Renesas UPD78F0503AMC-CAB-AX

Overview

UPD78F0503AMC-CAB-AX from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K0/Kx2 family, featuring 64 KB on-chip Flash memory, 4 KB RAM, and a 16-bit CPU core operating at up to 20 MHz. It integrates UART, I²C, 10-bit ADC (8 channels), 16-bit timer arrays, and supports single-supply operation from 2.7 V to 5.5 V. It is used in industrial control panels and sensor interface modules requiring deterministic real-time response.

For engineers reviewing the UPD78F0503AMC-CAB-AX datasheet, UPD78F0503AMC-CAB-AX pinout, UPD78F0503AMC-CAB-AX application, or UPD78F0503AMC-CAB-AX equivalent, key selection criteria include Flash endurance (100,000 write/erase cycles), A/D conversion time (≤1.2 μs per channel), reset source flexibility (power-on, watchdog, voltage detector), and support for in-system programming via on-chip bootloader.

Technical Context

The UPD78F0503AMC-CAB-AX implements the 78K0S CPU core with 16-bit ALU and 8-bit data bus, executing instructions in 1–4 clock cycles. It features a programmable voltage detector (VDD = 2.7–5.5 V), on-chip oscillator (1–20 MHz crystal or ceramic resonator), and dual clock domains (main system clock and peripheral clock).

Its interrupt architecture supports 128 vector entries with priority levels configurable in 4 groups, enabling fast context switching for time-critical tasks such as motor commutation control and serial protocol handling. The device uses Renesas' SuperFlash® technology for reliable flash programming and retention of ≥20 years at 85°C.

Key Specifications

Pinout & Package

This device is housed in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad for enhanced heat dissipation in enclosed industrial enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD78F0503AMC-CAB-AX, R5F100LEAFB#30 offers superior active power efficiency but sacrifices integrated voltage monitoring, while STM8S105K4T6C reduces cost and complexity at the expense of field-upgradable firmware capability and industrial-grade reset reliability.

Availability

UPD78F0503AMC-CAB-AX is available at Aetrix Electronics and suitable for industrial motor drives, smart sensor nodes, PLC I/O modules, and medical diagnostic equipment requiring stable component supply across long production lifecycles.

Supply support for UPD78F0503AMC-CAB-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 automotive, industrial, and IoT markets.

The UPD78F0503AMC-CAB-AX belongs to the 78K0/Kx2 product line, designed specifically for cost-sensitive, high-reliability embedded control applications demanding deterministic real-time performance and long-term supply stability in industrial environments.

FAQ

What is the maximum operating frequency of the UPD78F0503AMC-CAB-AX?

The UPD78F0503AMC-CAB-AX operates at a maximum system clock frequency of 20 MHz, achieved using an external crystal or ceramic resonator connected to the X1/X2 pins. This frequency enables instruction execution in as little as 50 ns per cycle, supporting tight timing constraints in motor control and sensor sampling applications. The device also supports internal RC oscillation at 1 MHz for low-power standby modes.

Does the UPD78F0503AMC-CAB-AX support in-system programming (ISP)?

Yes, the UPD78F0503AMC-CAB-AX supports in-system programming via its on-chip bootloader and Renesas' Flash Self Programming Library (FSPL). This allows firmware updates through UART or other serial interfaces without removing the chip from the board. The UPD78F0503AMC-CAB-AX requires no external programming voltage and retains full functionality during reprogramming sequences.

What are the power supply requirements for the UPD78F0503AMC-CAB-AX?

The UPD78F0503AMC-CAB-AX requires two supply domains: VDD/EVDD (2.7 V to 5.5 V) for digital logic and I/O, and AVREF (2.5 V to VDD) for analog reference. Separate VSS/EVSS grounds must be used to minimize noise coupling. The device draws 12 mA typical at 20 MHz/5 V and enters HALT mode consuming only 1.5 μA, making it suitable for both mains-powered and battery-operated systems.

How many ADC channels does the UPD78F0503AMC-CAB-AX have, and what is their resolution?

The UPD78F0503AMC-CAB-AX integrates a 10-bit successive approximation register (SAR) ADC with 8 input channels (AN0–AN7), each selectable via software-controlled multiplexer. Conversion time is guaranteed ≤1.2 μs per sample, supporting sampling rates above 800 kSPS. The ADC includes built-in offset calibration and supports external reference voltage for improved measurement accuracy across temperature and supply variations.

Is the UPD78F0503AMC-CAB-AX pin-compatible with other members of the 78K0/Kx2 family?

No, the UPD78F0503AMC-CAB-AX is not universally pin-compatible across the 78K0/Kx2 family. While it shares the same 100-pin LQFP package with several variants (e.g., UPD78F0502AMC-CAB-AX), pin functions differ significantly between subfamilies (KB2 vs KC2 vs KD2). For example, timer output pins and serial interface assignments vary by model. Migration requires verification against the specific variant's pin function table in the Hardware User's Manual Rev.4.01.