R5F211A2SP#U0 - 16-Bit 20MHz MCU | Renesas Electronics
料号： R5F211A2SP#U0 ✓ 量产中R5F211A2SP#U0 概述
An MCU is a semiconductor that integrates a processor core, program memory, data memory, and peripheral I/O into one device. The R8C family uses a 16-bit CISC architecture, combining compact code-oriented processing with dedicated timer, serial, timer, and interrupt resources. R5F211A2SP#U0 is positioned for cost-conscious embedded applications where 8 KB of flash is sufficient for compact control firmware and where a 20 MHz operating rate provides useful headroom for protocol handling, state-machine control, and periodic sensing.
The main verified features include 8 KB (8K x 8) flash memory, 512 x 8 bits of RAM, 13 I/O pins, a 20 MHz maximum clock, and a 3/5 V supply capability. The 20-LSSOP body measures approximately 0.173 inch, or 4.40 mm, in width. Its Pb-free status is explicitly identified by Mouser, while the official Renesas product page classifies it as an R8C CPU Core microcontroller in the non-promotion family.
The R8C/1x/1A device is suitable for embedded motor and appliance control, digital instrumentation, sensor conditioning, industrial interface modules, and compact consumer controllers. Its 13 available I/O lines can connect digital inputs and outputs to sensors, relays, indicators, and external interface circuits. Designers should account for the limited 8 KB flash when sizing application code and should use a separate programmer or the documented Renesas programming workflow to load and verify firmware.
For 3.3 V systems, the listed 3/5 V operating designation is convenient, while the cross-reference data specifies a 2.7 V to 5.5 V supply range. A practical design should preserve adequate decoupling near VDD and VSS, route oscillator-related and reset circuitry according to the manufacturer guidance, and verify every external peripheral against the selected 20-LSSOP footprint. This page consolidates manufacturer and distributor specifications, replacement evidence, application guidance, and design considerations that are more useful than a distributor specification table alone.
直接替换替代料： R5F211A2SP#U0 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
R5F211B2DSP#U0
✅ 直接替换📋 参考替代料（不在目录中）
R5F211A2SP#U0 最大额定值与电气特性
| CPU Type | 16-bit R8C CISC microcontroller |
| Product Family | R8C/1x/1A |
| Maximum Clock Speed | 20 MHz |
| Program Memory Size | 8 KB (8K x 8) |
| Program Memory Type | Flash |
| RAM Size | 512 x 8 bits |
| Number of I/O Ports | 13 |
| 电源电压 | 2.7 V to 5.5 V |
| Nominal Supply Levels | 3.3 V / 5 V |
| Oscillator Type | Internal |
| 封装 | 20-LSSOP |
| Package Width | 4.40 mm (0.173 inch) |
| 引脚数量 | 20 pins |
| 工作温度范围 | -20°C to +85°C |
| Packaging | Tube |
| Lead-Free Status | Pb-Free |
| 安装类型 | Surface mount |
R5F211A2SP#U0 4.40 mm (0.173 inch) 引脚配置指南
R5F211A2SP#U0（4.40 mm (0.173 inch) 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： R5F211A2SP#U0.
请参阅 数据手册 以查看完整引脚配置。
典型应用
R5F211A2SP#U0 适用于 6 应用s: Compact Appliance Control, Industrial Sensor Interface, Digital Instrumentation, Low-Voltage Embedded Control, Consumer Equipment Controller, Timing and Sequence Controller.
Compact Appliance Control
R5F211A2SP#U0 fits compact appliance controllers that coordinate buttons, indicators, sensors, and a small number of actuators. Its 16-bit R8C core runs at up to 20 MHz, while the verified 8 KB flash and 512 x 8 bits of RAM suit firmware centered on state machines, timing, and local I/O rather than storage-heavy applications. The 13 available I/O lines provide a practical interface to digital controls, and operation from 2.7 V to 5.5 V allows the same MCU family to support both 3.3 V and 5 V product architectures. Designers should budget code space for startup, protection logic, and communication routines, and should verify the complete pin multiplex against the Renesas datasheet before laying out the 20-LSSOP footprint.
推荐
Industrial Sensor Interface
R5F211A2SP#U0 can serve as the local controller for a small industrial sensor interface that converts external sensor states into readable data or local control actions. Its 20 MHz maximum clock is sufficient for digital debouncing, sampling coordination, status filtering, and simple serial protocols when those functions are implemented efficiently. The 13 I/O ports support discrete sensor inputs and control outputs without requiring a large external peripheral set. Because the verified specifications provide 8 KB flash and 512 x 8 bits of RAM, the application must keep buffering modest and avoid memory-intensive algorithms. Production designs should also include input protection, deterministic reset behavior, and a robust programming and test strategy.
推荐
Digital Instrumentation
The R5F211A2SP#U0 is appropriate for digital instrumentation where a compact MCU must acquire discrete inputs, run measurement timing, drive displays or indicators, and manage a simple operator interface. A 16-bit CISC R8C core operating at up to 20 MHz provides a capable platform for calibration tables and sequential control logic, while the internal oscillator avoids requiring an external clock in basic designs. The 20-LSSOP package also supports compact instrument layouts. Firmware must remain within the verified 8 KB flash limit, and any application requiring extensive history buffers, complex graphics, or high-rate conversion should consider a higher-memory MCU. Exact peripheral availability and analog functions must be confirmed from the manufacturer datasheet.
推荐
Low-Voltage Embedded Control
R5F211A2SP#U0 is suitable for low-voltage embedded controllers operating from 2.7 V through 5.5 V, including 3.3 V and 5 V equipment. The verified 13 I/O count and internal oscillator simplify designs where a small number of local signals must be handled without adding a separate clock device. Its 16-bit architecture and 20 MHz clock can support responsive control sequences, debouncing, and protocol tasks, but the 512 x 8 bits of RAM constrains buffering depth. Layout should place effective bypassing at the supply pins, follow the manufacturer grounding guidance, and verify every signal against the 20-LSSOP pin map rather than assigning functions solely from the generic package pin count.
推荐
Consumer Equipment Controller
R5F211A2SP#U0 can act as the central controller in compact consumer equipment where the required functions are primarily digital sequencing, user-interface control, and limited external communication. Its 20 MHz R8C processor provides more headroom than a very small 8-bit controller for structured task scheduling, while the 8 KB flash keeps the firmware footprint suitable for focused products. The 13 I/O lines can serve switches, status LEDs, relay-control inputs, and bus interfaces when the selected pin functions support them. Designers should not assume the presence of a particular communication converter or analog subsystem until it is verified in the exact datasheet, and should confirm that the available flash remains sufficient after adding the selected compiler library and bootloader.
推荐
Timing and Sequence Controller
R5F211A2SP#U0 is appropriate for timing and sequence control tasks where multiple outputs must follow a defined order and respond to external events. The 16-bit R8C core can execute more structured sequencing logic than a basic 8-bit controller, and the verified 20 MHz operating rate supports responsive task execution. The MCU's 13 I/O ports are useful for connecting sensors, interlocks, and actuator drivers, although external drivers must handle current, isolation, and voltage levels. Because the supplied specification excerpt does not enumerate timer channels, pulse widths, or capture features, engineers should consult the manufacturer datasheet for exact timer capabilities. Firmware and safety interlocks should not rely on undocumented peripheral behavior.
推荐
推荐产品汇总
工程参考数据： R5F211A2SP#U0 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | R5F211B2DSP#U0 |
|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics |
| Package | 20-LSSOP | 20-LSSOP |
| CPU Architecture | 16-bit | 16-bit |
| Product Family | R8C/1x/1A | R8C family |
| Program Memory | 8 KB Flash | 8 KB Flash |
关键差异点
- Verified 20 MHz operation with an 8-bit-organized flash architecture （对比 R5F211B2DSP#U0)
- Documented RAM allocation （对比 R5F211B2DSP#U0)
- Clear input-output allocation for compact controllers （对比 R5F211B2DSP#U0)
设计说明
Use the exact PLSP0020JB-A package drawing and land pattern from the applicable Renesas documentation rather than creating a generic 20-LSSOP footprint. The verified package width is 4.40 mm, and small differences in lead pitch, span, and solder-mask geometry can affect solderability or pad alignment. Place the decoupling capacitor at the device supply pins with a short, low-inductance path, and connect the ground return through the package ground pins according to the datasheet. Verify pin 1, programming signals, reset, and oscillator connections on the schematic before fabrication.
Design the power rail for the documented 2.7 V to 5.5 V operating range and account for 3.3 V and 5 V system compatibility. Place local high-frequency bypass capacitance close to the MCU, then add bulk capacitance according to the power-source impedance and the manufacturer's guidance. Do not infer average or peak current from the CPU frequency alone; obtain the device-specific supply-current and internal-peripheral operating conditions from the full datasheet. Check startup and brownout behavior against the system power sequence, especially when the MCU controls other loads.
Treat the 8 KB flash and 512 x 8 bits of RAM as hard design limits rather than nominal targets. Include the compiler runtime, drivers, interrupts, bootloader, and application code when sizing flash, and avoid placing large volatile buffers in the limited RAM. Also verify whether a feature shown in a family comparison belongs to this exact suffix and package. The R5F211B2DSP#U0 candidate has the same listed headline memory and package, but exact pin multiplexing and peripheral functions must be checked before it is treated as a drop-in substitute.
合规信息
Mouser explicitly identifies R5F211A2SP#U0 as Pb-Free. No explicit RoHS, REACH, AEC-Q100, halogen-free, or conflict-minerals statements were present in the verified data. The Renesas product page classifies the device as an R8C CPU Core microcontroller in the non-promotion family.
