Renesas R5F21294SNSP#U0

Overview

R5F21294SNSP from Renesas Electronics is a 16-bit R8C/29 Group single-chip microcontroller with 16 KB program flash, 2 KB on-chip data flash (1 KB × 2 blocks), 1 KB RAM, and 20-pin LSSOP package. It integrates an R8C CPU core, 10-bit 4-channel ADC, dual UARTs, I²C interface, hardware LIN module, four 8/16-bit timers, and real-time clock functionality. It targets embedded control in consumer appliances and industrial equipment operating from 2.2–5.5 V.

For engineers reviewing the R5F21294SNSP datasheet, R5F21294SNSP pinout, R5F21294SNSP application, or R5F21294SNSP equivalent, key selection considerations include its 20-pin LSSOP footprint, -20 to +85°C temperature grade (N version), 100 ns minimum instruction cycle at 10 MHz, integrated data flash for parameter storage, and hardware LIN support via Timer RA and UART0.

Technical Context

The R5F21294SNSP implements the R8C CPU core with 89 fundamental instructions and a 20-bit address space supporting up to 1 Mbyte. Its memory subsystem includes separate program ROM and dual-block data flash-enabling field-updatable configuration storage without erasing application code.

Peripheral integration centers on deterministic real-time control: Timer RC provides input capture/output compare for motor timing; Timer RE delivers real-time clock and compare match (N/D versions); and the hardware LIN module offloads protocol handling from firmware using UART0 and Timer RA resources.

Key Specifications

Pinout & Package

Package: 20-pin molded-plastic LSSOP (PLSP0020JB-A), 0.65 mm pitch, body size 7.6 × 4.4 mm, moisture sensitivity level MSL3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21294SNSP, R5F21294SDSP offers extended temperature tolerance without changing PCB layout, while R5F21296JSP provides double the program memory and extra RAM for feature-rich implementations - both retain identical pinout, peripheral mapping, and instruction set compatibility.

Availability

R5F21294SNSP is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, and automotive body electronics requiring stable component supply across long production lifecycles.

Supply support for R5F21294SNSP 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/29 Group, including R5F21294SNSP, was designed for cost-sensitive, low-power embedded control applications demanding integrated data flash, LIN connectivity, and robust analog peripherals in compact packages.

FAQ

What is the maximum operating frequency and corresponding supply voltage for R5F21294SNSP?

R5F21294SNSP supports a maximum operating frequency of 20 MHz at VCC = 3.0–5.5 V. At lower frequencies, it operates down to 2.2 V (5 MHz), enabling battery-powered designs with brown-out resilience. The minimum instruction execution time is 50 ns under these conditions, confirmed in Renesas documentation REJ03B0169-0210.

Does R5F21294SNSP include hardware support for LIN communication?

Yes, R5F21294SNSP integrates a dedicated hardware LIN 2.0 module that uses UART0 and Timer RA resources to handle frame generation, checksum calculation, and schedule table management without CPU intervention. This is explicitly documented in the R8C/29 Group specification tables and block diagram.

How many write/erase cycles does the on-chip data flash in R5F21294SNSP support?

The on-chip data flash in R5F21294SNSP supports 10,000 write/erase cycles, as specified in Table 1.2 of the R8C/29 Group datasheet (REJ03B0169-0210). This endurance rating applies specifically to the two 1 KB data flash blocks, distinct from the 1,000-cycle rating for program ROM.

What is the operating temperature range for R5F21294SNSP?

R5F21294SNSP is an N-version device with an operating ambient temperature range of -20°C to +85°C, as defined in Tables 1.1 and 1.2 of the R8C/29 Group datasheet. This classification is encoded in the part number suffix "N" and verified in the product information tables.

Can R5F21294SNSP operate from a 32.768 kHz crystal for real-time clock functionality?

Yes, R5F21294SNSP supports 32.768 kHz crystal operation via the XCIN/XCOUT pins for Timer RE real-time clock functionality - but only in N and D versions. This capability is confirmed in the "Clock generation circuits" section and Table 1.1, and the pin functions table explicitly lists XCIN/XCOUT for N/D variants.