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Renesas R5F2121AJFP#U0
- Part No.:
- R5F2121AJFP#U0
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
R5F2121AJFP#U0.pdf
- Description:
- IC MCU 16BIT 96KB FLASH 48LFQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,948
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Product details
Overview
R5F2121AJFP#U0 from Renesas Electronics is a 16-bit R8C/21 Group microcontroller featuring the R8C CPU core, 96 KB program flash ROM, 1 KB × 2 data flash (2 KB total), and 5 KB RAM in a 48-pin LQFP package. It operates at up to 20 MHz (VCC = 3.0–5.5 V), integrates a 10-bit 12-channel ADC, hardware LIN module (using Timer RA and UART0), and supports automotive-grade ambient temperature range of −40°C to +85°C.
For engineers reviewing the R5F2121AJFP#U0 datasheet, R5F2121AJFP#U0 pinout, R5F2121AJFP#U0 application, or R5F2121AJFP#U0 equivalent, this MCU delivers deterministic real-time control with dual data flash blocks for safe firmware updates, LIN bus compliance for vehicle body electronics, and integrated analog sensing - critical for ECU design, motor control subsystems, and embedded safety-critical modules requiring nonvolatile parameter storage.
Technical Context
The R5F2121AJFP#U0 implements the R8C CPU core with 89 fundamental instructions and executes at minimum 50 ns per instruction (20 MHz). Its memory architecture separates 96 KB program ROM (04000h–0FFFFh) from two dedicated 1 KB data flash blocks (02400h–02BFFh), enabling independent erase/write cycles without disrupting code execution.
Peripheral integration includes Timer RD (16-bit × 2 channels with input capture/output compare), UART0 (LIN-capable), UART1, I²C bus interface, and clock-synchronous serial I/O with chip select - all mapped to a fixed 41-pin CMOS I/O port structure with programmable pull-up and individual direction control per pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C 16-bit CISC core with 89 instructions; enables compact, deterministic code for real-time embedded control. |
| Flash Memory | 96 KB program ROM + 1 KB × 2 data flash; supports field firmware updates and parameter storage without external EEPROM. |
| RAM | 5 KB on-chip SRAM; sufficient for stack, variables, and interrupt service routines in automotive body control applications. |
| ADC | 10-bit resolution, 12-channel SAR converter; provides accurate sensor signal acquisition for temperature, voltage, and position feedback. |
| LIN Module | Hardware LIN 2.0/2.1 compliant via UART0 + Timer RA; eliminates software bit-banging overhead and ensures protocol timing accuracy. |
| Operating Temp | −40°C to +85°C (J version); qualified for under-hood and cabin-mounted automotive electronics per AEC-Q100 stress test requirements. |
| Supply Voltage | 3.0–5.5 V; compatible with standard 5 V automotive power rails and tolerant of battery transients down to 3 V. |
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 ADC inputs (AN0–AN7) + general-purpose I/O; enable mixed-signal sensor interfacing with shared pin functionality. |
| P1_4 / TXD0 P1_5 / RXD0 |
UART0 Transceiver | Dedicated LIN physical layer interface; supports automatic baud rate detection and break signal generation per LIN spec. |
| P1_6 / CLK0 | Serial Clock I/O | Provides synchronous clock for SPI-like peripherals or external device coordination without consuming timer resources. |
| P3_3 / SSI P3_4 / SCS P3_5 / SSCK P3_7 / SSO |
Clock-Synchronous Serial I/O | Full-duplex 4-wire interface supporting daisy-chain or multi-drop configurations for sensors or display drivers. |
| P4_2 / VREF | ADC Reference Input | Accepts external precision reference (e.g., 2.5 V) to improve ADC accuracy beyond internal VCC-based scaling. |
| RESET | Active-Low Reset Input | Asynchronous reset assertion halts CPU, clears registers, and forces boot vector fetch; supports external watchdog recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Data Flash Endurance | 10,000 write/erase cycles per block; enables reliable logging of calibration data, fault codes, or mileage counters over vehicle lifetime. |
| Hardware LIN Support | Dedicated UART0 + Timer RA co-processor; guarantees LIN frame timing (e.g., sync field, PID, checksum) without CPU intervention. |
| Oscillation Stop Detection | Monitors XIN clock failure and triggers reset or interrupt; prevents system hang during crystal oscillator faults in harsh environments. |
| Programmable Pull-Up Resistors | Software-selectable weak pull-ups on all I/O ports; eliminates external components for switch inputs or open-drain bus termination. |
| Interrupt Priority Levels | 7-level nested priority scheme; allows precise latency control for time-critical tasks like LIN message handling vs. ADC sampling. |
Applications
| Body Control Module (BCM) | Seat Position Controller |
|---|---|
Use Scenario: Centralized management of door locks, window lifts, mirror adjustment, and interior lighting in modern vehicles. IC Role / Device Role / Timing Role: Primary MCU executing LIN slave node firmware, polling switches, driving relays/LEDs, and communicating with gateway via LIN cluster. Use Value: Dual data flash blocks store seat memory profiles and fault history independently from application code, ensuring zero corruption during OTA updates. |
Use Scenario: Motorized seat adjustment with position feedback, heating control, and memory recall functions. IC Role / Device Role / Timing Role: Real-time position tracking using ADC readings from potentiometers, PWM motor control via Timer RD outputs, and LIN-based command reception. Use Value: 12-channel ADC acquires simultaneous inputs from multiple seat sensors (position, temperature, current), reducing BOM count versus discrete solutions. |
| Climate Control Actuator | Steering Column Switch Interface |
Use Scenario: Driving HVAC blend doors, mode actuators, and blower motors based on cabin temperature and user input. IC Role / Device Role / Timing Role: LIN slave node interpreting commands from climate ECU, reading thermistor networks, and generating precise PWM for stepper/servo motors. Use Value: Integrated 10-bit ADC resolves <1°C temperature changes across 4 thermistor inputs, enabling closed-loop thermal regulation without external signal conditioning. |
Use Scenario: Interfacing multifunction steering wheel buttons (cruise, audio, phone) to vehicle CAN/LIN backbone. IC Role / Device Role / Timing Role: Debounced key scan engine using KI0–KI3 interrupt pins, LIN message formatting, and status LED control via P6_3–P6_5. Use Value: Hardware key interrupt capability (KI0–KI3) detects press/release events with sub-10 ms latency, eliminating polling overhead and improving driver response perception. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F2121AKFP#U0 | Same core, memory, and peripherals; rated for −40°C to +125°C operating range (K version). | Required for under-hood applications exceeding +85°C ambient (e.g., engine bay sensors). | Select when extended temperature qualification is mandatory; otherwise, R5F2121AJFP#U0 offers cost and supply chain advantages for cabin/body locations. |
| R5F2120AJFP#U0 | R8C/20 Group variant with identical package, clock, and peripherals but no data flash (only program ROM). | Suitable for cost-sensitive designs where parameter storage is handled externally or not required. | Choose only if data flash is unnecessary; R5F2121AJFP#U0 provides superior field update capability and data retention robustness. |
Compared with R5F2121AKFP#U0, the R5F2121AJFP#U0 trades extended temperature rating for lower unit cost and broader availability in standard automotive supply chains; versus R5F2120AJFP#U0, it adds critical dual-block data flash essential for functional safety-compliant firmware updates and calibration persistence.
Availability
R5F2121AJFP#U0 is available at Aetrix Electronics and suitable for automotive body electronics, LIN-based sensor nodes, and embedded motor control systems requiring stable component supply across multi-year production cycles.
Supply support for R5F2121AJFP#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 specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.
The R8C/21 Group, including R5F2121AJFP#U0, was designed specifically for cost-effective, high-reliability automotive body electronics and LIN subsystems - balancing performance, integrated peripherals, and AEC-Q100-aligned quality.
FAQ
What is the maximum operating frequency of the R5F2121AJFP#U0?
The R5F2121AJFP#U0 supports a maximum operating frequency of 20 MHz when powered at VCC = 3.0–5.5 V. At this speed, its minimum instruction execution time is 50 ns. Frequency scaling below 20 MHz (e.g., 10 MHz) extends the allowable supply voltage range down to 2.7 V, enhancing flexibility in low-power or battery-operated automotive subsystems.
Does the R5F2121AJFP#U0 include hardware LIN support?
Yes, the R5F2121AJFP#U0 integrates a dedicated hardware LIN module combining UART0 and Timer RA to meet LIN 2.0/2.1 physical and data link layer requirements. This implementation handles sync field detection, identifier filtering, checksum calculation, and break signal generation autonomously - reducing CPU load and guaranteeing protocol timing compliance without software bit-banging.
How much data flash memory does the R5F2121AJFP#U0 provide?
The R5F2121AJFP#U0 includes 1 KB × 2 data flash blocks (2 KB total), located at memory addresses 02400h–02BFFh. Each block supports 10,000 erase/write cycles and can be programmed/erased independently, enabling safe firmware parameter updates, diagnostic log storage, and calibration data retention without affecting program ROM integrity.
What package type and pin count does the R5F2121AJFP#U0 use?
The R5F2121AJFP#U0 uses a 48-pin plastic LQFP package designated PLQP0048KB-A: 7 mm × 7 mm body size, 0.5 mm pin pitch, and RoHS-compliant lead finish. This footprint matches all R8C/20 and R8C/21 Group MCUs, enabling design reuse across memory and feature variants within the same family.
Is the R5F2121AJFP#U0 qualified for automotive applications?
Yes, the R5F2121AJFP#U0 is a J-version device rated for −40°C to +85°C operation and manufactured to Renesas' automotive quality standards. While not explicitly AEC-Q100 certified in this documentation, its specification alignment (temperature range, voltage tolerance, oscillator stop detection, and watchdog timer) confirms suitability for non-safety-critical automotive body electronics per Renesas' "Standard" quality grade classification.
R5F2121AJFP#U0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 48-LQFP
- Series:
- R8C/2x/21
- Packaging:
- Tray
- Product Status:
- Not For New Designs
- 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:
- 96KB (96K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 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:
R5F2121AJFP#U0 FAQ
1.How can I place an order for R5F2121AJFP#U0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F2121AJFP#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 R5F2121AJFP#U0 reliable?
The price and inventory of R5F2121AJFP#U0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F2121AJFP#U0 is usually 5 days.
3.What payment methods are accepted for R5F2121AJFP#U0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F2121AJFP#U0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F2121AJFP#U0?
R5F2121AJFP#U0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F2121AJFP#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 R5F2121AJFP#U0?
For technical support, including R5F2121AJFP#U0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F2121AJFP#U0 requirements.
6.How does Aetrix verify that R5F2121AJFP#U0 is sourced from the original manufacturer or authorized distributors?
All R5F2121AJFP#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 R5F2121AJFP#U0 meets industry standards.
7.What is the process for return or replacement of R5F2121AJFP#U0?
All R5F2121AJFP#U0 units undergo pre-shipment inspection (PSI). If there is an issue with R5F2121AJFP#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 R5F2121AJFP#U0 part is unused and in its original packaging.
Return procedure for R5F2121AJFP#U0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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