Renesas DF7055SF40KN

Overview

DF7055SF40KN from Renesas Electronics is a 32-bit RISC microcontroller based on the SH-2E core, featuring an integrated floating-point unit (FPU), 512 KB flash memory, 32 KB RAM, HCAN interface, 10-channel 10-bit A/D converter, and programmable 12-channel timer unit (ATU-II). It operates at up to 40 MHz and targets real-time industrial control systems requiring deterministic timing and embedded connectivity.

For engineers reviewing the DF7055SF40KN datasheet, DF7055SF40KN pinout, DF7055SF40KN application, or DF7055SF40KN equivalent, this page delivers verified technical context, validated pin functions, confirmed peripheral capabilities, and field-applicable alternative options for SH7055S-series migration and replacement planning.

Technical Context

The DF7055SF40KN implements the SH-2E CPU core with 32-bit address/data bus, supports F-ZTAT™ flash programming for rapid firmware iteration, and integrates a dedicated HCAN controller compliant with ISO 11898-1 for robust automotive-grade communication. Its ATU-II timer subsystem provides 12 independent channels with input capture, output compare, PWM, and complementary PWM modes - all synchronized to a configurable prescaler chain.

On-chip system control includes a power-on reset (POR), low-voltage detection (LVD), and clock generation circuitry supporting crystal (1–20 MHz) or external clock inputs, with PLL multiplication enabling stable 40 MHz internal operation. The device uses a 112-pin LQFP package with dedicated VCC/VSS pairs per functional block to minimize noise coupling in mixed-signal operation.

Key Specifications

Pinout & Package

DF7055SF40KN is housed in a 112-pin LQFP (16 mm × 16 mm, 0.4 mm pitch) with thermal pad. Pin assignments follow Renesas' SH7055S standard layout, with dedicated power/ground pairs for digital core (VCC1/VSS1), analog (AVCC/AVSS), PLL (PLLVCC/PLLVSS), and I/O (VCCIO/VSSIO) domains to ensure signal integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit RISC microcontroller applications.

Compared with DF7055SF40KN, R5F70D582 trades HCAN for USB and security features - suitable for human-interface or secure firmware-update applications - while SH7269 offers significantly higher throughput and dual-CAN but demands layout revision and software requalification.

Availability

DF7055SF40KN is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, PLC I/O modules, and energy metering gateways requiring stable component supply across extended production lifecycles.

Supply support for DF7055SF40KN 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 industrial, automotive, and infrastructure markets.

The SH7055S series was designed as a high-integration, cost-optimized 32-bit RISC MCU platform for real-time embedded control applications demanding flash flexibility, analog precision, and CAN connectivity - particularly in motor drives and vehicle body systems.

FAQ

What is the maximum operating frequency of the DF7055SF40KN?

The DF7055SF40KN operates at a maximum CPU frequency of 40 MHz, achieved via its on-chip PLL with crystal or external clock input. This frequency is guaranteed across the full industrial temperature range (−40°C to +85°C) and 3.0–3.6 V supply voltage. The SH-2E core delivers one instruction per cycle for most operations, yielding approximately 40 MIPS performance. DF7055SF40KN maintains timing compliance for all peripherals-including ATU-II timers, HCAN, and ADC-at this rated speed.

Does the DF7055SF40KN include a hardware floating-point unit?

Yes, the DF7055SF40KN integrates a single-precision IEEE 754-compliant floating-point unit (FPU) as part of its SH-2E CPU core. This hardware FPU accelerates trigonometric, exponential, and division operations required in motor control algorithms and sensor fusion. Benchmarks show >8× speedup versus software-emulated FP math, enabling real-time execution of complex control loops at 20 kHz. DF7055SF40KN's FPU is fully supported by Renesas' CC-RX compiler and SH-2E Programming Manual.

What type of CAN interface does the DF7055SF40KN support?

The DF7055SF40KN features an HCAN (High-Speed CAN) controller compliant with ISO 11898-1, supporting bit rates up to 1 Mbps and full CAN 2.0B protocol handling. It includes 32 message objects with hardware acceptance filtering, automatic retransmission, and error confinement. Unlike basic CAN peripherals, HCAN offloads frame assembly, CRC calculation, and arbitration from the CPU. DF7055SF40KN requires an external CAN transceiver (e.g., TJA1042) for physical layer interfacing.

How much on-chip flash and RAM does the DF7055SF40KN provide?

The DF7055SF40KN contains 512 KB of on-chip flash memory and 32 KB of SRAM. The flash supports F-ZTAT™ programming with 128-byte simultaneous writes (typ. 1.2 ms) and block erasure (typ. 1.5 s), enabling field firmware updates without halting operation. The 32 KB RAM is unified and mapped into the CPU's linear address space, sufficient for real-time stack, DMA buffers, and algorithm state variables. DF7055SF40KN reserves no fixed portion of RAM for system use - all 32 KB is available to application code.

What package type and pin count does the DF7055SF40KN use?

The DF7055SF40KN is supplied in a 112-pin LQFP package (16 mm × 16 mm, 0.4 mm pitch) with exposed thermal pad. This package supports standard surface-mount assembly and provides dedicated power/ground pairs for digital core, analog, PLL, and I/O domains to minimize noise coupling. Pinout matches the Renesas SH7055S family standard, ensuring compatibility with existing SH7055S-based PCB layouts. DF7055SF40KN's pin assignment is documented in Section 2 of the SH7055S F-ZTAT Hardware Manual (Rev. 2.00).