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HomeProductsIntegrated Circuits (ICs)Specialized ICsR5F100LEAFA
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R5F100LEAFA - Renesas Electronics Corporation

Manufacturer Part Number
R5F100LEAFA
Manufacturer
Renesas Electronics Corporation
Allelco Part Number
32D-R5F100LEAFA
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
14,510 pcs available, New & Original
Parts Description
DAC91001
Data sheet
-
Category
Integrated Circuits (ICs) > Specialized ICs
RoHs Status
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In stock: 14510

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Specifications

R5F100LEAFA Tech Specifications
Renesas Electronics Corporation - R5F100LEAFA technical specifications, attributes, parameters and parts with similar specifications to Renesas Electronics Corporation - R5F100LEAFA

Product Attribute Attribute Value
Part Number R5F100LEAFA
Package DAC91001
Description DAC91001
Stock Condition Get 14510 pcs available quantity at Allelco
Payment PayPal / TT / Credit Card / Western Union
Allelco Certifications ESD / ISO 9001 / ISO 13485 / ISO 28000
Product Attribute Attribute Value
Manufacturer Renesas Electronics Corporation
RoHs Status -
Warranty 100% Perfect Functions
Transport port Hong Kong
Shipping by DHL / FedEx / UPS / TNT / SF Express
RFQ Email info@allelco.com

Frequently Asked Questions(FAQ)

How does the R5F100LEAFA handle low-power operation in battery-powered embedded systems, and what are the practical implications for standby current and wake-up time?
The R5F100LEAFA is designed with a focus on power efficiency, featuring multiple low-power modes such as sleep and deep sleep, which reduce current consumption to tens of microamperes. In typical applications, this enables several weeks of operation on a single coin cell battery when using deep sleep mode with periodic wake-ups for sensor sampling or communication. The wake-up latency from deep sleep is approximately 20–30 microseconds, allowing rapid response to external interrupts without significant energy penalty. This behavior makes it suitable for wearable devices or remote monitoring nodes where energy budgeting is critical.
What is the maximum operating frequency and how does it impact real-time performance in control loop applications?
The R5F100LEAFA operates up to 48 MHz using its internal high-speed oscillator, enabling tight control loops with sub-microsecond response times. For instance, in a motor control application requiring 10-kHz PWM updates, the CPU can execute the entire interrupt service routine in under 50 clock cycles at full speed. However, sustained peak performance may require careful attention to code placement in faster memory blocks and optimization of interrupt latency, especially when using slower peripheral clocks.
Can the R5F100LEAFA interface directly with common 3.3V logic levels, or does level shifting become necessary?
Yes, the R5F100LEAFA supports 3.3V I/O voltage domains natively. Its GPIO pins are 5V-tolerant and operate at 3.3V logic levels, allowing direct connection to standard 3.3V peripherals like sensors, UART transceivers, and other microcontrollers without additional level-shifting circuitry. This simplifies board layout and reduces component count in mixed-voltage environments.
How does the flash memory size affect firmware development workflows and over-the-air update capabilities?
With 64 KB of on-chip flash, the R5F100LEAFA supports moderately complex applications but limits the use of large libraries or dynamic data structures. Firmware updates must be implemented with care due to limited space; delta updates or compressed binaries are often required. Additionally, flash write endurance (typically 10k cycles) necessitates wear-leveling algorithms if frequent rewrites occur, particularly in bootloader or logging scenarios.
What is the typical interrupt latency from an edge-triggered external pin event to ISR execution?
On average, the R5F100LEAFA achieves interrupt latency of 12–16 clock cycles when the core is running at 48 MHz, assuming no pending higher-priority tasks. This translates to roughly 0.25–0.33 microseconds from pin assertion to ISR entry under optimal conditions. Latency increases slightly if the core is executing a long instruction sequence or if context saving overhead dominates, but it remains well-suited for real-time event detection in industrial automation contexts.
How does the R5F100LEAFA compare to the R5F100LGAFA in terms of package size and pinout compatibility?
While both belong to the same R5F100 series, the R5F100LEAFA uses an LQFP-64 package, whereas the R5F100LGAFA employs a smaller QFN-48 package. The pinout is not fully compatible between these two variants due to differing numbers of GPIOs and peripheral assignments. Engineers selecting between them must consider board real estate constraints versus available functionality, as the LEAFA offers more I/O flexibility at the cost of larger footprint.
What considerations apply when implementing watchdog timers to prevent system hangs?
The R5F100LEAFA includes an independent hardware watchdog timer that resets the device if software fails to periodically clear it. It operates from a slow internal RC oscillator, ensuring functionality even during core failures. Best practice involves configuring a timeout window longer than the worst-case task duration—e.g., 200 ms for a typical RTOS tick interval—and ensuring critical tasks maintain regular feed sequences. Failure to service the WDT within the window triggers a full reset, preserving system reliability.
Is the internal oscillator accurate enough for applications requiring precise timing synchronization?
The internal high-speed oscillator has ±2% accuracy over temperature and voltage variations, making it adequate for general-purpose timing but insufficient for applications demanding tight synchronization across multiple devices. For protocols like CAN bus or IEEE 1588, external crystal oscillators paired with phase-locked loop (PLL) compensation yield better results. In such cases, the R5F100LEAFA’s PLL input stage allows stable multiplication of a 16-MHz crystal to achieve locked frequencies above 48 MHz.
What are the thermal characteristics and recommended PCB layout practices to ensure reliable operation?
Operating the R5F100LEAFA in ambient temperatures up to 85°C requires adherence to thermal design rules. The LQFP-64 package has a junction-to-ambient thermal resistance of approximately 70°C/W. To mitigate heating during prolonged high-load operation, designers should minimize power-dissipating components nearby, provide adequate copper pours under the IC, and avoid routing sensitive analog traces beneath the package. Thermal vias are recommended for heat dissipation into inner layers if ambient temperatures exceed 70°C.
How does the ADC resolution and sample rate trade off against power consumption?
The R5F100LEAFA integrates a 10-bit successive approximation ADC with selectable sample rates up to 1 Msps. Higher throughput modes consume more power due to increased charge pump activity and reference settling time. In low-power sensor applications, reducing the sample rate to 10 ksps cuts active current by nearly 80% compared to maximum speed. Thus, balancing resolution needs against duty-cycled operation allows engineers to tailor power-performance profiles effectively.
What precautions are needed when debugging code that accesses flash memory regions?
Since flash writes require erase cycles and special commands, accidental access via incorrect addressing can corrupt firmware. The R5F100LEAFA includes a built-in boot ROM that validates flash integrity before execution. During debugging, it's essential to disable flash write operations unless absolutely necessary, and use debugger scripts to enforce safe memory access patterns. Additionally, enabling flash wait states ensures correct timing during read accesses above certain clock thresholds, preventing data corruption.
How does the UART peripheral support baud rate generation flexibility, and what limits exist for high-speed serial communication?
The UART module supports programmable baud rates derived from the main system clock via fractional divider logic, enabling precise rates such as 115200 bps at 48 MHz. However, achieving very high baud rates like 921600 requires careful calibration to stay within receiver tolerance margins. The maximum practical rate is typically around 460800 bps due to clock quantization errors, beyond which bit sampling accuracy degrades significantly, leading to framing errors.
What role does the internal RAM size play in multitasking or interrupt-heavy applications?
With 8 KB of SRAM, the R5F100LEAFA provides modest scratchpad storage suitable for small RTOS contexts or interrupt buffers. In interrupt-intensive tasks, minimizing stack usage and avoiding dynamic allocation is crucial—each interrupt frame consumes several bytes, and nested interrupts quickly exhaust available space. Designers should profile worst-case stack depth early and consider splitting data between RAM and external memory if larger datasets are needed.
Can the R5F100LEAFA drive LED arrays directly without external transistors?
Yes, the R5F100LEAFA’s GPIO pins can source up to 15 mA per pin and withstand short bursts of higher current, allowing direct driving of low-density LED arrays or indicator lights. For higher-current loads (e.g., >20 mA), external NPN transistors or MOSFETs remain advisable to protect the MCU. Voltage drop across LEDs should also be accounted for in logic level interpretation if used in bidirectional signaling paths.
What are the implications of using external memory versus relying solely on internal flash?
Given the limited 64 KB flash, integrating external SPI flash or SRAM becomes necessary for data logging or large firmware images. The R5F100LEAFA lacks native support for parallel memory interfaces, so SPI-based expansion adds complexity in addressing and concurrency management. Careful partitioning of code and data between internal and external memories improves boot speed and responsiveness, but increases software overhead for memory arbitration and cache simulation.
How does the reset circuit design influence system robustness against brown-out events?
The R5F100LEAFA features an integrated voltage detector (BOD) that monitors supply rails and asserts reset if voltage drops below a programmable threshold (e.g., 2.7 V). Proper decoupling capacitors near the VDD pins, combined with a well-designed reset network using a pull-up resistor and capacitor, ensure clean power-on resets. Avoiding noise spikes on the reset line prevents false triggering, while setting BOD thresholds appropriately balances noise immunity with early intervention during supply sag.
What are the key differences in peripheral availability between the R5F100LEAFA and earlier revisions of the same family?
Compared to earlier versions, the R5F100LEAFA adds enhanced PWM channels and improved ADC linearity, along with stricter compliance to automotive-grade EMC standards. Earlier variants lacked certain comparator inputs and had reduced timer resolution, impacting motor control precision. Engineers upgrading from older parts should verify pin compatibility and recalibrate timing-sensitive peripherals to leverage the revised silicon improvements.
How should EMI/EMC concerns be addressed during layout to meet regulatory requirements?
To minimize radiated emissions from the R5F100LEAFA, maintain short trace lengths for high-speed signals, use ground planes under the package, and place bypass capacitors (0.1 µF ceramic) close to each VDD/VSS pair. Clock lines should be routed away from antennas or I/O headers. Additionally, disabling unused peripherals reduces conducted noise, and using spread-spectrum clocking (if supported) can lower peak emissions at harmonic frequencies. Compliance testing often reveals layout-dependent effects requiring iterative refinement.

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Customer Reviews

Evaluation: 10 Articles

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

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  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
  • QC (Quality Warranty)
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  • Packaging
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Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


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Electrostatic Discharge Protection and Handling

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  • ISO 9001: 2015
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Renesas Electronics Corporation

R5F100LEAFA

Renesas Electronics Corporation
32D-R5F100LEAFA

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