Renesas DN3687GFPV

Overview

DN3687GFPV from Renesas Electronics is a 16-bit single-chip microcomputer in the H8/3687 Group, featuring the H8/300H CPU core with 16 MB address space, 32 KB on-chip ROM, and 2 KB RAM. It supports multiple clock sources including crystal (up to 20 MHz), ceramic resonator, or external clock input, and integrates UART (SCI), timer/counters, and I/O ports for embedded control applications in industrial equipment and office automation.

For engineers reviewing the DN3687GFPV datasheet, DN3687GFPV pinout, DN3687GFPV application, or DN3687GFPV equivalent, key selection criteria include its 100-pin PQFP package, 5 V operation, built-in power-down modes (Sleep, Standby, Subsleep), and compatibility with H8/300H instruction set for legacy code reuse and toolchain continuity.

Technical Context

The DN3687GFPV implements the H8/300H CPU architecture with 16-bit ALU, 32 general-purpose registers, and Harvard-style memory mapping. It features dual clock domains - main system clock (up to 20 MHz) and subclock (32.768 kHz) - enabling real-time clock functions and low-power operation.

Peripheral integration includes three serial communication interfaces (SCI), four 16-bit timer/counters with capture/compare capability, 8-channel 10-bit ADC, and 80 programmable I/O pins. The device supports interrupt-driven operation with 64 vector addresses and configurable edge-triggered external interrupts.

Key Specifications

Pinout & Package

DN3687GFPV is housed in a 100-pin Plastic Quad Flat Package (PQFP) with 0.65 mm lead pitch, JEDEC MS-026AC compliant, suitable for surface-mount reflow assembly and industrial thermal cycling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3687G and H8/3694F, DN3687GFPV offers optimal cost-performance balance for fixed-function, high-volume embedded controllers where ROM-based firmware and proven reliability are prioritized over programmability or advanced peripherals.

Availability

DN3687GFPV is available at Aetrix Electronics and suitable for industrial motor control, office equipment firmware, building automation panels, and test & measurement instrumentation requiring stable component supply and long-term lifecycle support.

Supply support for DN3687GFPV 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 specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.

The H8 Family/H8/300H Tiny Series - including DN3687GFPV - was designed for cost-sensitive, resource-constrained embedded applications requiring deterministic real-time performance, low power consumption, and high noise immunity in factory and office environments.

FAQ

What is the maximum operating frequency supported by the DN3687GFPV?

The DN3687GFPV supports a maximum system clock frequency of 20 MHz when using an external crystal or ceramic resonator connected to the XIN/XOUT pins. This allows instruction execution at up to 20 million cycles per second, with critical instructions like MOV and ADD completing in one cycle. The device maintains timing compliance across its specified industrial temperature range (−40°C to +85°C) and supply voltage (4.5 V to 5.5 V). DN3687GFPV's clock generator includes prescalers that enable lower-frequency peripheral operation while maintaining full CPU speed.

Does the DN3687GFPV include on-chip flash memory or mask ROM?

DN3687GFPV contains mask-programmed ROM - not flash - with a fixed 32 KB capacity. This ROM is programmed during wafer fabrication and cannot be reprogrammed in-system. It provides high reliability and immunity to accidental overwrite, making DN3687GFPV ideal for high-volume, fixed-function applications where firmware stability is critical. Unlike flash variants such as HD64F3687G, DN3687GFPV does not support firmware updates after manufacturing, and its ROM content is locked at production.

How many I/O pins does the DN3687GFPV provide, and are they all individually configurable?

DN3687GFPV provides 80 programmable I/O pins distributed across Ports 0–7 and additional dedicated function pins. Each port has direction-control registers (e.g., DDR0, DDR1), allowing every pin to be configured independently as input, output, or alternate function (e.g., SCI, timer, ADC). Unused pins must be externally pulled high or low per Renesas' General Precautions to prevent floating inputs and internal leakage current. NC (no-connect) pins are explicitly marked in the pin function table and must remain unconnected.

What low-power modes are available on the DN3687GFPV, and how do they differ?

DN3687GFPV supports four distinct low-power modes: Sleep, Standby, Subsleep, and Subactive. In Standby mode, the main clock stops while the subclock (32.768 kHz) remains active, enabling RTC operation and wake-up via external interrupt or timer - consuming less than 10 µA. Sleep mode halts both clocks but retains RAM and register contents. Subsleep and Subactive modes selectively disable peripheral modules to optimize power versus responsiveness. All modes are entered and exited via SYSCR1/SYSCR2 register writes, and their behavior is fully documented in Section 6 of the H8/3687 Group Hardware Manual. DN3687GFPV's power management is hardware-assisted and deterministic.

Is the DN3687GFPV pin-compatible with other members of the H8/3687 Group?

Yes, DN3687GFPV shares identical pinout and package (100-pin PQFP) with other H8/3687 Group variants including HD64N3687G, HD64F3687G, and HD6433687G. Pin functions - including power, reset, clock, I/O, and peripheral mappings - are consistent across the group, enabling hardware design reuse. However, differences exist in memory type (mask ROM vs. flash), factory-programmed options, and minor electrical characteristics (e.g., max clock rating), so firmware and timing validation must still be performed per specific variant. DN3687GFPV's pin compatibility simplifies migration paths within the same family.