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Renesas R5F2123CKFP#U0
- Part No.:
- R5F2123CKFP#U0
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
R5F2123CKFP#U0.pdf
- Description:
- IC MCU 16BIT 128KB FLASH 48LFQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,250
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Product details
Overview
R5F2123CKFP#U0 from Renesas Electronics is a 16-bit R8C/23 Group microcontroller with 128 KB program flash, 6 KB RAM, and embedded 2×1 KB data flash. It features a CAN 2.0B module (16-message buffer), 10-bit 12-channel ADC, hardware LIN interface, and operates across -40°C to 85°C in automotive and industrial networking applications.
For engineers reviewing the R5F2123CKFP#U0 datasheet, R5F2123CKFP#U0 pinout, R5F2123CKFP#U0 application, or R5F2123CKFP#U0 equivalent, this MCU delivers deterministic real-time control with dual UARTs, I²C, clock-synchronous serial I/O, and on-chip oscillators supporting 10–20 MHz operation - critical for in-vehicle body control and factory automation nodes.
Technical Context
The R5F2123CKFP#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 includes 1 Mbyte address space, fixed interrupt vector table at 0FFDCh–0FFFFh, and dedicated SFR areas for CAN (01300h–0147Fh) and peripheral control.
Peripheral integration centers on deterministic timing: Timer RD (16-bit × 2 channels) supports input capture/output compare; Timer RE provides divided clock output; and the CAN module uses dedicated message buffers with full 2.0B compliance - enabling robust communication without host CPU intervention.
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 addressing |
| Memory | 128 KB program flash + 2×1 KB data flash + 6 KB RAM - enables firmware updates and parameter storage without external EEPROM |
| CAN Interface | Single-channel CAN 2.0B compliant with 16 message slots - supports arbitration, error handling, and automatic retransmission |
| ADC | 10-bit successive approximation ADC with 12 analog inputs - provides precision sensor interfacing for motor control or battery monitoring |
| Timers | Timer RA/RB (8-bit × 2), Timer RD (16-bit × 2 with input capture/output compare), Timer RE (compare match output) |
| Supply Range | 2.7–5.5 V operation - allows direct connection to 3.3 V or 5 V systems without level-shifting |
| Package | 48-pin LQFP (PLQP0048KB-A, 7 mm × 7 mm, 0.5 mm pitch) - compatible with standard surface-mount assembly processes |
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) plus general-purpose CMOS I/O with programmable pull-up |
| P1_0–P1_7 | GPIO / Key Interrupt / Serial | KI0–KI3 key scan inputs; TXD0/RXD0 UART0; CLK0 clock I/O; TRAIO timer I/O |
| P2_0–P2_7 | Timer RD I/O | TRDIOA0–TRDIOD1 and TRDCLK - support quadrature decoding, PWM generation, and capture of high-speed events |
| P3_0, P3_1 | Timer Output | TRAO and TRBO - dedicated outputs for Timer RA and RB waveforms |
| P3_3–P3_5, P3_7 | I²C / SSI / CAN | SDA/SCL (I²C bus), SSI/SCS/SSCK (serial I/O with chip select), SSO (SSI data out), CTX0/CRX0 (CAN transceiver I/O) |
| P4_2 | VREF Input | External reference voltage input for ADC - enables ratiometric or precision measurement configurations |
| P4_6/P4_7 | XIN/XOUT | Crystal/resonator interface for main system clock - supports 10–20 MHz operation with on-chip feedback resistor |
| RESET | Active-Low Reset | Asynchronous reset input - initiates hardware reset sequence including register initialization and vector fetch |
Key Features
| Feature | Design Value |
|---|---|
| Embedded Data Flash | 2×1 KB blocks with 10,000 write/erase cycles - enables field-upgradable calibration data and configuration storage |
| Hardware LIN Module | Integrated LIN 2.0/2.1 support via UART0 and Timer RA - eliminates need for external LIN transceiver in slave-node designs |
| Oscillation Stop Detection | Dedicated circuit monitors XIN clock failure and triggers reset - ensures fail-safe behavior in safety-critical automotive subsystems |
| On-Chip Oscillators | High-speed (adjustable 1–20 MHz) and low-speed (32 kHz) RC oscillators - provide clock redundancy and fast wake-up from stop mode |
| Interrupt Architecture | 7-level priority with 14 internal + 6 external + 4 software sources - supports deterministic real-time response for multi-tasking firmware |
Applications
| Automotive Body Control Unit | Industrial CAN Gateway |
|---|---|
Use Scenario: Centralized control of door locks, window lifts, lighting, and HVAC actuators in passenger vehicles. IC Role / Device Role / Timing Role: Primary MCU executing LIN slave protocols for peripherals and CAN master for inter-module communication. Use Value: Integrated LIN and CAN reduce BOM cost and PCB area; data flash stores vehicle-specific configuration and fault logs. |
Use Scenario: Protocol translation between CAN-based PLCs and RS-485 Modbus field devices in factory automation. IC Role / Device Role / Timing Role: Real-time bridge controller managing message filtering, rate adaptation, and error recovery between networks. Use Value: Dual UARTs and CAN module enable concurrent serial/CAN traffic; 128 KB flash hosts protocol stack and routing logic. |
| Smart Sensor Node | Motor Drive Monitor |
Use Scenario: Environmental sensing node (temperature, humidity, pressure) with CAN telemetry in agricultural machinery. IC Role / Device Role / Timing Role: Sensor interface MCU acquiring analog data, performing local compensation, and transmitting via CAN. Use Value: 12-channel ADC and on-chip voltage reference eliminate external signal conditioning; data flash retains calibration coefficients. |
Use Scenario: Monitoring current, voltage, and temperature in BLDC motor drives for HVAC compressors or pumps. IC Role / Device Role / Timing Role: Safety-monitoring co-processor sampling analog inputs and validating PWM timing against fault thresholds. Use Value: Timer RD input capture measures PWM edge timing; watchdog and oscillation detection enforce safe shutdown on anomaly detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F2123AKFP | 96 KB program flash, same 2×1 KB data flash, identical peripherals and pinout | Suitable where firmware size < 96 KB reduces cost without sacrificing data retention capability | Select when application code footprint fits within 96 KB and budget constraints favor lower-density variant |
| R5F2122CKFP | No data flash (128 KB program flash only); otherwise identical package, peripherals, and speed grade | Applicable where parameter storage is handled externally or not required | Choose when eliminating internal data flash simplifies qualification or meets legacy design continuity requirements |
Compared with R5F2123CKFP#U0, R5F2123AKFP offers reduced program memory at identical data flash and interface capability, while R5F2122CKFP removes data flash entirely - making both viable alternatives depending on firmware size and nonvolatile parameter storage needs.
Availability
R5F2123CKFP#U0 is available at Aetrix Electronics and suitable for automotive body electronics, industrial CAN gateways, smart sensor nodes, and motor drive monitoring requiring stable component supply across extended temperature ranges.
Supply support for R5F2123CKFP#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/23 Group, including R5F2123CKFP#U0, was designed for cost-sensitive, real-time embedded control in automotive body electronics and industrial networking - emphasizing integrated CAN/LIN, flash reliability, and extended temperature operation.
FAQ
What is the maximum operating frequency of the R5F2123CKFP#U0?
The R5F2123CKFP#U0 supports a maximum external crystal frequency of 20 MHz, achieving a 50 ns minimum instruction execution time under 3.0–5.5 V supply conditions. Its on-chip high-speed oscillator is adjustable from 1 MHz to 20 MHz, and the device also integrates a 32 kHz low-speed oscillator for standby timing.
Does the R5F2123CKFP#U0 include hardware CAN and LIN interfaces?
Yes, the R5F2123CKFP#U0 integrates one fully compliant CAN 2.0B module with 16 message buffers and a hardware LIN module implemented using UART0 and Timer RA. This eliminates external transceivers for basic LIN slave functionality and enables robust, low-latency CAN communication without CPU overhead.
What type and capacity of embedded memory does the R5F2123CKFP#U0 provide?
The R5F2123CKFP#U0 contains 128 KB of on-chip program flash memory, 6 KB of RAM, and two independent 1 KB data flash blocks. The data flash supports 10,000 write/erase cycles and is intended for storing calibration data, configuration parameters, or firmware update images - distinct from program flash rated for 1,000 cycles.
What is the operating temperature range for the R5F2123CKFP#U0?
The R5F2123CKFP#U0 is specified for operation from -40°C to +85°C (J version). An optional K version extends the range to -40°C to +125°C. The device includes on-chip voltage detection and oscillation stop detection circuits to ensure reliable behavior across its full rated temperature envelope.
Is the R5F2123CKFP#U0 pin-compatible with other R8C/23 Group MCUs?
Yes, all R8C/23 Group MCUs, including R5F2123CKFP#U0, share the identical 48-pin LQFP (PLQP0048KB-A) package and pin assignment. Memory size variations (e.g., R5F2123AKFP vs. R5F2123CKFP#U0) do not affect pin function mapping, enabling drop-in replacement within the same group for code-size optimization.
R5F2123CKFP#U0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 48-LQFP
- Series:
- R8C/2x/23
- Packaging:
- Tray
- Product Status:
- Not For New Designs
- Programmable:
- 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:
- 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:
R5F2123CKFP#U0 FAQ
1.How can I place an order for R5F2123CKFP#U0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F2123CKFP#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 R5F2123CKFP#U0 reliable?
The price and inventory of R5F2123CKFP#U0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F2123CKFP#U0 is usually 5 days.
3.What payment methods are accepted for R5F2123CKFP#U0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F2123CKFP#U0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F2123CKFP#U0?
R5F2123CKFP#U0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F2123CKFP#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 R5F2123CKFP#U0?
For technical support, including R5F2123CKFP#U0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F2123CKFP#U0 requirements.
6.How does Aetrix verify that R5F2123CKFP#U0 is sourced from the original manufacturer or authorized distributors?
All R5F2123CKFP#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 R5F2123CKFP#U0 meets industry standards.
7.What is the process for return or replacement of R5F2123CKFP#U0?
All R5F2123CKFP#U0 units undergo pre-shipment inspection (PSI). If there is an issue with R5F2123CKFP#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 R5F2123CKFP#U0 part is unused and in its original packaging.
Return procedure for R5F2123CKFP#U0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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