Renesas R5F21357CDFP#X4

Overview

R5F21357CDFP#X4 from Renesas Electronics is a 16-bit R8C CPU core microcontroller with 48 KB flash program ROM, 4 KB data flash (BGO-enabled), and 4 KB RAM, operating at up to 20 MHz (VCC = 2.7–5.5 V) for real-time motor control and appliance UI subsystems.

For engineers reviewing the R5F21357CDFP#X4 datasheet, R5F21357CDFP#X4 pinout, R5F21357CDFP#X4 application, or R5F21357CDFP#X4 equivalent, key selection criteria include its 12-channel 10-bit ADC, dual 8-bit DAC outputs, LIN hardware module (using Timer RA + UART0), and -40°C to +85°C industrial temperature rating.

Technical Context

The R5F21357CDFP#X4 implements the R8C CPU core with 89 fundamental instructions, 16×16→32-bit multiplier, and multiply-accumulate capability. Its memory map spans 1 Mbyte, with fixed interrupt vector table at 0FFDCh–0FFFFh and data flash blocks at 03000h–03FFFh.

It integrates four independent timer units (RA–RD plus RE), supporting PWM generation (up to 6-pin complementary three-phase), input capture, and real-time clock functions. Serial connectivity includes UART0/1/2, I²C-bus (shared with SSU), and hardware LIN protocol acceleration.

Key Specifications

Pinout & Package

52-pin LQFP package (PLQP0052JA-A), 10 mm × 10 mm body, 0.65 mm lead 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 R5F21357CNFP, the R5F21357CDFP#X4 provides guaranteed operation down to -40°C for harsh environments; versus R5F21358CDFP, it trades 16 KB ROM and 2 KB RAM for lower unit cost and reduced flash programming time in volume production.

Availability

R5F21357CDFP#X4 is available at Aetrix Electronics and suitable for home appliance motor control, industrial HMI subsystems, audio equipment power management, and consumer device real-time clock applications requiring stable component supply across extended temperature ranges.

Supply support for R5F21357CDFP#X4 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 R5F21357CDFP#X4, was designed for cost-sensitive, real-time embedded systems in white goods, office automation, and audio equipment - emphasizing integrated peripherals, low power, and robust EMI/EMS performance.

FAQ

What is the maximum operating frequency and supply voltage range for the R5F21357CDFP#X4?

The R5F21357CDFP#X4 operates at up to 20 MHz when supplied with 2.7–5.5 V, and supports reduced-frequency operation at 5 MHz down to 1.8 V. This dual-voltage/frequency capability enables flexible power management in battery-powered and line-powered applications alike, with typical active current draw of 6.5 mA at 5.0 V/20 MHz.

Does the R5F21357CDFP#X4 support in-system programming of its data flash memory?

Yes, the R5F21357CDFP#X4 supports background operation (BGO) for data flash, allowing erase and write operations to proceed concurrently with CPU program execution. Its 4 KB data flash is organized into four 1 KB blocks, each rated for 10,000 erase/write cycles, enabling robust parameter storage and firmware update staging without system interruption.

How many analog input channels does the R5F21357CDFP#X4 ADC support, and what is its resolution?

The R5F21357CDFP#X4 integrates a 10-bit successive-approximation ADC with 12 dedicated analog input channels (AN0–AN11), plus sample-and-hold and hardware sweep mode. This configuration supports simultaneous sampling of multiple sensors - such as motor phase currents, temperature thermistors, and audio line-in signals - with ±1 LSB integral nonlinearity over the full industrial temperature range.

What peripheral resources enable hardware LIN bus communication on the R5F21357CDFP#X4?

The R5F21357CDFP#X4 implements a dedicated hardware LIN module combining Timer RA for baud rate generation and break detection with UART0 for frame formatting and checksum calculation. This offloads LIN protocol handling from the CPU, ensuring deterministic timing for automotive body electronics applications compliant with LIN 2.0/2.1 specifications.

What are the low-power operating modes available on the R5F21357CDFP#X4, and what is the minimum current consumption?

The R5F21357CDFP#X4 offers wait mode (3.5 µA @ 3.0 V / 32 kHz XCIN) and stop mode (2.0 µA @ 3.0 V), both retaining RAM content and selected register states. These modes leverage the low-speed on-chip oscillator and voltage detection circuitry to minimize energy use in standby - critical for battery-backed real-time clock and remote sensor wake-up applications.