Renesas HD64F3694GFTV

Overview

HD64F3694GFTV from Renesas Electronics is a 16-bit single-chip microcomputer in the H8/300H Tiny Series, featuring an H8/300H CPU core with H8/300 instruction set compatibility, 128 KB on-chip ROM, 8 KB RAM, and integrated peripherals including UART, timer/counters, and I/O ports. It operates at up to 20 MHz and targets embedded control in industrial equipment and consumer appliances.

For engineers reviewing the HD64F3694GFTV datasheet, HD64F3694GFTV pinout, HD64F3694GFTV application, or HD64F3694GFTV equivalent, key selection criteria include its 128 KB ROM capacity, 20 MHz max clock frequency, 100-pin TQFP package, low-power sleep/standby modes, and integrated serial communication interfaces for compact real-time control systems.

Technical Context

The HD64F3694GFTV implements the H8/300H CPU architecture with 16-bit data bus, 24-bit address space (16 MB), and supports both internal ROM execution and external memory expansion via multiplexed address/data bus. It integrates system-level functions including clock pulse generators (main and subclock), power-down mode controllers (sleep, standby, subsleep), and reset circuitry with watchdog timer.

Peripheral integration includes three 16-bit timer/counters (one with input capture/output compare), two asynchronous serial interfaces (UART), and 85 general-purpose I/O pins configurable as ports P0–P8. Memory protection is enforced via undefined address access prohibition and dedicated register lock bits for critical control registers.

Key Specifications

Pinout & Package

HD64F3694GFTV is housed in a 100-pin LQFP (Low-Profile Quad Flat Package) with 0.5 mm pitch, measuring 14 mm × 14 mm, suitable for high-density PCB layouts and industrial-grade thermal cycling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3694GFTV, HD64F3687GFTV offers identical architecture and pinout at reduced memory cost, while R5F100PLAFB provides superior power efficiency and integrated analog functions but mandates full re-engineering due to incompatible ISA and packaging.

Availability

HD64F3694GFTV is available at Aetrix Electronics and suitable for industrial motor control, home appliance interface, and point-of-sale terminal applications requiring stable component supply and long-term lifecycle support.

Supply support for HD64F3694GFTV 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 H8/3694 Group was designed for cost-sensitive, real-time embedded control in appliances and industrial equipment, emphasizing code efficiency, low-power operation, and robust peripheral integration without external support chips.

FAQ

What is the maximum operating frequency of the HD64F3694GFTV?

The HD64F3694GFTV supports a maximum system clock frequency of 20 MHz, achievable using an external crystal (1–20 MHz) or ceramic resonator connected to XTAL/EXTAL pins. This frequency enables deterministic real-time execution of control loops and serial communication at standard baud rates up to 115.2 kbps without overclocking risk.

Does the HD64F3694GFTV include on-chip flash memory, and what is its capacity?

Yes, the HD64F3694GFTV integrates 128 KB of on-chip flash ROM, supporting in-system programming via boot-mode selection and dedicated flash control registers (FLMCR1/FLMCR2). This eliminates the need for external non-volatile memory and allows firmware updates in the field without removing the device from the target board.

How many I/O pins does the HD64F3694GFTV provide, and are they individually configurable?

The HD64F3694GFTV provides 85 general-purpose I/O pins distributed across ports P0–P8, each configurable as input or output via dedicated port direction registers (e.g., P0DR). Pull-up resistors can be enabled per pin, and alternate functions (e.g., UART, timer I/O) are selected through mode control registers, offering flexible peripheral mapping.

What low-power modes are supported by the HD64F3694GFTV, and what is the lowest current draw?

The HD64F3694GFTV supports four low-power modes: Sleep, Standby, Subsleep, and Subactive. In Standby mode-where only the 32.768 kHz subclock remains active-the device draws ≤1.5 µA, enabling multi-year battery operation in sensor nodes or RTC-backed applications while retaining RAM contents and wake-up capability.

Is the HD64F3694GFTV pin-compatible with other devices in the H8/3694 family?

Yes, the HD64F3694GFTV shares the same 100-pin TQFP package and pin assignment with other members of the H8/3694 Group, including HD64F3694 and HD64F3694G. This allows direct substitution within the same family for memory or feature scaling (e.g., upgrading from 64 KB to 128 KB ROM) without PCB layout changes.