
- Description:
- IC MCU 16BIT 48KB FLASH 48LFQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,653
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Product details
Overview
R5F21237KFP#U1 from Renesas Electronics is a 16-bit R8C/23 Group microcontroller with CAN 2.0B interface, 48 KB program flash, 1 KB × 2 data flash, 2.5 KB RAM, and 48-pin LQFP (PLQP0048KB-A) package. It operates from −40°C to +125°C, supports LIN hardware protocol via UART0 and Timer RA, and integrates a 10-bit 12-channel ADC for automotive and industrial control applications.
For engineers reviewing the R5F21237KFP#U1 datasheet, R5F21237KFP#U1 pinout, R5F21237KFP#U1 application, or R5F21237KFP#U1 equivalent, key selection criteria include its K-version extended temperature rating, dual data flash blocks for EEPROM emulation, CAN+LIN coexistence capability, and compatibility with Renesas' R8C development tools and emulator debugger environment.
Technical Context
The R5F21237KFP#U1 implements the R8C CPU core with 89 fundamental instructions and executes at 50 ns minimum instruction time (20 MHz XIN, 3.0–5.5 V). Its memory architecture includes 1 Mbyte address space, fixed interrupt vector table at 0FFDCh–0FFFFh, and dedicated SFR area (01300h–0147Fh) for CAN module control.
Peripheral integration centers on deterministic real-time I/O: Timer RD provides two 16-bit channels with input capture/output compare; UART0 and UART1 support asynchronous and clock-synchronous serial communication; the CAN module offers 16 message slots compliant with ISO 11898-1:2003 (CAN 2.0B).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C 16-bit CISC core with register bank switching and 20-bit PC/INTB addressing |
| Flash Memory | 48 KB program ROM + 1 KB × 2 data flash (10,000 write/erase cycles) for nonvolatile parameter storage |
| Operating Temp | −40°C to +125°C (K version), enabling under-hood automotive use without derating |
| CAN Interface | Single-channel CAN 2.0B controller with 16 message buffers and dedicated SFR region (01300h–0147Fh) |
| ADC | 10-bit successive approximation ADC with 12 analog inputs and internal reference voltage support |
| Package | 48-pin LQFP (PLQP0048KB-A), 7 mm × 7 mm, 0.5 mm pitch, RoHS-compliant |
| Supply Voltage | 2.7–5.5 V operation; supports 20 MHz XIN clock only at VCC ≥ 3.0 V |
Pinout & Package
Package: 48-pin plastic LQFP (PLQP0048KB-A), 7 mm × 7 mm body, 0.5 mm lead pitch, exposed pad not specified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0_0–P0_7 | Analog Input / GPIO | 12-channel ADC inputs (AN0–AN7) and general-purpose CMOS I/O with programmable pull-up |
| P6_1 / CRX0 P6_2 / CTX0 |
CAN Transceiver Interface | Dedicated differential CAN receive (CRX0) and transmit (CTX0) pins, electrically isolated from other peripherals |
| P1_4 / TXD0 P1_5 / RXD0 |
UART0 Serial I/O | Full-duplex UART channel used jointly with Timer RA for hardware LIN physical layer implementation |
| P3_3 / SSI P3_4 / SCS P3_5 / SSCK P3_7 / SSO |
Clock-Synchronous Serial I/O | Four-pin SPI-compatible interface supporting chip-select-driven multi-slave communication |
| XIN / XOUT | External Clock Input/Output | Crystal/resonator connection points for main system clock; XOUT is output-only, XIN is input-only |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Flash Blocks | Two independent 1 KB flash blocks enable wear-leveling and background reprogramming during runtime |
| Hardware LIN Support | Integrated LIN 2.0/2.1 physical layer via UART0 + Timer RA, eliminating external transceiver in cost-sensitive nodes |
| Extended Temperature Range | K-version qualification (−40°C to +125°C) allows direct placement in engine control units and powertrain modules |
| Dedicated CAN SFR Area | Separate 384-byte SFR region (01300h–0147Fh) isolates CAN register access from general peripheral conflicts |
| Emulator Debugger Support | Reserved 16 KB memory region (20000h–23FFFh) enables real-time debugging without application code relocation |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time monitoring of throttle position, coolant temperature, and oxygen sensor signals while managing fuel injection timing and spark advance. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop combustion control algorithms with CAN-based actuator coordination and LIN-connected sensors. Use Value: 10-bit ADC resolution and deterministic 50 ns instruction timing ensure precise sensor sampling and sub-millisecond actuator response. |
Use Scenario: Centralized management of door locks, window lifts, lighting, and HVAC functions across distributed LIN slave nodes. IC Role / Device Role / Timing Role: Master node implementing LIN protocol stack and CAN gateway between infotainment and powertrain networks. Use Value: Integrated LIN hardware reduces BOM cost and software overhead; CAN 2.0B ensures interoperability with OEM diagnostic tools. |
| Industrial Motor Drive | Off-Highway Vehicle Telematics |
Use Scenario: Closed-loop speed and torque control of 3-phase BLDC motors using hall-effect feedback and PWM generation. IC Role / Device Role / Timing Role: Real-time motion controller interfacing with gate drivers, current sense amplifiers, and CAN bus for remote diagnostics. Use Value: Timer RD's input capture and output compare channels synchronize PWM edges with motor commutation events. |
Use Scenario: Data aggregation from GPS, IMU, and hydraulic pressure sensors for fleet tracking and predictive maintenance reporting. IC Role / Device Role / Timing Role: Edge-processing node performing sensor fusion, CAN message filtering, and cellular modem handshaking. Use Value: −40°C to +125°C operation ensures reliability in unheated cab environments; dual data flash enables secure firmware updates over-the-air. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit automotive microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F21237JFP | Same core, memory, and peripherals but rated for −40°C to +85°C ambient | Suitable for cabin-mounted modules (e.g., HVAC controls) where under-hood thermal stress is absent | Select R5F21237JFP when full K-version temperature range is unnecessary and cost optimization is prioritized |
| R5F21238KFP | 64 KB program ROM (+16 KB), same data flash, RAM, and temperature rating | Required for applications needing larger bootloader, OTA update partition, or expanded application logic | Choose R5F21238KFP when firmware size exceeds 48 KB or future scalability demands headroom |
Compared with R5F21237JFP, the R5F21237KFP#U1 delivers guaranteed operation at 125°C-critical for engine bay placement-while R5F21238KFP extends code capacity without altering thermal or peripheral specifications, making it ideal for feature-rich derivatives.
Availability
R5F21237KFP#U1 is available at Aetrix Electronics and suitable for automotive powertrain control, industrial motor drives, and off-highway telematics requiring stable component supply across extended lifecycle programs.
Supply support for R5F21237KFP#U1 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, and power solutions for automotive, industrial, and IoT markets.
The R8C/23 Group, including R5F21237KFP#U1, was designed for cost-sensitive, thermally demanding embedded control applications requiring CAN/LIN networking, integrated flash, and extended temperature operation.
FAQ
What is the maximum operating frequency supported by R5F21237KFP#U1?
The R5F21237KFP#U1 supports a maximum external crystal frequency of 20 MHz at VCC = 3.0–5.5 V, yielding a 50 ns minimum instruction execution time. At lower supply voltages (2.7–5.5 V), the maximum clock is reduced to 10 MHz (100 ns instruction time). The high-speed on-chip oscillator is factory-trimmed and adjustable via software.
Does R5F21237KFP#U1 include hardware support for LIN communication?
Yes, R5F21237KFP#U1 integrates hardware LIN functionality using UART0 combined with Timer RA to generate accurate baud rates and synchronization pulses per LIN 2.0/2.1 specifications. This eliminates the need for external LIN transceivers in master-node implementations.
How is data flash endurance specified for R5F21237KFP#U1?
The R5F21237KFP#U1 specifies 10,000 write/erase cycles for its 1 KB × 2 data flash blocks. This endurance rating applies under standard operating conditions (VCC = 2.7–5.5 V, TA = −40°C to +125°C) and enables reliable EEPROM-like data logging and configuration storage.
What package type and dimensions does R5F21237KFP#U1 use?
R5F21237KFP#U1 uses the PLQP0048KB-A package: a 48-pin LQFP with 7 mm × 7 mm body size, 0.5 mm lead pitch, and compliance with JEDEC MS-026. Pin 1 location is marked by a notch or dot per standard LQFP mechanical drawings.
Can R5F21237KFP#U1 operate without an external crystal?
Yes, R5F21237KFP#U1 includes an on-chip high-speed oscillator (trimmable) and low-speed oscillator, allowing standalone operation without external crystals. However, CAN and LIN timing accuracy requirements typically mandate use of the XIN/XOUT circuit with a 20 MHz ceramic resonator or crystal.
R5F21237KFP#U1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 48-LQFP
- Series:
- R8C/2x/23
- Packaging:
- Tray
- Product Status:
- Not For New Designs
- Programmable:
- Verified
- Core Processor:
- R8C
- Core Size:
- 16-Bit
- Speed:
- 16MHz
- Connectivity:
- CANbus, 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):
- 2.7V ~ 5.5V
- Data Converters:
- A/D 12x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F21237KFP#U1 FAQ
1.How can I place an order for R5F21237KFP#U1 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F21237KFP#U1 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 R5F21237KFP#U1 reliable?
The price and inventory of R5F21237KFP#U1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21237KFP#U1 is usually 5 days.
3.What payment methods are accepted for R5F21237KFP#U1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21237KFP#U1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F21237KFP#U1?
R5F21237KFP#U1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F21237KFP#U1 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 R5F21237KFP#U1?
For technical support, including R5F21237KFP#U1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21237KFP#U1 requirements.
6.How does Aetrix verify that R5F21237KFP#U1 is sourced from the original manufacturer or authorized distributors?
All R5F21237KFP#U1 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 R5F21237KFP#U1 meets industry standards.
7.What is the process for return or replacement of R5F21237KFP#U1?
All R5F21237KFP#U1 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21237KFP#U1, 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 R5F21237KFP#U1 part is unused and in its original packaging.
Return procedure for R5F21237KFP#U1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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