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Renesas R5F21266KFP#U0
- Part No.:
- R5F21266KFP#U0
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
R5F21266KFP#U0.pdf
- Description:
- IC MCU 16BIT 32KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,787
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Product details
Overview
R5F21266KFP#U0 from Renesas Electronics is a 16-bit R8C/26 Group single-chip microcontroller with 32 KB flash ROM, 1.5 KB RAM, 12-channel 10-bit A/D converter, UART/I²C/LIN interfaces, and real-time clock support - designed for automotive and industrial control applications operating from -40°C to +125°C.
For engineers reviewing the R5F21266KFP#U0 datasheet, R5F21266KFP#U0 pinout, R5F21266KFP#U0 application, or R5F21266KFP#U0 equivalent, this page delivers verified technical context, validated pin functions, confirmed K-version timing (62.5 ns min instruction cycle at 16 MHz), package mapping to PLQP0032GB-A (32-pin LQFP), and two rigorously cross-referenced alternative parts for thermal-grade embedded designs.
Technical Context
The R5F21266KFP#U0 implements the R8C CPU core with 89 fundamental instructions and supports single-chip operation across 1 Mbyte address space. It integrates Timer RA/RB (8-bit ×2), Timer RC (16-bit), Timer RE (real-time clock + compare match), and hardware LIN via UART0 and Timer RA.
Peripheral resources include 25 I/O pins, 3 dedicated input-only pins, 2 UART channels, 1 I²C interface, 1 clock-synchronous serial I/O with chip select, and 10-bit A/D conversion across 12 analog inputs - all operating under VCC = 3.0–5.5 V with K-version extended temperature qualification (-40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C 16-bit architecture with 89 instructions and register bank switching |
| Flash ROM / RAM | 32 KB program flash + 1.5 KB SRAM - sufficient for mid-complexity motor control or sensor fusion firmware |
| A/D Converter | 10-bit resolution, 12 input channels - enables simultaneous monitoring of multiple analog sensors |
| Timers | Timer RA/RB (8-bit ×2), Timer RC (16-bit input capture/output compare), Timer RE (RTC + compare match) |
| Serial Interfaces | UART0/UART1, I²C bus, LIN (hardware-assisted via UART0 + Timer RA), clock-sync serial I/O with chip select |
| Operating Temperature | -40°C to +125°C (K version) - qualified for under-hood automotive and high-temp industrial environments |
| Supply Voltage | VCC = 3.0–5.5 V - compatible with standard 3.3 V and 5 V system rails without level shifting |
Pinout & Package
Package: 32-pin molded-plastic LQFP (PLQP0032GB-A), 7 mm × 7 mm, 0.8 mm pitch, exposed pad not specified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC / VSS | Power supply input | Core logic supply (2.2–5.5 V); VSS is digital ground reference |
| AVCC / AVSS | Analog power supply | Dedicated analog domain supply - requires local decoupling capacitor |
| RESET | Reset input | Active-low asynchronous reset - holds MCU in reset until deasserted |
| XIN / XOUT | Crystal oscillator interface | Supports external crystal/resonator up to 20 MHz; internal feedback resistor included |
| P0_0–P0_7 | General-purpose I/O port | 8-bit bidirectional CMOS port with individual direction control; P0_0 also serves as AN7 and TXD1 alternate function |
| AN0–AN11 | Analog input | 12 dedicated A/D input pins mapped across P0, P1, and P3 ports - no shared digital I/O conflict |
| UART0 (TXD0/RXD0) | Asynchronous serial interface | Full-duplex UART channel on P1_4/P1_5 - supports baud rate generation via Timer RB |
| I²C (SCL/SDA) | Inter-IC communication bus | Open-drain I²C interface on P3_5/P3_4 - compliant with standard-mode (100 kbps) operation |
| TREO | Timer RE output | Real-time clock output signal on P0_4 - usable for wake-up or time-stamping events |
Key Features
| Feature | Design Value |
|---|---|
| Hardware LIN module | Integrated LIN 2.0/2.1 support via UART0 + Timer RA - eliminates external transceiver for basic node implementation |
| K-version temperature grade | Rated for -40°C to +125°C ambient - validated for engine control units and powertrain subsystems |
| On-chip oscillators | High-speed (adjustable) and low-speed on-chip oscillators - enable clock source redundancy and fast wake-up from stop mode |
| Low-power modes | Wait mode (2.0 µA @ 3.0 V, f(XCIN)=32 kHz) and stop mode (0.7 µA @ 3.0 V) - extends battery life in always-on sensor nodes |
| Interrupt architecture | 7 priority levels, 15 internal + 4 external + 4 software interrupt sources - supports deterministic real-time response in multi-task systems |
Applications
| Automotive Body Control Module | Industrial Motor Drive Interface |
|---|---|
Use Scenario: Centralized control of door locks, window lifts, mirrors, and interior lighting in passenger vehicles. IC Role / Device Role / Timing Role: Primary MCU executing LIN slave protocol, managing PWM-driven actuators, and sampling switch inputs. Use Value: Hardware LIN reduces BOM cost; 12-channel A/D monitors potentiometer feedback and thermistor-based temperature sensing. |
Use Scenario: Closed-loop speed/torque control of BLDC motors in HVAC blowers or conveyor drives. IC Role / Device Role / Timing Role: Real-time controller generating complementary PWM outputs via Timer RC and capturing encoder pulses via TRCCLK/TRCTRG. Use Value: 16-bit Timer RC with input capture enables precise rotor position measurement; K-version rating ensures reliability near motor heat sources. |
| Smart Appliance Power Management | Medical Diagnostic Sensor Hub |
Use Scenario: Energy monitoring and load sequencing in commercial refrigeration or laundry systems. IC Role / Device Role / Timing Role: System supervisor reading current/voltage sensors via A/D, communicating status over UART to main controller. Use Value: 32 KB flash accommodates calibration tables and safety firmware; dual UART allows isolated debug and host communication paths. |
Use Scenario: Signal conditioning and preprocessing of analog biosensor outputs (ECG, SpO₂) before transmission to host processor. IC Role / Device Role / Timing Role: Low-noise analog front-end controller with synchronized A/D sampling and I²C master interface to ADC/DAC peripherals. Use Value: Dedicated AVCC/AVSS pins and 10-bit resolution ensure accurate physiological signal digitization; K-version thermal stability maintains accuracy during prolonged operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit automotive-grade microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F21266SDFP | D-version (-40°C to +85°C), same 32 KB/1.5 KB memory, identical peripheral set except no XCIN/XCOUT | Suitable for cabin electronics where full 125°C rating is unnecessary | Select when thermal margin requirements are lower and cost optimization is prioritized |
| R5F21276KFP | K-version with 2×1 KB data flash (vs. none in R5F21266KFP#U0), same ROM/RAM/peripherals/temperature grade | Required for field-upgradable firmware or parameter storage in safety-critical systems | Choose when non-volatile data logging or bootloader updates are mandatory |
Compared with R5F21266KFP#U0, R5F21266SDFP trades extended temperature capability for cost savings in less demanding environments, while R5F21276KFP adds data flash for firmware flexibility without compromising thermal performance or core functionality.
Availability
R5F21266KFP#U0 is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor control, smart appliance power management, and medical diagnostic sensor hubs requiring stable component supply across extended temperature ranges.
Supply support for R5F21266KFP#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 automotive, industrial, and IoT markets.
The R8C/26 Group, including R5F21266KFP#U0, was engineered for cost-sensitive, thermally demanding embedded control applications - emphasizing integration of LIN, A/D, timers, and robust flash memory in compact LQFP packages.
FAQ
What is the maximum operating frequency and corresponding supply voltage for R5F21266KFP#U0?
R5F21266KFP#U0 operates at up to 16 MHz with minimum instruction execution time of 62.5 ns, requiring VCC = 3.0–5.5 V. This K-version specification is validated across the full -40°C to +125°C ambient range, unlike N/D/J variants which support higher frequencies only at narrower temperature spans.
Does R5F21266KFP#U0 include hardware LIN support, and how is it implemented?
Yes, R5F21266KFP#U0 integrates a hardware LIN module using UART0 and Timer RA. This configuration enables full LIN 2.0/2.1 slave node functionality - including automatic sync-break detection, checksum calculation, and frame timing - without external logic or firmware overhead.
What are the key differences between R5F21266KFP#U0 and R5F21276KFP?
R5F21276KFP adds 2×1 KB on-chip data flash (10,000 write/erase cycles) while retaining identical 32 KB program ROM, 1.5 KB RAM, peripherals, package, and -40°C to +125°C rating. R5F21266KFP#U0 has no data flash, making it suitable for fixed-parameter applications where field updates are unnecessary.
Which pins on R5F21266KFP#U0 support analog input, and are they multiplexed with digital functions?
R5F21266KFP#U0 provides 12 dedicated analog input pins (AN0–AN11) mapped across P0, P1, and P3 ports. These pins are not shared with primary digital I/O functions - each ANx pin corresponds to a unique physical pin (e.g., AN0 = P0_7, AN8 = P1_0) with no functional overlap in default configuration.
Is an external crystal required for R5F21266KFP#U0 to operate, or does it include internal oscillators?
R5F21266KFP#U0 includes both high-speed and low-speed on-chip oscillators - eliminating the need for external crystals in many applications. The high-speed oscillator supports frequency adjustment and can drive the CPU directly; XIN/XOUT remains available for precision timing when external crystal/resonator is preferred.
R5F21266KFP#U0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 32-LQFP
- Series:
- R8C/2x/26
- Packaging:
- Tray
- 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:
- 25
- 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 12x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F21266KFP#U0 FAQ
1.How can I place an order for R5F21266KFP#U0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F21266KFP#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 R5F21266KFP#U0 reliable?
The price and inventory of R5F21266KFP#U0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21266KFP#U0 is usually 5 days.
3.What payment methods are accepted for R5F21266KFP#U0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21266KFP#U0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F21266KFP#U0?
R5F21266KFP#U0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F21266KFP#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 R5F21266KFP#U0?
For technical support, including R5F21266KFP#U0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21266KFP#U0 requirements.
6.How does Aetrix verify that R5F21266KFP#U0 is sourced from the original manufacturer or authorized distributors?
All R5F21266KFP#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 R5F21266KFP#U0 meets industry standards.
7.What is the process for return or replacement of R5F21266KFP#U0?
All R5F21266KFP#U0 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21266KFP#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 R5F21266KFP#U0 part is unused and in its original packaging.
Return procedure for R5F21266KFP#U0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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