Renesas R5F21258SNFP#X6

Overview

R5F21258SNFP#X6 from Renesas Electronics is a 16-bit single-chip microcontroller in the R8C/25 Group, featuring an R8C/Tiny Series CPU core, 64 KB flash program memory, 3 KB RAM, and dual 1 KB data flash blocks. It operates at up to 20 MHz (50 ns min. instruction time), supports 12-channel 10-bit A/D conversion, hardware LIN via UART0 + Timer RA, and real-time clock functionality in Timer RE. It targets embedded control in consumer appliances requiring compact, low-power, mixed-signal integration.

For engineers reviewing the R5F21258SNFP#X6 datasheet, R5F21258SNFP#X6 pinout, R5F21258SNFP#X6 application, or R5F21258SNFP#X6 equivalent, key selection criteria include its 52-pin LQFP (PLQP0052JA-A) package, -20°C to +85°C N-grade temperature range, integrated LIN transceiver support, dual data flash blocks for EEPROM emulation, and 2.2–5.5 V supply operation with sub-µA stop-mode current.

Technical Context

The R5F21258SNFP#X6 implements the R8C/Tiny CPU core with 89 fundamental instructions and 1 Mbyte address space, enabling efficient C-language execution and deterministic real-time response. Its peripheral set includes two UARTs, one I²C interface, one clock-synchronous serial I/O with chip select, eight 8-bit I/O ports (41 total I/O pins), and four independent timer modules (RA, RB, RD, RE) supporting input capture, output compare, PWM, and RTC functions.

It integrates three clock generation circuits: XIN-based crystal/resonator oscillator (20 MHz max), high-speed on-chip oscillator with frequency adjustment, and 32 kHz XCIN-based RTC oscillator with oscillation stop detection. The device uses on-chip power-on reset and voltage detection circuits, and supports wait/stop modes with typical currents of 2.0 µA and 0.7 µA respectively at 3.0 V.

Key Specifications

Pinout & Package

Package: 52-pin LQFP (PLQP0052JA-A), 0.65 mm pitch, 10 mm × 10 mm body, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21256SNFP, R5F21258SNFP#X6 offers 32 KB more program space for enhanced feature sets and field-upgradable logic; compared with R5F21248SNFP, it adds dual 1 KB data flash blocks enabling robust parameter storage without external components or I²C bus contention.

Availability

R5F21258SNFP#X6 is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, consumer audio systems, and smart power outlets requiring stable component supply and long-term production continuity.

Supply support for R5F21258SNFP#X6 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 automotive, industrial, and IoT markets.

The R8C/25 Group, including R5F21258SNFP#X6, was designed for cost-sensitive, low-power embedded control in consumer electronics - emphasizing integrated peripherals, flash flexibility, and minimal external component count.

FAQ

What is the maximum operating frequency and corresponding supply voltage range for R5F21258SNFP#X6?

R5F21258SNFP#X6 achieves a maximum operating frequency of 20 MHz at VCC = 3.0–5.5 V. At lower frequencies (10 MHz, 5 MHz), it supports reduced supply voltages down to 2.2 V, enabling flexible power architecture design in battery-powered or wide-input applications. This graded voltage-frequency specification is confirmed in Table 1.2 of the R8C/25 Group datasheet.

Does R5F21258SNFP#X6 include hardware support for LIN communication, and how is it implemented?

Yes, R5F21258SNFP#X6 includes dedicated hardware LIN support via its UART0 peripheral combined with Timer RA, as specified in the R8C/25 Group documentation. This enables full LIN 2.0/2.1 protocol handling without software bit-banging, reducing CPU load and ensuring timing compliance. The implementation requires no external transceiver for basic node functionality.

How many A/D converter channels does R5F21258SNFP#X6 support, and what is their resolution?

R5F21258SNFP#X6 integrates a single 10-bit successive-approximation A/D converter with 12 analog input channels (AN0–AN11), as documented in Tables 1.1 and 1.2. All channels share the same reference voltage (VREF or AVCC), and conversion is controlled via dedicated registers - enabling simultaneous monitoring of multiple sensors in appliance control applications.

What package type and pin count does R5F21258SNFP#X6 use, and is it RoHS-compliant?

R5F21258SNFP#X6 uses the PLQP0052JA-A package: a 52-pin LQFP with 0.65 mm pitch and 10 mm × 10 mm body. This package is explicitly listed in Table 1.4 for the R8C/25 Group and is RoHS-compliant per Renesas' environmental compliance statements in the document revision notice.

What is the data flash endurance rating for R5F21258SNFP#X6, and how is it structured?

R5F21258SNFP#X6 contains two independent 1 KB data flash blocks, each rated for 10,000 write/erase cycles, as specified in Table 1.2. This structure enables wear-leveling across blocks for extended nonvolatile storage life - critical for storing calibration data, usage logs, or user preferences in long-lifecycle consumer products.