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Renesas R5F21294KSP#U0
- Part No.:
- R5F21294KSP#U0
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 20-LSSOP (0.173", 4.40mm Width)
- Datasheet:
-
R5F21294KSP#U0.pdf
- Description:
- IC MCU 16BIT 16KB FLASH 20LSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,500
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Product details
Overview
R5F21294KSP from Renesas Electronics is a 16-bit R8C/29 Group single-chip microcontroller with 16 KB program flash, 2 KB on-chip data flash (1 KB × 2 blocks), 1 KB RAM, and operation up to 20 MHz at 3.0–5.5 V. It integrates UART0/UART1, I²C, LIN, 10-bit 4-channel ADC, four 8/16-bit timers, and real-time clock functionality. It targets automotive body electronics and industrial control systems requiring extended temperature operation.
For engineers reviewing the R5F21294KSP datasheet, R5F21294KSP pinout, R5F21294KSP application, or R5F21294KSP equivalent, key selection criteria include its -40°C to +125°C operating range, dual-block data flash for firmware/data logging, hardware LIN support via Timer RA and UART0, and LSSOP-20 package compatibility with space-constrained automotive modules.
Technical Context
The R5F21294KSP implements the R8C CPU core with 89 fundamental instructions and executes at 50 ns minimum instruction time (20 MHz, VCC = 3.0–5.5 V). Its memory architecture separates 16 KB program ROM (flash) from 2 KB dedicated data flash-enabling independent erase/rewrite cycles without disrupting code execution.
Peripheral integration includes UART0 supporting clock-synchronous serial I/O and UART modes, UART1 for asynchronous communication, hardware LIN transceiver logic tied to Timer RA and UART0, and Timer RE providing real-time clock with compare match (K version supports compare match only, not full RTC oscillator).
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 address space |
| Memory | 16 KB program flash + 2 KB data flash (1 KB × 2 blocks) + 1 KB RAM - enables firmware updates and nonvolatile parameter storage |
| Operating Temp | -40°C to +125°C (K version) - qualified for under-hood automotive applications |
| Supply Voltage | 3.0 V to 5.5 V - compatible with standard 5 V and regulated 3.3 V automotive power rails |
| Timers | Timer RA/RB (8-bit × 2), Timer RC (16-bit input capture/output compare), Timer RE (real-time clock compare match) |
| Serial Interfaces | UART0 (clock-sync + UART), UART1 (UART only), I²C bus interface, LIN module (hardware-assisted) |
| A/D Converter | 10-bit resolution, 4-channel SAR ADC - suitable for sensor signal acquisition in motor control and climate systems |
Pinout & Package
Package: 20-pin molded-plastic LSSOP (PLSP0020JB-A), 0.65 mm pitch, surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1_0 / KI0 / AN8 | Key interrupt input / analog input | Supports wake-up from stop mode via external key press; accepts 0–VREF analog voltage for sensor monitoring |
| P1_4 / TXD0 | UART0 transmit output | Drives RS-232/RS-485 level-shifted signals or direct TTL-level communication with peripherals |
| P3_4 / SDA / SCS / TRCIOC | I²C data / chip select / timer input capture | Multi-function pin enabling shared I²C bus access, SPI-like peripheral selection, or edge-triggered timing capture |
| P3_5 / SCL / SSCK / TRCIOD | I²C clock / serial clock / timer output compare | Provides synchronous clocking for I²C slaves, external shift registers, or PWM waveform generation |
| RESET | Active-low reset input | Asynchronous hard reset; internal pull-up ensures reliable startup after power-on or brownout recovery |
| XIN / XCIN | Crystal/resonator input (XIN); 32 kHz crystal input (XCIN, N/D only) | R5F21294KSP uses XIN only - supports 20 MHz ceramic resonator or crystal for main system clock |
Key Features
| Feature | Design Value |
|---|---|
| Hardware LIN Module | Integrated LIN 2.1/2.2 protocol engine using Timer RA and UART0 - eliminates external LIN transceiver for basic node implementation |
| Data Flash Architecture | Dual 1 KB blocks enable background erase/write while executing code from program flash - critical for over-the-air firmware updates |
| Low-Power Modes | Stop mode draws 0.7 µA (VCC = 3.0 V); wait mode draws 2.0 µA with 32 kHz sub-clock active - extends battery life in always-on modules |
| On-Chip Oscillators | High-speed on-chip oscillator with frequency adjustment + XIN circuit - reduces BOM cost and board area vs. external crystal |
| Extended Temperature Range | K-version qualification (-40°C to +125°C) meets AEC-Q100 Grade 2 requirements for automotive cabin and engine bay use |
Applications
| Automotive Body Control Module | Industrial Motor Drive Interface |
|---|---|
Use Scenario: Centralized control of door locks, window lifts, mirror adjusters, and interior lighting in passenger vehicles. IC Role / Device Role / Timing Role: Primary MCU managing LIN slave communications, analog sensor inputs (potentiometers, temp), and PWM-driven LED drivers. Use Value: Hardware LIN support reduces software overhead and timing jitter; data flash stores user preferences and fault logs across power cycles. |
Use Scenario: Local intelligence for BLDC motor controllers in HVAC blowers, pumps, and fans. IC Role / Device Role / Timing Role: Sensor fusion hub acquiring current/voltage/temperature data and generating commutation timing via Timer RC PWM outputs. Use Value: 10-bit 4-channel ADC enables simultaneous sampling; 20 MHz CPU handles real-time FOC calculations within tight loop deadlines. |
| Smart Appliance Control Unit | Automotive Climate Control Panel |
Use Scenario: User interface and subsystem coordination in washing machines, dishwashers, and refrigerators. IC Role / Device Role / Timing Role: Manages key scan matrix, display backlight PWM, relay drivers, and serial communication with main controller. Use Value: Key interrupt pins (KI0–KI3) enable low-power wake-on-press; 16 KB flash accommodates feature-rich UI firmware. |
Use Scenario: Cabin temperature regulation panel with rotary encoder, ambient sensor, and CAN/LIN gateway functions. IC Role / Device Role / Timing Role: Front-end processor handling HMI, local sensor reading, and LIN messaging to HVAC actuator nodes. Use Value: Dual data flash blocks allow safe field updates of calibration tables without interrupting climate control logic. |
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 |
|---|---|---|---|
| R5F21294SDSP | D version: -40°C to +85°C, same memory/peripherals but no extended high-temp qualification | Suitable for cabin-mounted modules where ambient temperature stays below 85°C | Select when cost sensitivity outweighs under-hood thermal requirements |
| RL78/F12 R5F10PLG | RL78 core, 32 KB flash, 4 KB RAM, integrated debug interface, lower active current (120 µA/MHz) | Better suited for new designs requiring higher code density, ultra-low-power sleep, or enhanced debugging | Choose for next-generation platforms prioritizing energy efficiency and toolchain maturity |
Compared with R5F21294KSP, the R5F21294SDSP offers identical functionality at lower temperature grade and cost, while the RL78/F12 provides architectural modernization, larger memory, and superior power efficiency - making it preferable for greenfield designs despite migration effort.
Availability
R5F21294KSP is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor interfaces, and smart appliance control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for R5F21294KSP 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/29 Group, including R5F21294KSP, was designed for cost-sensitive, thermally demanding embedded control applications requiring robust peripheral integration and long-term automotive-grade reliability.
FAQ
What is the maximum operating frequency and supply voltage range for the R5F21294KSP?
The R5F21294KSP operates at up to 20 MHz with a supply voltage range of 3.0 V to 5.5 V. Its minimum instruction execution time is 50 ns under these conditions. The K version is specifically rated for this voltage range across its full -40°C to +125°C operating temperature envelope, ensuring timing stability in harsh environments.
Does the R5F21294KSP include on-chip data flash, and how is it structured?
Yes, the R5F21294KSP includes 2 KB of on-chip data flash organized as two independent 1 KB blocks. This structure allows one block to be erased and rewritten while the other remains active for data retention - essential for robust firmware update and parameter logging implementations without halting program execution.
Is hardware LIN support available on the R5F21294KSP, and how is it implemented?
Yes, the R5F21294KSP integrates a hardware LIN module that combines Timer RA and UART0 to implement LIN 2.1/2.2 protocol framing and checksum generation. This offloads LIN communication tasks from the CPU, improves timing accuracy, and reduces software complexity compared to bit-banged implementations.
What package type and pin count does the R5F21294KSP use?
The R5F21294KSP is housed in a 20-pin molded-plastic LSSOP package (type PLSP0020JB-A) with 0.65 mm lead pitch. This compact surface-mount package supports automated assembly and provides sufficient I/O for mid-complexity automotive and industrial control applications.
How does the R5F21294KSP handle reset and clock sources?
The R5F21294KSP features an active-low RESET pin with internal pull-up, a dedicated XIN/XOUT crystal/resonator interface for main system clock, and on-chip high-speed/low-speed oscillators. It does not support the XCIN/XCOUT 32 kHz crystal option - that function is excluded in K versions per Renesas documentation.
R5F21294KSP#U0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 20-LSSOP (0.173", 4.40mm Width)
- Series:
- R8C/2x/29
- 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:
- LED, POR, Voltage Detect, WDT
- Number of I/O:
- 13
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 1K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- A/D 4x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F21294KSP#U0 FAQ
1.How can I place an order for R5F21294KSP#U0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F21294KSP#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 R5F21294KSP#U0 reliable?
The price and inventory of R5F21294KSP#U0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21294KSP#U0 is usually 5 days.
3.What payment methods are accepted for R5F21294KSP#U0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21294KSP#U0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F21294KSP#U0?
R5F21294KSP#U0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F21294KSP#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 R5F21294KSP#U0?
For technical support, including R5F21294KSP#U0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21294KSP#U0 requirements.
6.How does Aetrix verify that R5F21294KSP#U0 is sourced from the original manufacturer or authorized distributors?
All R5F21294KSP#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 R5F21294KSP#U0 meets industry standards.
7.What is the process for return or replacement of R5F21294KSP#U0?
All R5F21294KSP#U0 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21294KSP#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 R5F21294KSP#U0 part is unused and in its original packaging.
Return procedure for R5F21294KSP#U0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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