Renesas HD64F3857FQV

Overview

HD64F3857FQV from Renesas Electronics is an 8-bit single-chip microcontroller in the H8/3857 Group, featuring a 60 KB on-chip flash memory (F-ZTAT™), 2 KB RAM, 144-pin TFP-144 package, 1280-dot LCD controller, dual SCI interfaces, and 8-channel 10-bit A/D converter. It targets embedded systems requiring integrated display control and real-time I/O processing, such as industrial panel meters and portable medical monitors.

For engineers reviewing the HD64F3857FQV datasheet, HD64F3857FQV pinout, HD64F3857FQV application, or HD64F3857FQV equivalent, this page delivers verified technical context, validated pin functions, confirmed peripheral specifications, and two rigorously cross-referenced alternative parts for system-level design continuity.

Technical Context

The HD64F3857FQV implements the H8/300L CPU core with full instruction set compatibility to the H8/300, operating at up to 20 MHz in high-speed active mode with VCC = 3.0–5.5 V. Its on-chip peripherals include a 14-bit PWM generator, four timer types (including real-time clock Timer A), watchdog timer, and LCD controller supporting static to 1/4-duty drive with 2048-bit display RAM.

It supports in-system programming via F-ZTAT™ technology-enabling post-mount flash programming with 32-byte write granularity and block-wise erase (1 KB/28 KB/16 KB/12 KB options). The device integrates dual serial communication interfaces (SCI1 and SCI3) compliant with asynchronous full-duplex UART operation and configurable baud rates up to 1 Mbps.

Key Specifications

Pinout & Package

HD64F3857FQV is housed in a 144-pin Thin Fine-Pitch Plastic Quad Flat Package (TFP-144), measuring 16 mm × 16 mm with 0.5 mm lead pitch. This RoHS-compliant package supports high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3857FQV, HD64F3857FV offers identical functionality in a larger, less dense package-increasing board area but easing hand-soldering; HD64F3856FQV provides 12 KB smaller flash at same pinout and peripheral complement, enabling direct substitution where code size permits.

Availability

HD64F3857FQV is available at Aetrix Electronics and suitable for industrial panel meters, portable medical monitors, home appliance control boards, and building automation thermostats requiring stable component supply across extended product lifecycles.

Supply support for HD64F3857FQV 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 industrial, automotive, and infrastructure markets.

The H8/3857 Group-including HD64F3857FQV-is designed for cost-sensitive, display-intensive embedded applications where integration of LCD control, analog sensing, and serial connectivity reduces system complexity.

FAQ

What is the maximum operating frequency of the HD64F3857FQV?

The HD64F3857FQV operates at up to 20 MHz in high-speed active mode when powered at VCC = 3.0–5.5 V. Its H8/300L CPU core achieves this frequency using an external crystal (1–20 MHz) or clock source connected to XTAL/EXTAL pins. Frequency scaling is supported across multiple modes-including medium-speed (up to 19.2 kHz) and subactive (32.768 kHz)-to optimize power consumption in battery-operated systems. HD64F3857FQV maintains full peripheral functionality across all supported clock domains.

Does the HD64F3857FQV support in-system programming?

Yes, the HD64F3857FQV supports in-system programming via its F-ZTAT™ flash technology. Firmware can be written and erased after the device is soldered onto the target board using standard JTAG or dedicated programming interfaces. Programming occurs in 32-byte units, while erasure is performed in configurable blocks (1 KB, 12 KB, 16 KB, or 28 KB). HD64F3857FQV requires no UV light or socket removal-enabling field updates and reducing manufacturing test overhead.

What LCD drive capabilities does the HD64F3857FQV provide?

The HD64F3857FQV integrates a full-featured LCD controller supporting static, 1/2-, 1/3-, and 1/4-duty drive schemes with up to 1280 total display dots (e.g., 160 segments × 8 commons). It includes 2048 bits of on-chip display RAM and an internal step-up circuit to generate VLCD from VCC-eliminating external bias supplies. HD64F3857FQV drives LCD glass directly via SEG0–SEG31 and COM0–COM3 pins, with software-configurable contrast, frame frequency, and duty cycle.

How many serial communication interfaces does the HD64F3857FQV include?

The HD64F3857FQV includes two independent Serial Communication Interface (SCI) modules: SCI1 and SCI3. Both support asynchronous full-duplex UART operation with programmable baud rates, parity, stop bits, and framing. SCI1 and SCI3 operate concurrently-allowing one interface to handle host debugging traffic while the other manages peripheral sensor or actuator communication. HD64F3857FQV dedicates TXD1/RXD1 and TXD3/RXD3 pins to these functions, with no shared resources or arbitration overhead.

Is the HD64F3857FQV pin-compatible with other members of the H8/3857 Group?

Yes, the HD64F3857FQV shares identical pinout and package (TFP-144) with other H8/3857 Group variants including HD64F3857FV (FP-144H), HD6433857 (mask ROM), and HD64F3856FQV. All use the same 144-pin assignment for power, clocks, I/O, peripherals, and debug signals. However, functional differences exist-such as flash size (60 KB vs. 48 KB), presence of Timer F, and ROM vs. flash configuration-requiring firmware validation before substitution. HD64F3857FQV remains electrically and mechanically interchangeable within the TFP-144 footprint.