Renesas UPD78F0485GC(S)-GAD-AX

Overview

UPD78F0485GC(S)-GAD-AX from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K0/LF3 family, featuring integrated LCD controller/driver, 64 KB on-chip Flash memory, 4 KB RAM, and 48-pin LQFP package. It operates at up to 20 MHz, supports 10-bit ADC with 16 channels, and targets embedded control applications requiring segment-based display driving and low-power operation.

For engineers reviewing the UPD78F0485GC(S)-GAD-AX datasheet, UPD78F0485GC(S)-GAD-AX pinout, UPD78F0485GC(S)-GAD-AX application, or UPD78F0485GC(S)-GAD-AX equivalent, key selection criteria include LCD segment drive capability (up to 288 segments), Flash endurance (100,000 write/erase cycles), operating voltage range (2.7–5.5 V), and industrial temperature grade (−40°C to +85°C).

Technical Context

The UPD78F0485GC(S)-GAD-AX implements the 78K0 CPU core with 16-bit addressing, supporting 131 instructions and 8-level hardware stack. It integrates a 10-bit successive-approximation ADC with sample-and-hold, programmable gain amplifier input option, and conversion time of 1.2 μs per channel.

Its LCD controller supports static, 2-, 3-, and 4-multiplex drive modes with built-in bias generation, charge pump, and VLCD voltage regulation. The device includes 16-bit timer arrays (TAU), watchdog timer, real-time counter, and serial interfaces including CSI and UART.

Key Specifications

Pinout & Package

The UPD78F0485GC(S)-GAD-AX is housed in a 48-pin LQFP (7 mm × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined per Renesas User's Manual Rev.2.00 (R01UH0180EJ0200), Section 1.4.4 and 2.1.4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD78F0485GC(S)-GAD-AX, R5F104LEAFB#30 offers architectural modernization and lower power, while UPD78F0533GC-GAD-AX provides memory scalability within the same legacy ecosystem-both retain LCD controller functionality but differ in roadmap longevity and feature depth.

Availability

UPD78F0485GC(S)-GAD-AX is available at Aetrix Electronics and suitable for industrial control panels, home appliance displays, and portable medical instruments requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for UPD78F0485GC(S)-GAD-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, power, and SoC solutions for automotive, industrial, and IoT markets.

The 78K0/LF3 product line delivers cost-optimized 8-bit MCUs with integrated LCD controllers for display-centric embedded applications in appliances, instrumentation, and energy systems.

FAQ

What is the maximum LCD segment count supported by the UPD78F0485GC(S)-GAD-AX?

The UPD78F0485GC(S)-GAD-AX supports up to 288 LCD segments using its integrated controller in 4-multiplex mode with 8 COM lines and 40 SEG lines. This is confirmed in Section 1.1 (Features) and Section 4.1.4 (Port Functions) of the Renesas 78K0/Lx3 Hardware User's Manual Rev.2.00. The device allocates dedicated pins (COM0–COM7 and SEG0–SEG39) for this purpose, and no external segment drivers are required when operating within these limits.

Does the UPD78F0485GC(S)-GAD-AX include a real-time counter (RTC) with calendar function?

Yes, the UPD78F0485GC(S)-GAD-AX includes a dedicated real-time counter module that operates independently using a 32.768 kHz sub-clock source. As documented in Section 1.1 and Chapter 12 of the User's Manual, it supports calendar functions (year/month/day/hour/minute/second), alarm interrupts, and periodic interrupts - all retained during STOP mode with sub-clock active, enabling accurate timekeeping in battery-backed applications.

What is the Flash memory endurance specification for the UPD78F0485GC(S)-GAD-AX?

The UPD78F0485GC(S)-GAD-AX specifies 100,000 write/erase cycles for its 64 KB on-chip Flash memory, with a data retention period of 20 years at 85°C. This is stated in the Electrical Characteristics section (Section 24.2) of the Renesas datasheet and verified in the Flash Memory Programming Application Note U18954E. Each erase operation targets 128-byte blocks, and self-programming is supported in-application.

Can the UPD78F0485GC(S)-GAD-AX operate from a single 3.3 V supply?

Yes, the UPD78F0485GC(S)-GAD-AX operates across a supply voltage range of 2.7 V to 5.5 V, fully supporting 3.3 V nominal operation. Its I/Os are 5 V-tolerant on selected pins (e.g., P10–P17, P20–P27), and the internal voltage regulator (REGC pin) stabilizes core logic even under varying supply conditions. This is specified in Absolute Maximum Ratings and DC Characteristics tables (Sections 23–24) of the Hardware User's Manual.

Is the UPD78F0485GC(S)-GAD-AX pin-compatible with other 78K0/LF3 devices like UPD78F0471 or UPD78F0495?

The UPD78F0485GC(S)-GAD-AX shares the same 48-pin LQFP package and pin configuration with other 78K0/LF3 devices such as UPD78F0471 and UPD78F0495, as confirmed in Section 1.4.4 (Pin Configuration) of the User's Manual. However, peripheral enablement, memory size, and specific I/O alternate functions vary - for example, UPD78F0471 has only 32 KB Flash and lacks certain ADC channels. Full functional compatibility requires verification against individual device datasheets.