Renesas R5F212J0SNSP#U0

Overview

R5F212J0SNSP from Renesas Electronics is a 16-bit R8C/Tiny Series microcontroller with 2 KB Flash ROM, 256 bytes RAM, and 12 CMOS I/O ports in a 20-pin LSSOP package. It features an R8C CPU core executing instructions in 125 ns at 8 MHz, integrated 8-bit timers (RA, RB, RF), single UART, hardware LIN module, voltage detection circuit, and comparator - designed for cost-sensitive embedded control in consumer appliances and metering.

For engineers reviewing the R5F212J0SNSP datasheet, R5F212J0SNSP pinout, R5F212J0SNSP application, or R5F212J0SNSP equivalent, key selection criteria include its 2 KB Flash capacity, absence of Timer RE and second UART (vs. R8C/2H), -20°C to +85°C N-version temperature grade, and 20-pin PLSP0020JB-A package compatibility with board-level space constraints and low-power operation down to 0.7 µA in stop mode.

Technical Context

The R5F212J0SNSP implements the R8C/Tiny CPU core with 89 fundamental instructions, 16×16→32-bit multiplier, and 1 Mbyte address space. Its peripheral set includes Timer RA (8-bit, event counter/pulse width measurement), Timer RB (8-bit, PWM output), and Timer RF (16-bit, input capture/output compare), all sharing dedicated I/O pins like TRFO00–TRFO02 and TRFI.

It integrates one UART channel (UART0), hardware LIN bus support via timer RA and UART0, two comparators with external reference input (CVREF), and three voltage detection circuits for power-on reset and brown-out monitoring. Clock generation relies on high-speed/low-speed on-chip oscillators only - no XCIN/XCOUT crystal interface - simplifying BOM and layout for non-precision timing applications.

Key Specifications

Pinout & Package

Package: 20-pin LSSOP (PLSP0020JB-A), 0.65 mm lead pitch, exposed pad not present. Pin 1 marked by notch or dot; NC (no-connect) pins at positions 1, 4, 6, and 20 simplify routing and reduce stub effects.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F212J1SNSP, the R5F212J0SNSP offers lower cost and smaller memory footprint ideal for fixed-function control, while R5F212H1SNSP adds timing precision and serial flexibility at the expense of higher BOM cost and layout complexity - making R5F212J0SNSP optimal for volume-constrained, functionally stable designs.

Availability

R5F212J0SNSP is available at Aetrix Electronics and suitable for smart power outlets, appliance motor controllers, electricity meter front-ends, and industrial sensor nodes requiring stable component supply and long-term manufacturability.

Supply support for R5F212J0SNSP 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 automotive, industrial, and IoT markets.

The R8C/2J Group, including R5F212J0SNSP, was engineered for cost-effective, low-power embedded control in consumer electronics and metering - emphasizing integration of LIN, comparators, and efficient R8C core execution in compact packages.

FAQ

What is the maximum system clock frequency supported by the R5F212J0SNSP?

The R5F212J0SNSP supports a maximum system clock frequency of 8 MHz when operating within the 2.7 V to 5.5 V supply range. At this frequency, the minimum instruction execution time is 125 ns. For lower-voltage operation (2.2 V to 5.5 V), the maximum clock is reduced to 4 MHz with a 250 ns minimum instruction time - ensuring reliable timing margins across its full specified voltage range. This dual-frequency capability allows flexible power/performance trade-offs in the R5F212J0SNSP design.

Does the R5F212J0SNSP include a real-time clock (RTC) peripheral?

No, the R5F212J0SNSP does not include a dedicated Timer RE real-time clock peripheral - that feature is present in the R8C/2H Group but omitted from the R8C/2J Group. Applications requiring calendar-time tracking must implement RTC functionality in software using Timer RA or RB with periodic interrupts, or add an external RTC IC. The R5F212J0SNSP datasheet explicitly lists Timer RE as "Not implemented" in its specifications table.

What are the key differences between R5F212J0SNSP and R5F212J1SNSP?

The R5F212J1SNSP provides 4 KB Flash ROM and 384 bytes RAM versus the R5F212J0SNSP's 2 KB Flash and 256 bytes RAM - doubling program storage and increasing RAM by 50%. Both share identical peripherals, package (PLSP0020JB-A), pinout, and operating specifications. The R5F212J0SNSP is optimized for minimal-footprint, fixed-function firmware, while R5F212J1SNSP accommodates larger code bases such as those including communication stacks or enhanced user interfaces.

Can the R5F212J0SNSP drive a LIN bus directly without external transceivers?

No, the R5F212J0SNSP integrates only the LIN protocol controller (using UART0 and Timer RA), not the physical layer transceiver. An external LIN transceiver IC (e.g., TJA1020 or MCP2021) is required to convert the R5F212J0SNSP's UART-level signals to the ISO 17987-compliant bus voltage levels. The R5F212J0SNSP's TRFO10/TRFI and TXD0/RXD0 pins provide the logical interface - the transceiver handles dominant/recessive bit timing, slew rate control, and bus fault protection.

What is the purpose of the NC pins on the R5F212J0SNSP 20-pin LSSOP package?

Pins 1, 4, 6, and 20 on the R5F212J0SNSP are designated NC (No Connect) - they have no internal bonding or electrical connection to the die. These pins must remain unconnected on the PCB; tying them to ground or VCC may cause latch-up or undefined behavior. Their presence maintains mechanical symmetry and package compatibility across the R8C/2J family, simplifying board design reuse despite functional pin count reduction versus the R8C/2H variant.