Renesas UPD78F0485GK-GAK-M1-AX

Overview

UPD78F0485GK-GAK-M1-AX from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K0/LF3 family, featuring an integrated LCD controller/driver, 64 KB on-chip Flash memory, 4 KB RAM, and 29 I/O pins in a 64-pin LQFP package. It operates at up to 20 MHz, supports 10-bit ADC with 16 channels, and targets low-power embedded applications requiring segment-based display control.

For engineers reviewing the UPD78F0485GK-GAK-M1-AX datasheet, UPD78F0485GK-GAK-M1-AX pinout, UPD78F0485GK-GAK-M1-AX application, or UPD78F0485GK-GAK-M1-AX equivalent, this device is selected for cost-sensitive, display-integrated industrial controls, home appliance UIs, and portable instrumentation where Flash reprogrammability, LCD segment drive capability, and peripheral integration reduce BOM count and PCB area.

Technical Context

The UPD78F0485GK-GAK-M1-AX implements the 78K0 CPU core with 16-bit address space, supporting both ROM-based and RAM-based execution modes. Its LCD controller drives up to 288 segments (36 commons × 8 segments) using internal charge pump and adjustable bias voltage generation.

It integrates a 10-bit successive-approximation ADC with sample-and-hold, programmable conversion start triggers (software, timer, external), and built-in temperature sensor. Peripheral set includes UART, I²C-compatible serial interface, 16-bit timer arrays (TM00–TM02), watchdog timer, and power-on reset circuitry with selectable delay.

Key Specifications

Pinout & Package

UPD78F0485GK-GAK-M1-AX is housed in a 64-pin LQFP (10 mm × 10 mm, 0.5 mm pitch) package with exposed thermal pad. Pin assignment follows standard 78K0/LF3 layout per Renesas User's Manual Rev.2.00 (pp.32, 58–63).

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD78F0485GK-GAK-M1-AX, R5F104PJAFB#V0 offers modern toolchain and lower power but lacks LCD integration, while UPD78F0484GK-GAK-M1-AX provides identical functionality at reduced memory-making it a drop-in alternative only when firmware size permits.

Availability

UPD78F0485GK-GAK-M1-AX is available at Aetrix Electronics and suitable for home appliance control panels, industrial panel meters, and portable medical device UIs requiring stable component supply and long-term manufacturing continuity.

Supply support for UPD78F0485GK-GAK-M1-AX 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 consumer markets.

The 78K0/LF3 product line delivers cost-optimized 8-bit MCUs with integrated LCD controllers for display-centric embedded systems-designed to replace discrete display drivers and reduce system-level complexity in white goods and instrumentation.

FAQ

What is the maximum segment count supported by the UPD78F0485GK-GAK-M1-AX LCD controller?

The UPD78F0485GK-GAK-M1-AX LCD controller supports up to 288 segments (36 commons × 8 segments) in multiplexed configurations (1/2 to 1/4 duty). This is confirmed in Section 1.1 "Features" and Section 1.4.4 "Pin Configuration" of the Renesas 78K0/Lx3 User's Manual Rev.2.00. The device uses internal bias generation and charge pump to drive standard segment LCDs without external components.

Does the UPD78F0485GK-GAK-M1-AX include a hardware real-time counter (RTC)?

Yes, the UPD78F0485GK-GAK-M1-AX includes a dedicated real-time counter (RTC) module operating from a 32.768 kHz sub-clock source. As documented in Section 4.1.4 "Port Functions" and Section 13 "Real-Time Counter" of the User's Manual, it supports calendar functions (year/month/day/hour/min/sec) and alarm interrupts-enabling time-stamped logging in applications like energy meters and smart thermostats.

What is the Flash endurance rating for UPD78F0485GK-GAK-M1-AX, and how is it managed during firmware updates?

The UPD78F0485GK-GAK-M1-AX features 64 KB of on-chip Flash memory rated for 100,000 write/erase cycles. Firmware updates are performed via in-application programming (IAP) using the built-in bootloader, as described in Application Note U18954E. The device supports sector erase and byte/word programming, with checksum verification and interrupt masking during critical write operations to ensure data integrity.

Can the UPD78F0485GK-GAK-M1-AX operate from a single 3.3 V supply, and what are its voltage tolerance limits?

Yes, the UPD78F0485GK-GAK-M1-AX operates across a supply range of 2.7 V to 5.5 V, fully supporting 3.3 V nominal operation. Electrical specifications in Section 24 "DC Characteristics" confirm stable operation-including Flash programming-at 3.3 V ±10%. The device includes a programmable low-voltage detection (LVD) circuit with thresholds selectable at 2.7 V, 3.0 V, 3.3 V, or 3.6 V to prevent malfunction during brown-out conditions.

Is there an on-chip temperature sensor in the UPD78F0485GK-GAK-M1-AX, and what is its accuracy?

Yes, the UPD78F0485GK-GAK-M1-AX integrates a factory-calibrated on-die temperature sensor. Per Section 24.3 "ADC Characteristics" and Application Note U19542E, it delivers ±2°C accuracy over the –20°C to +70°C industrial temperature range. The sensor connects directly to the 10-bit ADC channel ADIN15 and requires no external components-enabling thermal monitoring in appliances and power supplies.