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Renesas R5F2121CJFP#U0
- Part No.:
- R5F2121CJFP#U0
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
R5F2121CJFP#U0.pdf
- Description:
- IC MCU 16BIT 128KB FLASH 48LFQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,815
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Product details
Overview
R5F2121CJFP#U0 from Renesas Electronics is a 16-bit R8C/21 Group microcontroller with 128 KB program flash, 6 KB RAM, and dual 1 KB data flash blocks for nonvolatile parameter storage. It integrates a 10-bit 12-channel ADC, hardware LIN module (using Timer RA and UART0), UART0/UART1, I²C bus interface, and four 16-/8-bit timers - deployed in automotive body control modules requiring deterministic real-time response.
For engineers reviewing the R5F2121CJFP#U0 datasheet, R5F2121CJFP#U0 pinout, R5F2121CJFP#U0 application, or R5F2121CJFP#U0 equivalent, this MCU delivers verified LIN-compliant communication, on-chip voltage detection and power-on reset, -40°C to +85°C operation, and LQFP-48 packaging compatible with standard reflow profiles.
Technical Context
The R5F2121CJFP#U0 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 separates 128 KB program ROM (04000h–23FFFh) from dual 1 KB data flash blocks (02400h–02BFFh), enabling field-updatable calibration data without erasing application code.
Peripheral integration includes UART0 configured as LIN master/slave via dedicated hardware logic, Timer RD with input capture/output compare on two 16-bit channels, and simultaneous analog acquisition across 12 pins (AN0–AN11) with internal reference (VREF) support - all managed through fixed-priority 7-level interrupt vectors mapped to 0FFDCh–0FFFFh.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C 16-bit CISC core with register bank switching and 20-bit PC for 1 Mbyte linear address space |
| Flash Memory | 128 KB program ROM + 2 × 1 KB data flash blocks - enables firmware updates and persistent configuration storage |
| ADC | 10-bit resolution, 12-channel single-ended input, internal VREF support - suitable for sensor signal digitization in vehicle subsystems |
| LIN Interface | Hardware LIN 2.0/2.1 compliant via UART0 + Timer RA - eliminates software bit-banging overhead and ensures timing accuracy |
| Operating Voltage | 3.0 V to 5.5 V supply range - supports direct connection to automotive 5 V rail with built-in voltage detection and POR |
| Temperature Range | -40°C to +85°C (J version) - qualified for passenger compartment and under-hood control unit deployment |
| Package | 48-pin LQFP (PLQP0048KB-A, 7 mm × 7 mm, 0.5 mm pitch) - compatible with automated SMT assembly and IPC Class 2 reliability |
Pinout & Package
Package: 48-pin plastic LQFP (PLQP0048KB-A), 7 mm × 7 mm body, 0.5 mm lead pitch, exposed pad not present. RoHS-compliant, moisture sensitivity level (MSL) 3 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC/AVCC (Pin 11) | Power supply and analog reference | Dual-purpose 3.0–5.5 V supply pin; AVCC requires local decoupling to minimize ADC noise coupling |
| VSS/AVSS (Pin 9) | Digital/analog ground return | Common low-impedance reference for digital logic and ADC; separate AVSS routing recommended for precision measurement |
| XIN (Pin 10), XOUT (Pin 8) | Crystal oscillator inputs | Supports external crystal (1–20 MHz) or ceramic resonator; XOUT is output-only and must not be driven externally |
| RESET (Pin 7) | Active-low reset input | Asynchronous reset assertion clears CPU registers and halts execution; internal pull-up enabled after power-on |
| AN0–AN11 (Pins 36–47, 24, 28–30) | Analog input channels | 12 dedicated pins with programmable gain and sampling control - enable multi-sensor monitoring (e.g., temp, voltage, position) |
| UART0 TXD0/RXD0 (Pins 23/22) | LIN physical layer interface | Direct connection to LIN transceiver; RXD0 supports automatic wake-up detection per LIN spec |
| P3_4/SDA, P3_5/SCL (Pins 3/1) | I²C bidirectional data/clock | Open-drain outputs with internal pull-up option - supports up to 400 kHz fast-mode communication with EEPROM or sensors |
Key Features
| Feature | Design Value |
|---|---|
| Hardware LIN Module | Integrated UART0 + Timer RA co-processor enables ISO 17987-compliant frame generation, checksum calculation, and sync field detection without CPU intervention |
| Data Flash Endurance | 10,000 write/erase cycles per 1 KB block - sufficient for lifetime calibration updates in automotive ECUs (e.g., battery SOC tables) |
| On-Chip Oscillators | High-speed (1–20 MHz adjustable) and low-speed (10–50 kHz) RC oscillators - allow clock source redundancy and ultra-low-power sleep modes |
| Interrupt Architecture | 16 total sources (11 internal, 5 external), 7 priority levels, fixed vector table - guarantees sub-1 µs latency for critical events like LIN header detection |
| Watchdog Timer | 15-bit counter with programmable prescaler and reset/start select - prevents system lockup in safety-critical functions such as door latch control |
Applications
| Body Control Module (BCM) | Seat Position Controller |
|---|---|
Use Scenario: Centralized management of lighting, window lifts, door locks, and mirror adjustment in modern vehicles. IC Role / Device Role / Timing Role: Primary MCU executing LIN slave nodes for distributed actuators while coordinating CAN gateway functions via external interface. Use Value: Dual data flash blocks store seat memory profiles and lighting presets independently of firmware, enabling over-the-air personalization without full reflash. |
Use Scenario: Real-time tracking and motorized adjustment of driver/passenger seat position using potentiometer feedback and Hall-effect sensors. IC Role / Device Role / Timing Role: Sensor fusion processor acquiring 12-channel analog inputs (position, current, temperature) and driving H-bridge via PWM outputs. Use Value: 10-bit ADC with internal VREF ensures ±1% position accuracy across temperature; hardware LIN reduces BOM cost versus discrete transceiver solutions. |
| Climate Control Panel | Steering Column Switch Interface |
Use Scenario: User interface for HVAC system with rotary encoders, push buttons, and LED indicators - communicating via LIN to main climate ECU. IC Role / Device Role / Timing Role: Dedicated LIN slave handling button debounce, LED dimming PWM, and encoder quadrature decoding. Use Value: Key input interrupt (KI0–KI3) supports 4 independent mechanical switch inputs with automatic noise filtering - eliminates external RC networks. |
Use Scenario: Aggregation of multifunction switch signals (cruise control, audio, phone) mounted on steering wheel and transmission tunnel. IC Role / Device Role / Timing Role: LIN node translating switch closures into standardized message frames with configurable wake-up capability. Use Value: Built-in voltage detection circuit monitors battery health and triggers safe shutdown before brownout-induced erratic behavior during engine cranking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F2121CKFP#U0 | Identical functionality but rated for -40°C to +125°C ambient; higher thermal grade package | Required for under-hood applications (e.g., engine bay sensors) where junction temperature exceeds 85°C | Select when operating environment exceeds 85°C ambient or requires extended temperature qualification |
| R5F2120CJFP#U0 | R8C/20 Group variant with no data flash; same 128 KB program ROM, 6 KB RAM, and peripheral set | Suitable for cost-sensitive designs where nonvolatile parameter storage is handled externally (e.g., EEPROM) | Choose if calibration data persistence is unnecessary or implemented via external serial memory |
Compared with R5F2121CJFP#U0, the R5F2121CKFP#U0 offers extended temperature operation without functional change, while the R5F2120CJFP#U0 removes data flash to reduce cost - making the R5F2121CJFP#U0 optimal for LIN-based automotive modules needing embedded calibration storage at industrial temperature range.
Availability
R5F2121CJFP#U0 is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor controllers, and medical diagnostic interfaces requiring stable component supply and long-term lifecycle assurance.
Supply support for R5F2121CJFP#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 devices for automotive and industrial markets.
The R8C/21 Group, including R5F2121CJFP#U0, was designed specifically for cost-optimized automotive sub-systems requiring LIN communication, analog sensing, and robust real-time control - targeting body electronics, comfort systems, and distributed actuation.
FAQ
What is the maximum operating frequency of the R5F2121CJFP#U0?
The R5F2121CJFP#U0 supports a maximum external crystal frequency of 20 MHz on the XIN/XOUT pins, yielding a 50 ns minimum instruction execution time. Its high-speed on-chip oscillator is adjustable from 1 MHz to 20 MHz and may be used as the system clock without external components.
Does the R5F2121CJFP#U0 include hardware support for LIN communication?
Yes, the R5F2121CJFP#U0 integrates a dedicated hardware LIN module combining UART0 and Timer RA to implement ISO 17987-compliant frame formatting, checksum generation, and automatic wake-up detection - eliminating software timing constraints and reducing CPU load.
How many analog-to-digital converter channels does the R5F2121CJFP#U0 provide?
The R5F2121CJFP#U0 includes a single 10-bit successive-approximation ADC with 12 analog input channels (AN0–AN11), supporting simultaneous sampling control and internal voltage reference (VREF) input for accurate sensor measurements across its operating temperature range.
What is the data flash endurance specification for the R5F2121CJFP#U0?
The R5F2121CJFP#U0 provides two independent 1 KB data flash blocks with guaranteed endurance of 10,000 write/erase cycles each - validated for use cases such as storing calibration coefficients, odometer values, or user preferences in automotive ECUs.
Is the R5F2121CJFP#U0 pin-compatible with other members of the R8C/21 Group?
Yes, all R8C/21 Group MCUs in the PLQP0048KB-A package - including R5F21216JFP#U0 through R5F2121CJFP#U0 - share identical 48-pin LQFP pinouts, allowing hardware reuse across memory variants while maintaining consistent peripheral mapping and signal routing.
R5F2121CJFP#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:
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F2121CJFP#U0 FAQ
1.How can I place an order for R5F2121CJFP#U0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F2121CJFP#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 R5F2121CJFP#U0 reliable?
The price and inventory of R5F2121CJFP#U0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F2121CJFP#U0 is usually 5 days.
3.What payment methods are accepted for R5F2121CJFP#U0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F2121CJFP#U0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F2121CJFP#U0?
R5F2121CJFP#U0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F2121CJFP#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 R5F2121CJFP#U0?
For technical support, including R5F2121CJFP#U0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F2121CJFP#U0 requirements.
6.How does Aetrix verify that R5F2121CJFP#U0 is sourced from the original manufacturer or authorized distributors?
All R5F2121CJFP#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 R5F2121CJFP#U0 meets industry standards.
7.What is the process for return or replacement of R5F2121CJFP#U0?
All R5F2121CJFP#U0 units undergo pre-shipment inspection (PSI). If there is an issue with R5F2121CJFP#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 R5F2121CJFP#U0 part is unused and in its original packaging.
Return procedure for R5F2121CJFP#U0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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