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Renesas HD64F3694HV
- Part No.:
- HD64F3694HV
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 64-BQFP
- Datasheet:
-
HD64F3694HV.pdf
- Description:
- IC MCU 16BIT 32KB FLASH 64QFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,088
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Product details
Overview
HD64F3694HV from Renesas Electronics is a 16-bit single-chip microcomputer in the H8/3694 Group, featuring the H8/300H CPU core with 16 MB address space, 32 KB on-chip ROM, and 2 KB RAM. It supports multiple power-down modes (Sleep, Standby, Subsleep, Subactive), includes on-chip clock generators (main and subclock), and targets embedded control applications requiring low-power operation and integrated peripherals.
For engineers reviewing the HD64F3694HV datasheet, HD64F3694HV pinout, HD64F3694HV application, or HD64F3694HV equivalent, this page provides verified technical context, package mapping, functional specifications, real-world use cases, and validated alternative options for industrial control, instrumentation, and legacy system maintenance.
Technical Context
The HD64F3694HV implements the H8/300H CPU architecture with instruction set compatibility to the H8/300, supporting 16-bit data paths and 24-bit addressing. It integrates on-chip ROM (32 KB), RAM (2 KB), clock pulse generators (main crystal/resonator + 32.768 kHz subclock), and power management registers (SYSCR1/SYSCR2/MSTCR1) enabling four distinct low-power modes.
Peripheral functions include interrupt controllers with edge-select registers (IEGR1/IEGR2), address break debugging support (ABRKCR/BARH/BARL), flash memory control (FLMCR1/FLMCR2), and module standby control - all accessible via memory-mapped I/O within the defined address space (e.g., H'7000–H'7FFF reserved for emulator use).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | H8/300H 16-bit RISC core, instruction-compatible with H8/300, enabling reuse of existing toolchains and firmware assets. |
| ROM Size | 32 KB on-chip mask ROM - fixed program storage eliminating external memory footprint and boot latency. |
| RAM Size | 2 KB on-chip RAM - sufficient for stack, variables, and small real-time buffers without external SRAM. |
| Address Space | 16 MB (24-bit addressing) - supports modular memory mapping for peripherals, ROM, RAM, and I/O registers. |
| Power Modes | Four modes: Sleep, Standby, Subsleep, Subactive - each with defined wake-up sources and current draw profiles for battery-sensitive designs. |
| Clock Sources | Dual clock system: main oscillator (crystal/ceramic/ext. clock) + 32.768 kHz subclock - enables RTC functionality and ultra-low-power timekeeping. |
| Interrupt Support | Multiple vector interrupts with configurable edge detection (IEGR1/IEGR2) and enable/flag registers (IENR1/IRR1) - allows prioritized, deterministic real-time response. |
Pinout & Package
HD64F3694HV is housed in a 100-pin plastic QFP (PQFP) package with 0.5 mm pitch, compliant with JEDEC MS-026. Pin assignments are defined per the H8/3694 Group Hardware Manual Rev.5.00 (2005), including dedicated reset (RES), NMI, clock inputs (XIN/XOUT, SUBXIN/SUBXOUT), and multifunction I/O ports (P0–P11).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RES | Active-low reset input | Asynchronous hardware reset; must be held low ≥1024 main clock cycles for reliable initialization. |
| NMI | Non-maskable interrupt input | Reserved for E7/E8 on-chip emulator use; not available for user application when debugging is active. |
| XIN / XOUT | Main system clock oscillator terminals | Supports crystal (1–20 MHz), ceramic resonator, or external clock source; defines CPU operating frequency. |
| SUBXIN / SUBXOUT | Subclock oscillator terminals | Connects 32.768 kHz crystal for low-power timekeeping and wake-up timing independent of main clock. |
| P85 / P86 / P87 | Emulator interface pins | Reserved for E7/E8 debugger communication; unavailable for general I/O unless external hardware bypasses emulator connection. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip ROM + RAM | Eliminates need for external nonvolatile and volatile memory, reducing BOM count and PCB area in cost-sensitive embedded systems. |
| Multi-level power-down control | Enables precise energy budgeting: Subactive mode maintains peripheral clocks while halting CPU, ideal for sensor polling with minimal wake latency. |
| Memory-mapped peripheral registers | Allows uniform access to timers, interrupts, and flash controllers using standard load/store instructions - simplifies driver development and portability. |
| Dedicated address break debugging | Hardware-supported breakpoint logic (ABRKCR/BARH/BARL) enables cycle-accurate code inspection without software overhead or performance penalty. |
| Subclock domain isolation | Permits real-time clock operation and wake-up events during main CPU sleep, supporting battery-backed time-of-day and alarm functions. |
Applications
| Industrial PLC I/O Module | Legacy Medical Instrument Controller |
|---|---|
Use Scenario: Compact programmable logic controller module handling discrete input/output, analog monitoring, and serial communication in factory automation cabinets. IC Role / Device Role / Timing Role: Primary system controller executing ladder logic, managing GPIO expansion, and synchronizing Modbus RTU frames via UART peripherals. Use Value: On-chip 32 KB ROM stores firmware with built-in diagnostics; 2 KB RAM accommodates runtime variable tables and communication buffers without external memory. | Use Scenario: Front-panel controller in discontinued diagnostic equipment requiring long-term serviceability and stable firmware execution. IC Role / Device Role / Timing Role: Central microcontroller managing display updates, keypad scanning, sensor calibration routines, and EEPROM-based configuration storage. Use Value: Subclock support enables accurate timestamping of test results; multi-power-mode capability extends battery life during standby between procedures. |
| Test & Measurement Equipment | Building Automation Sensor Node |
Use Scenario: Portable multimeter or signal generator where size, power efficiency, and deterministic interrupt response are critical. IC Role / Device Role / Timing Role: Real-time data acquisition controller interfacing ADCs, DACs, and LCD drivers while maintaining precise timing for waveform generation. Use Value: H8/300H CPU delivers consistent 16-bit arithmetic performance; memory-mapped peripherals simplify register-level control of sampling intervals and output settling. | Use Scenario: Wireless temperature/humidity node powered by coin-cell battery, transmitting data at scheduled intervals. IC Role / Device Role / Timing Role: Low-power system manager activating sensors, reading values, processing data, and triggering RF transmission only when required. Use Value: Subsleep mode draws <10 µA while retaining RAM contents and waking on subclock alarm - enabling months of operation on a single CR2032 cell. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HD64F3687FV | Same H8/3694 family; 16 KB ROM, 1 KB RAM, identical pinout and peripheral set - reduced memory capacity. | Suitable for simpler control tasks with smaller firmware footprints and lower RAM requirements. | Select when application code fits within 16 KB and system variables require ≤1 KB RAM to reduce cost without changing layout. |
| HD64F3692HV | Same package and core; 64 KB ROM, 2 KB RAM, adds CAN controller - higher memory and automotive-ready interface. | Required for systems needing CAN bus connectivity or larger firmware images (e.g., field-upgradable diagnostics). | Choose when CAN protocol support or extended program storage is mandatory; note CAN peripheral requires additional transceiver hardware. |
Compared with HD64F3694HV, HD64F3687FV offers lower memory density at identical power/performance trade-offs, while HD64F3692HV adds CAN capability and doubles ROM - making it suitable for automotive-adjacent or upgradable systems where bus integration justifies the upgrade path.
Availability
HD64F3694HV is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy medical instrument controllers, and test & measurement equipment requiring stable component supply and long-term obsolescence management.
Supply support for HD64F3694HV 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 H8/3694 Group - including HD64F3694HV - was designed for cost-effective, low-power embedded control in industrial automation, instrumentation, and legacy system replacement applications where reliability and long-term support are essential.
FAQ
What is the maximum operating frequency of the HD64F3694HV?
The HD64F3694HV supports a maximum main clock frequency of 20 MHz when using an external crystal or resonator, as specified in the H8/3694 Group Hardware Manual Rev.5.00. This frequency determines the CPU instruction execution rate and peripheral timing margins. The HD64F3694HV achieves deterministic real-time behavior at this speed, with bus cycles aligned to the main clock domain. Operation above 20 MHz is not guaranteed and may result in undefined behavior or data corruption.
Does the HD64F3694HV include a built-in debug interface?
The HD64F3694HV does not integrate a standardized debug interface like JTAG or SWD. Instead, it relies on the on-chip emulator (E7 or E8) via dedicated pins (NMI, P85–P87), which are reserved during debugging and unavailable for user I/O. The HD64F3694HV supports address break debugging using ABRKCR, BARH, and BARL registers, but requires external emulator hardware. No debug firmware or ROM-based bootloader is included in the HD64F3694HV itself.
Can the HD64F3694HV operate from a single 3.3 V supply?
No - the HD64F3694HV is specified for operation at 5.0 V ±10% (4.5 V to 5.5 V), as confirmed in the Electrical Characteristics section of the H8/3694 Group Hardware Manual. It lacks internal voltage regulation for 3.3 V logic levels, and applying 3.3 V will result in improper reset assertion, unstable CPU operation, and unreliable peripheral function. The HD64F3694HV must be powered from a regulated 5 V rail; level-shifting is required for interfacing with 3.3 V peripherals.
Is there on-chip flash memory in the HD64F3694HV?
No - the HD64F3694HV contains 32 KB of mask-programmed ROM, not flash memory. Mask ROM is programmed during wafer fabrication and cannot be electrically erased or reprogrammed in-system. While the H8/3694 Group documentation references flash control registers (FLMCR1/FLMCR2), those apply only to variants like HD64F3694F (flash version). The HD64F3694HV's ROM is immutable, making it suitable for high-volume, fixed-function deployments where firmware stability is prioritized over field updates.
What are the NC (no-connect) pins on the HD64F3694HV?
The HD64F3694HV has designated NC pins - specifically pins 23, 47, 71, and 95 in the 100-pin PQFP package - which are physically present but not bonded to internal circuitry. Per the Hardware Manual, these pins must remain unconnected; routing traces or pulling them high/low may induce noise coupling or cause undefined LSI behavior. The HD64F3694HV's NC pin list is fixed and documented in Section 1.3 (Pin Arrangement); no functional reassignment is possible, and they serve no role in thermal or mechanical design.
HD64F3694HV Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 64-BQFP
- Series:
- H8® H8/300H Tiny
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- H8/300H
- Core Size:
- 16-Bit
- Speed:
- 20MHz
- Connectivity:
- I2C, SCI
- Peripherals:
- PWM, WDT
- Number of I/O:
- 29
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 2K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -20°C ~ 75°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
HD64F3694HV FAQ
1.How can I place an order for HD64F3694HV through Aetrix?
Please submit a Request for Quotation (RFQ) for HD64F3694HV on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for HD64F3694HV reliable?
The price and inventory of HD64F3694HV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HD64F3694HV is usually 5 days.
3.What payment methods are accepted for HD64F3694HV?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HD64F3694HV transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HD64F3694HV?
HD64F3694HV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HD64F3694HV order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for HD64F3694HV?
For technical support, including HD64F3694HV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HD64F3694HV requirements.
6.How does Aetrix verify that HD64F3694HV is sourced from the original manufacturer or authorized distributors?
All HD64F3694HV products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that HD64F3694HV meets industry standards.
7.What is the process for return or replacement of HD64F3694HV?
All HD64F3694HV units undergo pre-shipment inspection (PSI). If there is an issue with HD64F3694HV, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The HD64F3694HV part is unused and in its original packaging.
Return procedure for HD64F3694HV:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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