Renesas DF3068F25V

Overview

DF3068F25V from Renesas Electronics is a 16-bit single-chip microcontroller based on the H8/300H CPU core, featuring 256 KB on-chip flash memory (F-ZTAT™), 16 KB RAM, and integrated peripherals including three-channel SCI with ISO/IEC7816-3 smart card support, 16-bit timers, A/D and D/A converters, DMA controller, and programmable timing pattern controller. It operates at up to 25 MHz and targets embedded control in industrial instrumentation and secure peripheral interfaces.

For engineers reviewing the DF3068F25V datasheet, DF3068F25V pinout, DF3068F25V application, or DF3068F25V equivalent, key selection criteria include its 25 MHz max clock frequency, on-chip flash reprogrammability, module-level standby power control (down to 19 mA at 20 MHz), ISO/IEC7816-3 smart card interface compliance, and support for seven MCU operating modes with configurable bus width and address space.

Technical Context

The DF3068F25V implements the H8/300H 32-bit internal architecture with sixteen 16-bit general-purpose registers and a linear 16-Mbyte address space. Its memory subsystem supports independent data bus width and access cycle configuration per of eight address areas, enabling flexible interfacing with diverse external memory types.

Power management includes three low-power states: Sleep mode (24–38 mA at 5 V/20–25 MHz), Module Standby mode (19–37 mA), and Standby mode (≤80 µA at 50°C). The F-ZTAT™ flash allows on-board programming without external hardware, supporting field firmware updates.

Key Specifications

Pinout & Package

The DF3068F25V is housed in a 128-pin LQFP package (20 mm × 20 mm, 0.5 mm pitch) with thermal pad, rated for industrial temperature range (−40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DF3068F25V, R5F33068BDFP adds CAN but removes smart card capability and changes package, while HD64F3068TE replaces flash with mask ROM-making DF3068F25V the only option supporting both ISO/IEC7816-3 and field-upgradable firmware in this pinout and feature set.

Availability

DF3068F25V is available at Aetrix Electronics and suitable for secure access terminals, industrial data loggers, PLC I/O modules, and medical diagnostic peripherals requiring stable component supply and long-term manufacturing support.

Supply support for DF3068F25V 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 enterprise applications.

The H8/300H series-including DF3068F25V-was designed for cost-effective, high-reliability embedded control in resource-constrained systems requiring integrated analog interfaces, secure communication, and low-power operation.

FAQ

What is the maximum operating frequency of the DF3068F25V?

The DF3068F25V supports a maximum system clock frequency of 25 MHz, as confirmed in the Electrical Characteristics section of the H8/3068F Hardware Manual (Rev. 3.00, p. 677). This frequency defines the upper limit for instruction execution speed, timer resolution, and peripheral bus timing. Operation above 25 MHz is not guaranteed and may result in undefined behavior or timing violations. The DF3068F25V achieves this speed using an external crystal resonator (2–25 MHz) or an external clock source, with internal frequency division options for lower-power operation.

Does the DF3068F25V support in-system programming of its flash memory?

Yes, the DF3068F25V features F-ZTAT™ (Flexible ZTAT) on-chip flash memory that supports full in-system programming and erasing without requiring external high-voltage programmers. According to the Hardware Manual (Rev. 3.00, p. 690), programming time is 10–200 ms per 128-byte block and erase time is 100–1200 ms per block. The DF3068F25V includes dedicated flash control registers and boot ROM routines enabling firmware updates via serial interface or on-board host software-critical for field-deployed devices requiring post-manufacture calibration or security patches.

Which smart card standard does the DF3068F25V support?

The DF3068F25V supports ISO/IEC7816-3 for contact-based smart cards through its three-channel Serial Communication Interface (SCI). As stated in the Preface (p. iv) and Section 19.2.1 (p. 651), the SCI has been specifically expanded to comply with this standard, providing built-in clock generation, voltage regulation, and protocol framing. This eliminates the need for external smart card interface ICs. The DF3068F25V's implementation handles T=0 and T=1 protocols, making it suitable for secure access, payment, and identity verification systems where direct card interface is required.

What are the low-power modes supported by the DF3068F25V?

The DF3068F25V supports three distinct low-power modes: Sleep mode (24–38 mA at 5 V/20–25 MHz), Module Standby mode (19–37 mA), and Standby mode (≤80 µA at 50°C). These are detailed in Table 21.2 (p. 677) of the Hardware Manual. Each mode disables progressively more circuitry: Sleep halts CPU execution while preserving register and RAM contents; Module Standby additionally powers down selected peripherals; Standby retains only real-time clock and wake-up logic. The DF3068F25V allows software-controlled entry/exit from all modes, enabling precise power budgeting in battery-operated applications.

Is the DF3068F25V pin-compatible with other H8/3068F variants?

Yes, the DF3068F25V shares the same 128-pin LQFP package and pin assignment as other members of the H8/3068F group, including HD64F3068TE and HD64F3068F. Pin compatibility is confirmed in Section 1.3.1 (Pin Arrangement, p. 7) and Section 1.3.3 (Pin Assignments in Each Mode, p. 13) of the Hardware Manual. This allows direct substitution in existing PCB designs when migrating between flash (DF3068F25V), mask ROM (HD64F3068TE), or OTP (HD64F3068F) versions-provided peripheral usage and power requirements align. However, functional differences (e.g., absence of CAN in DF3068F25V) must be verified in the target application.