Renesas UPD78F1003GB-GAF-AX

Overview

UPD78F1003GB-GAF-AX from Renesas Electronics is a 16-bit single-chip microcontroller in the 78K0R/KC3-L family, featuring 128 KB on-chip Flash memory, 8 KB RAM, and a 20 MHz max CPU clock. It integrates a 10-bit ADC (8 channels), UART, I²C, and 16-bit timer arrays, and operates from 2.7 V to 5.5 V. It targets industrial control panels requiring deterministic real-time response and low-power operation.

For engineers reviewing the UPD78F1003GB-GAF-AX datasheet, UPD78F1003GB-GAF-AX pinout, UPD78F1003GB-GAF-AX application, or UPD78F1003GB-GAF-AX equivalent, key selection criteria include Flash endurance (100k write/erase cycles), operating temperature range (−40°C to +85°C), and compatibility with RA78K0R toolchain and QB-MINI2 debug interface.

Technical Context

The UPD78F1003GB-GAF-AX implements the 78K0R CPU core with 16-bit ALU, 24-bit address space, and Harvard architecture. It supports interrupt nesting with 128 vector entries and includes a watchdog timer with independent clock source (15 kHz LVI oscillator).

On-chip peripherals include a 10-bit successive-approximation ADC with sample-and-hold, programmable gain amplifier input option on selected channels, and dual UARTs supporting asynchronous mode with framing error detection and break signal generation.

Key Specifications

Pinout & Package

UPD78F1003GB-GAF-AX is housed in a 48-pin LQFP package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Renesas User's Manual Rev.4.00, Section 1.4.1 and 2.1.1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with R5F100PLGSP and STM32F072CBT6, the UPD78F1003GB-GAF-AX delivers higher analog subsystem integration (PGA-capable ADC inputs, dedicated AVREF), deterministic interrupt latency under 1.2 μs, and proven qualification for industrial temperature cycling - making it optimal for embedded control where analog fidelity and timing predictability outweigh raw clock speed or peripheral diversity.

Availability

UPD78F1003GB-GAF-AX is available at Aetrix Electronics and suitable for industrial HMI panels, smart sensor nodes, and motor drive controllers requiring stable component supply across multi-year production cycles.

Supply support for UPD78F1003GB-GAF-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 management ICs for industrial, automotive, and infrastructure markets.

The 78K0R/KC3-L product line, including UPD78F1003GB-GAF-AX, was designed for cost-effective, high-reliability embedded control in factory automation, building systems, and appliance applications requiring robust analog integration and long-term supply stability.

FAQ

What is the maximum operating frequency of the UPD78F1003GB-GAF-AX?

The UPD78F1003GB-GAF-AX supports a maximum CPU clock frequency of 20 MHz, achieved using its internal PLL with external crystal or ceramic resonator. At this frequency, the 78K0R core delivers 19.6 MIPS performance. The device also supports lower-frequency modes (e.g., 1 MHz sub-clock for RTC) to reduce power consumption in sleep states. All timing specifications in the electrical characteristics table assume operation within the validated 20 MHz limit.

Does the UPD78F1003GB-GAF-AX support in-system programming (ISP)?

Yes, the UPD78F1003GB-GAF-AX supports in-application programming (IAP) via its on-chip Flash memory, enabling firmware updates without removing the device from the target board. Programming is performed through the single-wire debug (SWD) interface using Renesas' Flash development toolkit and QB-MINI2 emulator. The Flash is rated for 100,000 write/erase cycles, and sector erase granularity allows partial reprogramming while preserving critical configuration data.

What are the power supply requirements for the UPD78F1003GB-GAF-AX?

The UPD78F1003GB-GAF-AX requires two supply domains: VDD/EVDD (2.7 V to 5.5 V) for I/O and analog circuitry, and an internally regulated 1.8 V core supply generated by an on-chip LDO controlled via the REGC pin. A 1.0 μF ceramic capacitor must be connected between REGC and VSS for stable regulation. AVREF may be tied to VDD or driven externally for improved ADC accuracy. All supplies must meet ripple and decoupling requirements specified in Section 21.2 of the hardware manual.

How many ADC channels does the UPD78F1003GB-GAF-AX have, and what is their resolution?

The UPD78F1003GB-GAF-AX integrates a 10-bit successive-approximation ADC with 8 input channels (AN00–AN07). Conversion time is 1.2 μs per sample under typical conditions. Channels AN00–AN03 support optional programmable gain amplifier (PGA) input stages, enabling high-resolution measurement of low-amplitude sensor signals without external op-amps. The ADC uses AVREF as reference and supports hardware triggering from timer overflow or external events.

Is the UPD78F1003GB-GAF-AX pin-compatible with other members of the 78K0R/KC3-L family?

Yes, the UPD78F1003GB-GAF-AX shares identical pinout and package (48-pin LQFP) with other 48-pin 78K0R/KC3-L devices including μPD78F1000, 78F1001, and 78F1002. Differences lie in Flash size (128 KB vs. 64 KB or 96 KB), RAM capacity, and peripheral enablement - all managed via software configuration. This allows hardware reuse across variants during prototyping and design scaling, provided firmware accounts for memory map and feature availability differences.