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Renesas R5F21181SP#U0
- Part No.:
- R5F21181SP#U0
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 20-LSSOP (0.173", 4.40mm Width)
- Datasheet:
-
R5F21181SP#U0.pdf
- Description:
- IC MCU 16BIT 4KB FLASH 20LSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,307
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Product details
Overview
R5F21181SP#U0 from Renesas Electronics is a 16-bit single-chip microcontroller in the R8C/18 Group, featuring an R8C/Tiny Series CPU core, 4 KB flash program memory, 384 bytes RAM, and operation at up to 20 MHz (50 ns min. instruction time). It integrates timers (X/Z/C), UART, clock-synchronous serial I/O, 1-bit comparator (4 channels), watchdog timer, and 13 I/O pins-including LED drive capability-targeting embedded control in household appliances and industrial sensors.
For engineers reviewing the R5F21181SP#U0 datasheet, R5F21181SP#U0 pinout, R5F21181SP#U0 application, or R5F21181SP#U0 equivalent, this page delivers verified specifications, package mapping to PLSP0020JB-A (20-pin LSSOP), validated pin functions, real-world use cases, and two confirmed alternative parts with documented technical and application differences.
Technical Context
The R5F21181SP#U0 implements a silicon-gate CMOS 16-bit CPU with 89 fundamental instructions and a 1 Mbyte address space. Its peripheral set includes Timer X (8-bit), Timer Z (8-bit), Timer C (16-bit with input capture/output compare), dual UART channels, and a 4-channel 1-bit comparator-all controlled via dedicated SFRs mapped to addresses 00000h–002FFh.
It supports single-chip operation with on-chip clock generation: main crystal/ceramic resonator circuit (XIN/XOUT) and high-/low-speed on-chip oscillators (the former with frequency adjustment). Power management includes wait mode (35 µA typ.) and stop mode (0.7 µA typ.) at 3.0 V, with built-in power-on reset and voltage detection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C/Tiny Series 16-bit, 89 instructions, 1 Mbyte address space |
| Memory | 4 KB flash program ROM, 384 bytes RAM - sufficient for compact firmware with real-time sensor polling and LED feedback |
| Timing Performance | 50 ns min. instruction execution (20 MHz, 3.0–5.5 V) - enables deterministic response in sub-100 µs control loops |
| Supply Voltage | 2.7–5.5 V - compatible with both 3.3 V and 5 V system rails without level-shifting |
| Power Modes | Wait mode: 35 µA typ. (3.0 V); Stop mode: 0.7 µA typ. (3.0 V) - suitable for battery-backed sensor nodes |
| Operating Temperature | −20°C to +85°C - rated for commercial/industrial indoor environments |
| Package | 20-pin LSSOP (PLSP0020JB-A), 0.65 mm pitch - surface-mount compatible with standard reflow profiles |
Pinout & Package
Package: 20-pin molded-plastic LSSOP (PLSP0020JB-A), 7.6 mm × 4.4 mm body, 0.65 mm lead pitch, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 19, 20 | I/O port P3_5 / P3_7 / P3_3 / P3_4 | General-purpose CMOS I/O; P3_3 also serves as Timer C input (TCIN) and interrupt INT3 |
| 3 | RESET | Active-low asynchronous reset input - requires external pull-up; initiates hardware reset sequence |
| 4, 6 | XOUT / XIN | Main clock oscillator terminals - support ceramic resonator (3–10 MHz) or crystal (1–20 MHz) |
| 5, 7 | VSS/AVSS / VCC/AVCC | Dual power domains: digital (VCC/VSS) and analog (AVCC/AVSS) - decoupling capacitors required per domain |
| 8 | MODE | Boot-mode select - must be tied to VCC via resistor to enable normal flash execution |
| 9 | P4_5 | Interrupt INT0 input and UART RXD1 - supports wake-up from stop mode on falling edge |
| 10–18 | P1_7 to P1_0 | 8-bit I/O port with key-interrupt (KI0–KI3), analog inputs (AN8–AN11), comparator inputs (CMP0_0–CMP0_2), and LED drive capability |
| 11, 12 | P1_6 / P1_5 | CLK0 (serial clock I/O) and RXD0/CNTR01/INT11 - enables synchronous serial communication and counter input |
| 13, 14 | P1_4 / P1_3 | TXD0 (UART output) and TZOUT (Timer Z output) - supports full-duplex UART and PWM waveform generation |
Key Features
| Feature | Design Value |
|---|---|
| On-chip oscillators | High-speed and low-speed on-chip oscillators eliminate need for external crystals in cost-sensitive designs |
| LED drive ports | Four I/O pins (P1_0–P1_3) support direct LED sinking - reduces BOM count in status-indicator applications |
| Comparator subsystem | One 1-bit comparator circuit with four selectable analog inputs (AN8–AN11) - enables threshold-based sensor monitoring |
| Low-power modes | Stop mode (0.7 µA) and wait mode (35 µA) with selective peripheral clock gating - extends battery life in intermittent-sensing systems |
| Interrupt architecture | 7 priority levels, 18 total sources (10 internal, 4 external, 4 software) - supports nested real-time event handling |
Applications
| Home Appliance Control | Industrial Sensor Node |
|---|---|
|
Use Scenario: Microcontroller in washing machine control board managing motor sequencing, water valve actuation, and user interface LEDs. IC Role / Device Role / Timing Role: Primary system controller executing state-machine logic, driving 4 LED indicators directly, and sampling door switch/analog temperature sensor via comparator. Use Value: Integrated LED drive and comparator reduce external components; 4 KB flash accommodates safety-critical firmware with CRC checks. |
Use Scenario: Standalone temperature/humidity sensor node transmitting data over UART to gateway, operating on coin cell for >1 year. IC Role / Device Role / Timing Role: Low-power sensor aggregator sampling analog sensor outputs, performing threshold comparison, and entering stop mode between transmissions. Use Value: 0.7 µA stop current and on-chip voltage detection enable reliable battery operation; UART supports direct connection to LPWAN modules. |
| Office Equipment Interface | Security System Keypad |
|
Use Scenario: Embedded controller in document scanner managing paper feed motor, button inputs, and status LEDs. IC Role / Device Role / Timing Role: Real-time I/O coordinator using key-interrupt inputs (KI0–KI3) for button debounce and Timer C for precise motor timing. Use Value: Dedicated key-interrupt capability eliminates software polling overhead; 20 MHz operation ensures responsive UI feedback. |
Use Scenario: Keypad controller in access control panel detecting keypresses, validating codes, and triggering relay output. IC Role / Device Role / Timing Role: Secure input processor using P1_0–P1_3 as scanned matrix rows and P3_3/P3_4 as columns, with comparator for tamper-sensor voltage monitoring. Use Value: Hardware key-interrupt and comparator allow immediate response to both valid keypresses and physical intrusion attempts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F21182SP | 8 KB flash, 512 bytes RAM - double program memory and RAM capacity | Required when firmware exceeds 4 KB or needs larger data buffers (e.g., multi-sensor fusion) | Select R5F21182SP if future firmware expansion or additional peripheral drivers are anticipated; same pinout and package. |
| R5F21191SP | Includes 2 KB data flash (1 KB × 2 blocks) - enables EEPROM-like parameter storage | Necessary for field-updatable calibration data or user preferences that must survive power loss | Choose R5F21191SP only if non-volatile parameter storage beyond program flash is required; otherwise R5F21181SP#U0 is optimal. |
Compared with R5F21182SP (larger memory) and R5F21191SP (data flash), the R5F21181SP#U0 provides the minimal viable configuration for cost-sensitive, fixed-function embedded control - balancing flash size, RAM, and feature set without over-provisioning.
Availability
R5F21181SP#U0 is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, and office equipment interfaces requiring stable component supply across production lifecycles.
Supply support for R5F21181SP#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, and power solutions for automotive, industrial, and IoT markets.
The R8C/18 Group, including R5F21181SP#U0, was designed for cost-effective, low-power embedded control in consumer and general industrial applications - emphasizing integration, ease of use, and qualification for commercial temperature ranges.
FAQ
What is the maximum operating frequency and corresponding supply voltage range for R5F21181SP#U0?
The R5F21181SP#U0 operates at up to 20 MHz with a supply voltage of 3.0–5.5 V, achieving a minimum instruction execution time of 50 ns. At 10 MHz, it supports a wider voltage range of 2.7–5.5 V. These ratings are specified in the electrical characteristics section of the official Renesas datasheet REJ03B0124-0140.
Does R5F21181SP#U0 include on-chip debug support for in-circuit programming?
Yes, the R5F21181SP#U0 supports on-chip debugging via the single-wire debug interface using the Renesas E8 emulator or compatible tools. Flash programming is performed through the on-chip bootloader using UART or dedicated programming pins - no external programmer hardware is required for field updates.
What are the analog input capabilities of R5F21181SP#U0, and how are they used?
The R5F21181SP#U0 provides four analog input channels (AN8–AN11) routed to a single 1-bit comparator with four selectable inputs. It does not include an ADC; instead, it performs threshold comparisons against VREF. This enables simple over/under-voltage detection in battery monitors or thermal cutoff circuits without conversion overhead.
Can R5F21181SP#U0 drive LEDs directly, and which pins support this function?
Yes, R5F21181SP#U0 can drive LEDs directly using P1_0 through P1_3 - all configured as CMOS I/O with sink capability. These pins are designated as LED drive ports in the datasheet and support common-anode configurations with external current-limiting resistors, reducing external driver components.
Is R5F21181SP#U0 qualified for automotive applications?
No, R5F21181SP#U0 is rated for −20°C to +85°C operation and classified as a "Standard" quality grade device per Renesas documentation. It is intended for computers, office equipment, home appliances, and industrial robots - not for automotive, medical life-support, or aerospace applications requiring AEC-Q100 or "High Quality"/"Specific" grading.
R5F21181SP#U0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 20-LSSOP (0.173", 4.40mm Width)
- Series:
- R8C/1x/18
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- R8C
- Core Size:
- 16-Bit
- Speed:
- 20MHz
- Connectivity:
- SIO, UART/USART
- Peripherals:
- LED, POR, Voltage Detect, WDT
- Number of I/O:
- 13
- Program Memory Size:
- 4KB (4K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 384 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F21181SP#U0 FAQ
1.How can I place an order for R5F21181SP#U0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F21181SP#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 R5F21181SP#U0 reliable?
The price and inventory of R5F21181SP#U0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21181SP#U0 is usually 5 days.
3.What payment methods are accepted for R5F21181SP#U0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21181SP#U0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F21181SP#U0?
R5F21181SP#U0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F21181SP#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 R5F21181SP#U0?
For technical support, including R5F21181SP#U0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21181SP#U0 requirements.
6.How does Aetrix verify that R5F21181SP#U0 is sourced from the original manufacturer or authorized distributors?
All R5F21181SP#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 R5F21181SP#U0 meets industry standards.
7.What is the process for return or replacement of R5F21181SP#U0?
All R5F21181SP#U0 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21181SP#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 R5F21181SP#U0 part is unused and in its original packaging.
Return procedure for R5F21181SP#U0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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