Renesas R5F21357CNFP#50

Overview

R5F21357CNFP#50 from Renesas Electronics is a 16-bit R8C CPU core MCU with 48 KB flash program ROM, 4 KB data flash (BGO-enabled), and 4 KB RAM in a 52-pin LQFP package. It delivers 50 ns min instruction execution at 20 MHz (VCC = 2.7–5.5 V), integrates dual 10-bit A/D converters, dual 8-bit D/A outputs, LIN hardware module, and six timer units including complementary PWM for motor control - deployed in consumer audio and appliance power management subsystems.

For engineers reviewing the R5F21357CNFP#50 datasheet, R5F21357CNFP#50 pinout, R5F21357CNFP#50 application, or R5F21357CNFP#50 equivalent, key selection criteria include its N-version temperature range (−20°C to +85°C), background operation data flash, integrated LIN transceiver timing, and 47 CMOS I/O ports with high-current drive capability.

Technical Context

The R5F21357CNFP#50 implements the R8C CPU core with 89 fundamental instructions, 16×16→32-bit multiplier, and multiply-accumulate capability. Its memory map spans 1 Mbyte address space, with fixed interrupt vector table at 0FFDCh–0FFFFh and data flash blocks (1 KB × 4) mapped to 03000h–03FFFh.

It features four independent clock sources - XIN (up to 20 MHz), XCIN (32 kHz), high-speed on-chip oscillator (adjustable), and low-speed on-chip oscillator - with selectable frequency dividers (1/2/4/8/16) and oscillation stop detection. Power modes include standard, wait (3.5 µA @ 3.0 V, 32 kHz), and stop (2.0 µA @ 3.0 V).

Key Specifications

Pinout & Package

Package: 52-pin LQFP (PLQP0052JA-A), 10 mm × 10 mm body, 0.65 mm pin pitch, exposed pad not specified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21357CDFP, the R5F21357CNFP#50 trades extended temperature rating for lower cost and qualification overhead; versus R5F21356CNFP, it provides 16 KB additional flash for field-upgradable features and larger data buffers - critical for audio metadata handling and motor learning algorithms.

Availability

R5F21357CNFP#50 is available at Aetrix Electronics and suitable for audio equipment control, home appliance motor drive, office equipment power management, and consumer HVAC fan control requiring stable component supply across production lifecycles.

Supply support for R5F21357CNFP#50 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 delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The R8C/35C Group, including the R5F21357CNFP#50, was designed for cost-sensitive, low-power embedded control in consumer electronics - emphasizing integration of motor control peripherals, communication interfaces, and robust flash reliability in compact LQFP packages.

FAQ

What is the maximum operating frequency and voltage range supported by the R5F21357CNFP#50?

The R5F21357CNFP#50 operates up to 20 MHz when supplied at 2.7–5.5 V, and supports reduced-frequency operation (5 MHz) down to 1.8 V. Its minimum instruction execution time is 50 ns at 20 MHz and 200 ns at 5 MHz, enabling deterministic real-time response in appliance timing-critical tasks. The R5F21357CNFP#50's voltage detection circuit monitors supply integrity across three configurable thresholds.

Does the R5F21357CNFP#50 support background operation for data flash writes?

Yes, the R5F21357CNFP#50 includes a background operation (BGO) function for its 4 KB data flash (1 KB × 4 blocks), allowing program/erase operations to proceed while the CPU executes application code. This capability is essential for logging operational data or updating calibration parameters in real time without interrupting motor control loops or user interface responsiveness. The R5F21357CNFP#50 implements BGO via dedicated flash control registers and interrupt flags.

How many analog-to-digital converter channels does the R5F21357CNFP#50 integrate, and what is their resolution?

The R5F21357CNFP#50 integrates a single 10-bit successive-approximation A/D converter with 12 input channels (AN0–AN11), supporting sample-and-hold and sweep mode for sequential conversions. It includes dedicated ADTRG trigger input and internal reference voltage options (AVCC or external VREF). This A/D subsystem enables precise sensing of thermistors, potentiometers, and current shunts in audio and appliance applications. The R5F21357CNFP#50's ADC performance is specified across its full −20°C to +85°C operating range.

Can the R5F21357CNFP#50 generate complementary PWM waveforms for three-phase motor control?

Yes, Timer RD in the R5F21357CNFP#50 supports complementary PWM mode with six output pins, generating synchronized three-phase waveforms with programmable dead-time insertion. This feature directly enables brushless DC (BLDC) motor control without external gate drivers. The R5F21357CNFP#50's Timer RD also offers reset-synchronous and triangular/sawtooth modulation variants - all accessible via dedicated SFRs like TRD0IC and TRD1IC.

What is the purpose of the LIN module in the R5F21357CNFP#50, and how is it implemented?

The LIN module in the R5F21357CNFP#50 combines UART0 and Timer RA to implement hardware-assisted LIN 1.3/2.0 communication per ISO 9141-2, eliminating need for external transceivers in slave nodes. It handles baud rate generation, checksum calculation, and frame synchronization autonomously. The R5F21357CNFP#50's LIN implementation supports both master and slave roles, with dedicated interrupt vectors and status flags - simplifying networked appliance subsystem design.