Renesas R5F21244SDFP#X6

Overview

R5F21244SDFP#X6 from Renesas Electronics is a 16-bit single-chip microcontroller in the R8C/24 Group, featuring an R8C/Tiny Series CPU core, 16 KB flash ROM, 1 KB RAM, and operation over −40°C to +85°C. It integrates a 10-bit 12-channel ADC, dual UARTs, I²C interface, hardware LIN module, four 8-/16-bit timers, and low-power stop mode (0.7 µA). It targets embedded control in industrial sensors and appliance motor drives.

For engineers reviewing the R5F21244SDFP#X6 datasheet, R5F21244SDFP#X6 pinout, R5F21244SDFP#X6 application, or R5F21244SDFP#X6 equivalent, key selection criteria include its D-grade temperature range, 52-pin LQFP package with PLQP0052JA-A footprint, absence of on-chip data flash (distinguishing it from R8C/25 variants), and support for LIN bus via UART0+Timer RA.

Technical Context

The R5F21244SDFP#X6 implements the R8C/Tiny CPU core with 89 fundamental instructions and executes at 50 ns minimum instruction time (20 MHz XIN, 3.0–5.5 V). Its memory map spans 1 Mbyte, with flash programmable at VCC = 2.7–5.5 V and rated for 1,000 erase/write cycles.

Peripheral integration includes two UART channels (UART0/UART1), one I²C bus interface, one clock-synchronous serial I/O with chip select, a hardware LIN module tied to Timer RA and UART0, and Timer RE providing real-time clock functionality with compare match.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21244SNFP, the R5F21244SDFP#X6 provides guaranteed operation down to −40°C - critical for outdoor or unheated industrial enclosures - while R5F21254SDFP adds data flash for robust field updates but increases code size overhead and write latency.

Availability

R5F21244SDFP#X6 is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance motor drives, office equipment keypad interfaces, and audio equipment power management requiring stable component supply across extended temperature ranges.

Supply support for R5F21244SDFP#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 industrial, automotive, and infrastructure markets.

The R8C/24 Group, including R5F21244SDFP#X6, was designed for cost-sensitive, low-power embedded control in consumer and industrial appliances - emphasizing integration of LIN, ADC, and timers in compact LQFP packages.

FAQ

What is the maximum operating frequency and corresponding supply voltage for R5F21244SDFP#X6?

The R5F21244SDFP#X6 achieves a minimum instruction execution time of 50 ns at 20 MHz, requiring VCC = 3.0 to 5.5 V. At lower frequencies (10 MHz, 5 MHz), it supports reduced supply voltages down to 2.2 V. This voltage/frequency scaling allows flexible power-performance trade-offs in battery-powered or energy-constrained R5F21244SDFP#X6 designs.

Does R5F21244SDFP#X6 include on-chip data flash memory?

No, the R5F21244SDFP#X6 belongs to the R8C/24 Group and contains only program flash ROM (16 KB) and RAM (1 KB), with no embedded data flash. Data flash is exclusive to the R8C/25 Group (e.g., R5F21254SDFP). Firmware must use EEPROM emulation in RAM or external storage if nonvolatile parameter retention is needed for R5F21244SDFP#X6.

Which pins on R5F21244SDFP#X6 support hardware LIN bus communication?

The R5F21244SDFP#X6 implements hardware LIN using UART0 (RXD0/TXD0 pins) combined with Timer RA outputs (TRAIO/TRAO). TRAO provides precise timing for LIN dominant/recessive bit generation, while UART0 handles protocol framing. This integrated approach eliminates the need for external LIN transceivers in slave-node applications using R5F21244SDFP#X6.

What is the ADC reference configuration for R5F21244SDFP#X6?

The R5F21244SDFP#X6 uses an external reference voltage applied to the VREF pin (Pin 44) for its 10-bit, 12-channel ADC. AVCC and AVSS must be decoupled with capacitors, and VREF must be stable and within the analog supply range. Internal VCC referencing is not supported - accurate measurements depend on clean, regulated VREF supplied externally to the R5F21244SDFP#X6.

How does the reset circuit function on R5F21244SDFP#X6?

The R5F21244SDFP#X6 features an active-low RESET pin (Pin 8) with internal pull-up. A valid reset requires a low pulse ≥100 ns. External reset supervisors or RC networks are recommended for reliable power-on and brown-out recovery. The on-chip power-on reset (POR) circuit activates automatically during VCC ramp-up, ensuring deterministic initialization before code execution begins on R5F21244SDFP#X6.