Renesas R5F21282SNSP#U0

Overview

R5F21282SNSP from Renesas Electronics is a 16-bit R8C/28 Group single-chip microcontroller in 20-pin LSSOP package, featuring an 8 KB flash program memory, 512 bytes RAM, 10-bit 4-channel ADC, UART0/UART1 serial interfaces, and hardware LIN support via Timer RA and UART0. It operates from 2.2 V to 5.5 V at up to 20 MHz and targets embedded control in consumer appliances and industrial equipment.

For engineers reviewing the R5F21282SNSP datasheet, R5F21282SNSP pinout, R5F21282SNSP application, or R5F21282SNSP equivalent, key selection criteria include its N-version temperature range (–20°C to +85°C), absence of on-chip data flash (distinguishing it from R8C/29 Group), 20-pin PLSP0020JB-A LSSOP footprint, and integrated real-time clock capability via Timer RE in N/D versions.

Technical Context

The R5F21282SNSP implements the R8C CPU core with 89 fundamental instructions and executes at minimum 50 ns per instruction (at 20 MHz, VCC = 3.0–5.5 V). Its memory architecture provides 1 Mbyte address space, with fixed interrupt vector table at 0FFDCh–0FFFFh and program ROM mapped starting at 0E000h for the 8 KB configuration.

Peripheral integration includes Timer RA/RB (8-bit × 2), Timer RC (16-bit with input capture/output compare), Timer RE (real-time clock + compare match in N/D versions), two UARTs, one I²C bus interface, one clock synchronous serial I/O with chip select, and hardware LIN module using UART0 and Timer RA - all controlled via dedicated SFRs in the 00000h–002FFh address range.

Key Specifications

Pinout & Package

Package: 20-pin molded-plastic LSSOP (PLSP0020JB-A), 0.65 mm pitch, exposed pad not present, JEDEC MS-013AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21282SNSP, R5F21284SNSP offers double program memory without changing layout or firmware architecture, while R5F21292SNSP adds dual 1 KB data flash blocks for robust parameter logging - both retain full pin and code compatibility but differ in memory topology and endurance ratings.

Availability

R5F21282SNSP is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, and office equipment motor control requiring stable component supply and long-term production continuity.

Supply support for R5F21282SNSP 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 formed in 2010 through merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices.

The R8C/28 Group, including R5F21282SNSP, was designed for cost-sensitive, low-power embedded control in consumer and industrial applications where compact size, integrated peripherals, and proven reliability are critical.

FAQ

What is the maximum operating frequency and supply voltage range for the R5F21282SNSP?

The R5F21282SNSP supports a maximum operating frequency of 20 MHz at VCC = 3.0–5.5 V. At lower frequencies, it operates down to VCC = 2.2 V (5 MHz), enabling flexible power design. The N-version rating is –20°C to +85°C ambient, and all electrical characteristics-including minimum instruction execution time of 50 ns-are specified within these ranges. R5F21282SNSP does not support the K-version's 125°C rating or D-version's –40°C lower limit.

Does the R5F21282SNSP include on-chip data flash memory?

No, the R5F21282SNSP belongs to the R8C/28 Group and contains only 8 KB of program flash memory with no dedicated data flash. Data retention relies on program flash reprogramming or external EEPROM. In contrast, R8C/29 Group parts like R5F21292SNSP integrate 1 KB × 2 data flash blocks rated for 10,000 erase/write cycles. R5F21282SNSP's flash endurance is 100 cycles for program memory.

Which pins on the R5F21282SNSP support hardware LIN communication?

R5F21282SNSP implements hardware LIN using UART0 and Timer RA, with dedicated pins P1_4 (TXD0) and P1_5 (RXD0) for LIN bus signaling, and P1_7 (TRAIO) for LIN header detection and synchronization. This configuration meets LIN 2.0/2.1 physical layer requirements without external transceiver components. The R5F21282SNSP datasheet confirms this mapping in Table 1.5 and Section 1.2 under "LIN module".

Can the R5F21282SNSP operate from a 32 kHz external crystal for real-time clock functions?

Yes - the R5F21282SNSP supports 32 kHz crystal operation on XCIN/XCOUT pins (pins 6 and 4) for Timer RE-based real-time clock functionality, but only in N and D versions. The R5F21282SNSP is an N-version part, so XCIN/XCOUT is functional and enables low-power RTC operation with typical 2.0 µA wait-mode current (VCC = 3.0 V, f(XCIN) = 32 kHz). J/K versions disable this feature.

What is the pin-compatible upgrade path from R5F21282SNSP to higher memory capacity?

R5F21284SNSP is a direct pin-compatible upgrade offering 16 KB flash and 1 KB RAM in the same 20-pin LSSOP (PLSP0020JB-A) package. No PCB changes are required; firmware binary compatibility is maintained at the instruction-set level. Both share identical peripheral registers, interrupt vectors, and timing characteristics. R5F21282SNSP users can scale firmware complexity without redesigning hardware or requalifying the board layout.