Renesas UPD78F0034BGB-8EU-A

Overview

UPD78F0034BGB-8EU-A from Renesas Electronics is a flash-memory-based 8-bit microcontroller in the 78K/0 Series, serving as a system control unit with integrated 32 KB on-chip program memory, 10-bit 8-channel A/D converter, and three serial interfaces (two 3-wire + one UART). It operates across 1.8–5.5 V supply and supports industrial temperature range (–40 to +85°C), targeting embedded control in office automation and consumer audio equipment.

For engineers reviewing the UPD78F0034BGB-8EU-A datasheet, UPD78F0034BGB-8EU-A pinout, UPD78F0034BGB-8EU-A application, or UPD78F0034BGB-8EU-A equivalent, key selection criteria include its 64-pin LQFP package, 51 I/O pins (including four 5-V-tolerant N-ch open-drain outputs), 0.24 µs minimum instruction cycle at 8.38 MHz, and dual-power-domain design (VDD0/VDD1, VSS0/VSS1) for analog/digital noise isolation.

Technical Context

This device implements the 78K/0 CPU core with 8-bit × 32 register banks, supporting multiply/divide, BCD adjust, and bit-manipulation instructions. Its peripheral set includes one 16-bit timer/event counter (with capture/compare and 8-bit PWM output), two 8-bit timers, watchdog and watch timers, and programmable clock/buzzer outputs.

The A/D converter features 10-bit resolution, AVDD-supplied operation from 2.7–5.5 V, and hardware-triggered conversion via ADTRG (P03) or internal timer events. Serial interface channels are independently configurable: SI30/SO30/SCK30 and SI31/SO31/SCK31 support synchronous 3-wire mode, while RxD0/TxD0/ASCK0 implement full-duplex UART with selectable baud rates.

Key Specifications

Pinout & Package

UPD78F0034BGB-8EU-A is housed in a 64-pin plastic LQFP (12 × 12 mm, 0.5 mm pitch), with separate analog/digital power (AVDD, VDD0, VDD1) and ground (AVSS, VSS0, VSS1) domains to minimize noise coupling into the A/D subsystem.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with UPD78F0034BGB-8EU-A, the QFP variant offers identical functionality but different mechanical fit, while the RL78/G13 provides architectural upgrades and power savings at the cost of peripheral compatibility and pinout continuity - making the former a layout-adjustment alternative and the latter a next-generation migration path.

Availability

UPD78F0034BGB-8EU-A is available at Aetrix Electronics and suitable for office automation equipment, consumer audio systems, home appliance motor control, and industrial sensor hubs requiring stable component supply across extended production lifecycles.

Supply support for UPD78F0034BGB-8EU-A 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, and power solutions for industrial, automotive, and consumer markets.

The UPD78F0034BGB-8EU-A belongs to the legacy 78K/0 Series, designed specifically for cost-sensitive, low-to-mid complexity embedded control applications where flash programmability, analog integration, and robust I/O flexibility are prioritized over ultra-low power or advanced connectivity.

FAQ

What is the maximum operating frequency and corresponding instruction cycle time for UPD78F0034BGB-8EU-A?

The UPD78F0034BGB-8EU-A achieves a minimum instruction execution time of 0.24 µs when operating at its maximum main system clock frequency of 8.38 MHz. This timing assumes optimal conditions including proper decoupling, stable VDD within 1.8–5.5 V, and correct crystal load capacitance on X1/X2. The device also supports a 32.768 kHz subsystem clock for low-power watch timer operation.

Does UPD78F0034BGB-8EU-A support hardware-triggered A/D conversion, and how is it implemented?

Yes, UPD78F0034BGB-8EU-A supports hardware-triggered A/D conversion via the ADTRG function assigned to pin P03/INTP3. Asserting a falling edge on this pin initiates a conversion sequence without CPU involvement, ensuring deterministic timing for closed-loop control or synchronized sampling. The A/D module retains full 10-bit resolution and operates across AVDD = 2.7–5.5 V.

How many independent serial interfaces does UPD78F0034BGB-8EU-A provide, and what protocols do they support?

The UPD78F0034BGB-8EU-A provides three independent serial interfaces: two synchronous 3-wire channels (SI30/SO30/SCK30 and SI31/SO31/SCK31) supporting SPI-like communication, and one full-duplex UART channel (RxD0/TxD0/ASCK0) with programmable baud rate generation. All three operate concurrently and share no hardware resources, enabling simultaneous sensor polling and host telemetry.

What is the I/O structure of UPD78F0034BGB-8EU-A, and which pins offer 5-V tolerance?

The UPD78F0034BGB-8EU-A provides 51 I/O pins across eight ports. Four pins - P30 through P33 - are configured as N-ch open-drain outputs with 5-V withstand voltage, allowing direct interface with 5-V peripherals without level shifters. Other I/Os are CMOS-compatible with VDD-referenced logic levels; ANI0–ANI7 (P10–P17) are input-only analog channels.

What packaging and thermal specifications apply to UPD78F0034BGB-8EU-A?

UPD78F0034BGB-8EU-A is supplied in a 64-pin plastic LQFP package measuring 12 × 12 mm with 0.5 mm lead pitch. Its specified operating ambient temperature range is –40 to +85°C, qualifying it for industrial-grade applications. The package uses separate VDD0/VSS0 and VDD1/VSS1 power/ground pairs to isolate digital I/O noise from core logic and analog subsystems.