Renesas R5F21357CNFP#10

Overview

R5F21357CNFP#10 from Renesas Electronics is a 16-bit R8C CPU core MCU with 48 KB flash program memory, 4 KB data flash (BGO-enabled), and 4 KB RAM, operating at up to 20 MHz (VCC = 2.7–5.5 V) for embedded control in consumer audio and office equipment.

For engineers reviewing the R5F21357CNFP#10 datasheet, R5F21357CNFP#10 pinout, R5F21357CNFP#10 application, or R5F21357CNFP#10 equivalent, key selection criteria include its 52-pin LQFP package, integrated LIN hardware module (using Timer RA + UART0), 10-bit × 12-channel ADC with sample-and-hold, dual 8-bit DAC outputs, and low-power stop mode (2.0 µA @ 3.0 V).

Technical Context

The R5F21357CNFP#10 implements the R8C CPU core with 89 fundamental instructions, 16×16→32-bit multiplier, and multiply-accumulate capability. It supports single-chip operation across a 1 Mbyte address space and executes instructions in as little as 50 ns at 20 MHz.

Its peripheral set includes four independent timers (RA–RE), three UART/serial interfaces (UART0–2 with I²C mode), SSU, LIN module, 10-bit ADC, dual 8-bit DACs, two comparators, and voltage detection circuitry with programmable levels - all managed via dedicated SFRs mapped to fixed memory addresses.

Key Specifications

Pinout & Package

52-pin LQFP package (PLQP0052JA-A), 10 mm × 10 mm body, 0.65 mm pin pitch, exposed pad not specified. Pin functions include 47 CMOS I/O ports (with selectable pull-up), 1 input-only port (P4_2), and dedicated peripheral pins for UART, LIN, timers, ADC, DAC, and clock sources.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21356CNFP and R5F21358CNFP, the R5F21357CNFP#10 delivers optimal balance of code space (48 KB), data retention (4 KB data flash), and peripheral integration for mid-tier consumer control - avoiding over-provisioning while retaining headroom for feature expansion.

Availability

R5F21357CNFP#10 is available at Aetrix Electronics and suitable for audio equipment control, office equipment motor control, consumer appliance UI, and industrial sensor hub applications requiring stable component supply and long-term production continuity.

Supply support for R5F21357CNFP#10 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 the R5F21357CNFP#10, was designed for cost-sensitive, low-power embedded control in consumer electronics - emphasizing EMI/EMS robustness, integrated analog peripherals, and flexible clocking for rapid time-to-market.

FAQ

What is the maximum operating frequency and supply voltage range for the R5F21357CNFP#10?

The R5F21357CNFP#10 operates at up to 20 MHz when supplied with 2.7–5.5 V, and supports reduced-frequency operation down to 5 MHz at 1.8–5.5 V. This dual-voltage flexibility allows use in both legacy 5 V systems and modern low-power 3.3 V designs without external level-shifting. The minimum instruction execution time is 50 ns under full-speed conditions.

Does the R5F21357CNFP#10 support hardware LIN communication, and how is it implemented?

Yes, the R5F21357CNFP#10 integrates a hardware LIN module using Timer RA and UART0. It supports LIN 2.0/2.1 frame formatting, checksum calculation, and automatic sync-break detection - enabling direct connection to a LIN transceiver without software bit-banging. This implementation reduces CPU load by >70% compared to UART-based bit-banged LIN stacks.

How does the background operation (BGO) function work in the R5F21357CNFP#10 data flash?

The R5F21357CNFP#10 data flash supports true background operation: while a block erase or program operation executes in the 1 KB data flash banks (A–D), the CPU can simultaneously fetch and execute code from program ROM or access RAM. This enables live firmware updates and parameter storage without application interruption - critical for fail-safe consumer device operation.

What are the low-power modes available on the R5F21357CNFP#10, and what is the typical current draw in each?

The R5F21357CNFP#10 offers wait mode (3.5 µA @ 3.0 V, 32 kHz XCIN active) and stop mode (2.0 µA @ 3.0 V, all clocks halted except optional 32 kHz oscillator). Both modes retain RAM and register contents. These currents are measured with all peripherals disabled and I/O pins configured as high-impedance inputs - meeting stringent battery-life requirements for remote controls and portable appliances.

Can the R5F21357CNFP#10's 10-bit ADC perform simultaneous sampling across multiple channels?

No, the R5F21357CNFP#10's 10-bit ADC does not support true simultaneous sampling. It uses a single SAR converter with multiplexed inputs and supports sweep mode to sequentially sample up to 12 channels in a defined order, with conversion times as low as 1.2 µs per channel. For synchronized acquisition, external analog front-end circuitry is required.