Renesas HD64F3694FPJ

Overview

HD64F3694FPJ from Renesas Technology 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, 64 KB on-chip Flash ROM, 4 KB RAM, and integrated peripherals including Timer A, Timer V, and multiple I/O ports. It operates at up to 20 MHz and supports multiple power-down modes (Sleep, Standby, Subsleep) for embedded control applications in industrial sensors and motor drives.

For engineers reviewing the HD64F3694FPJ datasheet, HD64F3694FPJ pinout, HD64F3694FPJ application, or HD64F3694FPJ equivalent, this page delivers verified technical identity, package mapping (FP-100, 100-pin plastic QFP), confirmed peripheral register sets (FLMCR1, TMA, TCNTV), and two validated alternative microcontrollers for H8/300H-based system upgrades.

Technical Context

The HD64F3694FPJ implements the H8/300H CPU architecture with 24-bit address space, supporting both big-endian memory layout and 16-bit data paths. Its on-chip Flash memory includes hardware protection (FLPWCR-controlled power gating) and software lock bits (FENR-configurable), enabling secure in-system programming.

Peripheral integration includes Timer A for interval timing and clock output, Timer V for pulse-width modulation with dual compare registers (TCORA/TCORB), and five programmable I/O ports (Ports 1, 2, 5, 7, 8) with individual pull-up control (PUCR1/PUCR5) and mode selection (PMR1/PMR5). All timers support interrupt generation via dedicated vector addresses.

Key Specifications

Pinout & Package

HD64F3694FPJ is housed in a 100-pin plastic quad flat pack (QFP) package designated FP-100, with 0.5 mm lead pitch and standard JEDEC MO-137AC footprint. The package supports surface-mount assembly and thermal dissipation up to 1.2 W under specified ambient conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3694FPJ, HD64F3687FPJ trades Flash/RAM capacity and Timer V for lower cost, while HD64F3692FPJ removes subclock dependency at the expense of lowest-power operation - both retain full pin compatibility and software portability within the H8/300H family.

Availability

HD64F3694FPJ is available at Aetrix Electronics and suitable for industrial sensor nodes, brushless DC motor controllers, programmable logic relays, and smart power outlets requiring stable component supply and long-term lifecycle support.

Supply support for HD64F3694FPJ 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 Technology Corp. (now part of Renesas Electronics Corporation) is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and consumer systems.

The HD64F3694FPJ belongs to the H8/300H Tiny Series - designed for cost-effective, low-power embedded control in space-constrained applications where code density, interrupt latency, and peripheral integration are critical.

FAQ

What is the maximum operating frequency of the HD64F3694FPJ?

The HD64F3694FPJ supports a maximum system clock frequency of 20 MHz when driven by an external crystal or ceramic resonator connected to XTAL/EXTAL pins. This frequency is maintained across commercial temperature range (0°C to +70°C) and 5.0 V ±10% supply, enabling deterministic real-time execution of H8/300H instructions with predictable interrupt latency.

Does the HD64F3694FPJ include on-chip Flash memory, and can it be reprogrammed in-circuit?

Yes, the HD64F3694FPJ integrates 64 KB of on-chip Flash memory that supports in-system programming (ISP) without removing the device from the target board. Programming is performed via boot mode (using on-chip ROM loader) or user program mode (using Flash control registers FLMCR1/FLMCR2), with hardware (FLPWCR) and software (FENR) protection mechanisms to prevent accidental writes.

Which power-saving modes does the HD64F3694FPJ support, and what is the lowest current draw?

The HD64F3694FPJ supports four power-down modes: Sleep, Standby, Subsleep, and Subactive. In Subsleep mode - activated by stopping the main clock and running only the 32.768 kHz subclock - typical current consumption drops to 1.2 μA at 5.0 V and 25°C, making it suitable for battery-backed applications requiring infrequent wake-up events such as real-time clock interrupts or external pin triggers.

Is the HD64F3694FPJ pin-compatible with other members of the H8/300H Tiny Series?

Yes, the HD64F3694FPJ uses the FP-100 (100-pin QFP) package and shares identical pin assignments with HD64F3687FPJ and HD64F3692FPJ. All three devices maintain consistent signal placement for VCC/VSS, XTAL/EXTAL, RESET, NMI, CLKOUT, and all I/O ports (P1–P8), enabling direct substitution in existing PCB layouts when memory or peripheral requirements align.

What development tools are officially supported for the HD64F3694FPJ?

Renesas officially supports the E10T on-chip debugging emulator for HD64F3694FPJ firmware development and validation. When using E10T, pins P85–P87 and the NMI pin are reserved for debug interface use, and memory areas H'7000–H'7FFF and H'F780–H'FB7F are inaccessible to user code - these constraints are documented in the H8/3694 Group Hardware Manual Rev. 4.00.