Renesas R5F21292SNSP#W4

Overview

R5F21292SNSP from Renesas Electronics is a 16-bit R8C/29 Group single-chip microcontroller with 8 KB program flash, 1 KB × 2 data flash, 512 bytes RAM, and 20-pin LSSOP (PLSP0020JB-A) packaging. It integrates an R8C CPU core, 10-bit 4-channel ADC, UART0/UART1, I²C interface, hardware LIN module, and real-time clock-capable Timer RE - deployed in consumer appliance control and industrial sensor nodes requiring low-voltage operation (2.2–5.5 V) and extended temperature range (−20 to +85°C).

For engineers reviewing the R5F21292SNSP datasheet, R5F21292SNSP pinout, R5F21292SNSP application, or R5F21292SNSP equivalent, key selection criteria include its dual-block data flash endurance (10,000 erase/write cycles), on-chip XCIN/XCOUT 32 kHz RTC support (N/D version), integrated LIN physical layer timing, and 20-pin LSSOP footprint compatibility with legacy R8C/28 designs.

Technical Context

The R5F21292SNSP implements the R8C CPU core with 89 fundamental instructions and executes at 50 ns minimum instruction time (20 MHz XIN, 3.0–5.5 V). Its memory architecture separates 8 KB program ROM from two independent 1 KB data flash blocks, enabling field-updatable configuration storage without disturbing application code.

Peripheral integration includes UART0 (clock-synchronous serial I/O + UART), UART1 (UART-only), I²C bus interface, hardware LIN (using Timer RA + UART0), and Timer RE with real-time clock and compare-match functions - all controlled via dedicated SFRs mapped to addresses 00000h–002FFh in the 1 Mbyte address space.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21292SNSP, R5F21282SNSP removes data flash to reduce cost and complexity for static configurations, while R5F21294SNSP scales program memory to accommodate richer feature sets - both maintain identical thermal, timing, and interface behavior in the same LSSOP package.

Availability

R5F21292SNSP is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, office equipment, and automotive body electronics requiring stable component supply across extended product lifecycles.

Supply support for R5F21292SNSP 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 industrial, automotive, and IoT applications.

The R8C/29 Group, including R5F21292SNSP, was designed for cost-sensitive, low-power embedded control in consumer and industrial equipment - emphasizing integrated peripherals, flash flexibility, and robust operation across commercial temperature ranges.

FAQ

What is the maximum operating frequency and corresponding supply voltage for R5F21292SNSP?

The R5F21292SNSP achieves a minimum instruction execution time of 50 ns at 20 MHz XIN clock frequency, requiring VCC = 3.0 to 5.5 V. At lower frequencies (e.g., 10 MHz), it operates down to 2.7 V, and at 5 MHz, down to 2.2 V - making R5F21292SNSP suitable for wide-input-voltage battery-powered systems.

Does R5F21292SNSP support real-time clock functionality with battery backup?

Yes - R5F21292SNSP includes Timer RE with real-time clock capability when paired with a 32 kHz crystal on XCIN/XCOUT pins. This feature is available in N and D versions (including R5F21292SNSP), enabling calendar-time stamping and periodic wake-up from stop mode without external RTC ICs.

How many erase/write cycles are guaranteed for the data flash in R5F21292SNSP?

The data flash in R5F21292SNSP is rated for 10,000 erase/write cycles per 1 KB block. This endurance specification applies separately to each of the two data flash blocks, allowing independent wear leveling and long-term reliability in field-updatable parameter storage applications.

Is R5F21292SNSP pin-compatible with other R8C/29 Group MCUs?

Yes - all R8C/29 Group devices, including R5F21292SNSP, share identical 20-pin LSSOP (PLSP0020JB-A) packaging and pin assignments. Firmware and hardware designs can scale across memory variants (e.g., R5F21294SNSP) without PCB changes, provided peripheral usage aligns with the specific variant's capabilities.

What LIN protocol versions does the hardware LIN module in R5F21292SNSP support?

The hardware LIN module in R5F21292SNSP implements LIN 2.0 and LIN 2.1 physical layer timing requirements using UART0 and Timer RA. It handles baud rate generation, sync field detection, and checksum calculation in hardware - supporting standard LIN slave node operation without software bit-banging overhead.