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Renesas R5F2121CKFP#U0
- Part No.:
- R5F2121CKFP#U0
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
R5F2121CKFP#U0.pdf
- Description:
- IC MCU 16BIT 128KB FLASH 48LFQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,158
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Product details
Overview
R5F2121CKFP#U0 from Renesas Electronics is a 16-bit R8C/21 Group microcontroller featuring an embedded 128 KB program flash, dual 1 KB data flash blocks, 6 KB RAM, 12-channel 10-bit A/D converter, hardware LIN module (using Timer RA and UART0), and 48-pin LQFP package. It operates from 2.7–5.5 V at up to 20 MHz and targets automotive body electronics requiring nonvolatile data logging and LIN communication.
For engineers reviewing the R5F2121CKFP#U0 datasheet, R5F2121CKFP#U0 pinout, R5F2121CKFP#U0 application, or R5F2121CKFP#U0 equivalent, this page delivers verified technical context, validated pin functions, real-world use cases in automotive subsystems, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The R5F2121CKFP#U0 implements the R8C CPU core with 89 fundamental instructions and executes at 50 ns minimum instruction time (20 MHz, 3.0–5.5 V). Its memory architecture includes separate program ROM and dual-block data flash (1 KB × 2), enabling reliable firmware updates and parameter storage without external EEPROM.
Peripheral integration includes two UARTs (UART0 for LIN, UART1 for general serial), I²C bus interface (2-wire), clock-synchronous serial I/O with chip select, four 8/16-bit timers (RA, RB, RD×2, RE), and on-chip oscillators (high-speed with frequency adjustment, low-speed) with XIN/XOUT crystal support and oscillation stop detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C 16-bit CISC core with 89 instructions and register bank switching |
| Flash Memory | 128 KB program ROM + 2 KB data flash (1 KB × 2 blocks), 10,000 write/erase cycles |
| RAM | 6 KB on-chip SRAM for variables, stack, and interrupt handling |
| A/D Converter | 10-bit resolution, 12 input channels (AN0–AN11), internal reference support via VREF |
| Timers | Timer RA (8-bit), RB (8-bit), RD (16-bit × 2, with input capture/output compare), RE (8-bit compare match) |
| Serial Interfaces | UART0 (LIN-capable), UART1, I²C bus (2-wire), clock-synchronous serial I/O with chip select (SSI/SCS/SSCK/SSO) |
| Supply Voltage | 2.7–5.5 V; supports 20 MHz operation at 3.0–5.5 V (K version) |
| Operating Temperature | −40°C to +125°C (K version, qualified for under-hood automotive applications) |
Pinout & Package
Package: 48-pin plastic LQFP (PLQP0048KB-A), 7 mm × 7 mm body, 0.5 mm pin pitch, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0_0–P0_7 | Analog Input / GPIO | 12-channel A/D inputs (AN0–AN7); configurable as CMOS I/O with software-selectable pull-up |
| P1_0–P1_3 | Key Input / A/D / Serial | KI0–KI3 key interrupt inputs; AN8–AN11 analog inputs; RXD0/TXD0 for UART0 |
| P2_0–P2_7 | Timer RD I/O | TRDIOA0–TRDIOD1 and TRDCLK for 16-bit timer input capture/output compare operations |
| P3_0, P3_1 | Timer Output | TRAO (Timer RA output), TRBO (Timer RB output) for PWM or timing signal generation |
| P3_3–P3_5, P3_7 | I²C / SSI / LIN | SDA/SCL (I²C), SSI/SCS/SSCK/SSO (clock-synchronous serial), and LIN physical layer interface via UART0 |
| XIN / XOUT | Crystal Oscillator | Supports external crystal (1–20 MHz) or ceramic resonator; XOUT is output-only |
| VCC / VSS / AVCC / AVSS | Power Supply | Dual power domains: digital (VCC/VSS) and analog (AVCC/AVSS) with dedicated decoupling requirement |
| RESET / MODE | Reset Control | Active-low RESET input; MODE tied high via resistor to enable normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Hardware LIN Module | Integrated LIN 2.0/2.1 support via UART0 + Timer RA - eliminates external transceiver for basic node implementation |
| Dual Data Flash Blocks | Two independent 1 KB data flash blocks allow background erase/write while executing code from main ROM |
| On-Chip Oscillators | High-speed oscillator with software-adjustable frequency (±2% accuracy) plus low-speed oscillator for standby mode |
| 12-Channel 10-bit A/D | Simultaneous sampling not supported, but channel scan mode enables rapid sequential conversion across all 12 inputs |
| Interrupt Architecture | 7 priority levels, 11 internal + 5 external + 4 software interrupt sources - supports deterministic real-time response |
| Emulator Debug Support | Dedicated debug area (20000h–23FFFh) reserved for Renesas E8/E10 emulator - no user code or data placement permitted |
Applications
| Body Control Module (BCM) | Door Module Controller |
|---|---|
Use Scenario: Centralized control of lighting, window lifts, mirror adjustment, and door lock actuation in passenger vehicles. IC Role / Device Role / Timing Role: Primary MCU managing CAN/LIN gateway functions, sensor polling (door position, window obstruction), and PWM-driven motor control. Use Value: Dual data flash enables secure storage of calibration data and usage logs; 12-channel A/D monitors multiple potentiometers and thermistors without external MUX. |
Use Scenario: Local intelligence inside vehicle door assemblies for window anti-pinch, mirror folding, and interior light sequencing. IC Role / Device Role / Timing Role: Standalone LIN slave node communicating with BCM over single-wire LIN bus using hardware-assisted protocol timing. Use Value: Integrated LIN module reduces BOM cost and PCB footprint; −40°C to +125°C rating ensures reliability in sealed door environments. |
| Climate Control Actuator | Seat Position Memory System |
Use Scenario: Driving stepper or DC motors for HVAC blend doors, recirculation flaps, and air distribution vanes. IC Role / Device Role / Timing Role: Real-time motor control MCU with precise PWM generation (via Timer RA/RB) and feedback acquisition (A/D on potentiometer, thermistor). Use Value: 16-bit Timer RD provides accurate input capture for encoder-based position feedback; on-chip voltage detector ensures safe shutdown during brown-out. |
Use Scenario: Storing and recalling driver seat position settings (fore/aft, height, lumbar, headrest) using nonvolatile memory and motor control. IC Role / Device Role / Timing Role: Dedicated memory manager and motor sequencer interfacing with LIN master for configuration and status reporting. Use Value: Dual 1 KB data flash blocks allow atomic update of seat profiles without corrupting active settings; K-version temperature grade supports under-seat mounting. |
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 |
|---|---|---|---|
| R5F2121AKFP | 96 KB program ROM, same 2 KB data flash, identical peripherals and pinout | Suitable where firmware size < 96 KB suffices; lower cost due to reduced flash density | Select when application code fits within 96 KB and BOM cost optimization is prioritized over future firmware headroom |
| R5F2122CKFP | R8C/22 Group: adds CAN controller, increases A/D to 16 channels, retains same package and data flash | Required for nodes needing CAN bus connectivity (e.g., gateway modules, advanced sensors) | Choose when CAN communication is mandatory; note CAN peripheral requires different register initialization and interrupt handling |
Compared with R5F2121CKFP#U0, R5F2121AKFP offers lower memory capacity at reduced cost for stable firmware, while R5F2122CKFP extends functionality with integrated CAN-making it suitable for higher-tier automotive networks but requiring layout and firmware adaptation.
Availability
R5F2121CKFP#U0 is available at Aetrix Electronics and suitable for automotive body electronics, LIN-based sensor nodes, and industrial motor controllers requiring stable component supply, extended temperature operation, and long-term lifecycle support.
Supply support for R5F2121CKFP#U0 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 for automotive and industrial markets.
The R8C/21 Group, including R5F2121CKFP#U0, was designed specifically for cost-sensitive automotive body electronics applications requiring LIN compliance, robust A/D capability, and extended temperature operation without external nonvolatile memory.
FAQ
What is the maximum operating frequency and supply voltage range for the R5F2121CKFP#U0?
The R5F2121CKFP#U0 operates at up to 20 MHz with a supply voltage range of 3.0–5.5 V (K version). At 10 MHz, it supports down to 2.7 V. This allows flexible power design in automotive 12 V systems with transient suppression and wide-input DC-DC converters. The high-speed on-chip oscillator supports software trimming for ±2% accuracy across voltage and temperature.
Does the R5F2121CKFP#U0 include hardware LIN support, and how is it implemented?
Yes, the R5F2121CKFP#U0 includes dedicated hardware LIN support via its UART0 peripheral combined with Timer RA for baud rate generation and synchronization. This meets LIN 2.0/2.1 physical layer requirements without external transceivers in basic implementations. The R5F2121CKFP#U0 uses internal resources to manage break field detection, sync byte handling, and checksum calculation - reducing firmware overhead versus bit-banged solutions.
How is the data flash organized in the R5F2121CKFP#U0, and what is its endurance?
The R5F2121CKFP#U0 contains two independent 1 KB data flash blocks (Block A and Block B), each rated for 10,000 write/erase cycles. They reside at fixed addresses 02400h–027FFh (Block A) and 02800h–02BFFh (Block B). This dual-block structure enables wear leveling and atomic updates - critical for storing calibration data, odometer values, or LIN node configuration in automotive applications.
What are the key differences between the R8C/20 and R8C/21 Groups, and why does the R5F2121CKFP#U0 belong to the latter?
The R5F2121CKFP#U0 belongs to the R8C/21 Group solely due to its embedded dual 1 KB data flash blocks - a feature absent in the R8C/20 Group. All other peripherals, CPU core, pinout, and electrical specifications are identical between the two groups. This distinction makes the R5F2121CKFP#U0 suitable for applications requiring field-updatable parameters or event logging without external memory.
Which development tools and debug interfaces are supported for the R5F2121CKFP#U0?
The R5F2121CKFP#U0 is supported by Renesas' E8 and E10 emulators via the standard 14-pin JTAG interface. Debug memory space is reserved at addresses 20000h–23FFFh and must not be used for application code. The R5F2121CKFP#U0 also supports on-chip debugging using the built-in ROM monitor and SWD-compatible protocols, enabling real-time variable inspection and breakpoint execution during LIN message validation and motor control tuning.
R5F2121CKFP#U0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 48-LQFP
- Series:
- R8C/2x/21
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- R8C
- Core Size:
- 16-Bit
- Speed:
- 16MHz
- Connectivity:
- I2C, LINbus, SIO, SSU, UART/USART
- Peripherals:
- POR, Voltage Detect, WDT
- Number of I/O:
- 41
- Program Memory Size:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 6K 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:
R5F2121CKFP#U0 FAQ
1.How can I place an order for R5F2121CKFP#U0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F2121CKFP#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 R5F2121CKFP#U0 reliable?
The price and inventory of R5F2121CKFP#U0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F2121CKFP#U0 is usually 5 days.
3.What payment methods are accepted for R5F2121CKFP#U0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F2121CKFP#U0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F2121CKFP#U0?
R5F2121CKFP#U0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F2121CKFP#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 R5F2121CKFP#U0?
For technical support, including R5F2121CKFP#U0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F2121CKFP#U0 requirements.
6.How does Aetrix verify that R5F2121CKFP#U0 is sourced from the original manufacturer or authorized distributors?
All R5F2121CKFP#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 R5F2121CKFP#U0 meets industry standards.
7.What is the process for return or replacement of R5F2121CKFP#U0?
All R5F2121CKFP#U0 units undergo pre-shipment inspection (PSI). If there is an issue with R5F2121CKFP#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 R5F2121CKFP#U0 part is unused and in its original packaging.
Return procedure for R5F2121CKFP#U0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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