Renesas UPD78F0537AGK-GAJ-AX

Overview

UPD78F0537AGK-GAJ-AX from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K0/KE2 family, featuring 128 KB Flash memory, 8 KB RAM, and a maximum CPU clock of 20 MHz. It integrates a 10-bit A/D converter with 24 channels, UART, I²C, and 16-bit timer arrays, and operates across industrial temperature range (−40°C to +85°C) in a 100-pin LQFP package. It is used in motor control subsystems for HVAC blowers and industrial pump drives.

For engineers reviewing the UPD78F0537AGK-GAJ-AX datasheet, UPD78F0537AGK-GAJ-AX pinout, UPD78F0537AGK-GAJ-AX application, or UPD78F0537AGK-GAJ-AX equivalent, key selection criteria include Flash endurance (100,000 erase/write cycles), A/D conversion time (1.1 µs min), on-chip voltage regulator support, and compatibility with RA78K0 assembler toolchain.

Technical Context

The UPD78F0537AGK-GAJ-AX implements the 78K0 CPU core with 16-bit address space and supports both conventional- and expanded-specification modes. Its peripheral set includes three 16-bit timer arrays (each with capture/compare/PWM functions), a watchdog timer with independent clock source, and dual serial interfaces (UART ch0/ch1 and I²C).

It features a programmable on-chip voltage regulator (V_REG) outputting 3.3 V ±5% at up to 100 mA, enabling single-supply operation. The A/D converter supports simultaneous sampling on up to two channels and includes built-in reference voltage (AVREF = V_DD or internal 2.5 V).

Key Specifications

Pinout & Package

UPD78F0537AGK-GAJ-AX is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined per Renesas 78K0/KE2 hardware specification Rev.4.01, including dedicated reset, oscillator (X1/X2), and multiple I/O ports with alternate peripheral functions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD78F0537AGK-GAJ-AX, R5F104PJAFB#30 offers lower power and newer architecture but lacks on-chip regulation and high-speed A/D; UPD78F0536AGK-GAJ-AX provides pin-compatible migration path with reduced memory resources for cost-optimized implementations.

Availability

UPD78F0537AGK-GAJ-AX is available at Aetrix Electronics and suitable for motor control subsystems, industrial sensor hubs, and smart power outlets requiring stable component supply and long-term lifecycle support.

Supply support for UPD78F0537AGK-GAJ-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 industrial, automotive, and infrastructure markets.

The 78K0/KE2 product line delivers cost-optimized 8-bit MCUs targeting industrial motor control, building automation, and appliance applications with integrated analog peripherals and robust real-time performance.

FAQ

What is the maximum operating frequency of the UPD78F0537AGK-GAJ-AX?

The UPD78F0537AGK-GAJ-AX supports a maximum CPU clock frequency of 20 MHz using an external crystal (1–20 MHz range on X1/X2). At this frequency, its shortest instruction cycle is 1.1 µs. The device also supports internal high-speed oscillator (HOCO) at 20 MHz with ±2% accuracy, usable as main clock when crystal startup time must be minimized.

Does the UPD78F0537AGK-GAJ-AX include an on-chip voltage regulator?

Yes, the UPD78F0537AGK-GAJ-AX integrates a programmable on-chip voltage regulator controlled via the REGC pin. When enabled, it outputs a regulated 3.3 V ±5% supply capable of delivering up to 100 mA, powering the core logic and most peripherals. An external 1 µF ceramic capacitor is required on the V_REG pin for stability.

How many A/D input channels does the UPD78F0537AGK-GAJ-AX support?

The UPD78F0537AGK-GAJ-AX supports 24 analog input channels (AN0–AN23) for its 10-bit successive-approximation A/D converter. Channels are mapped across Ports 0, 1, 4, and 5, with flexible selection via ADPC register. Simultaneous sampling on two channels is supported using dual A/D trigger sources.

Is the UPD78F0537AGK-GAJ-AX pin-compatible with other 78K0/KE2 devices?

Yes, the UPD78F0537AGK-GAJ-AX shares the same 100-pin LQFP package and pin assignment with other 78K0/KE2 devices including UPD78F0531AGK–UPD78F0537AGK and their expanded-specification variants (e.g., UPD78F0537AAGK). This allows direct substitution within the same package group when Flash/RAM requirements align.

What development tools are officially supported for the UPD78F0537AGK-GAJ-AX?

Renesas officially supports the UPD78F0537AGK-GAJ-AX with the RA78K0 assembler (Ver. 4.01), CC78K0 C compiler (Ver. 4.00), QB-MINI2 on-chip debug emulator, and PM+ IDE (Ver. 6.30). Flash programming is validated using PG-FP5 programmer per application note U18865E, and self-programming libraries are documented in U17516E.