My Inquiry
My Account
Renesas R5F21286KSP#W4
- Part No.:
- R5F21286KSP#W4
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 20-LSSOP (0.173", 4.40mm Width)
- Datasheet:
-
R5F21286KSP#W4.pdf
- Description:
- IC MCU 16BIT 32KB FLASH 20LSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,406
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
R5F21286KSP#W4 from Renesas Electronics is a 16-bit single-chip microcontroller in the R8C/28 Group, featuring 32 KB flash program memory, 1.5 KB RAM, and operation up to 20 MHz at 3.0–5.5 V. It integrates UART0/UART1, I²C bus interface, LIN hardware module, 10-bit 4-channel ADC, four 8-/16-bit timers (RA/RB/RC/RE), and real-time clock functionality - deployed in automotive body control modules requiring extended temperature operation.
For engineers reviewing the R5F21286KSP#W4 datasheet, R5F21286KSP#W4 pinout, R5F21286KSP#W4 application, or R5F21286KSP#W4 equivalent, key selection criteria include its -40°C to +125°C industrial-grade operating range, on-chip voltage detection and power-on reset, 20-pin LSSOP package with verified pin mapping, and support for LIN 2.0-compliant communication via dedicated hardware timer and UART0.
Technical Context
The R5F21286KSP#W4 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 provides 1 Mbyte address space, fixed interrupt vector table at 0FFDCh–0FFFFh, and supports both user ROM and SFR access within defined ranges.
Peripheral integration includes dual UARTs (one shared with LIN), I²C-compatible serial interface, clock-synchronous serial I/O with chip select, and Timer RE configured for real-time clock and compare match - all controlled via dedicated special function registers mapped to 00000h–002FFh.
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 |
| Flash Memory | 32 KB program ROM; supports 1,000 erase/write cycles; VCC = 2.7–5.5 V programming |
| RAM | 1.5 KB on-chip SRAM; used for data storage, subroutine stacks, and interrupt handling |
| Operating Temp | -40°C to +125°C (K version); qualified for under-hood automotive and industrial control environments |
| Supply Voltage | 3.0–5.5 V; includes on-chip voltage detection circuit and power-on reset for stable boot |
| Timers | Timer RA/RB (8-bit ×2), Timer RC (16-bit input capture/output compare), Timer RE (RTC + compare match) |
| Serial Interfaces | UART0 (LIN-capable), UART1, I²C bus interface, clock-synchronous serial I/O with chip select |
| A/D Converter | 10-bit successive-approximation ADC with 4 analog inputs (AN8–AN11) and internal reference support |
Pinout & Package
Package: 20-pin molded-plastic LSSOP (PLSP0020JB-A), 0.65 mm pitch, JEDEC MS-013AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (P3_5) | SCL / TRCIOD / SSCK | I²C clock line; Timer RC channel D I/O; synchronous serial clock - multiplexed, software-selectable |
| 2 (P3_7) | RXD1/(TXD1) / TRAO / SSO | UART1 receive (or transmit if configured); Timer RA output; synchronous serial output - requires mode register setup |
| 3 (RESET) | Reset Input | Active-low asynchronous reset; internal pull-up; triggers hardware reset sequence on falling edge |
| 4 (XOUT/XCOUT/P4_7) | XOUT (XIN oscillator) / XCOUT (XCIN oscillator) / P4_7 | Output for crystal/resonator feedback; XCOUT only active on N/D versions; P4_7 is input-only port |
| 5 (VSS/AVSS) | Digital & Analog Ground | Common ground reference for logic and A/D converter; separate AVSS minimizes noise coupling into ADC |
| 6 (XIN/XCIN/P4_6) | XIN (main clock input) / XCIN (32 kHz RTC clock) / P4_6 | Primary oscillator input; XCIN only enabled on N/D versions; P4_6 is input-only port |
| 7 (VCC/AVCC) | Digital & Analog Supply | 3.0–5.5 V main supply; AVCC powers A/D converter - decoupling capacitor required between AVCC and AVSS |
| 8 (MODE) | Mode Selection | Must be pulled high via external resistor to enable single-chip operation; determines boot mode configuration |
| 9 (P4_5) | INT0 / (RXD1) | External interrupt 0 input; also serves as UART1 receive when INT0 function disabled in peripheral control register |
| 10 (P1_7) | INT1 / TRAIO | External interrupt 1 input; Timer RA I/O pin - supports PWM output or capture input depending on TRAxCR register setting |
| 11 (P1_6) | CLK0 / (SSI) | UART0 clock I/O; also functions as synchronous serial interface clock when SSI mode enabled |
| 12 (P1_5) | RXD0 / (TRAIO) / (INT1) | UART0 receive input; alternate functions require disabling RXD0 in SMR00 register before reassignment |
| 13 (P1_4) | TXD0 | UART0 transmit output; driven by serial shift register; level matches VCC logic threshold |
| 14 (P1_3) | KI3 / TRBO / AN11 | Key interrupt 3 input; Timer RB output; A/D channel 11 analog input - function selected via port mode register |
| 15 (P1_2) | KI2 / TRCIOB / AN10 | Key interrupt 2 input; Timer RC channel B I/O; A/D channel 10 analog input - each function gated by control bits |
| 16 (VREF) | ADC Reference Input | External reference voltage input for A/D converter; internally buffered; overrides internal VCC-based reference |
| 17 (P1_1) | KI1 / TRCIOA/TRCTRG / AN9 | Key interrupt 1 input; Timer RC channel A I/O or external trigger; A/D channel 9 - mutually exclusive per register config |
| 18 (P1_0) | KI0 / AN8 | Key interrupt 0 input; A/D channel 8 analog input; no alternate digital I/O function on this pin |
| 19 (P3_3) | INT3 / TRCCLK / SSI | External interrupt 3 input; Timer RC clock input; synchronous serial interface data I/O - function selected by SIR register |
| 20 (P3_4) | SDA / TRCIOC / SCS | I²C data line; Timer RC channel C I/O; synchronous serial chip select - software-configurable per peripheral enable bit |
Key Features
| Feature | Design Value |
|---|---|
| Hardware LIN Module | Integrated LIN 2.0 physical layer support using Timer RA and UART0 - eliminates external transceiver for basic node implementation |
| Real-Time Clock (RTC) | Timer RE provides autonomous RTC with compare match; operates from 32 kHz XCIN source (N/D versions only) or internal oscillator |
| On-Chip Voltage Detection | Detects VCC drop below programmable threshold (e.g., 4.3 V or 3.8 V); triggers reset or interrupt without external supervisor IC |
| Low-Power Stop Mode | 0.7 µA typical current at 3.0 V in stop mode - enables battery-backed applications with wake-on-interrupt capability |
| Programmable LED Drive Ports | P1_0–P1_7 support direct LED drive (N/D versions); configurable sink current up to 20 mA per pin with thermal protection |
| Flash Programming Support | On-chip flash allows in-system programming via UART0; no external programmer required for field firmware updates |
Applications
| Automotive Body Control Unit | Industrial Sensor Node |
|---|---|
|
Use Scenario: Centralized control of door locks, window lifts, mirror adjustment, and interior lighting in passenger vehicles. IC Role / Device Role / Timing Role: Primary MCU executing LIN slave protocol, managing GPIO-driven actuators, and sampling analog sensor signals (e.g., ambient light, temperature). Use Value: -40°C to +125°C rating ensures reliability in engine bay proximity; integrated LIN hardware reduces BOM cost and PCB footprint versus discrete transceiver solutions. |
Use Scenario: Remote environmental monitoring node with analog sensor inputs (temperature, humidity) and wireless backhaul via UART-to-LoRa bridge. IC Role / Device Role / Timing Role: Data acquisition controller performing 10-bit ADC conversions, timestamping readings via Timer RE RTC, and formatting packets for serial transmission. Use Value: 0.7 µA stop-mode current extends battery life to multi-year operation; on-chip voltage detection prevents brownout-induced data corruption during power transitions. |
| Home Appliance Motor Control | Office Equipment Power Management |
|
Use Scenario: Fan speed regulation and thermal protection in HVAC systems and air purifiers using PWM-driven BLDC motors. IC Role / Device Role / Timing Role: Real-time motor commutation controller generating precise PWM outputs via Timer RA/RB and reading back EMF via ADC channels. Use Value: 50 ns instruction timing enables sub-microsecond PWM resolution; 1.5 KB RAM accommodates PID coefficient tables and runtime variables without external memory. |
Use Scenario: Standby power sequencing and status reporting in multifunction printers and copiers with multiple voltage rails and sleep/wake states. IC Role / Device Role / Timing Role: System supervisor managing power rail sequencing, monitoring supply voltages via ADC, and asserting reset signals to companion ICs. Use Value: Integrated power-on reset and voltage detection eliminate need for discrete supervisors; MODE pin configuration simplifies factory programming of boot behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F21286JSP | Same core, memory, and peripherals but rated for -40°C to +85°C; lacks K-version high-temp qualification | Suitable for cabin-mounted automotive modules or industrial panels not exposed to under-hood temperatures | Select R5F21286JSP where ambient temperature remains ≤85°C and cost sensitivity outweighs extended thermal margin |
| R5F21296KSP | Adds 2×1 KB data flash blocks; otherwise identical package, pinout, and peripheral set | Required when field-upgradable parameter storage (e.g., calibration data, device IDs) must survive power loss | Choose R5F21296KSP if nonvolatile data retention beyond program ROM is needed - no PCB change required |
Compared with R5F21286KSP#W4, R5F21286JSP offers lower thermal qualification at reduced cost, while R5F21296KSP adds data flash without altering footprint or software compatibility - enabling scalable firmware architecture across product variants.
Availability
R5F21286KSP#W4 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and office equipment power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for R5F21286KSP#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 specializing in microcontrollers, analog, and power solutions for automotive, industrial, and IoT applications.
The R8C/28 Group, including R5F21286KSP#W4, was designed for cost-sensitive, thermally demanding embedded control applications requiring integrated peripherals, low-power operation, and automotive-grade reliability without full 32-bit complexity.
FAQ
What is the maximum operating frequency and supply voltage range for R5F21286KSP#W4?
R5F21286KSP#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 qualification (-40°C to +125°C) applies across this full voltage range, ensuring timing compliance in high-temperature automotive environments where voltage regulation may vary.
Does R5F21286KSP#W4 include on-chip debug support?
Yes, R5F21286KSP#W4 supports on-chip debugging via the single-wire background debug mode (BDM) interface using the RESET pin. This enables full breakpoint, step-through, and register inspection capabilities without requiring additional debug pins - critical for space-constrained automotive PCB layouts where R5F21286KSP#W4 is commonly deployed.
Can R5F21286KSP#W4 generate LIN-compliant waveforms without external components?
Yes, R5F21286KSP#W4 integrates a hardware LIN module combining Timer RA and UART0 to generate ISO 9141-2/LIN 2.0-compliant baud rates, synchronization fields, and checksums. While an external LIN transceiver is still required for bus-level signal conditioning, R5F21286KSP#W4 handles all protocol-layer timing and framing - reducing firmware overhead and improving timing accuracy versus bit-banged implementations.
What are the ADC reference options available on R5F21286KSP#W4?
R5F21286KSP#W4 supports two ADC reference sources: the internal VCC supply (default) and an external voltage applied to the VREF pin. Using VREF allows precise, noise-immune conversion independent of VCC fluctuations - essential for accurate sensor measurements in electrically noisy automotive environments where R5F21286KSP#W4 is frequently used.
Is the R5F21286KSP#W4 pin-compatible with other R8C/28 Group devices?
Yes, R5F21286KSP#W4 shares the identical 20-pin LSSOP (PLSP0020JB-A) package and pinout with all R8C/28 Group members, including R5F21284KSP and R5F21282KSP. Memory size and peripheral enablement differ by part number, but PCB layout, power delivery, and signal routing remain fully interchangeable - enabling scalable design reuse across performance tiers within the same platform.
R5F21286KSP#W4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 20-LSSOP (0.173", 4.40mm Width)
- Series:
- R8C/2x/28
- Packaging:
- Tray
- 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:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 1.5K 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:
R5F21286KSP#W4 FAQ
1.How can I place an order for R5F21286KSP#W4 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F21286KSP#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 R5F21286KSP#W4 reliable?
The price and inventory of R5F21286KSP#W4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21286KSP#W4 is usually 5 days.
3.What payment methods are accepted for R5F21286KSP#W4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21286KSP#W4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F21286KSP#W4?
R5F21286KSP#W4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F21286KSP#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 R5F21286KSP#W4?
For technical support, including R5F21286KSP#W4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21286KSP#W4 requirements.
6.How does Aetrix verify that R5F21286KSP#W4 is sourced from the original manufacturer or authorized distributors?
All R5F21286KSP#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 R5F21286KSP#W4 meets industry standards.
7.What is the process for return or replacement of R5F21286KSP#W4?
All R5F21286KSP#W4 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21286KSP#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 R5F21286KSP#W4 part is unused and in its original packaging.
Return procedure for R5F21286KSP#W4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R5F21286KSP#W4 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…
