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Renesas R5F21282SDSP#U0
- Part No.:
- R5F21282SDSP#U0
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 20-LSSOP (0.173", 4.40mm Width)
- Datasheet:
-
R5F21282SDSP#U0.pdf
- Description:
- IC MCU 16BIT 8KB FLASH 20LSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,487
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Product details
Overview
R5F21282SDSP#U0 from Renesas Electronics is a 16-bit single-chip microcontroller (MCU) based on the R8C CPU core, packaged in a 20-pin LSSOP (PLSP0020JB-A). It integrates 8 KB flash program memory, 512 bytes RAM, a 10-bit 4-channel ADC, UART0/UART1, I²C bus interface, hardware LIN module, and timers RA/RB/RC/RE. It operates across -40°C to +85°C and targets embedded control in consumer and industrial equipment.
For engineers reviewing the R5F21282SDSP#U0 datasheet, R5F21282SDSP#U0 pinout, R5F21282SDSP#U0 application, or R5F21282SDSP#U0 equivalent, key selection criteria include its D-version temperature grade (-40°C to +85°C), absence of on-chip data flash (distinguishing it from R8C/29 Group), 20-pin LSSOP package with verified pin functions including TRCIOA/TRCIOB for PWM and SDA/SCL for I²C, and compatibility with low-voltage operation down to 2.2 V at 5 MHz.
Technical Context
The R5F21282SDSP#U0 implements the R8C 16-bit CISC 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, with program ROM mapped from 0C000h–0FFFFh and RAM from 00400h–005FFh.
Peripheral integration includes Timer RC (16-bit with input capture/output compare), Timer RE (real-time clock with compare match), dual UARTs, clock-synchronous serial I/O, and hardware LIN using Timer RA and UART0. The MCU supports three clock sources: external XIN/XOUT (up to 20 MHz), high-speed on-chip oscillator (adjustable), and XCIN/XCOUT (32 kHz, D-version enabled).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C 16-bit CISC with 89 instructions; enables compact code and deterministic timing for real-time control loops. |
| Flash Memory | 8 KB program ROM; sufficient for mid-complexity firmware with bootloader and application logic in single-chip deployment. |
| RAM | 512 bytes; supports stack, variables, and small buffers for UART/LIN communication without external memory. |
| A/D Converter | 10-bit, 4-channel; suitable for sensor monitoring (e.g., thermistors, potentiometers) with ±1 LSB INL and typical 1.8 µs conversion time. |
| Operating Voltage | 2.2 V to 5.5 V; allows direct interface with 3.3 V or 5 V logic domains and battery-powered operation down to 2.2 V at reduced frequency. |
| Temperature Range | -40°C to +85°C (D version); qualified for industrial environments including motor drives and HVAC controls. |
| Package | 20-pin LSSOP (PLSP0020JB-A); surface-mount compatible with standard reflow profiles and 0.65 mm pitch for compact PCB layout. |
Pinout & Package
Package: 20-pin molded-plastic LSSOP (PLSP0020JB-A), 0.65 mm lead pitch, 7.6 mm × 4.4 mm body size, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1_0 / KI0 / AN8 | Multi-function I/O | Configurable as key interrupt input, analog input channel 8, or general-purpose CMOS I/O with software-selectable pull-up. |
| P3_4 / SDA / SCS / TRCIOC | I²C Data / Chip Select / Timer RC I/O | Shared pin supports I²C bidirectional data transfer, SPI chip select, or PWM/output compare on Timer RC channel C. |
| XIN / XCIN | Crystal/External Clock Input | Dual-role input: accepts 20 MHz crystal for main system clock or 32 kHz crystal for RTC (enabled in D version). |
| RESET | Active-low Reset Input | Asynchronous reset assertion halts CPU, clears registers, and restarts execution from vector 0FFDCh; requires external pull-up. |
| VREF | Analog Reference Input | Accepts external reference voltage (up to VCC) for A/D converter, enabling precise ratiometric or absolute measurements. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware LIN Module | Full LIN 2.0/2.1 protocol support via dedicated UART0 + Timer RA; eliminates software bit-banging and ensures timing compliance. |
| Real-Time Clock (Timer RE) | Integrated RTC with calendar mode and compare match; enables wake-up from stop mode and timestamping without external components. |
| Low-Power Stop Mode | 0.7 µA typical current at 3.0 V; extends battery life in intermittently active applications such as remote sensors or smart switches. |
| On-Chip Oscillation Stop Detection | Monitors XIN clock stability and triggers reset or interrupt if oscillation fails; critical for fail-safe operation in automotive subsystems. |
| LED Drive Ports (P1_0–P1_7) | Direct-drive capability (sink/source up to 20 mA per pin) for 8 LEDs; reduces BOM count in user-interface designs like appliance panels. |
Applications
| Home Appliance Control | Industrial Sensor Node |
|---|---|
Use Scenario: Microcontroller in washing machine main board managing motor control, water level sensing, and user interface. IC Role / Device Role / Timing Role: Central real-time controller executing PID loops, sampling ADC channels (AN8–AN11), and driving display LEDs via P1_0–P1_7. Use Value: Integrated UART0 and LIN enable communication with inverter modules; 8 KB flash accommodates field-upgradable firmware with safety checks. | Use Scenario: Standalone environmental monitor logging temperature/humidity and transmitting data over UART to gateway. IC Role / Device Role / Timing Role: Low-power data acquisition node using Timer RE for periodic wake-up, ADC for sensor reads, and UART1 for burst transmission. Use Value: 0.7 µA stop-mode current and -40°C to +85°C rating ensure multi-year battery operation in unconditioned industrial enclosures. |
| Automotive Body Control | Office Equipment Peripheral |
Use Scenario: Door module controlling window lift, mirror adjustment, and interior lighting in passenger vehicles. IC Role / Device Role / Timing Role: LIN slave node interfacing with central body controller via hardware LIN module (UART0 + Timer RA), managing local PWM outputs. Use Value: Pin-compatible with other R8C/28 devices simplifies variant management; built-in voltage detection prevents brown-out during load dump events. | Use Scenario: Embedded controller in multifunction printer managing paper feed, toner sensing, and panel buttons. IC Role / Device Role / Timing Role: Host processor handling key interrupts (KI0–KI3), UART0 for host PC communication, and I²C for EEPROM configuration storage. Use Value: 13 GPIO pins + 3 dedicated inputs provide ample I/O for mechanical switches, solenoids, and status LEDs without external expanders. |
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 | 16 KB flash, 1 KB RAM; identical peripheral set and D-version temperature grade. | Supports larger firmware images (e.g., USB HID stack, enhanced diagnostics) without external memory expansion. | Select when firmware growth exceeds 8 KB or additional RAM is needed for communication buffers. |
| R5F21292SDSP | R8C/29 Group part with 1 KB × 2 data flash blocks; same 8 KB program ROM and D-version rating. | Enables field-updatable calibration data or secure keys stored in data flash, inaccessible to program ROM erasure cycles. | Select when non-volatile parameter storage with 10,000 write endurance is required alongside program execution. |
Compared with R5F21282SDSP#U0, R5F21284SDSP offers double flash/RAM for complex applications, while R5F21292SDSP adds dedicated data flash for configuration retention-both retain identical pinout, peripherals, and industrial temperature range.
Availability
R5F21282SDSP#U0 is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, and automotive body electronics requiring stable component supply across extended product lifecycles.
Supply support for R5F21282SDSP#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 industrial, automotive, and enterprise applications.
The R8C/28 Group, including R5F21282SDSP#U0, was designed for cost-sensitive, low-power embedded control in consumer and industrial equipment where reliability, integrated peripherals, and long-term supply stability are essential.
FAQ
What is the maximum operating frequency of the R5F21282SDSP#U0?
The R5F21282SDSP#U0 achieves a minimum instruction execution time of 50 ns when operating at 20 MHz with VCC = 3.0–5.5 V. This corresponds to a maximum system clock frequency of 20 MHz using an external crystal on the XIN/XOUT pins. The on-chip high-speed oscillator supports adjustable frequencies but is rated for lower precision than the crystal-based clock path.
Does the R5F21282SDSP#U0 include on-chip data flash memory?
No, the R5F21282SDSP#U0 belongs to the R8C/28 Group and contains only 8 KB of program flash memory. It does not include the 1 KB × 2 data flash blocks found in R8C/29 Group devices like R5F21292SDSP. Data retention must be implemented externally or via EEPROM emulation in program flash.
Which communication interfaces are supported by the R5F21282SDSP#U0?
The R5F21282SDSP#U0 supports UART0 (with clock-synchronous serial I/O capability), UART1, I²C bus interface, clock-synchronous serial I/O with chip select (SSI), and a hardware LIN module that uses UART0 and Timer RA. It does not support SPI, CAN, or USB interfaces.
What is the function of the XCIN/XCOUT pins on the R5F21282SDSP#U0?
The XCIN and XCOUT pins on the R5F21282SDSP#U0 support a 32 kHz crystal for the real-time clock (Timer RE) and are functional only in N- and D-version devices. They are not present in J/K versions. When used, this crystal enables accurate timekeeping and low-power wake-up from stop mode independent of the main XIN clock.
How many analog input channels does the R5F21282SDSP#U0 ADC support?
The R5F21282SDSP#U0 integrates a single 10-bit successive-approximation ADC with four analog input channels: AN8, AN9, AN10, and AN11. These map to P1_0, P1_1, P1_2, and P1_3 respectively and support programmable sampling time and trigger sources including timer overflows and software commands.
R5F21282SDSP#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:
- 20MHz
- Connectivity:
- I2C, LINbus, SIO, SSU, UART/USART
- Peripherals:
- LED, POR, Voltage Detect, WDT
- Number of I/O:
- 13
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 512 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.2V ~ 5.5V
- Data Converters:
- A/D 4x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F21282SDSP#U0 FAQ
1.How can I place an order for R5F21282SDSP#U0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F21282SDSP#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 R5F21282SDSP#U0 reliable?
The price and inventory of R5F21282SDSP#U0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21282SDSP#U0 is usually 5 days.
3.What payment methods are accepted for R5F21282SDSP#U0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21282SDSP#U0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F21282SDSP#U0?
R5F21282SDSP#U0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F21282SDSP#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 R5F21282SDSP#U0?
For technical support, including R5F21282SDSP#U0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21282SDSP#U0 requirements.
6.How does Aetrix verify that R5F21282SDSP#U0 is sourced from the original manufacturer or authorized distributors?
All R5F21282SDSP#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 R5F21282SDSP#U0 meets industry standards.
7.What is the process for return or replacement of R5F21282SDSP#U0?
All R5F21282SDSP#U0 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21282SDSP#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 R5F21282SDSP#U0 part is unused and in its original packaging.
Return procedure for R5F21282SDSP#U0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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