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Renesas R5F21237DFP#U0
- Part No.:
- R5F21237DFP#U0
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
R5F21237DFP#U0.pdf
- Description:
- IC MCU 16BIT 48KB FLASH 48LFQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,294
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Product details
Overview
R5F21237DFP from Renesas Electronics is a 16-bit R8C/23 Group microcontroller with 48 KB program flash, 2.5 KB RAM, and dual 1 KB data flash blocks. It integrates a CAN 2.0B module (16-slot), 12-channel 10-bit ADC, LIN hardware interface, and operates at up to 20 MHz (50 ns min instruction time) across -40°C to +85°C. It targets automotive body control and industrial fieldbus nodes requiring embedded networking and analog sensing.
For engineers reviewing the R5F21237DFP datasheet, R5F21237DFP pinout, R5F21237DFP application, or R5F21237DFP equivalent, key selection criteria include CAN 2.0B compliance, on-chip data flash endurance (10,000 write/erase cycles), 48-pin LQFP package compatibility, and support for LIN master/slave operation using Timer RA and UART0.
Technical Context
The R5F21237DFP implements the R8C CPU core with 89 fundamental instructions and a 1 Mbyte unified address space. Its memory subsystem includes separate program ROM and dual-block data flash (1 KB × 2), enabling reliable firmware updates and parameter storage without external EEPROM.
Peripheral integration centers on real-time communication and sensing: one CAN 2.0B controller with 16 message buffers, two UARTs (UART0 for LIN, UART1 for general serial), I²C bus interface, 16-bit Timer RD with input capture/output compare, and 10-bit A/D converter with 12 analog inputs and internal voltage reference support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C 16-bit, 89 instructions, 50 ns min execution at 20 MHz |
| Memory | 48 KB program flash + 2 × 1 KB data flash + 2.5 KB RAM |
| CAN Interface | 1× CAN 2.0B controller with 16 message slots and dedicated SFR area |
| A/D Converter | 10-bit resolution, 12-channel single-ended input, VREF pin supported |
| Operating Temp | -40°C to +85°C (D version), 3.0–5.5 V supply range at 20 MHz |
| Package | 48-pin LQFP (PLQP0048KB-A), 0.5 mm pitch, 7 mm × 7 mm body |
| Timers | Timer RA/RB (8-bit), Timer RD (16-bit × 2), Timer RE (8-bit compare) |
| Serial Interfaces | UART0 (LIN-capable), UART1, I²C, clock-sync serial I/O with chip select |
Pinout & Package
Package: 48-pin plastic LQFP (PLQP0048KB-A), 0.5 mm pin pitch, 7 mm × 7 mm body, exposed pad not specified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC/AVCC (Pin 11) | Power supply input | Core and analog domain supply (3.0–5.5 V); AVCC requires decoupling to AVSS |
| RESET (Pin 7) | Reset input | Active-low asynchronous reset; internal pull-up enabled by default |
| XIN/XOUT (Pins 10/8) | Crystal oscillator interface | Supports ceramic resonator or crystal (1–20 MHz); XOUT is output-only |
| CRX0/CTX0 (Pins 42/43) | CAN transceiver interface | Dedicated differential CAN receive/transmit pins compliant with ISO 11898-1 |
| AN0–AN11 (Pins 36–47, 24, 28–30) | Analog inputs | 12-channel 10-bit ADC inputs; AN0–AN7 mapped to P0_0–P0_7, others to P1/P3 |
| TRAIO/RXD0/TXD0 (Pins 20/22/23) | Multiplexed peripheral I/O | Timer RA I/O, UART0 RX/TX - enables LIN physical layer via UART0 + Timer RA |
| P3_4/SDA & P3_5/SCL (Pins 3/1) | I²C bus interface | Open-drain bidirectional data/clock pins supporting standard/fast-mode I²C |
| INT0–INT3 (Pins 25, 26, 27, 31) | External interrupt inputs | Four independent edge-triggered interrupts; INT0 tied to Timer RD input |
Key Features
| Feature | Design Value |
|---|---|
| Data Flash Endurance | 10,000 write/erase cycles per 1 KB block - enables robust calibration data logging |
| CAN 2.0B Compliance | Full protocol stack support including identifier masking, message filtering, and error handling |
| LIN Hardware Integration | Timer RA + UART0 combine to implement LIN 2.0/2.1 master/slave without software bit-banging |
| On-Chip Oscillators | High-speed (adjustable 1–20 MHz) and low-speed on-chip oscillators - eliminates need for external crystals in cost-sensitive designs |
| Voltage Detection | Integrated VDD monitor with programmable threshold - ensures safe brown-out reset during power transitions |
| Emulator Debug Support | Dedicated debug area (20000h–23FFFh) - enables non-intrusive in-circuit debugging without code relocation |
Applications
| Automotive Body Control Unit | Industrial CAN Sensor Node |
|---|---|
Use Scenario: Centralized control of door locks, window lifts, and interior lighting in passenger vehicles. IC Role / Device Role / Timing Role: Main MCU executing LIN slave communication with actuators and CAN gateway messaging to engine ECU. Use Value: Integrated LIN hardware reduces CPU load by >30% vs. bit-banged implementation; dual data flash blocks allow concurrent firmware update and parameter retention. | Use Scenario: Distributed temperature/pressure monitoring in factory automation systems with CAN bus backbone. IC Role / Device Role / Timing Role: Sensor interface MCU acquiring analog signals via 12-channel ADC and transmitting processed data over CAN 2.0B. Use Value: 16-slot CAN buffer supports burst transmission of multi-sensor readings without host intervention; 10-bit ADC provides ±1 LSB INL for <0.1% measurement accuracy. |
| Smart HVAC Controller | Medical Diagnostic Equipment Subsystem |
Use Scenario: Embedded climate control unit managing fan speed, valve position, and ambient sensor fusion in commercial HVAC systems. IC Role / Device Role / Timing Role: Real-time controller interfacing with PWM fans, stepper valves, and thermistor networks via ADC and GPIO. Use Value: Timer RD's input capture capability precisely measures thermistor RC decay time; on-chip voltage detection prevents erratic behavior during line sags. | Use Scenario: Front-end signal conditioning and isolation module in portable ultrasound or ECG devices. IC Role / Device Role / Timing Role: Analog acquisition MCU digitizing biopotential signals and forwarding data via UART to main processor. Use Value: Dedicated AVCC/AVSS pins and VREF input minimize noise coupling; 2.5 KB RAM accommodates real-time FIR filtering buffers without external memory. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F21237JFP | Same core, memory, peripherals; J version rated for -40°C to +85°C (identical temp spec) | No functional difference; identical pinout and firmware compatibility | Select when sourcing from distributors listing J-version stock; no design changes required |
| R5F21237KFP | Same core, memory, peripherals; K version rated for -40°C to +125°C | Required for under-hood automotive or high-temp industrial enclosures | Choose for extended temperature operation; verify thermal derating of external components |
Compared with R5F21237JFP, the R5F21237DFP offers identical functionality but reflects Renesas' legacy D-version marking convention; versus R5F21237KFP, it trades extended temperature range for lower cost in ambient-controlled environments.
Availability
R5F21237DFP is available at Aetrix Electronics and suitable for automotive body electronics, industrial CAN sensor nodes, smart HVAC controllers, and medical diagnostic subsystems requiring stable component supply and long-term lifecycle support.
Supply support for R5F21237DFP 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/23 Group, including the R5F21237DFP, was designed for cost-sensitive automotive and industrial applications requiring integrated CAN, LIN, and analog interfaces in compact 48-pin packages.
FAQ
What is the maximum operating frequency and corresponding supply voltage range for the R5F21237DFP?
The R5F21237DFP supports a maximum operating frequency of 20 MHz at a supply voltage of 3.0 V to 5.5 V. At this speed, the minimum instruction execution time is 50 ns. For 10 MHz operation, the supply range extends down to 2.7 V, enabling lower-power operation in battery-powered systems while maintaining full peripheral functionality.
Does the R5F21237DFP include on-chip debug capabilities, and what interface is used?
Yes, the R5F21237DFP includes on-chip debug support via Renesas' standard E8/E8a emulator interface. The debug area is allocated to memory addresses 20000h–23FFFh, and no external debug header is required. This allows non-intrusive breakpoint setting, register inspection, and real-time variable monitoring during development without modifying application code or layout.
How many analog input channels does the R5F21237DFP support, and what is the reference voltage configuration?
The R5F21237DFP supports 12 analog input channels (AN0–AN11) for its 10-bit A/D converter. Reference voltage can be selected internally (VCC) or externally via the dedicated VREF pin (Pin 40), allowing precise ratio-metric measurements against stable external references. AVCC and AVSS pins must be decoupled with 0.1 µF capacitors to ensure ADC accuracy.
What is the data flash endurance specification for the R5F21237DFP, and how is it organized?
The R5F21237DFP includes two independent 1 KB data flash blocks with an endurance rating of 10,000 write/erase cycles per block. This organization enables wear-leveling strategies where one block stores active parameters while the other holds backup copies, extending effective lifetime beyond 20,000 cycles in typical firmware update scenarios.
Is the R5F21237DFP pin-compatible with other members of the R8C/23 Group, such as R5F21236DFP or R5F21238DFP?
Yes, all R8C/23 Group MCUs in the FP (48-pin LQFP) package - including R5F21236DFP, R5F21237DFP, and R5F21238DFP - share identical pinouts and electrical characteristics. Only ROM size (32/48/64 KB) and RAM capacity (2/2.5/3 KB) differ; firmware and hardware designs are fully interchangeable within the same package variant without PCB modification.
R5F21237DFP#U0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 48-LQFP
- Series:
- R8C/2x/23
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Verified
- Core Processor:
- R8C
- Core Size:
- 16-Bit
- Speed:
- 20MHz
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F21237DFP#U0 FAQ
1.How can I place an order for R5F21237DFP#U0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F21237DFP#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 R5F21237DFP#U0 reliable?
The price and inventory of R5F21237DFP#U0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21237DFP#U0 is usually 5 days.
3.What payment methods are accepted for R5F21237DFP#U0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21237DFP#U0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F21237DFP#U0?
R5F21237DFP#U0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F21237DFP#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 R5F21237DFP#U0?
For technical support, including R5F21237DFP#U0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21237DFP#U0 requirements.
6.How does Aetrix verify that R5F21237DFP#U0 is sourced from the original manufacturer or authorized distributors?
All R5F21237DFP#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 R5F21237DFP#U0 meets industry standards.
7.What is the process for return or replacement of R5F21237DFP#U0?
All R5F21237DFP#U0 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21237DFP#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 R5F21237DFP#U0 part is unused and in its original packaging.
Return procedure for R5F21237DFP#U0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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