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Renesas R5F21321DNSP#W4
- Part No.:
- R5F21321DNSP#W4
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 20-LSSOP (0.173", 4.40mm Width)
- Datasheet:
-
R5F21321DNSP#W4.pdf
- Description:
- IC MCU 16BIT 4KB FLASH 20LSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,252
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Product details
Overview
R5F21321DNSP#W4 from Renesas Electronics is a 16-bit R8C CPU core microcontroller with 4 KB flash ROM, 1 KB RAM, and integrated peripherals including UART0/UART2 (with I²C mode), 10-bit × 4-channel A/D converter, four timers (RA/RB/RC/RE), watchdog timer, voltage detection circuit, and comparator B. It operates from 1.8 V to 5.5 V and supports -20°C to +85°C ambient temperature - used in consumer appliance control subsystems requiring low-power operation and mixed-signal integration.
For engineers reviewing the R5F21321DNSP#W4 datasheet, R5F21321DNSP#W4 pinout, R5F21321DNSP#W4 application, or R5F21321DNSP#W4 equivalent, this page delivers verified technical context, validated pin functions, confirmed operating parameters, and real-world use cases aligned to the R8C/32D Group specification document REJ03B0288-0100 Rev.1.00.
Technical Context
The R5F21321DNSP#W4 implements the R8C CPU core with 89 fundamental instructions, 16×16→32-bit hardware multiplier, and multiply-accumulate capability. Its memory map spans 1 Mbyte (00000h–FFFFFh), with fixed interrupt vector table at 0FFDCh–0FFFFh and SFRs mapped to 00000h–002FFh.
It integrates four independent clock sources: XIN/XOUT (up to 20 MHz), XCIN/XCOUT (32 kHz), high-speed on-chip oscillator (frequency-adjustable), and low-speed on-chip oscillator. Power management includes wait mode (3.5 µA @ 3.0 V, 32 kHz) and stop mode (2.0 µA @ 3.0 V), with voltage detection supporting power-on reset and dual-level monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C 16-bit core with 89 instructions, 50 ns min instruction time @ 20 MHz |
| Memory | 4 KB flash ROM (1,000 write/erase cycles), 1 KB RAM, 1 Mbyte address space |
| Operating Voltage | 1.8 V to 5.5 V - enables single-supply operation across battery and line-powered systems |
| Temperature Range | -20°C to +85°C (N version) - qualified for consumer and industrial equipment environments |
| Power Consumption | 6.5 mA typical @ 5.0 V/20 MHz; 3.5 µA @ 3.0 V in wait mode with 32 kHz clock |
| A/D Converter | 10-bit resolution × 4 channels with sample-and-hold and sweep mode - supports analog sensor interfacing |
| Timers | Timer RA (8-bit), RB (8-bit PWM), RC (16-bit with 4 capture/compare registers), RE (real-time clock) |
| Serial Interfaces | UART0 (full-duplex), UART2 with I²C-bus mode and multiprocessor communication support |
Pinout & Package
Package: 20-pin LSSOP (PLSP0020JB-A, 0.65 mm pitch), surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1_0/AN8/KI0 | Analog input / key interrupt / timer input | Shared function pin supporting A/D channel 8, key wake-up, and TRCIOD trigger |
| P1_1/AN9/KI1 | Analog input / key interrupt / timer input | Supports A/D channel 9, key interrupt 1, and TRCIOA/TRCTRG timer functions |
| P1_2/AN10/KI2 | Analog input / key interrupt / timer input | Enables A/D channel 10, key interrupt 2, and TRCIOB timer interface |
| P1_3/AN11/KI3/TRBO | Analog input / key interrupt / timer output | Provides A/D channel 11, key interrupt 3, and Timer RB pulse output |
| P1_4/TXD0/TRCCLK | UART transmit / timer clock input | Drives UART0 serial data out and supplies external clock to Timer RC |
| P1_5/RXD0/INT1/TRAIO | UART receive / interrupt / timer I/O | Accepts UART0 serial data, triggers INT1, and serves as Timer RA bidirectional I/O |
| P1_6/IVREF1/CLK0 | Comparator reference / clock I/O | Supplies reference voltage to Comparator B channel 1 and transfers CLK0 serial clock |
| P1_7/IVCMP1/INT1 | Comparator input / interrupt | Inputs analog signal to Comparator B channel 1 and doubles as secondary INT1 source |
| P3_3/IVCMP3/INT3/CTS2/RTS2 | Comparator input / interrupt / flow control | Supports Comparator B channel 3, INT3, and UART2 hardware handshaking signals |
| P3_4/IVREF3/RXD2/SCL2/TXD2/SDA2 | Comparator reference / UART/I²C I/O | Provides reference for Comparator B channel 3 and shares UART2/I²C bidirectional lines |
| P3_5/CLK2/TRCIOD | Serial clock / timer input | Transfers UART2 clock and routes TRCIOD trigger to Timer RC |
| P3_7/TRAO/RXD2/SCL2/TXD2/SDA2 | Timer output / UART/I²C I/O | Outputs Timer RA signal while sharing full UART2 and I²C bus functionality |
| P4_2/VREF | Analog reference input | Dedicated input for A/D converter reference voltage - not multiplexed |
| P4_5/ADTRG/INT0/RXD2/SCL2 | A/D trigger / interrupt / UART/I²C | Starts A/D conversion externally, asserts INT0, and shares UART2/I²C receive lines |
| P4_6/XIN/XCIN | Crystal/oscillator input | Primary high-speed (XIN) and low-speed (XCIN) clock source input - dual-function pin |
| P4_7/XOUT/XCOUT | Crystal/oscillator output | Drives external crystal/resonator for both XIN and XCIN clock circuits |
| RESET | Active-low reset input | Hardware reset assertion resets CPU, peripherals, and registers - synchronous deassertion required |
| MODE | Boot mode selection | Must be pulled high via resistor to enable normal flash execution mode |
| VCC/AVCC | Core/analog supply | Single 1.8–5.5 V supply powers digital logic and analog peripherals - AVCC requires local decoupling |
| VSS/AVSS | Digital/analog ground | Common ground reference; AVSS must be connected close to AVCC for A/D accuracy |
Key Features
| Feature | Design Value |
|---|---|
| On-chip debug support | Enables real-time firmware debugging and flash reprogramming without external emulator |
| Four independent clock sources | Allows dynamic switching between high-speed (20 MHz), low-power (32 kHz), and internal oscillators |
| Integrated voltage detection | Provides power-on reset and selectable voltage monitor levels to prevent brown-out operation |
| Programmable pull-up resistors | Eliminates external components on 15 CMOS I/O ports - reduces BOM count and board area |
| Real-time clock (Timer RE) | Tracks seconds, minutes, hours, and weekday without external RTC chip - saves system cost |
| I²C-bus mode on UART2 | Enables direct connection to standard I²C sensors and EEPROMs using existing UART hardware |
Applications
| Home Appliance Control | Office Equipment Motor Control |
|---|---|
|
Use Scenario: Embedded controller in microwave oven or rice cooker managing cooking cycles, display, keypad, and safety interlocks. IC Role / Device Role / Timing Role: Main system MCU executing state machine logic, reading thermistor inputs via A/D, driving LED segments, and generating PWM for fan motor speed control. Use Value: Integrated 4 KB flash and 1 KB RAM eliminate external memory; low-power wait mode extends standby battery life in cordless models. |
Use Scenario: Motor driver in multifunction printer handling paper feed, scanner carriage movement, and toner dispensing timing. IC Role / Device Role / Timing Role: Real-time motion controller using Timer RB PWM outputs and Timer RC capture inputs for encoder feedback synchronization. Use Value: 16-bit Timer RC with 4 capture/compare registers enables precise position tracking without external counter ICs. |
| Audio System Remote Interface | Industrial Sensor Hub |
|
Use Scenario: IR remote receiver and command decoder in stereo amplifier or soundbar with volume, source, and EQ control. IC Role / Device Role / Timing Role: Key input interrupt handler (KI0–KI3) decoding NEC protocol pulses, UART0 communicating with main audio DSP over RS-232 level-shifted link. Use Value: Dedicated key interrupt pins reduce firmware overhead; UART0's 50 ns instruction timing ensures accurate IR pulse edge sampling. |
Use Scenario: Local sensor aggregator in factory automation node collecting temperature, humidity, and vibration data before CAN transmission. IC Role / Device Role / Timing Role: Analog front-end processor converting sensor outputs via 10-bit A/D, applying digital filtering in firmware, and buffering data in internal RAM. Use Value: Sample-and-hold A/D and sweep mode allow simultaneous multi-channel acquisition - improves time-correlated measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F21322DNSP | 8 KB flash ROM, same 1 KB RAM, identical package and peripheral set | Required when firmware exceeds 4 KB or future expansion headroom is needed | Select if code size growth is anticipated; no hardware change required |
| R5F21324DNSP | 16 KB flash ROM, same RAM and peripherals, same LSSOP-20 package | Suitable for complex control algorithms or integrated communication stacks (e.g., Modbus RTU) | Choose for feature-rich firmware with multiple protocols or large lookup tables |
Compared with R5F21321DNSP#W4, the R5F21322DNSP and R5F21324DNSP offer scalable flash capacity while preserving identical I/O mapping, timing behavior, and power characteristics - enabling seamless firmware migration without PCB redesign.
Availability
R5F21321DNSP#W4 is available at Aetrix Electronics and suitable for home appliance control, office equipment motor sequencing, and audio system remote interface applications requiring stable component supply and long-term industrial availability.
Supply support for R5F21321DNSP#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, power, and SoC solutions for automotive, industrial, and consumer markets.
The R5F21321DNSP#W4 belongs to the R8C/32D Group - a family of cost-optimized 16-bit MCUs designed for resource-constrained embedded systems where low power, mixed-signal integration, and rapid development are critical.
FAQ
What is the maximum operating frequency of the R5F21321DNSP#W4?
The R5F21321DNSP#W4 supports a maximum external crystal frequency of 20 MHz at VCC = 2.7–5.5 V, delivering a minimum instruction execution time of 50 ns. At lower supply voltages (1.8–5.5 V), the maximum supported frequency is 5 MHz with 200 ns instruction timing - ensuring reliable operation across wide voltage ranges.
Does the R5F21321DNSP#W4 include an internal oscillator?
Yes, the R5F21321DNSP#W4 integrates both a high-speed on-chip oscillator (frequency-adjustable) and a low-speed on-chip oscillator (32 kHz). These can be selected independently for system clock or watchdog timer operation, eliminating the need for external crystals in cost-sensitive or space-constrained designs.
Can the R5F21321DNSP#W4 operate from a 1.8 V supply?
Yes, the R5F21321DNSP#W4 is fully specified to operate from 1.8 V to 5.5 V. At 1.8 V, it supports up to 5 MHz operation and retains full functionality of its A/D converter, timers, and UART interfaces - making it suitable for battery-powered portable devices.
How many A/D converter channels does the R5F21321DNSP#W4 have?
The R5F21321DNSP#W4 features a 10-bit successive-approximation A/D converter with four input channels (AN8–AN11), each supporting sample-and-hold and sweep mode. This allows sequential or triggered conversion of multiple analog sensors without external multiplexing.
Is the R5F21321DNSP#W4 pin-compatible with other R8C/32D Group members?
Yes, all R8C/32D Group MCUs - including R5F21321DNSP#W4, R5F21322DNSP, and R5F21324DNSP - share identical 20-pin LSSOP (PLSP0020JB-A) packaging and pinout. Firmware and hardware designs are interchangeable across flash capacity variants without layout changes.
R5F21321DNSP#W4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 20-LSSOP (0.173", 4.40mm Width)
- Series:
- R8C/3x/32D
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Programmable:
- Not Verified
- Core Processor:
- R8C
- Core Size:
- 16-Bit
- Speed:
- 20MHz
- Connectivity:
- I2C, LINbus, SIO, SSU, UART/USART
- Peripherals:
- POR, PWM, Voltage Detect, WDT
- Number of I/O:
- 15
- Program Memory Size:
- 4KB (4K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 1K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 5.5V
- Data Converters:
- A/D 4x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F21321DNSP#W4 FAQ
1.How can I place an order for R5F21321DNSP#W4 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F21321DNSP#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 R5F21321DNSP#W4 reliable?
The price and inventory of R5F21321DNSP#W4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21321DNSP#W4 is usually 5 days.
3.What payment methods are accepted for R5F21321DNSP#W4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21321DNSP#W4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F21321DNSP#W4?
R5F21321DNSP#W4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F21321DNSP#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 R5F21321DNSP#W4?
For technical support, including R5F21321DNSP#W4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21321DNSP#W4 requirements.
6.How does Aetrix verify that R5F21321DNSP#W4 is sourced from the original manufacturer or authorized distributors?
All R5F21321DNSP#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 R5F21321DNSP#W4 meets industry standards.
7.What is the process for return or replacement of R5F21321DNSP#W4?
All R5F21321DNSP#W4 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21321DNSP#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 R5F21321DNSP#W4 part is unused and in its original packaging.
Return procedure for R5F21321DNSP#W4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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