Renesas UPD78F0503AMCA2-CAB-G

Overview

UPD78F0503AMCA2-CAB-G from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K0/Kx2 family, featuring 64 KB flash memory, 4 KB RAM, and a 20 MHz max CPU clock. It integrates UART, I²C, 10-bit ADC (8 channels), and 16-bit timer/counters for embedded control in industrial and consumer systems.

For engineers reviewing the UPD78F0503AMCA2-CAB-G datasheet, UPD78F0503AMCA2-CAB-G pinout, UPD78F0503AMCA2-CAB-G application, or UPD78F0503AMCA2-CAB-G equivalent, this page delivers verified technical context, package mapping, functional pin roles, real-world use cases, and validated alternative options for design-in and BOM continuity.

Technical Context

The UPD78F0503AMCA2-CAB-G implements the 78K0 CPU core with 16-bit address space and supports both internal high-speed oscillator (up to 20 MHz) and external crystal (1–20 MHz). It includes a 10-bit successive-approximation ADC with sample-and-hold and conversion time of 1.2 μs (typ.) at 20 MHz system clock.

On-chip peripherals include two UART channels with automatic baud-rate detection, one I²C interface supporting standard/fast-mode (100/400 kbps), and four 16-bit timer/counters with input capture, output compare, and PWM generation capability - all synchronized to the same peripheral clock domain.

Key Specifications

Pinout & Package

UPD78F0503AMCA2-CAB-G is housed in a 100-pin LQFP (14 × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined per Renesas Hardware User's Manual Rev.4.01 (2010), Section 2.1.1 and Figure 2.1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD78F0503AMCA2-CAB-G, R5F100PLGSP#30 reduces active current by 35% but removes analog power domain isolation, while UPD78F0537AGC-UEU-AX retains full compatibility and doubles memory - making it ideal for long-lifecycle industrial deployments needing field-upgradable firmware.

Availability

UPD78F0503AMCA2-CAB-G is available at Aetrix Electronics and suitable for industrial motor control, smart home sensor hubs, building automation panels, and legacy equipment retrofit requiring stable component supply across multi-year production cycles.

Supply support for UPD78F0503AMCA2-CAB-G 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/Kx2 product line was designed for cost-sensitive, reliability-critical embedded control applications in factory automation, home appliances, and infrastructure equipment - emphasizing flash endurance, mixed-signal integration, and long-term supply stability.

FAQ

What is the maximum operating frequency of the UPD78F0503AMCA2-CAB-G?

The UPD78F0503AMCA2-CAB-G supports a maximum CPU clock frequency of 20 MHz, achievable using either the internal high-speed oscillator or an external crystal/resonator up to 20 MHz. This frequency enables 1.25 MIPS/MHz throughput for real-time control tasks such as motor commutation and sensor data processing within tight timing budgets.

Does the UPD78F0503AMCA2-CAB-G include an integrated voltage regulator?

Yes, the UPD78F0503AMCA2-CAB-G includes an on-chip voltage regulator controlled via the REGC pin, generating a stable 3.3 V supply for internal analog circuits including the ADC and reference voltage generator. This eliminates the need for an external LDO in most designs, simplifying power architecture and reducing bill-of-materials cost.

How many ADC input channels does the UPD78F0503AMCA2-CAB-G support?

The UPD78F0503AMCA2-CAB-G supports eight 10-bit ADC input channels (AN0–AN7), mapped to Port 1 pins P10–P17. Conversion time is 1.2 μs at 20 MHz system clock, and the ADC includes internal 2.5 V reference and sample-and-hold functionality - enabling precise, low-latency analog measurements in noisy industrial environments.

Is the UPD78F0503AMCA2-CAB-G pin-compatible with other 78K0/Kx2 devices?

Yes, the UPD78F0503AMCA2-CAB-G shares the same 100-pin LQFP package and pinout with other 78K0/KB2 devices in the same density class (e.g., UPD78F0500AMCA2-CAB-G, UPD78F0502AMCA2-CAB-G), allowing hardware reuse across variants differing only in flash size and peripheral enablement - provided the target device's memory and feature set meet application requirements.

What development tools are supported for the UPD78F0503AMCA2-CAB-G?

Renesas provides full toolchain support for the UPD78F0503AMCA2-CAB-G, including the RA78K0 assembler (Ver. 4.01), CC78K0 C compiler (Ver. 4.00), QB-MINI2 on-chip debugger, and PM+ IDE. Application notes U17516E (Self Programming) and U17739E (Flash Programming) document production programming workflows compatible with PG-FP5 programmers and third-party flash utilities.