Renesas UPD78F0502AFC-AA3-A

Overview

UPD78F0502AFC-AA3-A from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K0/Kx2 family, featuring 32 KB on-chip Flash memory, 2 KB RAM, and a 16-bit timer/counter with PWM output capability. It operates at up to 20 MHz using an external crystal (1–20 MHz) or internal high-speed oscillator (16 MHz), supports 10-bit ADC with 8 channels, and targets embedded control in industrial sensors and motor drive interfaces.

For engineers reviewing the UPD78F0502AFC-AA3-A datasheet, UPD78F0502AFC-AA3-A pinout, UPD78F0502AFC-AA3-A application, or UPD78F0502AFC-AA3-A equivalent, key selection criteria include its 48-pin LQFP package, 10-bit ADC resolution, Flash rewrite endurance (10,000 cycles), operating voltage range (2.7–5.5 V), and support for I²C and UART peripheral interfaces.

Technical Context

The UPD78F0502AFC-AA3-A implements the 78K0 CPU core with 16-bit addressing, supporting 131 instructions and a 1- to 12-clock-cycle execution model. It integrates a 10-bit successive-approximation ADC with sample-and-hold, programmable conversion start triggers (software, timer, external), and selectable reference voltages (AVREF or VDD).

Its clock system includes dual oscillators: an external main system clock (X1) supporting 1–20 MHz crystals, and an internal high-speed oscillator (16 MHz ±2%) usable as a backup or low-power source. The device uses a single power supply (VDD/EVDD = 2.7–5.5 V) with separate analog ground (AVSS) and digital ground (VSS/EVSS) pins for noise isolation.

Key Specifications

Pinout & Package

This device 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.4.01 (2010), Section 2.1.1 for 78K0/KB2 series.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD78F0502AFC-AA3-A, R5F100PLAFB#30 offers superior power efficiency but requires migration from RA78K0 to CC-RL toolchains, while UPD78F0501AFC-AA3-A provides identical functionality with half the Flash-ideal for firmware-constrained cost-optimized systems.

Availability

UPD78F0502AFC-AA3-A is available at Aetrix Electronics and suitable for industrial sensor nodes, small motor controllers, and home appliance HMI systems requiring stable component supply over extended production lifecycles.

Supply support for UPD78F0502AFC-AA3-A 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/Kx2 product line delivers cost-optimized 8-bit MCUs for resource-constrained embedded control, emphasizing Flash reliability, mixed-signal integration, and long-term industrial availability.

FAQ

What is the maximum operating frequency of the UPD78F0502AFC-AA3-A?

The UPD78F0502AFC-AA3-A supports a maximum system clock frequency of 20 MHz when using an external crystal oscillator (X1) in the 1–20 MHz range. Alternatively, its internal high-speed oscillator operates at 16 MHz ±2%, enabling full-speed operation without external timing components. Both clock sources feed the same CPU core and peripherals, with no performance penalty for internal oscillator use.

Does the UPD78F0502AFC-AA3-A include hardware debug support?

Yes, the UPD78F0502AFC-AA3-A features on-chip debug functionality accessible via the single-wire debug (SWD) interface on pin P130. This allows real-time program execution control, register inspection, and breakpoint setting using Renesas' QB-MINI2 emulator or compatible tools. No external debug header is required, reducing PCB complexity during development and validation phases.

What is the Flash memory endurance specification for the UPD78F0502AFC-AA3-A?

The UPD78F0502AFC-AA3-A guarantees 10,000 write/erase cycles for its 32 KB on-chip Flash memory, with data retention specified for 100 years at Ta = 25°C. This endurance rating applies to standard erase/write operations using the official Renesas self-programming library (U17516E), and is validated across the full operating voltage (2.7–5.5 V) and temperature (−40 to +85°C) ranges.

Can the UPD78F0502AFC-AA3-A operate from a single 3.3 V supply?

Yes, the UPD78F0502AFC-AA3-A operates reliably across 2.7–5.5 V, making 3.3 V a fully supported supply voltage. At 3.3 V, it maintains full 20 MHz operation with external crystal or 16 MHz with internal oscillator. All I/O pins are 5 V tolerant when configured as inputs, allowing direct interfacing with higher-voltage logic without level shifters.

How many analog input channels does the built-in ADC support on the UPD78F0502AFC-AA3-A?

The UPD78F0502AFC-AA3-A integrates a 10-bit successive-approximation ADC with 8 dedicated analog input channels (AN0–AN7), mapped to port P10–P17. These channels support software, timer, or external trigger initiation, and allow selection between AVREF or VDD as reference voltage-enabling flexible sensor interfacing across varying precision and supply constraints.