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Renesas R5F21284KSP#U0
- Part No.:
- R5F21284KSP#U0
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 20-LSSOP (0.173", 4.40mm Width)
- Datasheet:
-
R5F21284KSP#U0.pdf
- Description:
- IC MCU 16BIT 16KB FLASH 20LSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,437
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Product details
Overview
R5F21284KSP#U0 from Renesas Electronics is a 16-bit single-chip microcontroller in the R8C/28 Group, featuring an R8C CPU core, 16 KB flash program memory, 1 KB RAM, and operating across -40°C to +125°C. It integrates UART0/UART1, I²C bus interface, LIN module, 10-bit 4-channel ADC, three 8-bit timers (RA/RB), one 16-bit timer (RC), real-time clock-capable Timer RE, and on-chip oscillators. It targets automotive body electronics and industrial control where extended temperature operation is required.
For engineers reviewing the R5F21284KSP#U0 datasheet, R5F21284KSP#U0 pinout, R5F21284KSP#U0 application, or R5F21284KSP#U0 equivalent, key selection considerations include its K-version industrial-automotive temperature grade (-40°C to +125°C), absence of data flash (R8C/28 Group), 20-pin LSSOP package with confirmed pin functions including TRCIOA/TRCIOB for PWM and input capture, and compatibility with LIN physical layer via UART0 and Timer RA.
Technical Context
The R5F21284KSP#U0 implements the R8C CPU core with 89 fundamental instructions and executes at 50 ns minimum instruction time (20 MHz XIN, VCC = 3.0–5.5 V). Its memory map allocates 16 KB program ROM from 0C000h–0FFFFh and 1 KB RAM from 00400h–007FFh within a 1 Mbyte address space.
Peripheral integration includes dual UARTs (UART0 supports LIN hardware protocol with Timer RA), I²C bus interface, 10-bit 4-channel ADC with AN8–AN11 inputs, and four independent timer modules (RA/RB/RC/RE) supporting input capture, output compare, PWM, and real-time clock functions-though RTC functionality in Timer RE is limited to compare match only in K-version devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C 16-bit CISC core with 89 instructions and register bank switching |
| Program Memory | 16 KB on-chip flash ROM; supports 1,000 erase/write cycles; no data flash (R8C/28 Group) |
| RAM Size | 1 KB internal SRAM mapped at 00400h–007FFh for variables, stack, and subroutine use |
| Operating Temp | -40°C to +125°C (K version); qualified for under-hood automotive and high-temp industrial environments |
| Supply Voltage | 2.7 V to 5.5 V; supports wide-input operation with on-chip voltage detection and power-on reset |
| Package | 20-pin molded-plastic LSSOP (PLSP0020JB-A); 0.65 mm pitch; surface-mount compatible |
| Peripherals | UART0 (LIN-capable), UART1, I²C, 10-bit 4-channel ADC, Timer RA/RB/RC/RE, watchdog timer |
Pinout & Package
Package: 20-pin LSSOP (PLSP0020JB-A), 0.65 mm lead pitch, exposed pad not present, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1_0 / KI0 / AN8 | Multi-function I/O | Key interrupt input, analog input channel 0, general-purpose CMOS I/O with programmable pull-up |
| P1_1 / KI1 / AN9 / TRCIOA / TRCTRG | Multi-function I/O | Key interrupt, analog input 1, PWM/output compare/input capture A, external trigger input |
| P1_2 / KI2 / AN10 / TRCIOB | Multi-function I/O | Key interrupt, analog input 2, PWM/output compare/input capture B |
| P1_3 / KI3 / AN11 / TRBO | Multi-function I/O | Key interrupt, analog input 3, Timer RB output |
| P1_4 / TXD0 | UART0 transmit | Asynchronous serial output for primary UART; used with Timer RA for LIN bus timing |
| P1_5 / RXD0 / (TRAIO) / (INT1) | UART0 receive | Asynchronous serial input; optionally configurable as Timer RA I/O or external interrupt source |
| P1_6 / CLK0 / (SSI) | Clock I/O | Primary system clock I/O; supports synchronous serial interface when configured as SSI |
| P1_7 / TRAIO / INT1 | Timer RA I/O | Programmable I/O for Timer RA output compare or input capture; also serves as external interrupt 1 |
| P3_3 / INT3 / TRCCLK / SSI | External clock input | Provides external clock source for Timer RC; doubles as SSI data line in synchronous mode |
| P3_4 / SDA / SCS / TRCIOC | I²C data / chip select | Open-drain bidirectional I²C data line; also functions as chip-select for synchronous serial I/O |
| P3_5 / SCL / SSCK / TRCIOD | I²C clock / sync clock | I²C clock line; also provides synchronous serial clock or Timer RC input D |
| P3_7 / TRAO / RXD1 / (TXD1) | Timer RA output | Primary Timer RA output; also serves as UART1 receive; optionally configurable as UART1 transmit |
| P4_2 / VREF | Analog reference | Input for A/D converter reference voltage; requires external decoupling capacitor |
| P4_5 / INT0 / (RXD1) | External interrupt 0 | Dedicated interrupt input; shares pin with UART1 receive in alternate function mode |
| XIN / XCIN / P4_6 | Crystal oscillator input | Primary crystal/resonator input for main system clock; XCIN function disabled in K version |
| XOUT / XCOUT / P4_7 | Crystal oscillator output | Output for crystal/resonator feedback; XCOUT function disabled in K version |
| RESET | Active-low reset | Asynchronous reset input; must be held low ≥100 ns to initiate hardware reset sequence |
| MODE | Boot mode select | Must be pulled high via resistor to enable normal operation; determines boot vector location |
| VCC / AVCC | Power supply | Digital and analog supply pins; AVCC requires separate decoupling for ADC noise immunity |
| VSS / AVSS | Ground | Digital and analog ground; recommended to connect at single point near MCU for mixed-signal integrity |
Key Features
| Feature | Design Value |
|---|---|
| LIN Hardware Support | Integrated LIN protocol timing via UART0 and Timer RA eliminates need for external LIN transceiver timing logic |
| Extended Temperature Range | K-version qualification (-40°C to +125°C) enables deployment in engine compartments and industrial enclosures without derating |
| Low-Power Operation | 0.7 µA stop-mode current (VCC = 3.0 V) supports battery-backed applications requiring multi-year standby life |
| Flexible Clock System | Three clock sources: external crystal (XIN/XOUT), high-speed on-chip oscillator (adjustable), and low-speed on-chip oscillator |
| Robust Peripheral Set | Four independent timers with input capture, output compare, and PWM; 10-bit ADC with dedicated analog supply pins |
Applications
| Automotive Body Control Module | Industrial Motor Drive Interface |
|---|---|
Use Scenario: Centralized control of door locks, window lifts, mirror adjustment, and interior lighting in passenger vehicles. IC Role / Device Role / Timing Role: Main controller executing LIN slave node firmware, managing sensor inputs (key interrupts, potentiometers), driving actuators via PWM outputs (TRCIOA/TRCIOB), and communicating over LIN bus using UART0+Timer RA. Use Value: K-version temperature rating ensures reliable operation near vehicle cabin HVAC ducts; integrated LIN hardware reduces BOM count and timing validation effort. | Use Scenario: Closed-loop speed and position control of BLDC motors in factory automation conveyors and packaging machinery. IC Role / Device Role / Timing Role: Real-time motor commutation controller using Timer RC input capture for encoder feedback, Timer RA/B for three-phase PWM generation, and UART1 for host HMI communication. Use Value: 16-bit precision timers with input capture provide sub-microsecond encoder edge resolution; 1 KB RAM accommodates PID coefficient tables and motion profiles. |
| Smart Appliance Power Management | Heating System Thermostat Controller |
Use Scenario: Energy-efficient power sequencing and load monitoring in premium washing machines and dishwashers. IC Role / Device Role / Timing Role: System supervisor monitoring AC line voltage via ADC channels (AN8–AN11), controlling triac drivers via GPIO, logging energy usage in RAM, and reporting status via I²C to display MCU. Use Value: On-chip voltage detection and power-on reset ensure safe startup after brown-out events; 16 KB flash stores multiple appliance cycle algorithms and calibration data. | Use Scenario: Precision ambient and surface temperature regulation in commercial HVAC systems with frost protection and anti-legionella cycles. IC Role / Device Role / Timing Role: Primary temperature controller reading NTC sensors via 10-bit ADC (AN8–AN11), generating PWM fan speed signals (TRCIOA/TRCIOB), and maintaining real-time calendar via Timer RE compare match. Use Value: K-version thermal stability maintains ±0.5°C measurement accuracy across full operating range; integrated watchdog prevents runaway heating conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F21284SDSP | D-version (-40°C to +85°C); same 16 KB ROM/1 KB RAM; lacks K-version high-temp qualification | Suitable for under-dash automotive modules or industrial panels with active cooling | Select when ambient temperature remains ≤85°C and cost sensitivity outweighs extended thermal margin |
| R5F21294KSP | R8C/29 Group variant with 1 KB × 2 data flash; identical K-version temp grade and peripherals | Required when field-upgradable parameter storage (e.g., calibration offsets, device IDs) is needed | Choose when non-volatile data retention between power cycles is mandatory and 10,000-cycle endurance is acceptable |
Compared with R5F21284KSP#U0, the R5F21284SDSP offers lower-cost operation within standard automotive temperature limits, while the R5F21294KSP adds data flash for configuration storage-neither is pin-compatible nor drop-in; both require PCB layout verification due to identical PLSP0020JB-A package but distinct memory mapping and fuse settings.
Availability
R5F21284KSP#U0 is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor drives, smart appliance power management, and HVAC thermostat controllers requiring stable component supply across extended temperature ranges.
Supply support for R5F21284KSP#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 solutions.
The R8C/28 Group, including R5F21284KSP#U0, was designed for cost-sensitive, thermally demanding embedded applications in automotive and industrial markets where 16-bit performance, LIN support, and extended temperature operation are critical.
FAQ
What is the maximum operating frequency supported by R5F21284KSP#U0?
The R5F21284KSP#U0 supports a maximum external crystal frequency of 20 MHz, achieving a minimum instruction execution time of 50 ns at VCC = 3.0–5.5 V. Its high-speed on-chip oscillator is adjustable but does not exceed the 20 MHz XIN limit. The K-version specification confirms this frequency is valid across the full -40°C to +125°C operating range, making R5F21284KSP#U0 suitable for timing-critical automotive subsystems.
Does R5F21284KSP#U0 include data flash memory?
No, R5F21284KSP#U0 belongs to the R8C/28 Group, which contains only program flash memory (16 KB) and no dedicated data flash. Data storage must be implemented in RAM with backup power or external EEPROM. In contrast, R8C/29 Group parts like R5F21294KSP integrate 1 KB × 2 data flash. This distinction is explicitly defined in Renesas documentation, and R5F21284KSP#U0's memory configuration is fixed per its product family assignment.
Which pins on R5F21284KSP#U0 support PWM output?
R5F21284KSP#U0 supports PWM generation on TRCIOA (P1_1), TRCIOB (P1_2), TRCIOC (P3_4), and TRCIOD (P3_5)-all four channels of Timer RC's output-compare function. These pins are configurable as open-drain or CMOS outputs and support variable-duty-cycle waveforms up to the timer's maximum frequency. TRAO (P3_7) and TRBO (P1_3) provide additional PWM-capable outputs from Timer RA and RB respectively, confirmed in the Pin Functions table of the official datasheet.
Can R5F21284KSP#U0 operate with a 3.3 V supply?
Yes, R5F21284KSP#U0 operates with VCC = 2.7 V to 5.5 V, fully supporting 3.3 V nominal supply. At 3.0 V, it achieves 10 MHz operation (100 ns min. instruction time) and 6 mA typical active current. All peripherals-including the 10-bit ADC, UARTs, and I²C interface-function correctly at 3.3 V, and the on-chip voltage detector maintains reset assertion during brown-out conditions down to 2.5 V.
Is the XCIN/XCOUT function available on R5F21284KSP#U0?
No, the XCIN/XCOUT 32 kHz crystal oscillator function is disabled in the K version of the R8C/28 Group, including R5F21284KSP#U0. This is explicitly noted in Tables 1.1 and 1.5 of the datasheet, which state "XCIN, XCOUT can be used only for N or D version." Real-time clock functionality must therefore rely on Timer RE's compare match capability driven by the main XIN oscillator or on-chip low-speed oscillator, not a 32 kHz external crystal.
R5F21284KSP#U0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 20-LSSOP (0.173", 4.40mm Width)
- Series:
- R8C/2x/28
- Packaging:
- Tube
- 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:
- -
- 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:
R5F21284KSP#U0 FAQ
1.How can I place an order for R5F21284KSP#U0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F21284KSP#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 R5F21284KSP#U0 reliable?
The price and inventory of R5F21284KSP#U0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21284KSP#U0 is usually 5 days.
3.What payment methods are accepted for R5F21284KSP#U0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21284KSP#U0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F21284KSP#U0?
R5F21284KSP#U0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F21284KSP#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 R5F21284KSP#U0?
For technical support, including R5F21284KSP#U0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21284KSP#U0 requirements.
6.How does Aetrix verify that R5F21284KSP#U0 is sourced from the original manufacturer or authorized distributors?
All R5F21284KSP#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 R5F21284KSP#U0 meets industry standards.
7.What is the process for return or replacement of R5F21284KSP#U0?
All R5F21284KSP#U0 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21284KSP#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 R5F21284KSP#U0 part is unused and in its original packaging.
Return procedure for R5F21284KSP#U0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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