Renesas R5F72856N100FP#U2

Overview

R5F72856N100FP#U2 from Renesas Electronics is a 32-bit SuperH RISC microcontroller featuring a 100 MHz CPU clock, 512 KB on-chip Flash memory, and 64 KB RAM. It integrates CAN 2.0B controller, 12-bit ADC (16-channel), and multiple serial interfaces including SCI, I²C, and USB 2.0 full-speed. Designed for industrial motor control and factory automation systems requiring real-time deterministic response.

For engineers reviewing the R5F72856N100FP#U2 datasheet, R5F72856N100FP#U2 pinout, R5F72856N100FP#U2 application, or R5F72856N100FP#U2 equivalent, key selection criteria include its 100-pin LQFP package, integrated CAN transceiver support via external PHY, 12-bit ADC sampling rate up to 1.25 MSPS, and SH-2A core compliance with IEEE 754 single-precision floating-point unit (FPU) extension.

Technical Context

The R5F72856N100FP#U2 implements the SH-2A CPU core with 5-stage pipeline, supporting both big-endian and little-endian data access modes. It features a dedicated Data Transfer Controller (DTC) for zero-CPU-overhead peripheral-to-memory transfers and an advanced Interrupt Controller (INTC) with 128 interrupt sources and programmable priority levels.

Its Clock Pulse Generator (CPG) supports multiple clock domains: main PLL (up to 100 MHz), USB 48-MHz dedicated oscillator, and independent peripheral clocks for ADC, CAN, and timers. The device includes a 32-bit watchdog timer (WDT) with windowed operation mode and reset output capability.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), thermally enhanced with exposed pad for improved heat dissipation in motor control applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F72855N100FP#U2 and R5F72865N100FP#U2, the R5F72856N100FP#U2 offers balanced feature set for mid-tier industrial controllers-retaining USB for field serviceability while omitting Ethernet to reduce complexity and EMI sensitivity in electrically noisy environments.

Availability

R5F72856N100FP#U2 is available at Aetrix Electronics and suitable for industrial motor drives, programmable logic controllers (PLCs), and factory automation gateways requiring stable component supply across extended production lifecycles.

Supply support for R5F72856N100FP#U2 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 manufacturer headquartered in Tokyo, Japan, specializing in microcontrollers, analog, and power management solutions for industrial, automotive, and infrastructure markets.

The SH7280 Group-including the R5F72856N100FP#U2-is designed specifically for deterministic real-time control in factory automation, motion control, and industrial networking applications, emphasizing low-latency interrupt response and integrated peripheral co-processing.

FAQ

What is the maximum operating frequency of the R5F72856N100FP#U2 CPU core?

The R5F72856N100FP#U2 features the SH-2A 32-bit RISC core with a maximum operating frequency of 100 MHz. This frequency is achieved using the on-chip PLL with an external crystal (typically 8–12 MHz). The core delivers 1.33 DMIPS/MHz performance, enabling high-speed execution of motion control algorithms and real-time communication stacks without external acceleration.

Does the R5F72856N100FP#U2 include an integrated USB physical layer?

No, the R5F72856N100FP#U2 includes a USB 2.0 full-speed controller (up to 12 Mbps) but requires an external USB transceiver for physical layer signaling. The device provides dedicated USB_DP and USB_DM pins compatible with standard transceivers such as the NXP ISP1504 or Microchip USB3300. Internal USB clock generation (48 MHz) is supported via ceramic resonator or external source.

How many CAN interfaces does the R5F72856N100FP#U2 support?

The R5F72856N100FP#U2 integrates one CAN 2.0B-compliant controller with 32 message buffers and hardware acceptance filtering. It supports bit rates up to 1 Mbps and includes dedicated CAN_TX and CAN_RX pins for connection to an external CAN transceiver. No second CAN channel is present-this distinguishes it from higher-tier variants like the R5F72865N100FP#U2.

What is the ADC resolution and sampling speed of the R5F72856N100FP#U2?

The R5F72856N100FP#U2 includes a single 12-bit successive-approximation ADC with 16 input channels. Its maximum sampling rate is 1.25 million samples per second (MSPS), achievable in burst mode with hardware trigger synchronization. The ADC supports programmable sample-and-hold timing, hardware averaging across up to 16 conversions, and direct memory access via the DTC to minimize CPU load during high-frequency sensing.

Is the R5F72856N100FP#U2 pin-compatible with other SH7280 Group microcontrollers?

Yes, the R5F72856N100FP#U2 is pin-compatible with other 100-pin LQFP variants in the SH7280 Group, including the R5F72855N100FP#U2 and R5F72865N100FP#U2. All share identical pin assignments for power, clocks, reset, JTAG, and primary peripherals. Differences lie in on-chip feature enablement (e.g., USB presence, Ethernet MAC, Flash/RAM size), not pin function mapping or electrical characteristics.