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Renesas R5F21238KFP#U1
- Part No.:
- R5F21238KFP#U1
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
R5F21238KFP#U1.pdf
- Description:
- IC MCU 16BIT 64KB FLASH 48LFQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,640
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Product details
Overview
R5F21238KFP#U1 from Renesas Electronics is a 16-bit R8C/23 Group microcontroller with CAN 2.0B interface, 64 KB program flash, 1 KB × 2 data flash, 3 KB RAM, and 48-pin LQFP (PLQP0048KB-A) package. It features an R8C CPU core, 12-channel 10-bit ADC, hardware LIN module, UART0/UART1, I²C bus interface, and operates from −40°C to +125°C - designed for automotive body control and industrial FA networking.
For engineers reviewing the R5F21238KFP#U1 datasheet, R5F21238KFP#U1 pinout, R5F21238KFP#U1 application, or R5F21238KFP#U1 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in CAN/LIN-enabled systems, and validated alternative options for temperature-critical embedded designs.
Technical Context
The R5F21238KFP#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, segregated program ROM (64 KB), dual-block data flash (1 KB × 2), and 3 KB SRAM - enabling firmware updates and parameter storage without external EEPROM.
Peripheral integration centers on deterministic real-time control: Timer RD (16-bit × 2 channels with input capture/output compare), CAN 2.0B controller (16 message slots), hardware LIN (using Timer RA + UART0), and dual UARTs with clock-synchronous serial I/O support - all coordinated via 7-level priority interrupt system and on-chip oscillators (high-speed adjustable, low-speed).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C 16-bit CISC core with 89 instructions; enables compact code size and deterministic timing for safety-critical tasks. |
| Operating Temperature | −40°C to +125°C (K version); qualified for under-hood automotive and high-ambient industrial environments. |
| Flash Memory | 64 KB program ROM + 1 KB × 2 data flash; supports field firmware updates and nonvolatile parameter storage. |
| CAN Interface | Single CAN 2.0B controller with 16 message buffers; handles full CAN protocol stack offload including arbitration and error handling. |
| A/D Converter | 10-bit SAR ADC with 12 analog inputs; provides sufficient resolution for sensor monitoring (e.g., temperature, voltage, current). |
| Package | 48-pin LQFP (PLQP0048KB-A), 0.5 mm pitch, 7 mm × 7 mm body; compatible with standard reflow assembly and automotive PCB layouts. |
| Supply Voltage | 2.7–5.5 V operation; supports wide-input power rails common in 12 V automotive and industrial power domains. |
Pinout & Package
Package: 48-pin plastic LQFP (PLQP0048KB-A), 0.5 mm pitch, 7 mm × 7 mm body, exposed pad not specified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0_0 to P0_7 | Analog input / I/O port | 12-channel ADC inputs (AN0–AN7) plus general-purpose CMOS I/O; configurable pull-up, direction register per pin. |
| P1_0 to P1_7 | General I/O / KI/INT | Key interrupt inputs (KI0–KI3), UART0 (RXD0/TXD0), CLK0, and INT1; supports wake-up from low-power modes. |
| P2_0 to P2_7 | Timer RD I/O | TRDIOA0–TRDIOD1 and TRDCLK pins; enable quadrature decoding, PWM generation, and edge-triggered capture on 8 pins. |
| P3_0, P3_1, P3_3–P3_7 | I²C / SSI / CAN / Reset | SDA/SCL (I²C), SSI/SCS/SSCK/SSO (serial I/O), CTX0/CRX0 (CAN TX/RX), RESET; multiplexed for flexible peripheral routing. |
| P4_2, P4_3, P4_4, P4_5, P4_6, P4_7 | VREF / Input-only / XIN/XOUT | VREF sets ADC reference; XIN/XOUT supports crystal/resonator or external clock; MODE, RESET, INT0 are dedicated control inputs. |
| P6_0 to P6_7 | TREO / UART1 / INT2/INT3 | TREO outputs divided clock; UART1 (TXD1/RXD1); INT2/INT3 for external event triggering; TRAO/TRBO for Timer RA/RB outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Flash Memory Architecture | Separate 64 KB program ROM and 2 KB data flash (1 KB × 2 blocks) enables safe firmware updates and runtime parameter logging without external memory. |
| Hardware CAN 2.0B Controller | Integrated 16-slot message buffer, automatic retransmission, and error confinement - reduces CPU load and ensures deterministic CAN communication. |
| Hardware LIN Module | Combines Timer RA and UART0 to implement full LIN 2.x master/slave functionality without software protocol stack overhead. |
| Temperature-Rated Operation | K-version qualification (−40°C to +125°C) meets AEC-Q100 Grade 2 requirements for engine bay and powertrain applications. |
| On-Chip Oscillators | High-speed (adjustable) and low-speed on-chip oscillators eliminate need for external crystals in cost-sensitive or space-constrained designs. |
Applications
| Automotive Body Control Unit | Industrial Fieldbus Node |
|---|---|
Use Scenario: Centralized control of door locks, window lifts, mirror adjustment, and lighting in modern vehicles. IC Role / Device Role / Timing Role: Primary MCU managing CAN-based communication with gateway ECU and LIN-peripheral actuators. Use Value: Integrated CAN 2.0B and hardware LIN reduce BOM count and ensure synchronized actuator response within 2 ms latency. |
Use Scenario: Distributed I/O node in factory automation systems connecting sensors, valves, and HMIs over CANopen network. IC Role / Device Role / Timing Role: Real-time controller executing cyclic process data exchange and local PID loop regulation. Use Value: 12-channel ADC and Timer RD input capture support direct analog sensor interfacing and precise timing of valve actuation pulses. |
| Engine Bay Sensor Hub | Smart Power Distribution Module |
Use Scenario: Aggregating temperature, pressure, and voltage readings near combustion chamber and feeding data to main ECU. IC Role / Device Role / Timing Role: High-temperature-tolerant signal conditioner and CAN transmitter with built-in diagnostics. Use Value: −40°C to +125°C operation and on-chip voltage detection enable reliable function without external thermal derating or supervision ICs. |
Use Scenario: Solid-state relay controller managing 12 V/24 V loads with overcurrent, short-circuit, and thermal protection. IC Role / Device Role / Timing Role: Fault-monitoring MCU sampling current sense ADC, driving MOSFET gates, and reporting status via CAN. Use Value: Data flash stores trip history and calibration offsets; watchdog timer and oscillation stop detection prevent latch-up during load transients. |
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 |
|---|---|---|---|
| R5F21238JFP#U0 | Same core, peripherals, and memory; rated for −40°C to +85°C ambient only. | Suitable for cabin-mounted modules (e.g., HVAC control) but not under-hood locations. | Select when operating temperature does not exceed +85°C and cost optimization is prioritized over extended thermal range. |
| RA4M2-240F016A | Arm® Cortex®-M23 core, 100 MHz, 256 KB flash, 32 KB SRAM, no integrated CAN/LIN; requires external transceivers. | Targets next-gen designs requiring higher performance, security (TrustZone), and USB connectivity - not drop-in replacement. | Choose for new designs needing scalable architecture, long-term roadmap support, and enhanced cryptographic capabilities. |
Compared with R5F21238JFP#U0, the R5F21238KFP#U1 adds guaranteed operation up to +125°C - critical for engine compartment placement - while retaining identical pinout and firmware compatibility. Against RA4M2-240F016A, it trades raw performance for proven CAN/LIN integration and legacy toolchain continuity.
Availability
R5F21238KFP#U1 is available at Aetrix Electronics and suitable for automotive body control units, industrial fieldbus nodes, engine bay sensor hubs, and smart power distribution modules requiring stable component supply across extended temperature ranges.
Supply support for R5F21238KFP#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, power, and SoC solutions for automotive, industrial, and IoT markets.
The R5F21238KFP#U1 belongs to the R8C/23 Group - a family of 16-bit MCUs engineered for cost-sensitive, real-time automotive and industrial control applications where CAN/LIN integration and extended temperature reliability are essential.
FAQ
What is the maximum operating frequency and supply voltage range for the R5F21238KFP#U1?
The R5F21238KFP#U1 supports a maximum XIN clock frequency of 20 MHz at VCC = 3.0–5.5 V, delivering a 50 ns minimum instruction execution time. It also operates at 10 MHz with VCC as low as 2.7 V, enabling flexibility in power-constrained or battery-backed applications. The K-version rating ensures stable function across the full −40°C to +125°C ambient range under these conditions.
Does the R5F21238KFP#U1 include hardware support for LIN communication?
Yes, the R5F21238KFP#U1 integrates a hardware LIN module that combines Timer RA and UART0 to implement full LIN 2.x master and slave functionality. This eliminates the need for bit-banged software LIN stacks, reduces CPU overhead, and guarantees precise timing compliance with LIN specification jitter requirements - confirmed in Renesas Hardware Manual REJ03B0097.
How is the data flash memory organized and what is its endurance rating in the R5F21238KFP#U1?
The R5F21238KFP#U1 contains two independent 1 KB data flash blocks (total 2 KB), each rated for 10,000 write/erase cycles. These blocks reside at fixed addresses 02400h–027FFh and 02800h–02BFFh and support byte/word programming and sector erasure - enabling robust storage of calibration data, device configuration, and event logs without external EEPROM.
What package type and pin pitch does the R5F21238KFP#U1 use?
The R5F21238KFP#U1 uses a 48-pin plastic LQFP package designated PLQP0048KB-A, with 0.5 mm pin pitch and 7 mm × 7 mm body dimensions. This JEDEC-standard footprint ensures compatibility with automated SMT assembly lines and matches land patterns used across the R8C/22 and R8C/23 families - simplifying board design reuse.
Can the R5F21238KFP#U1 operate without an external crystal oscillator?
Yes, the R5F21238KFP#U1 includes both high-speed and low-speed on-chip oscillators. The high-speed oscillator is adjustable and sufficient for most applications requiring up to 20 MHz operation, eliminating the need for external crystals or resonators unless precision timing (e.g., for CAN bit rate accuracy < ±1%) or low-jitter clocking is required - in which case XIN/XOUT with a 20 MHz crystal is recommended.
R5F21238KFP#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:
- Not 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:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 3K 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:
R5F21238KFP#U1 FAQ
1.How can I place an order for R5F21238KFP#U1 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F21238KFP#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 R5F21238KFP#U1 reliable?
The price and inventory of R5F21238KFP#U1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21238KFP#U1 is usually 5 days.
3.What payment methods are accepted for R5F21238KFP#U1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21238KFP#U1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F21238KFP#U1?
R5F21238KFP#U1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F21238KFP#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 R5F21238KFP#U1?
For technical support, including R5F21238KFP#U1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21238KFP#U1 requirements.
6.How does Aetrix verify that R5F21238KFP#U1 is sourced from the original manufacturer or authorized distributors?
All R5F21238KFP#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 R5F21238KFP#U1 meets industry standards.
7.What is the process for return or replacement of R5F21238KFP#U1?
All R5F21238KFP#U1 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21238KFP#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 R5F21238KFP#U1 part is unused and in its original packaging.
Return procedure for R5F21238KFP#U1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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