Renesas HD6473834UH

Overview

HD6473834UH from Renesas Electronics is a single-chip H8/3834U Series microcontroller featuring an H8/300L CPU core, on-chip LCD controller/driver, 14-bit PWM, three-channel serial interface (SCI), and 8-channel 10-bit A/D converter - designed for embedded systems with integrated display and motor control functions such as industrial HMIs and portable instrumentation.

For engineers reviewing the HD6473834UH datasheet, HD6473834UH pinout, HD6473834UH application, or HD6473834UH equivalent, key selection considerations include its 100-pin PQFP package, 16 MHz max system clock, LCD segment drive capability (up to 128 segments), and support for multiple low-power modes including Sleep, Standby, and Watch modes.

Technical Context

The HD6473834UH implements the H8/300L CPU architecture with full instruction set compatibility to the H8/300, supporting 16-bit data processing and 24-bit addressing. It integrates dedicated peripheral modules including a programmable LCD controller with internal bias generation, five independent timers (including 16-bit free-run and input-capture types), and dual asynchronous SCI channels with framing and parity error detection.

Power management is handled via six operational modes - Active (medium-speed), Subactive, Subsleep, Watch, Standby, and Sleep - each with distinct clock source selection (main oscillator, subclock, or internal RC) and peripheral enable/disable granularity. The device supports in-system programming via on-chip PROM mode using external VPP and dedicated programming pins.

Key Specifications

Pinout & Package

HD6473834UH is housed in a 100-pin PQFP (Plastic Quad Flat Package) with standard 0.65 mm lead pitch and 14 mm × 20 mm body size. Pin assignment follows the H8/3834U Series standard layout, supporting multiplexed I/O, dedicated LCD segment/common outputs, and dedicated programming pins (VPP, PGMS, etc.) for PROM mode operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD6473834UH, HD64F3834F offers flash-based reprogrammability at the expense of higher unit cost and slightly reduced EEPROM endurance, while HD6433834U provides identical functionality in mask-ROM form - eliminating VPP dependency but forfeiting post-production firmware modification capability.

Availability

HD6473834UH is available at Aetrix Electronics and suitable for industrial HMI development, portable instrumentation design, and motor control module prototyping requiring stable component supply and long-term lifecycle support.

Supply support for HD6473834UH 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 consumer applications.

The H8/3834U Series was developed to serve cost-sensitive, display-integrated embedded systems - combining LCD driving, analog sensing, and real-time control in a single chip for applications like test equipment, building controls, and small appliances.

FAQ

What is the maximum operating frequency of the HD6473834UH?

The HD6473834UH supports a maximum system clock frequency of 16 MHz when driven by an external crystal or ceramic resonator connected to the XTAL/EXTAL pins. This frequency defines the upper limit for instruction execution speed, timer resolution, and serial baud rate generation. Operation above this rating may cause timing violations or functional instability. The HD6473834UH datasheet specifies AC characteristics only up to 16 MHz under recommended VCC conditions.

Does the HD6473834UH support in-system programming?

Yes, the HD6473834UH supports in-system programming via its PROM mode, which requires applying +12.5 V to the VPP pin and asserting the PGMS signal. Programming is performed externally using a compatible programmer that follows the H8/3834U PROM specification. Unlike flash-based variants, HD6473834UH PROM memory is one-time programmable and cannot be erased electrically after initial write.

How many LCD segments can the HD6473834UH drive directly?

The HD6473834UH integrates an LCD controller capable of driving up to 128 segments across four commons (COM0–COM3), supporting static, 2-mux, 3-mux, and 4-mux LCD configurations. Segment outputs (SEG0–SEG127) are CMOS drivers with sink capability up to 3 mA per pin. This eliminates the need for external LCD driver ICs in applications such as multimeters, thermostats, and industrial panel meters.

What low-power modes are available on the HD6473834UH?

The HD6473834UH implements six configurable low-power modes: Sleep, Standby, Watch, Subsleep, Subactive, and Active (medium-speed). In Sleep mode, CPU and most peripherals halt while RAM and registers retain state; typical current draw is under 10 µA at 5 V. Standby mode stops the main oscillator but retains subclock operation for RTC functions, enabling wake-up via external interrupt or timer event.

Is the HD6473834UH pin-compatible with other H8/3834U Series devices?

Yes, the HD6473834UH shares identical pinout and peripheral register mapping with other members of the H8/3834U Series, including HD6433834U and HD64F3834F. All use the same 100-pin PQFP package and assign identical functions to corresponding pins - such as SEG/COM lines, SCI channels, and timer I/O - enabling hardware design reuse across PROM, mask ROM, and flash variants.