Renesas UPD78F0839GKA2-GAK-G

Overview

UPD78F0839GKA2-GAK-G from Renesas Electronics is a 16-bit CMOS microcontroller in the 78K0/DF2 family, featuring 128 KB on-chip Flash memory, 8 KB RAM, and integrated LCD controller with 4 COM × 4 SEG support. It operates at up to 20 MHz, supports 5V single-supply operation, and includes 10-bit ADC (8 channels), UART, I²C, and 16-bit timer arrays - deployed in industrial control panels and appliance user interfaces.

For engineers reviewing the UPD78F0839GKA2-GAK-G datasheet, UPD78F0839GKA2-GAK-G pinout, UPD78F0839GKA2-GAK-G application, or UPD78F0839GKA2-GAK-G equivalent, key selection criteria include its 64-pin LQFP package, LCD driver capability with internal bias generation, Flash endurance of 10,000 write/erase cycles, and qualification for Standard-grade industrial applications per Renesas quality classification.

Technical Context

The UPD78F0839GKA2-GAK-G implements the 78K0 CPU core with 16-bit architecture, Harvard memory structure, and instruction set compatible with earlier 78K0 devices. It integrates a programmable LCD controller supporting static and 1/2–1/4 duty drive modes, with dedicated segment/complement output pins and internal voltage follower for contrast control.

Peripheral subsystems include a 10-bit successive-approximation ADC with sample-and-hold, three 16-bit timer arrays (each with capture/compare/PWM functions), dual UART channels with LIN support, and an I²C-compatible serial interface operating up to 400 kHz. All peripherals are memory-mapped and controlled via SFRs in the 0xF000–0xFFFF address range.

Key Specifications

Pinout & Package

UPD78F0839GKA2-GAK-G is housed in a 64-pin LQFP (10 mm × 10 mm, 0.5 mm pitch) package with exposed thermal pad. Pin assignments follow Renesas standard 78K0/DF2 layout, including dedicated LCD segment/complement outputs (SEG0–SEG3, COM0–COM3), analog reference inputs (AVREF, AVSS), and dual UART/I²C signal pairs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F100PLAFB#30, UPD78F0839GKA2-GAK-G delivers integrated LCD driving and higher Flash density at the cost of higher active power; versus UPD78F0843GKA2-GAK-G, it offers identical functionality at lower cost where 128 KB Flash suffices.

Availability

UPD78F0839GKA2-GAK-G is available at Aetrix Electronics and suitable for industrial HMI panels, home appliance control units, smart meter interfaces, and factory automation terminals requiring stable component supply across multi-year production cycles.

Supply support for UPD78F0839GKA2-GAK-G 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 78K0/DF2 product line targets cost-sensitive, high-reliability embedded applications requiring integrated peripherals and robust 5 V operation - especially where LCD display, analog sensing, and deterministic real-time control are essential.

FAQ

What is the maximum operating frequency of the UPD78F0839GKA2-GAK-G and under what supply conditions?

The UPD78F0839GKA2-GAK-G operates at a maximum frequency of 20 MHz when supplied with VDD between 4.0 V and 5.5 V. This rating is specified across the full industrial temperature range (−40°C to +85°C) and requires proper decoupling (two 0.1 µF ceramics near VDD/EVDD pins) and stable REGC capacitor (1.0 µF). The internal PLL is not present; clock is derived directly from external crystal or ceramic resonator.

Does the UPD78F0839GKA2-GAK-G support in-system programming (ISP), and which interfaces are used?

Yes, the UPD78F0839GKA2-GAK-G supports in-system programming via its built-in bootloader. Programming is performed through UART0 (using RXD0/TXD0 pins) or I²C interface (using P10/P11 configured as SCL/SDA). No external programmer is required for field updates; however, the bootloader must be preserved during Flash writes, and security bits can lock ISP functionality if enabled.

How many LCD segments and commons does the UPD78F0839GKA2-GAK-G support, and what drive methods are available?

The UPD78F0839GKA2-GAK-G supports up to 4 common (COM0–COM3) and 4 segment (SEG0–SEG3) outputs, enabling static or 1/2–1/4 multiplexed LCD drive. It includes internal bias generation via programmable resistor ladder and voltage follower, eliminating need for external bias resistors. Drive capability is rated for 3 mA per segment/common, sufficient for standard character LCD modules.

What ADC features does the UPD78F0839GKA2-GAK-G provide, and how is conversion triggered?

The UPD78F0839GKA2-GAK-G integrates a 10-bit successive-approximation ADC with 8 input channels, ±1 LSB integral nonlinearity, and 1.2 µs typical conversion time. Triggers include software start, timer array overflow (TAi), external event (INTPn), or interval timer - enabling synchronized sampling without CPU intervention. AVREF can be tied to VDD or an external reference for ratiometric or absolute measurements.

Is the UPD78F0839GKA2-GAK-G pin-compatible with other members of the 78K0/DF2 family, and which models share the same 64-pin LQFP package?

Yes, the UPD78F0839GKA2-GAK-G is pin-compatible with all 78K0/DF2 devices in the 64-pin LQFP package, including UPD78F0838GKA2-GAK-G, UPD78F0840GKA2-GAK-G, UPD78F0842GKA2-GAK-G, UPD78F0843GKA2-GAK-G, and UPD78F0849GKA2-GAK-G. Pin functions are consistent across this group; differences lie only in Flash size, RAM allocation, and optional peripheral enablement - verified in Renesas Hardware User's Manual Rev.3.00 Section 1.4.