Renesas R5F211A4SP#U0

Overview

R5F211A4SP#U0 from Renesas Electronics is a 16-bit single-chip microcontroller in the R8C/1A Group, featuring an R8C/Tiny Series CPU core, 16 KB flash program memory, 1 KB RAM, and operation at up to 20 MHz (50 ns min instruction time). It integrates a 10-bit 4-channel ADC, three timers (8-bit ×2, 16-bit ×1), UART, clock-synchronous serial I/O, I²C bus interface, and LED drive capability on four I/O pins. It targets cost-sensitive embedded control in consumer appliances and industrial sensors.

For engineers reviewing the R5F211A4SP#U0 datasheet, R5F211A4SP#U0 pinout, R5F211A4SP#U0 application, or R5F211A4SP#U0 equivalent, key selection criteria include its 20-pin LSSOP package (PLSP0020JB-A), -20°C to +85°C ambient rating, on-chip voltage detection and power-on reset, and support for wait/stop low-power modes with 35 µA and 0.7 µA typical current draw.

Technical Context

The R5F211A4SP#U0 implements the R8C/Tiny Series CPU core with 89 fundamental instructions and a 1 Mbyte linear address space. Its dual clock system includes a main crystal/resonator oscillator (XIN/XOUT) and an adjustable high-speed on-chip oscillator, both supported by oscillation stop detection.

Peripheral integration centers on mixed-signal control: four analog inputs feed a 10-bit A/D converter; Timer C provides input capture and output compare; and three serial interfaces-UART, clock-synchronous I/O, and I²C-enable sensor interfacing and host communication without external transceivers.

Key Specifications

Pinout & Package

Package: 20-pin molded-plastic LSSOP (PLSP0020JB-A), 0.65 mm pitch, surface-mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F211A4SP#U0, R5F211A4DSP#U0 extends thermal reliability for harsher environments, while R5F211B4SP#U0 adds data retention flexibility at higher cost - neither is pin-compatible drop-in replacements, but share identical footprint and software compatibility within the R8C/1A–1B family.

Availability

R5F211A4SP#U0 is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, office equipment, and portable audio devices requiring stable component supply and long-term production continuity.

Supply support for R5F211A4SP#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/1A Group, including R5F211A4SP#U0, was designed for cost-optimized 16-bit embedded control in consumer and general industrial applications where reliability, low power, and integrated analog peripherals are essential.

FAQ

What is the maximum operating frequency and corresponding supply voltage range for R5F211A4SP#U0?

The R5F211A4SP#U0 operates at up to 20 MHz with a supply voltage of 3.0 V to 5.5 V. At 10 MHz, it supports a wider range of 2.7 V to 5.5 V. This dual-voltage/frequency specification allows flexible power design - for example, running at 20 MHz from a regulated 5 V rail in appliances, or at 10 MHz from a 3.3 V battery-supplied rail in portable devices - while maintaining full peripheral functionality across both configurations.

Does R5F211A4SP#U0 include on-chip debug support, and what interface is used?

Yes, the R5F211A4SP#U0 supports on-chip debugging via the single-wire background debug mode (BDM) using the dedicated MODE pin and RESET pin. No additional debug header or SWD/JTAG adapter is required - standard Renesas E8/E8a emulators connect directly to these two pins and VCC/VSS for full breakpoint, register, and memory access during development and field firmware updates.

Can R5F211A4SP#U0's A/D converter measure voltages beyond the VCC reference?

No. The R5F211A4SP#U0's 10-bit A/D converter uses AVCC as its default reference voltage and accepts analog inputs only within the 0 V to AVCC range (AN8–AN11). To measure higher voltages, external resistor dividers must scale the signal into this range. The VREF pin supports an external reference, but that reference must still be ≤ AVCC and ≥ 1.5 V per the datasheet - it does not extend the measurable input range beyond AVCC.

What packaging options are available for R5F211A4SP#U0, and which one is shipped for this part number?

The R5F211A4SP#U0 is specified for the PLSP0020JB-A package: a 20-pin plastic LSSOP with 0.65 mm lead pitch. While the R8C/1A Group also supports SDIP (PRDP0020BA-A) and HWQFN (PWQN0028KA-B) variants, the "SP" suffix in R5F211A4SP#U0 explicitly denotes the LSSOP package - confirmed in Table 1.3 and Figure 1.4 of the official documentation. No other package is valid for this exact part number.

Is there a built-in power-on reset circuit in R5F211A4SP#U0, and how does it interact with the external RESET pin?

Yes, the R5F211A4SP#U0 includes an on-chip power-on reset (POR) circuit that asserts internal reset until VCC rises above the POR threshold (~2.0 V). This works in parallel with the external active-low RESET pin: either condition - POR timeout completion or external RESET deassertion - releases the device from reset. The external pin remains fully functional for manual reset or system-level watchdog recovery, and shares the same internal reset synchronization logic as the POR signal.