Renesas R5F211A2SP#U0

Overview

R5F211A2SP#U0 from Renesas Electronics is a 16-bit single-chip microcontroller in the R8C/1A Group, featuring an R8C/Tiny Series CPU core, 8 KB flash program memory, 512 bytes RAM, and 20-pin LSSOP (PLSP0020JB-A) packaging. It delivers 50 ns minimum instruction execution at 20 MHz (V_CC = 3.0–5.5 V), integrates a 10-bit 4-channel A/D converter, dual UART/clock-synchronous serial interfaces, I²C bus support, and operates across –20°C to +85°C for industrial appliance control.

For engineers reviewing the R5F211A2SP#U0 datasheet, R5F211A2SP#U0 pinout, R5F211A2SP#U0 application, or R5F211A2SP#U0 equivalent, this MCU supports embedded timing-critical functions including LED drive port control, key input interrupt handling, analog sensor interfacing via AN8–AN11, and low-power wait/stop modes down to 0.7 µA - critical for battery-operated consumer and industrial edge devices.

Technical Context

The R5F211A2SP#U0 implements a silicon-gate CMOS R8C/Tiny CPU with 89 fundamental instructions and 1 Mbyte linear address space. Its peripheral set includes Timer X/Z (8-bit × 2), Timer C (16-bit with input capture/output compare), and three independent serial channels: one UART + clock-synchronous I/O, one UART-only, and one I²C/SSU interface.

On-chip clock generation comprises a main crystal/resonator oscillator (XIN/XOUT) and a high-speed/low-speed on-chip oscillator with frequency adjustment and oscillation stop detection. Voltage detection and power-on reset circuits are integrated, and the device supports 7-level priority interrupts with 11 internal, 4 external, and 4 software sources.

Key Specifications

Pinout & Package

Package: 20-pin molded-plastic LSSOP (PLSP0020JB-A), 0.65 mm lead pitch, exposed pad not present. Compatible with reflow soldering and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with R5F211A1SP#U0, the R5F211A2SP#U0 provides 4 KB additional flash and 128 bytes more RAM for enhanced feature sets; compared with R5F211A2DSP#U0, it trades extended temperature rating for lower cost in standard industrial environments.

Availability

R5F211A2SP#U0 is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, office equipment UI, and portable audio device applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for R5F211A2SP#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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power solutions for industrial and consumer markets.

The R8C/1A Group, including the R5F211A2SP#U0, was designed for cost-sensitive, space-constrained embedded control applications in appliances, office equipment, and industrial sensors - emphasizing integrated peripherals, low power, and ease of firmware development.

FAQ

What is the maximum operating frequency and corresponding supply voltage range for the R5F211A2SP#U0?

The R5F211A2SP#U0 achieves a minimum instruction execution time of 50 ns at 20 MHz, requiring V_CC = 3.0–5.5 V. At 10 MHz, it supports a wider supply range of 2.7–5.5 V. These specifications are confirmed in Table 1.1 of the R8C/1A Group datasheet (REJ03B0144-0140, Rev.1.40). The device uses an on-chip high-speed oscillator with frequency adjustment, eliminating need for external clock components in many designs.

Does the R5F211A2SP#U0 include built-in flash memory programming voltage regulation?

Yes, the R5F211A2SP#U0 supports in-system programming with V_CC = 2.7–5.5 V as the sole programming and erasure voltage source - no external high-voltage generator is required. Flash endurance is rated for 1,000 write/erase cycles, and the device includes on-chip voltage detection and power-on reset circuits to ensure reliable programming sequences. This capability is documented in the "Flash Memory" section of the R8C/1A Group specification tables.

How many analog input channels does the R5F211A2SP#U0 support, and what are their pin assignments?

The R5F211A2SP#U0 integrates a single 10-bit A/D converter with four analog input channels: AN8 (P1_0), AN9 (P1_1), AN10 (P1_2), and AN11 (P1_3). All channels share the same VREF pin (Pin 16) for reference voltage selection. This configuration is explicitly listed in Table 1.5 ("Pin Functions") and Figure 1.4 ("Pin Assignments for PLSP0020JB-A Package") of the official datasheet.

Can the R5F211A2SP#U0 operate in low-power modes, and what are the typical current draws?

Yes, the R5F211A2SP#U0 supports multiple low-power states: wait mode draws 35 µA (V_CC = 3.0 V, peripheral clocks off), and stop mode draws just 0.7 µA (V_CC = 3.0 V). These values are measured with the A/D converter stopped and are specified in the "Electric Characteristics" section of Table 1.1. The device enters these modes via software-controlled STOP/WAIT instructions and wakes via external interrupt or timer event.

Is the R5F211A2SP#U0 pin-compatible with other members of the R8C/1A Group in the same package?

Yes, all R8C/1A Group devices in the PLSP0020JB-A (20-pin LSSOP) package - including R5F211A1SP#U0, R5F211A2SP#U0, R5F211A3SP#U0, and R5F211A4SP#U0 - share identical pinouts and electrical characteristics. This allows firmware and PCB design reuse across memory variants. Pin compatibility is confirmed in Figures 1.4 and 1.5 and Tables 1.6–1.7 of the R8C/1A Group datasheet.