Renesas R5F2135ACNFP#50

Overview

R5F2135ACNFP from Renesas Electronics is a 16-bit R8C CPU core MCU with 96 KB flash program ROM, 8 KB data flash (4 × 1 KB blocks), and 8 KB RAM, operating at up to 20 MHz (VCC = 2.7–5.5 V). It integrates UART0/1/2, I²C, SSU, LIN hardware module, 10-bit 12-channel ADC, dual 8-bit DACs, and six timer units (RA–RE, RD dual-channel) for motor control and real-time signal processing in appliance and industrial HMI systems.

For engineers reviewing the R5F2135ACNFP datasheet, R5F2135ACNFP pinout, R5F2135ACNFP application, or R5F2135ACNFP equivalent, key selection criteria include its 52-pin LQFP package, -20°C to +85°C N-version temperature grade, background operation (BGO) for data flash, integrated LIN transceiver support via Timer RA and UART0, and low-power wait/stop modes down to 3.5 µA and 2.0 µA respectively.

Technical Context

The R5F2135ACNFP implements the R8C CPU core with 89 fundamental instructions, 16×16→32-bit multiplier, and multiply-accumulate capability. Its memory map spans 1 Mbyte (00000h–FFFFFh), with fixed interrupt vector table at 0FFDCh–0FFFFh and data flash at 03000h–03FFFh.

It features four independent clock sources - XIN (up to 20 MHz), XCIN (32 kHz), high-speed on-chip oscillator (adjustable), and low-speed on-chip oscillator - plus oscillation stop detection, programmable frequency dividers (1/2/4/8/16), and voltage detection circuits supporting power-on reset and dual-level monitoring.

Key Specifications

Pinout & Package

52-pin LQFP package (PLQP0052JA-A), 10 mm × 10 mm body, 0.65 mm lead pitch, exposed pad not specified. Pin functions include 47 CMOS I/O ports (with selectable pull-up), 1 input-only port (P4_2), 12 analog inputs (AN0–AN11), dual DAC outputs (DA0/DA1), 3 UART channels, I²C/SCL/SDA, SSU/SSI/SSCK/SSO, LIN-compliant TRAO/TRBO, TREO clock output, and dedicated reset, MODE, XIN/XOUT, XCIN/XCOUT pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F2135ACNFP, R5F2135ACDFP offers extended temperature reliability at no peripheral or software trade-off, while R5F21358CNFP provides 32 KB less flash in the same package-ideal for firmware consolidation without PCB redesign.

Availability

R5F2135ACNFP is available at Aetrix Electronics and suitable for home appliance control, industrial HMI panels, audio remote systems, and office equipment power management requiring stable component supply across multi-year production cycles.

Supply support for R5F2135ACNFP 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/35C Group, including R5F2135ACNFP, was designed for cost-sensitive, EMI-robust embedded control in consumer and industrial appliances-emphasizing integration of LIN, ADC, DAC, and low-power timers in compact LQFP packages.

FAQ

What is the maximum operating frequency and supply voltage range for the R5F2135ACNFP?

The R5F2135ACNFP operates at up to 20 MHz when supplied with 2.7–5.5 V. At reduced voltage (1.8–5.5 V), it supports 5 MHz operation. Its minimum instruction execution time is 50 ns under 20 MHz/2.7–5.5 V conditions, enabling deterministic real-time response in motor control loops and sensor sampling routines. The R5F2135ACNFP maintains full peripheral functionality across this voltage range.

Does the R5F2135ACNFP support hardware LIN communication, and how is it implemented?

Yes, the R5F2135ACNFP includes a hardware LIN module compliant with LIN 2.0/2.1 standards. It combines Timer RA for baud rate generation and signal edge timing with UART0 for data framing and error checking. No external LIN transceiver is required for basic slave-node operation. The R5F2135ACNFP uses dedicated pins TRAO (transmit) and TRBO (bus output) to drive the LIN bus directly, simplifying design for appliance sub-modules like door locks or sensor nodes.

How does the data flash architecture of the R5F2135ACNFP support firmware updates in the field?

The R5F2135ACNFP contains 4 × 1 KB data flash blocks (total 4 KB) with Background Operation (BGO) capability. This allows the R5F2135ACNFP to execute application code from program ROM while simultaneously erasing or programming data flash-enabling safe over-the-air or service-port firmware patching without system interruption. Each block endures 10,000 write/erase cycles, making the R5F2135ACNFP suitable for storing calibration tables, usage logs, or configuration parameters across product lifetime.

What low-power modes are available on the R5F2135ACNFP, and what are their typical current draws?

The R5F2135ACNFP supports wait mode (3.5 µA @3.0 V, 32 kHz XCIN clock active) and stop mode (2.0 µA @3.0 V, all clocks halted except optional low-speed oscillator for watchdog). These modes retain RAM content and allow wake-up via external interrupt, key input, or timer event. The R5F2135ACNFP achieves these figures without external components, making it ideal for battery-powered remotes and standby controllers where ultra-low quiescent current is essential.

Can the R5F2135ACNFP's ADC operate in sweep mode, and how many channels can it scan autonomously?

Yes, the R5F2135ACNFP's 10-bit ADC supports sweep mode, allowing automatic sequential conversion across all 12 analog input channels (AN0–AN11) without CPU intervention. Conversion results are stored in AD0–AD7 registers, with overflow handled via interrupt. This feature enables continuous sensor monitoring-such as temperature, voltage, and current feedback in motor drives-while freeing the R5F2135ACNFP CPU for higher-priority tasks like PWM update or communication protocol handling.