Renesas R5F21292SNSP#U0

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, 20-pin LSSOP package, and operating temperature range of −20°C to +85°C (N version), used in consumer appliance control and industrial sensor interface applications.

For engineers reviewing the R5F21292SNSP datasheet, R5F21292SNSP pinout, R5F21292SNSP application, or R5F21292SNSP equivalent, key selection criteria include on-chip data flash endurance (10,000 cycles), real-time clock support via Timer RE, LIN bus hardware implementation, 10-bit 4-channel ADC, and low-power stop mode current (0.7 µA at 3.0 V).

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). It integrates three clock generation circuits: XIN-based crystal/resonator oscillator, high-speed/low-speed on-chip oscillators (with frequency adjustment), and XCIN/XCOUT 32 kHz circuit (N/D version only).

Peripheral integration includes UART0 (clock sync serial I/O + UART), UART1 (UART-only), I²C bus interface, hardware LIN module (using Timer RA and UART0), Timer RA/RB (8-bit × 2), Timer RC (16-bit input capture/output compare), Timer RE (real-time clock + compare match), and 10-bit 4-channel A/D converter with internal reference voltage input (VREF).

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 R5F21292SDSP, the R5F21292SNSP offers lower temperature rating but same data flash capability; compared with R5F21282SNSP, it adds 2 KB data flash with 10,000-cycle endurance at the cost of slightly higher program memory erase count limit (1,000 vs. 10,000).

Availability

R5F21292SNSP is available at Aetrix Electronics and suitable for home appliance control, industrial sensor interface, and automotive body electronics requiring stable component supply across long production 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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and consumer markets.

The R8C/29 Group, including R5F21292SNSP, was designed for cost-sensitive, low-power embedded control applications requiring integrated data storage, LIN connectivity, and analog signal acquisition in compact 20-pin packages.

FAQ

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

The R5F21292SNSP achieves a minimum instruction execution time of 50 ns at 20 MHz XIN frequency, requiring VCC = 3.0–5.5 V. At lower frequencies (e.g., 10 MHz), it operates down to 2.7 V, and at 5 MHz, down to 2.2 V - enabling flexible power supply design across battery- and line-powered applications.

Does the R5F21292SNSP support hardware real-time clock functionality?

Yes, the R5F21292SNSP implements real-time clock (RTC) functionality through Timer RE, but only when paired with the 32 kHz XCIN/XCOUT crystal oscillator circuit - which is available exclusively on N and D version variants like R5F21292SNSP. The J and K versions omit XCIN/XCOUT and support compare match only.

How many times can the data flash in the R5F21292SNSP be erased and rewritten?

The data flash in the R5F21292SNSP is rated for 10,000 erase/write cycles per block (1 KB × 2 blocks), significantly exceeding the 1,000-cycle endurance of its program flash. This allows robust field firmware updates and persistent parameter storage in applications such as appliance calibration and usage logging.

Is the R5F21292SNSP pin-compatible with other members of the R8C/29 Group?

Yes, all R8C/29 Group devices in the PLSP0020JB-A 20-pin LSSOP package - including R5F21292SNSP, R5F21294SNSP, and R5F21292SDSP - share identical pin assignments and electrical characteristics. Firmware porting between variants requires only memory map and configuration register adjustments.

What peripheral interfaces does the R5F21292SNSP provide for sensor connectivity?

The R5F21292SNSP provides four dedicated analog inputs (AN8–AN11) for its 10-bit A/D converter, I²C bus interface for digital sensors (e.g., temperature, humidity), UART0/UART1 for serial sensor modules, and hardware LIN for automotive-grade distributed sensors - all accessible via its 20-pin LSSOP footprint without external level shifters or protocol translators.