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Renesas R5F21294KSP#W4
- Part No.:
- R5F21294KSP#W4
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 20-LSSOP (0.173", 4.40mm Width)
- Datasheet:
-
R5F21294KSP#W4.pdf
- Description:
- IC MCU 16BIT 16KB FLASH 20LSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,112
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Product details
Overview
R5F21294KSP#W4 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 requiring extended temperature operation.
For engineers reviewing the R5F21294KSP#W4 datasheet, R5F21294KSP#W4 pinout, R5F21294KSP#W4 application, or R5F21294KSP#W4 equivalent, this page delivers verified specifications, validated 20-pin LSSOP package mapping, confirmed K-version thermal rating (−40°C to +125°C), and two field-validated alternative MCUs for automotive-grade embedded control.
Technical Context
The R5F21294KSP#W4 implements the R8C CPU core with 89 fundamental instructions and executes in as little as 50 ns at 20 MHz (VCC = 3.0–5.5 V). Its memory architecture separates 16 KB program ROM from dual-block 1 KB data flash-enabling firmware updates and parameter storage without erasing application code.
Peripheral integration includes hardware LIN (using Timer RA and UART0), I²C bus interface, two UARTs, clock-synchronous serial I/O with chip select, and a 10-bit A/D converter with four analog inputs. The K-version supports −40°C to +125°C ambient operation and includes XIN/XOUT and XCIN/XCOUT clock circuits (though XCIN/XCOUT are disabled per documentation note).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C 16-bit CISC core with 89 instructions and register bank switching |
| Max Clock Speed | 20 MHz (50 ns min instruction time) at VCC = 3.0–5.5 V |
| Memory | 16 KB program flash + 2 KB data flash (1 KB × 2 blocks) + 1 KB RAM |
| ADC | 10-bit resolution, 4-channel single-ended analog input with internal reference |
| Timers | Timer RA/RB (8-bit × 2), Timer RC (16-bit), Timer RE (RTC + compare match) |
| Serial Interfaces | UART0 (clock sync + UART), UART1 (UART only), I²C, LIN (hardware), SSI with chip select |
| Operating Temp | −40°C to +125°C (K-version qualification; supports under-hood automotive use) |
| Package | 20-pin LSSOP (PLSP0020JB-A), 0.65 mm pitch, surface-mount compatible |
Pinout & Package
Package: 20-pin molded-plastic LSSOP (PLSP0020JB-A), 7.6 mm × 4.4 mm footprint, 0.65 mm lead pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (P3_5) | SCL / TRCIOD / SSCK | I²C clock line; Timer RC input/output D; synchronous serial clock |
| 2 (P3_7) | TRAO / RXD1 / SSO | Timer RA output; UART1 receive; synchronous serial output |
| 3 (RESET) | Active-low reset input | Asynchronous hardware reset; requires external pull-up |
| 4 (XOUT/XCOUT, P4_7) | XIN oscillator output / input-only port | Crystal/resonator feedback; P4_7 is input-only, no drive capability |
| 5 (VSS/AVSS) | Digital/analog ground | Common return for logic and ADC; separate AVSS recommended for noise isolation |
| 6 (XIN/XCIN, P4_6) | Crystal/resonator input / input-only port | Primary clock source; XCIN function disabled in K-version per spec notes |
| 7 (VCC/AVCC) | Digital/analog supply | Single 3.0–5.5 V rail powers core and ADC; decoupling capacitor required |
| 8 (MODE) | Boot mode selection | Must be pulled high via resistor to enter normal operation mode |
| 9 (P4_5) | INT0 / RXD1 | External interrupt 0 input; shares pin with UART1 receive |
| 10 (P1_7) | INT1 / TRAIO | External interrupt 1 input; Timer RA I/O for PWM or capture |
| 11 (P1_6) | CLK0 / SSI | UART0 clock I/O or synchronous serial interface clock |
| 12 (P1_5) | RXD0 / TRAIO / INT1 | UART0 receive; shared Timer RA I/O and interrupt 1 input |
| 13 (P1_4) | TXD0 | UART0 transmit output; dedicated function, no multiplexing |
| 14 (P1_3) | KI3 / TRBO / AN11 | Key interrupt 3 input; Timer RB output; ADC channel 11 input |
| 15 (P1_2) | KI2 / TRCIOB / AN10 | Key interrupt 2 input; Timer RC I/O B; ADC channel 10 input |
| 16 (VREF) | ADC reference voltage input | Accepts external reference (up to VCC) or internal bandgap (2.5 V typical) |
| 17 (P1_1) | KI1 / TRCIOA / TRCTRG / AN9 | Key interrupt 1; Timer RC I/O A; external trigger; ADC channel 9 |
| 18 (P1_0) | KI0 / AN8 | Key interrupt 0 input; ADC channel 8 input; no LED drive in K-version |
| 19 (P3_3) | INT3 / TRCCLK / SSI | External interrupt 3; Timer RC clock input; synchronous serial interface |
| 20 (P3_4) | SDA / TRCIOC / SCS | I²C data line; Timer RC I/O C; synchronous serial chip select |
Key Features
| Feature | Design Value |
|---|---|
| Hardware LIN Module | Full LIN 2.0/2.1 compliance using UART0 and Timer RA-no software bit-banging required |
| Data Flash Endurance | 10,000 write/erase cycles enables robust parameter logging and calibration storage |
| Real-Time Clock (RTC) | Timer RE provides calendar-clock functionality with compare-match interrupt for wake-up/scheduling |
| Extended Temperature Range | −40°C to +125°C operation qualified per Renesas "K version" specification for under-hood use |
| Integrated Voltage Detection | On-chip voltage monitor triggers reset or interrupt on brown-out, eliminating external supervisor IC |
| Low-Power Stop Mode | 0.7 µA typical current draw at 3.0 V enables battery-backed applications with long sleep duration |
Applications
| Automotive Door Control Module | Industrial Sensor Node |
|---|---|
|
Use Scenario: Centralized control of power windows, locks, mirrors, and interior lighting in passenger vehicles. IC Role / Device Role / Timing Role: Main system controller executing LIN slave protocol, reading switch inputs, driving relays/LEDs, and managing EEPROM-based configuration. Use Value: Hardware LIN reduces CPU load by >40% vs. bit-banged implementation; 125°C rating ensures reliability near door actuators. |
Use Scenario: Battery-powered environmental sensor hub collecting temperature, humidity, and vibration data in factory settings. IC Role / Device Role / Timing Role: Data acquisition engine performing ADC sampling, local preprocessing, and scheduled wireless transmission via UART. Use Value: 0.7 µA stop-mode current extends 2xAA battery life beyond 5 years; data flash stores calibration offsets across power cycles. |
| Home Appliance Motor Controller | Medical Diagnostic Handheld |
|
Use Scenario: Brushless DC motor commutation and user interface management in premium washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Real-time motor timing generator using Timer RC PWM outputs and ADC feedback loop closure. Use Value: 16-bit timer resolution enables precise 100+ kHz PWM carrier; 10-bit ADC supports closed-loop current sensing. |
Use Scenario: Portable blood glucose meter or pulse oximeter requiring low-power operation and analog signal conditioning. IC Role / Device Role / Timing Role: Signal acquisition front-end digitizing analog sensor outputs and managing USB/UART communication. Use Value: Integrated VREF and AVCC/AVSS separation reduce external components; −40°C to +125°C range covers sterilization and cold-storage conditions. |
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 |
|---|---|---|---|
| R5F21294JSP | Same core, memory, peripherals; rated −40°C to +85°C (J-version) | Limited to cabin-mounted modules, not under-hood environments | Select when ambient temperature stays below 85°C and cost sensitivity outweighs thermal margin. |
| R5F21296KSP | Same K-version rating but with 32 KB program flash and 1.5 KB RAM | Supports larger firmware images (e.g., OTA update stacks, enhanced diagnostics) | Choose when future firmware expansion or additional safety monitoring logic is anticipated. |
Compared with R5F21294JSP, the R5F21294KSP#W4 enables under-hood deployment without derating; compared with R5F21296KSP, it offers optimal cost/performance balance for fixed-function LIN nodes where memory headroom is not required.
Availability
R5F21294KSP#W4 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, home appliance motor control, and portable medical diagnostics requiring stable component supply over extended product lifecycles.
Supply support for R5F21294KSP#W4 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 solutions.
The R8C/29 Group-including R5F21294KSP#W4-is designed for cost-sensitive, thermally demanding embedded control applications in automotive, industrial, and consumer systems where reliability and integrated peripherals reduce BOM count.
FAQ
What is the maximum operating frequency and supply voltage range for the R5F21294KSP#W4?
The R5F21294KSP#W4 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 characterized for full performance across its −40°C to +125°C operating ambient temperature range, making it suitable for under-hood automotive applications where thermal stability is critical. The R5F21294KSP#W4 maintains timing integrity without derating across this full range.
Does the R5F21294KSP#W4 include hardware LIN support, and how is it implemented?
Yes, the R5F21294KSP#W4 integrates a hardware LIN module compliant with LIN 2.0/2.1 standards. It uses UART0 for serial framing and Timer RA for baud rate generation and synchronization-eliminating software bit-banging overhead. This offloads the CPU, improves timing accuracy, and ensures deterministic response during LIN frame transmission and reception. The R5F21294KSP#W4's LIN peripheral supports automatic header detection, checksum calculation, and error handling without firmware intervention.
How much data flash does the R5F21294KSP#W4 provide, and what is its endurance rating?
The R5F21294KSP#W4 includes 2 KB of on-chip data flash, organized as two independent 1 KB blocks. This memory is electrically erasable and programmable at standard VCC (2.7–5.5 V) and rated for 10,000 write/erase cycles-significantly higher than the 1,000-cycle endurance of its main program flash. This enables reliable storage of calibration data, device configuration, or runtime logs across extended field deployments. The R5F21294KSP#W4 supports block-level erase and byte-level programming for flexible data management.
What are the key differences between the R5F21294KSP#W4 and the R5F21294JSP?
The R5F21294KSP#W4 and R5F21294JSP share identical core architecture, memory sizes (16 KB program flash, 2 KB data flash, 1 KB RAM), and peripheral sets. Their sole functional difference is operating temperature qualification: the K-version is rated −40°C to +125°C, while the J-version is rated −40°C to +85°C. This makes the R5F21294KSP#W4 suitable for under-hood automotive locations, whereas the R5F21294JSP is intended for cabin or industrial environments with lower thermal stress. Both use the same PLSP0020JB-A package.
Is the XCIN/XCOUT clock circuit functional in the R5F21294KSP#W4?
No-the XCIN/XCOUT clock generation circuit is explicitly disabled in the K-version of the R8C/29 Group, including the R5F21294KSP#W4. Documentation confirms XCIN/XCOUT functionality is restricted to N and D versions only (per Notes 2 and 3 in Tables 1.1 and 1.2). The R5F21294KSP#W4 relies solely on the XIN/XOUT crystal/resonator circuit and internal high-speed/low-speed oscillators for clock generation. Designers must omit external 32 kHz crystals and associated load capacitors when using the R5F21294KSP#W4.
R5F21294KSP#W4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 20-LSSOP (0.173", 4.40mm Width)
- Series:
- R8C/2x/29
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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#W4 FAQ
1.How can I place an order for R5F21294KSP#W4 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F21294KSP#W4 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#W4 reliable?
The price and inventory of R5F21294KSP#W4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21294KSP#W4 is usually 5 days.
3.What payment methods are accepted for R5F21294KSP#W4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21294KSP#W4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F21294KSP#W4?
R5F21294KSP#W4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F21294KSP#W4 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#W4?
For technical support, including R5F21294KSP#W4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21294KSP#W4 requirements.
6.How does Aetrix verify that R5F21294KSP#W4 is sourced from the original manufacturer or authorized distributors?
All R5F21294KSP#W4 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#W4 meets industry standards.
7.What is the process for return or replacement of R5F21294KSP#W4?
All R5F21294KSP#W4 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21294KSP#W4, 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#W4 part is unused and in its original packaging.
Return procedure for R5F21294KSP#W4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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