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Renesas R5F21284SDSP#W4
- Part No.:
- R5F21284SDSP#W4
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 20-LSSOP (0.173", 4.40mm Width)
- Datasheet:
-
R5F21284SDSP#W4.pdf
- Description:
- IC MCU 16BIT 16KB FLASH 20LSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,845
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Product details
Overview
R5F21284SDSP#W4 from Renesas Electronics is a 16-bit R8C/28 Group single-chip microcontroller with 16 KB flash program memory, 1 KB RAM, and 13 I/O pins in a 20-pin LSSOP package. It features an 89-instruction R8C CPU core, 10-bit 4-channel ADC, UART0/UART1 serial interfaces, hardware LIN module, and operates from 2.2 V to 5.5 V across -40°C to +85°C ambient temperature.
For engineers reviewing the R5F21284SDSP#W4 datasheet, R5F21284SDSP#W4 pinout, R5F21284SDSP#W4 application, or R5F21284SDSP#W4 equivalent, this MCU is selected for cost-sensitive embedded control where integrated LIN, low-power stop mode (0.7 µA), and on-chip oscillators reduce BOM count in appliance motor control, industrial sensor nodes, and automotive body electronics.
Technical Context
The R5F21284SDSP#W4 implements the R8C CPU core with two register banks, 20-bit program counter, and 11-bit flag register supporting interrupt priority levels 0–7. Its memory map allocates 16 KB program ROM from 0C000h–0FFFFh and 1 KB RAM from 00400h–007FFh, with fixed interrupt vectors at 0FFDCh–0FFFFh.
Peripheral integration includes Timer RA/RB (8-bit ×2), Timer RC (16-bit), Timer RE (real-time clock capable), I²C bus interface, clock-synchronous serial I/O with chip select, and hardware LIN using Timer RA and UART0 - all controlled via dedicated SFRs mapped to 00000h–002FFh.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C 16-bit CISC core with 89 instructions and register bank switching |
| Flash Memory | 16 KB program ROM; supports 1,000 erase/write cycles; VCC = 2.7–5.5 V programming |
| RAM | 1 KB internal SRAM used for data storage, subroutine stacks, and interrupt handling |
| ADC | 10-bit successive-approximation A/D converter with 4 input channels (AN8–AN11) |
| Timers | Timer RA/RB (8-bit ×2 w/ prescaler), Timer RC (16-bit w/ input capture/output compare), Timer RE (RTC + compare match) |
| Serial Interfaces | UART0 (clock sync + UART), UART1 (UART only), I²C bus, clock-sync serial I/O w/ chip select, hardware LIN (1 channel) |
| Supply & Temp | VCC = 2.2–5.5 V; operating ambient: –40°C to +85°C (D version); stop mode current = 0.7 µA @ 3.0 V |
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 | Multi-function I/O port | Key interrupt input, analog input channel 0, LED drive (D version) |
| P1_1 / KI1 / AN9 / TRCIOA / TRCTRG | Multi-function I/O port | Key interrupt input, analog input channel 1, timer RC input-capture A or trigger |
| P1_2 / KI2 / AN10 / TRCIOB | Multi-function I/O port | Key interrupt input, analog input channel 2, timer RC input-capture B |
| P1_3 / KI3 / AN11 / TRBO | Multi-function I/O port | Key interrupt input, analog input channel 3, timer RB output |
| P1_4 / TXD0 | UART0 transmit output | Asynchronous serial data output for primary UART interface |
| P1_5 / RXD0 / (TRAIO) / (INT1) | UART0 receive input | Asynchronous serial data input; optionally configured as timer RA I/O or INT1 |
| P1_6 / CLK0 / (SSI) | Clock I/O | UART0/UART1 clock source or clock signal for synchronous serial interface |
| P1_7 / TRAIO / INT1 | Timer RA I/O | Timer RA input/output pin; also serves as external interrupt source INT1 |
| P3_3 / INT3 / TRCCLK / SSI | External timer clock input | Provides external clock to Timer RC; also supports synchronous serial I/O and INT3 |
| P3_4 / SDA / SCS / TRCIOC | I²C data / chip select / timer RC I/O | Open-drain bidirectional I²C data line; chip-select for synchronous serial; timer RC input-capture C |
| P3_5 / SCL / SSCK / TRCIOD | I²C clock / sync clock / timer RC I/O | I²C clock line; synchronous serial clock; timer RC input-capture D |
| P3_7 / TRAO / RXD1 / (TXD1) | Timer RA output / UART1 receive | Timer RA output signal; UART1 receive input; optionally configured as UART1 transmit |
| P4_2 / VREF | Analog reference input | External reference voltage input for 10-bit ADC conversion accuracy |
| P4_5 / INT0 / (RXD1) | External interrupt / UART1 receive | Level-sensitive external interrupt input; optionally assigned as UART1 receive |
| P4_6 / XIN / XCIN | Crystal oscillator input | Primary system clock input (XIN) or 32 kHz real-time clock input (XCIN, D version only) |
| P4_7 / XOUT / XCOUT | Crystal oscillator output | Oscillator feedback output; supports 32 kHz crystal for RTC when XCIN/XCOUT enabled |
| RESET | Active-low reset input | Hardware reset assertion; must be held low ≥100 ns to initiate reset sequence |
| MODE | Boot mode selection | Connected to VCC via pull-up resistor to enable normal operation mode |
| VCC / AVCC | Power supply | Digital and analog power supply (2.2–5.5 V); separate AVCC/AVSS required for ADC noise immunity |
| VSS / AVSS | Ground | Digital and analog ground; decoupling capacitor required between AVCC and AVSS |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Hardware LIN | Full LIN 2.0/2.1 protocol support via dedicated module using Timer RA and UART0 - eliminates external transceiver in body control modules |
| Low-Power Stop Mode | 0.7 µA typical current at 3.0 V enables battery-powered sensor nodes with multi-year runtime |
| On-Chip Oscillators | High-speed (adjustable 1–20 MHz) and low-speed (32 kHz) on-chip oscillators eliminate external crystals in cost-sensitive designs |
| Real-Time Clock (RTC) | Timer RE provides calendar/timekeeping with compare match; powered by XCIN/XCOUT (32 kHz) in D version |
| LED Drive Capability | 8 I/O pins (P1_0–P1_7) support direct LED sinking up to 20 mA per pin - reduces external driver IC count in HMI applications |
Applications
| Home Appliance Motor Control | Automotive Body Electronics |
|---|---|
Use Scenario: Variable-speed fan control in air purifiers and HVAC units using PWM-driven BLDC motors. IC Role / Device Role / Timing Role: Main system controller executing motor commutation logic, reading hall sensors, and managing user interface via key interrupts. Use Value: Integrated 16-bit Timer RC with input capture enables precise rotor position sensing; 10-bit ADC monitors current feedback without external amplifiers. | Use Scenario: Smart door lock module with LIN communication to central body controller and local keypad sensing. IC Role / Device Role / Timing Role: LIN node controller handling secure authentication, actuator drive, and tamper detection via key inputs and GPIO monitoring. Use Value: Hardware LIN module ensures deterministic timing and protocol compliance; 0.7 µA stop mode extends battery life during standby. |
| Industrial Sensor Node | Office Equipment Power Management |
Use Scenario: Wireless temperature/humidity sensor node with local display and battery backup. IC Role / Device Role / Timing Role: Data acquisition controller sampling analog sensors, driving 7-segment LED display, and managing sleep/wake cycles. Use Value: On-chip 32 kHz oscillator powers RTC and wake timers; 4-channel 10-bit ADC digitizes sensor outputs with internal reference. | Use Scenario: Standby power controller in multifunction printers that monitors USB activity and triggers main power rail activation. IC Role / Device Role / Timing Role: Low-power supervisor monitoring host signals and controlling DC-DC enable lines via GPIO. Use Value: VCC range down to 2.2 V allows operation during brown-out conditions; 13 GPIOs manage multiple power domains and status LEDs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F21284SNSP | N version: –20°C to +85°C operating range; no XCIN/XCOUT RTC support; same 16 KB flash/1 KB RAM | Suitable for indoor consumer appliances without extended temperature or RTC requirements | Select R5F21284SNSP when ambient temperature stays above –20°C and real-time clock functionality is unnecessary. |
| R5F21294SDSP | R8C/29 Group: adds 2×1 KB data flash (10,000-cycle endurance); identical pinout, peripherals, and D-version temp grade | Required for field-upgradable calibration data or parameter storage needing frequent rewrites | Choose R5F21294SDSP if nonvolatile data logging or firmware patching in the field is needed - retains full software compatibility. |
Compared with R5F21284SNSP, the R5F21284SDSP#W4 offers extended temperature range and RTC capability; compared with R5F21294SDSP, it lacks data flash but reduces cost and simplifies firmware update architecture for static-parameter applications.
Availability
R5F21284SDSP#W4 is available at Aetrix Electronics and suitable for home appliance motor control, automotive body electronics, and industrial sensor node designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for R5F21284SDSP#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/28 Group, including R5F21284SDSP#W4, was designed for cost-optimized 16-bit embedded control in appliances, industrial equipment, and automotive sub-systems where integration, low power, and reliability are critical.
FAQ
What is the maximum operating frequency of the R5F21284SDSP#W4?
The R5F21284SDSP#W4 achieves a minimum instruction execution time of 50 ns at 20 MHz system clock (VCC = 3.0–5.5 V), corresponding to a maximum operating frequency of 20 MHz. This is supported by the high-speed on-chip oscillator or external crystal connected to XIN/XOUT pins.
Does the R5F21284SDSP#W4 include a real-time clock (RTC)?
Yes, the R5F21284SDSP#W4 includes RTC functionality via Timer RE, enabled in the D version using the XCIN/XCOUT 32 kHz crystal oscillator circuit. The RTC supports real-time counting and compare match events for alarm or periodic wake-up operations.
What are the key differences between R5F21284SDSP#W4 and R5F21294SDSP?
The R5F21284SDSP#W4 belongs to the R8C/28 Group and has 16 KB program flash only, while R5F21294SDSP is in the R8C/29 Group and adds 2×1 KB data flash with 10,000 write/erase cycles. All other peripherals, pinout, and D-version temperature rating (–40°C to +85°C) are identical.
Can the R5F21284SDSP#W4 drive LEDs directly?
Yes, the R5F21284SDSP#W4 supports direct LED drive on P1_0 through P1_7 (8 pins), rated for up to 20 mA sink current per pin in the D version. This eliminates external LED drivers in simple HMI applications like status indicators or numeric displays.
Is hardware LIN support built into the R5F21284SDSP#W4?
Yes, the R5F21284SDSP#W4 integrates a hardware LIN module compliant with LIN 2.0/2.1 standards, implemented using Timer RA and UART0. It handles frame generation, checksum calculation, and synchronization without CPU intervention, reducing firmware overhead in automotive body networks.
R5F21284SDSP#W4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 20-LSSOP (0.173", 4.40mm Width)
- Series:
- R8C/2x/28
- Packaging:
- Tape & Reel (TR)
- 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:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 1K 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:
R5F21284SDSP#W4 FAQ
1.How can I place an order for R5F21284SDSP#W4 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F21284SDSP#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 R5F21284SDSP#W4 reliable?
The price and inventory of R5F21284SDSP#W4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21284SDSP#W4 is usually 5 days.
3.What payment methods are accepted for R5F21284SDSP#W4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21284SDSP#W4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F21284SDSP#W4?
R5F21284SDSP#W4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F21284SDSP#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 R5F21284SDSP#W4?
For technical support, including R5F21284SDSP#W4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21284SDSP#W4 requirements.
6.How does Aetrix verify that R5F21284SDSP#W4 is sourced from the original manufacturer or authorized distributors?
All R5F21284SDSP#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 R5F21284SDSP#W4 meets industry standards.
7.What is the process for return or replacement of R5F21284SDSP#W4?
All R5F21284SDSP#W4 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21284SDSP#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 R5F21284SDSP#W4 part is unused and in its original packaging.
Return procedure for R5F21284SDSP#W4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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