Renesas R5F21256SDFP#V2

Overview

R5F21256SDFP#V2 from Renesas Electronics is a 16-bit single-chip CMOS microcontroller in the R8C/25 Group, featuring an R8C/Tiny Series CPU core, 32 KB flash program memory, 2 KB RAM, and 2 KB on-chip data flash (1 KB × 2 blocks). It operates from 2.2 V to 5.5 V, supports −40°C to +85°C ambient temperature (D version), and integrates 12-channel 10-bit A/D conversion, dual UARTs, I²C, LIN hardware module, and multiple 8-/16-bit timers - deployed in industrial control panels and appliance motor management systems.

For engineers reviewing the R5F21256SDFP#V2 datasheet, R5F21256SDFP#V2 pinout, R5F21256SDFP#V2 application, or R5F21256SDFP#V2 equivalent, key selection criteria include its 52-pin LQFP package (PLQP0052JA-A), −40°C industrial temperature rating, dual UART + LIN support, and data flash endurance of 10,000 erase/write cycles - critical for firmware-over-the-air updates and parameter storage in field-deployed devices.

Technical Context

The R5F21256SDFP#V2 implements the R8C/Tiny CPU core with 89 fundamental instructions and executes at minimum 50 ns per instruction (20 MHz XIN, 3.0–5.5 V). Its memory architecture separates 32 KB program flash (1,000-cycle endurance) from 2 KB × 2-block data flash (10,000-cycle endurance), enabling independent code execution and nonvolatile parameter retention.

Peripheral integration includes Timer RD (16-bit × 2 channels with input capture/output compare), Timer RE (real-time clock with compare match), hardware LIN (using Timer RA + UART0), and dual UARTs with clock-synchronous serial I/O capability - all mapped to dedicated pins in the 52-pin LQFP without multiplexing conflicts per functional block.

Key Specifications

Pinout & Package

Package: 52-pin molded-plastic LQFP (PLQP0052JA-A), 0.65 mm pitch, 10 mm × 10 mm body. Pinout validated per Renesas document REJ03B0117-0300, Figure 1.4 and Table 1.5–1.6.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21256SNFP and R5F21246SDFP, the R5F21256SDFP#V2 uniquely combines industrial −40°C operation with 10,000-cycle data flash - making it the sole option among these three for battery-powered outdoor sensors requiring both wide temperature resilience and reliable firmware-parameter updates.

Availability

R5F21256SDFP#V2 is available at Aetrix Electronics and suitable for industrial motor control, home appliance UI panels, office equipment power management, and smart sensor nodes requiring stable component supply across extended lifecycle programs.

Supply support for R5F21256SDFP#V2 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 industrial, automotive, and IoT applications.

The R8C/25 Group, including R5F21256SDFP#V2, was designed for cost-sensitive, high-reliability embedded control in appliances and industrial equipment - emphasizing integrated peripherals, low-power operation, and robust flash endurance.

FAQ

What is the maximum operating frequency of the R5F21256SDFP#V2?

The R5F21256SDFP#V2 supports a maximum crystal frequency of 20 MHz on the XIN pin, achieving a minimum instruction execution time of 50 ns under 3.0–5.5 V supply conditions. Its high-speed on-chip oscillator also provides adjustable frequency output, but external crystal operation delivers highest timing accuracy for real-time control loops in the R5F21256SDFP#V2.

Does the R5F21256SDFP#V2 include hardware LIN support?

Yes, the R5F21256SDFP#V2 integrates a dedicated hardware LIN module compliant with LIN 2.0/2.1 standards, implemented using Timer RA and UART0. This eliminates the need for external LIN transceivers in slave-node applications such as HVAC actuators or lighting controls - a feature confirmed in Renesas document REJ03B0117-0300 Section 1.2.

What is the endurance specification for the data flash in R5F21256SDFP#V2?

The R5F21256SDFP#V2 contains 2 KB of on-chip data flash organized as two 1 KB blocks, rated for 10,000 erase/write cycles per block. This endurance level is specified in Table 1.2 of the R8C/25 Group datasheet (REJ03B0117-0300) and enables reliable storage of calibration data, device configuration, or firmware update metadata across multi-year deployments.

Which package type does the R5F21256SDFP#V2 use?

The R5F21256SDFP#V2 uses the PLQP0052JA-A package: a 52-pin plastic LQFP with 0.65 mm pin pitch and 10 mm × 10 mm body size. This package is explicitly listed in Table 1.4 (Product Information for R8C/25 Group) and validated in Figure 1.4 (Pin Assignments) of the official Renesas datasheet REJ03B0117-0300.

Can the R5F21256SDFP#V2 operate from a 2.2 V supply?

Yes, the R5F21256SDFP#V2 is fully operational at 2.2 V when running at 5 MHz (minimum instruction time 200 ns), as specified in Table 1.2 Electrical Characteristics. This low-voltage capability allows direct integration with single-cell Li-ion or 2×AA battery systems where regulated 3.3 V rails are unavailable - a key design advantage confirmed in the R8C/25 Group datasheet.