Renesas R5F21294JSP#U0

Overview

R5F21294JSP#U0 from Renesas Electronics is a 16-bit R8C/29 Group single-chip microcontroller with 16 KB program flash, 2 KB data flash (1 KB × 2 blocks), 1 KB RAM, and operation at -40 to +85°C. It integrates UART0/UART1, I²C bus interface, hardware LIN module, 10-bit 4-channel ADC, and four 8-/16-bit timers - deployed in industrial control panels and automotive body electronics requiring embedded real-time processing.

For engineers reviewing the R5F21294JSP#U0 datasheet, R5F21294JSP#U0 pinout, R5F21294JSP#U0 application, or R5F21294JSP#U0 equivalent, key selection criteria include its J-version temperature grade (-40 to +85°C), LSSOP-20 package compatibility, on-chip data flash endurance (10,000 erase/write cycles), and hardware LIN support via Timer RA + UART0.

Technical Context

The R5F21294JSP#U0 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 16 KB program ROM from 2 KB data flash (dual 1 KB blocks), enabling field-upgradable configuration storage without erasing application code.

Peripheral integration includes dual UARTs (one supporting LIN physical layer), I²C bus interface, clock-synchronous serial I/O with chip select, and Timer RE with compare-match-only functionality (no RTC in J version). All I/O pins are CMOS-compatible with programmable direction and pull-up control.

Key Specifications

Pinout & Package

Package: 20-pin molded-plastic LSSOP (PLSP0020JB-A), 0.65 mm pitch, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21294SDSP#U0, R5F21294JSP#U0 removes RTC dependency on external 32 kHz crystal - simplifying layout and reducing component count. Against R5F21284JSP#U0, it adds 2 KB data flash for secure, wear-leveled parameter storage without external memory ICs.

Availability

R5F21294JSP#U0 is available at Aetrix Electronics and suitable for industrial control panels, automotive body electronics, office equipment motor drives, and smart appliance sensor hubs requiring stable component supply across extended product lifecycles.

Supply support for R5F21294JSP#U0 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, and power solutions for industrial, automotive, and IoT applications.

The R8C/29 Group, including R5F21294JSP#U0, was designed for cost-sensitive embedded systems needing integrated LIN, data flash, and robust operation across industrial temperature ranges.

FAQ

What is the maximum operating frequency of the R5F21294JSP#U0?

The R5F21294JSP#U0 achieves a minimum instruction execution time of 50 ns when operating at 20 MHz XIN clock frequency with VCC between 3.0 V and 5.5 V. This corresponds to a maximum sustained CPU throughput of 20 MIPS under those conditions, as confirmed in Table 1.2 of the R8C/29 Group datasheet Rev.2.10.

Does the R5F21294JSP#U0 include a real-time clock (RTC)?

No, the R5F21294JSP#U0 does not include functional real-time clock capability. While it contains Timer RE, the J version supports compare-match functionality only - unlike the N/D versions which implement full RTC with calendar functions. This is explicitly stated in Table 1.2 and Section 1.2 of the R8C/29 Group documentation.

What package type is used for the R5F21294JSP#U0?

The R5F21294JSP#U0 is packaged in a 20-pin molded-plastic LSSOP (PLSP0020JB-A) with 0.65 mm lead pitch. This package is verified in Table 1.4 (Product Information for R8C/29 Group) and Figure 1.4 (Pin Assignments), and is compatible with standard surface-mount assembly processes.

How many I/O pins does the R5F21294JSP#U0 provide?

The R5F21294JSP#U0 provides 13 configurable I/O ports (P1_0–P1_7, P3_3–P3_5, P3_7, P4_5), plus 3 dedicated input-only pins (P4_2, P4_6, P4_7), totaling 16 usable signal terminals. This count is specified in Table 1.2 under "Peripheral Functions → Ports" and confirmed in Table 1.6 (Pin Name Information).

Is the R5F21294JSP#U0 RoHS compliant?

Yes, the R5F21294JSP#U0 complies with the EU RoHS Directive, as confirmed in Renesas Electronics' environmental compliance documentation and noted in Section 10 of the referenced datasheet (REJ03B0169-0210 Rev.2.10). It contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits.