My Inquiry
My Account
Renesas R5F2123CJFP#U0
- Part No.:
- R5F2123CJFP#U0
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
R5F2123CJFP#U0.pdf
- Description:
- IC MCU 16BIT 128KB FLASH 48LFQFP
- Quantity:
- Payment:
- Shipping:
Inventory:179
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
R5F2123CJFP#U0 from Renesas Electronics is a 16-bit R8C/23 Group microcontroller with CAN 2.0B interface, 128 KB flash program memory, 6 KB RAM, and embedded 2 KB data flash (1 KB × 2 blocks), operating at up to 20 MHz in automotive and industrial control applications.
For engineers reviewing the R5F2123CJFP#U0 datasheet, R5F2123CJFP#U0 pinout, R5F2123CJFP#U0 application, or R5F2123CJFP#U0 equivalent, this MCU delivers deterministic real-time control with integrated LIN, UART, I²C, 12-channel 10-bit ADC, and dual 16-bit timers - critical for in-vehicle networking and factory automation systems requiring robust communication and mixed-signal processing.
Technical Context
The R5F2123CJFP#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). It integrates a dedicated CAN 2.0B module with 16 message slots, hardware LIN support via Timer RA and UART0, and dual UART channels for concurrent serial communication.
Its memory architecture includes 1 Mbyte address space, on-chip high-speed/low-speed oscillators with frequency adjustment, and voltage detection with power-on reset - all configured for single-chip operation across -40°C to +85°C ambient temperature range in LQFP-48 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C 16-bit CISC core with 89 instructions and register bank switching |
| Max Clock Frequency | 20 MHz (XIN input); supports 10 MHz and 16 MHz variants via version coding |
| 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 |
| Analog Peripherals | 12-channel 10-bit A/D converter with VREF input; on-chip voltage detection and POR |
| Communication Interfaces | 1× CAN 2.0B (16-slot), 2× UART, 1× I²C bus, 1× LIN (hardware-assisted), 1× clock-sync serial I/O with chip select |
| Timers | Timer RA/RB (8-bit ×2), Timer RD (16-bit ×2 with input capture/output compare), Timer RE (8-bit compare match) |
Pinout & Package
Package: 48-pin plastic LQFP (PLQP0048KB-A), 7 mm × 7 mm body, 0.5 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0_0–P0_7 | Analog Input / I/O Port | 12-channel A/D converter inputs (AN0–AN7) and general-purpose CMOS I/O with programmable pull-up |
| P1_0–P1_7 | Key Input / Serial I/O | KI0–KI3 key interrupt inputs; UART0 TXD0/RXD0; CLK0 transfer clock I/O |
| P2_0–P2_7 | Timer RD I/O | TRDIOA0–TRDIOD1 and TRDCLK for 16-bit timer input capture/output compare functions |
| P3_0, P3_1, P3_3–P3_7 | I²C / Synchronous Serial | SDA/SCS/SCL/SSCK/SSI/SSO for I²C and clock-sync serial I/O with chip select |
| P4_2, P4_3, P4_4, P4_5, P4_6, P4_7 | VREF / Interrupt / XIN/XOUT | VREF reference input; INT0 interrupt; XIN clock input; XOUT clock output; MODE and RESET control |
| P6_0–P6_7 | CAN / UART1 / Timer RE | CTX0/CRX0 CAN transceiver pins; TXD1/RXD1 UART1; TREO divided clock output; INT2/INT3 interrupts |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CAN 2.0B Module | Dedicated 16-slot message buffer enables deterministic in-vehicle network node timing without CPU overhead |
| Data Flash Memory | 2 KB (1 KB × 2 blocks) with 10,000 erase/write cycles supports field firmware updates and parameter storage |
| Hardware LIN Support | Timer RA and UART0 combined to implement LIN 2.0 physical layer without software bit-banging |
| 12-Channel 10-Bit ADC | Simultaneous sampling not supported, but configurable trigger sources (timer, external interrupt) enable precise sensor acquisition |
| Low-Power Oscillator Options | On-chip high-speed oscillator (adjustable) and low-speed oscillator reduce BOM count and improve startup reliability |
Applications
| Automotive Body Control Module | Industrial PLC I/O Subsystem |
|---|---|
Use Scenario: Centralized control of door locks, window lifts, lighting, and mirror adjustment in passenger vehicles. IC Role / Device Role / Timing Role: Primary MCU executing LIN slave protocol over UART0/Timer RA while managing CAN gateway functions and analog sensor inputs. Use Value: Eliminates need for discrete LIN transceivers and reduces system latency through hardware-accelerated protocol handling. |
Use Scenario: Remote I/O expansion unit communicating with main PLC controller via CAN bus in factory automation. IC Role / Device Role / Timing Role: CAN 2.0B endpoint with 16-slot message buffering, 12-channel ADC for analog sensor monitoring, and UART for configuration debugging. Use Value: Enables deterministic response to CAN commands within 50 µs and supports hot-swappable I/O modules via standardized message slots. |
| Smart HVAC Controller | Medical Diagnostic Equipment Interface |
Use Scenario: Embedded controller for commercial HVAC units managing temperature sensors, fan speed, and valve actuation. IC Role / Device Role / Timing Role: Real-time sensor acquisition (10-bit ADC on AN0–AN11), PWM generation via Timer RD, and local display communication via I²C. Use Value: On-chip voltage detection and power-on reset ensure reliable boot under fluctuating 24 VDC supply conditions common in HVAC environments. |
Use Scenario: Signal conditioning and communication interface between analog medical sensors (ECG, SpO₂) and host processor in diagnostic devices. IC Role / Device Role / Timing Role: Isolated analog front-end controller with 10-bit ADC, watchdog timer, and UART/USB bridge (via external transceiver). Use Value: Data flash storage retains calibration coefficients and device-specific parameters across power cycles without external EEPROM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F2123AJFP | 96 KB program ROM, same 2 KB data flash, identical peripheral set and pinout | Lower code density requirement; suitable for less complex firmware with smaller memory footprint | Select when application firmware fits within 96 KB and cost optimization is prioritized without sacrificing data flash or peripherals |
| R5F2123CKFP | Same 128 KB ROM and 2 KB data flash, but rated for -40°C to +125°C ambient operation | Required for under-hood automotive or high-temperature industrial enclosures where extended thermal range is mandatory | Choose when operating environment exceeds +85°C and full industrial temperature grade compliance is required |
Compared with R5F2123CJFP#U0, R5F2123AJFP offers reduced program memory at lower cost for simpler control tasks, while R5F2123CKFP provides identical functionality with extended temperature qualification - enabling drop-in replacement only when thermal requirements justify the grade upgrade.
Availability
R5F2123CJFP#U0 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC subsystems, smart HVAC controllers, and medical diagnostic equipment interfaces requiring stable component supply and long-term lifecycle support.
Supply support for R5F2123CJFP#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 R5F2123CJFP#U0, was designed for cost-sensitive, real-time embedded control in automotive networking and industrial automation - emphasizing integrated CAN/LIN, data flash, and mixed-signal capability in compact LQFP packages.
FAQ
What is the maximum operating frequency and supply voltage range for the R5F2123CJFP#U0?
The R5F2123CJFP#U0 operates at a maximum frequency of 20 MHz with supply voltage ranging from 3.0 V to 5.5 V. This specification applies to the J-version (–40°C to +85°C ambient), and the device maintains 50 ns minimum instruction execution time under these conditions. The high-speed on-chip oscillator supports frequency adjustment, and an external crystal or ceramic resonator may be used via XIN/XOUT pins.
Does the R5F2123CJFP#U0 include on-chip data flash memory, and what is its endurance?
Yes, the R5F2123CJFP#U0 includes 2 KB of on-chip data flash memory organized as two 1 KB blocks. Its specified endurance is 10,000 write/erase cycles, distinct from the 1,000-cycle endurance of the main program ROM. This data flash is allocated at addresses 02400h–02BFFh and is intended for nonvolatile parameter storage and field firmware updates.
How many CAN message buffers does the R5F2123CJFP#U0 support, and what CAN standard is implemented?
The R5F2123CJFP#U0 implements a single CAN module compliant with ISO 11898-1:2003 (CAN 2.0B), supporting up to 16 independent message buffers. Each buffer can be configured for transmission or reception, with programmable acceptance filtering and automatic retransmission. The module uses dedicated pins CTX0 (output) and CRX0 (input) and requires no external transceiver for basic functional verification.
What analog-to-digital capabilities does the R5F2123CJFP#U0 provide?
The R5F2123CJFP#U0 integrates a 10-bit successive-approximation A/D converter with 12 input channels (AN0–AN11), selectable reference voltage (VREF pin), and multiple trigger sources including internal timers and external interrupts. Conversion time is 16 µs per sample at 20 MHz operation, and the ADC supports both single-shot and continuous scan modes with result storage in dedicated registers.
Is the R5F2123CJFP#U0 pin-compatible with other members of the R8C/23 Group?
Yes, the R5F2123CJFP#U0 shares identical pin assignment and electrical characteristics with all R8C/23 Group variants in the 48-pin LQFP package (PLQP0048KB-A), including R5F21236JFP through R5F2123AKFP. Differences are limited to ROM size, data flash presence, and temperature grade - allowing PCB reuse across firmware variants and performance tiers within the same package footprint.
R5F2123CJFP#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:
- 20MHz
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F2123CJFP#U0 FAQ
1.How can I place an order for R5F2123CJFP#U0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F2123CJFP#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 R5F2123CJFP#U0 reliable?
The price and inventory of R5F2123CJFP#U0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F2123CJFP#U0 is usually 5 days.
3.What payment methods are accepted for R5F2123CJFP#U0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F2123CJFP#U0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F2123CJFP#U0?
R5F2123CJFP#U0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F2123CJFP#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 R5F2123CJFP#U0?
For technical support, including R5F2123CJFP#U0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F2123CJFP#U0 requirements.
6.How does Aetrix verify that R5F2123CJFP#U0 is sourced from the original manufacturer or authorized distributors?
All R5F2123CJFP#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 R5F2123CJFP#U0 meets industry standards.
7.What is the process for return or replacement of R5F2123CJFP#U0?
All R5F2123CJFP#U0 units undergo pre-shipment inspection (PSI). If there is an issue with R5F2123CJFP#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 R5F2123CJFP#U0 part is unused and in its original packaging.
Return procedure for R5F2123CJFP#U0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R5F2123CJFP#U0 Tags
-
ATTINY4-TSHR
Microchip Technology
-
ATTINY10-TSHR
Microchip Technology
-
ATTINY10-TS8R
Microchip Technology
-
ATTINY202-SSNR
Microchip Technology
-
ATTINY202-SSFR
Microchip Technology
-
ATTINY402-SSNR
Microchip Technology
-
PIC16F15213T-I/MF
Microchip Technology
-
PIC16F15213-E/MF
Microchip Technology
-
PIC10F200T-I/OT
Microchip Technology
-
ATTINY412-SSNR
Microchip Technology
-
PIC10F202T-I/OT
Microchip Technology
-
ATTINY404-SSNR
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
