Renesas DF3029F25V

Overview

DF3029F25V from Renesas Electronics is a 16-bit single-chip microcontroller based on the H8/300H CPU core, integrating on-chip flash memory (256 KB), 16 KB RAM, and peripheral modules including 8-channel 10-bit A/D converter, UART, I²C, and timer units. It operates at up to 25 MHz with 3.3 V supply and supports on-chip debugging via E10T emulator. It is used in industrial control panels requiring deterministic real-time response and firmware-upgradable logic.

For engineers reviewing the DF3029F25V datasheet, DF3029F25V pinout, DF3029F25V application, or DF3029F25V equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in Renesas' official H8/3029F-ZTAT Hardware Manual Rev. 2.00 (2004.06) and product code mapping.

Technical Context

The DF3029F25V implements the H8/300H 32-bit internal architecture with Harvard-style memory organization, supporting both EMU (emulation) and normal execution modes. Its on-chip flash supports in-system programming with 128-byte write units and includes dedicated registers like FTDAR for flash transfer address control.

It features dual power domains: VCC (3.3 V digital supply) and VRAM (≥3.0 V RAM retention voltage), with four low-power modes - Sleep, Module Standby, Standby, and Flash Programming - each with distinct current profiles (e.g., 70 µA standby at Ta ≤ 50°C). A/D conversion achieves ±4.0 LSB absolute accuracy over 134-state timing.

Key Specifications

Pinout & Package

DF3029F25V is housed in a 128-pin LQFP package (20 mm × 20 mm, 0.4 mm pitch) with thermal pad. Pin assignments are mode-dependent (normal, boot, emulation), and NC pins must remain unconnected per Renesas design guidance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3048F25, DF3029F25V offers identical peripheral compatibility but lower memory - ideal for cost-sensitive, fixed-function controllers. Against R5F33029WDFP, DF3029F25V provides proven stability and simpler toolchain support for legacy industrial firmware maintenance.

Availability

DF3029F25V is available at Aetrix Electronics and suitable for industrial automation, building management systems, and test equipment requiring stable component supply across extended production lifecycles.

Supply support for DF3029F25V 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 Japanese semiconductor manufacturer formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices.

The H8 Family targets cost-effective, deterministic real-time control in industrial, office, and consumer equipment - emphasizing reliability, on-chip integration, and long-term availability for embedded applications.

FAQ

What is the maximum operating frequency of the DF3029F25V?

The DF3029F25V operates at a maximum clock frequency of 25 MHz. This rating is specified under DC characteristics with VCC = 3.3 V and ambient temperature ≤ 50°C. The device supports external crystal or clock input on CLKIN, and its internal PLL is not present - frequency scaling is achieved solely via external source selection. DF3029F25V maintains full peripheral functionality and timing compliance at this speed.

Does the DF3029F25V support in-system programming of its flash memory?

Yes, the DF3029F25V supports in-system programming via its built-in serial boot-mode interface. Using UART0, users can issue standardized commands (e.g., H'42 for programming start) to erase and program flash in 128-byte units. The FTDAR register controls destination addressing, and flash operations require VCC ≥ 3.0 V. DF3029F25V's flash endurance is rated for 10,000 write/erase cycles per block.

What are the power supply requirements for retaining RAM during standby mode?

DF3029F25V requires VRAM ≥ 3.0 V to retain the full 16 KB RAM during standby mode. While VCC may be powered down, VRAM must remain active and stable. At Ta ≤ 50°C, standby current is 70 µA; above 50°C, it rises to 100 µA. DF3029F25V does not support VCC-only retention - VRAM is mandatory for data persistence.

How many analog input channels does the DF3029F25V A/D converter support?

The DF3029F25V integrates an 8-channel, 10-bit successive approximation register (SAR) A/D converter. Channels AD0–AD7 map directly to port P1 pins and operate in single-ended mode. Conversion time is 134 CPU states (≤5.4 µs at 25 MHz), with ±4.0 LSB absolute accuracy and ±3.5 LSB nonlinearity error. DF3029F25V does not support differential input or hardware averaging.

Is the DF3029F25V pin-compatible with other H8/3029 variants such as HD64F3029F25W?

Yes, DF3029F25V is pin-compatible with HD64F3029F25W and HD64F3029FBL25, sharing the same 128-pin LQFP package and identical pin functions. Differences lie in screening grade (Standard vs. Wide-temp), packaging (plastic vs. ceramic), and minor electrical specs - e.g., HD64F3029F25W specifies wider operating temperature (−40°C to +85°C) and tighter VCC tolerance. DF3029F25V retains full functional and layout compatibility across this variant group.