Renesas R5F21357CNFP#V0

Overview

R5F21357CNFP#V0 from Renesas Electronics is a 16-bit R8C CPU core MCU with 48 KB flash program ROM, 4 KB data flash (BGO-capable), and 4 KB RAM, operating at up to 20 MHz (2.7–5.5 V) or 5 MHz (1.8–5.5 V), used in consumer audio equipment and office automation control systems.

For engineers reviewing the R5F21357CNFP#V0 datasheet, R5F21357CNFP#V0 pinout, R5F21357CNFP#V0 application, or R5F21357CNFP#V0 equivalent, key selection criteria include its 12-channel 10-bit ADC, dual 8-bit DACs, LIN hardware module (using Timer RA + UART0), real-time clock (Timer RE), and 52-pin LQFP package with industrial temperature range (−20°C to +85°C).

Technical Context

The R5F21357CNFP#V0 implements the R8C CPU core with 89 fundamental instructions, 16×16→32-bit multiplier, and multiply-accumulate capability. It supports four clock sources: XIN/XOUT (up to 20 MHz), XCIN/XCOUT (32 kHz), high-speed on-chip oscillator (adjustable), and low-speed on-chip oscillator.

Peripheral integration includes Timer RD (dual 16-bit with 6-pin PWM, complementary & reset-synchronous modes), UART0/1/2 (with I²C mode on UART2), SSU, LIN module, DTC (1 channel, 33 activation sources), and voltage detection circuit with programmable levels (VDD monitor + VDET3).

Key Specifications

Pinout & Package

Package: 52-pin LQFP (PLQP0052JA-A), 10 mm × 10 mm body, 0.65 mm lead pitch, RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21356CNFP and R5F21358CNFP, the R5F21357CNFP strikes a balance between memory capacity and cost-offering sufficient headroom for mid-tier appliance firmware while avoiding over-provisioning seen in the 64 KB variant.

Availability

R5F21357CNFP#V0 is available at Aetrix Electronics and suitable for consumer audio equipment, office automation controllers, and industrial human-machine interfaces requiring stable component supply across multi-year production cycles.

Supply support for R5F21357CNFP#V0 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/35C Group, including R5F21357CNFP#V0, was designed for cost-sensitive, low-power embedded control in consumer electronics-emphasizing EMI/EMS robustness, integrated analog peripherals, and field-upgradable flash.

FAQ

What is the maximum operating frequency and supply voltage range for the R5F21357CNFP#V0?

The R5F21357CNFP#V0 operates at up to 20 MHz when supplied with 2.7–5.5 V, and at up to 5 MHz down to 1.8 V. Its minimum instruction execution time is 50 ns at 20 MHz/2.7–5.5 V, enabling deterministic real-time response in audio and motor control loops. The device maintains full functionality across this voltage range without configuration changes.

Does the R5F21357CNFP#V0 support hardware LIN communication, and how is it implemented?

Yes, the R5F21357CNFP#V0 integrates a hardware LIN module using Timer RA and UART0 per the datasheet. This implementation complies with LIN 2.1 specifications and handles break field detection, sync field, and identifier handling in hardware-reducing CPU overhead and ensuring timing accuracy for automotive body electronics and appliance networks.

How does the Background Operation (BGO) function work in the R5F21357CNFP#V0 data flash?

The R5F21357CNFP#V0 supports BGO on its 4 KB data flash (four 1 KB blocks), allowing CPU code execution from program ROM while simultaneously erasing or programming a data flash block. This enables seamless firmware parameter updates or data logging without halting real-time tasks-a key requirement for uninterrupted audio playback or motor control.

What are the real-time clock capabilities of the R5F21357CNFP#V0, and how is it powered during low-power modes?

The R5F21357CNFP#V0 implements real-time clock functionality in Timer RE, supporting seconds/minutes/hours/days-of-week counting and output compare interrupts. When powered by the 32 kHz XCIN/XCOUT oscillator, it remains active in wait mode (3.5 µA) and stop mode (2.0 µA), enabling accurate timekeeping with minimal battery drain in portable devices.

Can the R5F21357CNFP#V0's ADC operate in sweep mode, and what is its effective sampling rate?

Yes, the R5F21357CNFP#V0's 10-bit ADC supports sweep mode across all 12 channels (AN0–AN11). With a maximum conversion time of 1.5 µs per channel and automatic channel sequencing, it achieves an effective aggregate sampling rate of ~667 kSPS in continuous sweep-sufficient for multi-sensor monitoring in HVAC or appliance control without CPU intervention.