Renesas R5F21266JFP#U0

Overview

R5F21266JFP#U0 from Renesas Electronics is a 16-bit R8C/26 Group single-chip microcontroller with 32 KB flash ROM, 1.5 KB RAM, 12-channel 10-bit A/D converter, UART0/UART1 serial interfaces, and hardware LIN module - designed for automotive body electronics and industrial control systems operating at -40°C to +85°C.

For engineers reviewing the R5F21266JFP#U0 datasheet, R5F21266JFP#U0 pinout, R5F21266JFP#U0 application, or R5F21266JFP#U0 equivalent, key selection criteria include its J-version temperature grade (-40°C to +85°C), 32-pin LQFP package (PLQP0032GB-A), real-time clock capability via Timer RE, I²C bus interface, and on-chip high-speed oscillator with frequency adjustment.

Technical Context

The R5F21266JFP#U0 implements the R8C CPU core with 89 fundamental instructions and executes at 50 ns minimum instruction time (20 MHz XIN, VCC = 3.0–5.5 V). It integrates three independent clock generation circuits: XIN-based crystal/resonator oscillator, high-speed on-chip oscillator with trimmable frequency, and XCIN-based 32 kHz RTC oscillator (N/D versions only - not supported in J version).

Peripheral subsystems include Timer RA/RB (8-bit × 2), Timer RC (16-bit input capture/output compare), Timer RE (real-time clock and compare match function), two UART channels, one I²C bus interface, one clock-synchronous serial I/O with chip select, and a hardware LIN transceiver co-located with Timer RA and UART0.

Key Specifications

Pinout & Package

Package: 32-pin molded-plastic LQFP (PLQP0032GB-A), 7 mm × 7 mm, 0.8 mm pitch, exposed pad optional - suitable for automated SMT assembly and thermal management in compact automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21266JFP#U0, R5F21266SDFP offers higher reliability screening for harsh industrial environments, while R5F21276JFP adds data flash for persistent settings - neither is pin-compatible nor drop-in; both require PCB layout review due to identical PLQP0032GB-A footprint but distinct programming and qualification workflows.

Availability

R5F21266JFP#U0 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor hubs, and home appliance control systems requiring stable component supply across long production lifecycles.

Supply support for R5F21266JFP#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, power, and SoC solutions for automotive, industrial, and IoT markets.

The R8C/26 Group, including R5F21266JFP#U0, was engineered for cost-sensitive, real-time embedded control in automotive body electronics and industrial equipment - emphasizing integrated peripherals, low power, and robust operation across extended temperature ranges.

FAQ

What is the maximum operating frequency and corresponding supply voltage range for R5F21266JFP#U0?

R5F21266JFP#U0 achieves a minimum instruction execution time of 50 ns at 20 MHz XIN frequency, requiring VCC = 3.0 V to 5.5 V. This specification applies to J-version devices and is validated across the full -40°C to +85°C operating ambient temperature range.

Does R5F21266JFP#U0 support real-time clock functionality, and how is it implemented?

Yes, R5F21266JFP#U0 implements real-time clock functionality via Timer RE, which provides both RTC counting and compare-match interrupt capability. Unlike N/D versions, the J version does not support the XCIN/XCOUT 32 kHz crystal oscillator; RTC operation relies on internal clock sources or external timing inputs routed to Timer RE.

Is the hardware LIN module in R5F21266JFP#U0 compliant with LIN 2.x standards?

Yes, the hardware LIN module in R5F21266JFP#U0 supports LIN 2.0 and LIN 2.1 protocols. It uses UART0 and Timer RA to generate accurate baud rates and handle break/delimiter fields, enabling full slave-node functionality without external transceiver components in standard automotive body networks.

What are the A/D converter specifications of R5F21266JFP#U0, and which pins support analog input?

R5F21266JFP#U0 features a single 10-bit successive-approximation A/D converter with 12 input channels (AN0–AN11). Analog inputs are mapped to P0_0–P0_7, P1_0–P1_3, and P1_5–P1_7 - all accessible via dedicated pins with programmable sampling time and trigger sources.

Can R5F21266JFP#U0 operate from a 3.3 V supply, and what is its typical active current consumption at that voltage?

Yes, R5F21266JFP#U0 operates within VCC = 3.0 V to 5.5 V. At VCC = 3.0 V and f(XIN) = 10 MHz, typical active current consumption is 6 mA - verified under standard test conditions and suitable for 3.3 V system designs with moderate peripheral activity.