Renesas UPD78F8041K8(R)-9B4-E2-AX

Overview

UPD78F8041K8(R)-9B4-E2-AX from Renesas Electronics is a 16-bit single-chip microcontroller in the 78K0R family, featuring 128 KB Flash memory, 8 KB RAM, and integrated IO-Link transceiver interface support. It operates at up to 20 MHz, supports 5 V operation, and includes on-chip voltage regulator (VREGO), wake-up detection, and overcurrent protection control logic for industrial sensor node applications.

For engineers reviewing the UPD78F8041K8(R)-9B4-E2-AX datasheet, UPD78F8041K8(R)-9B4-E2-AX pinout, UPD78F8041K8(R)-9B4-E2-AX application, or UPD78F8041K8(R)-9B4-E2-AX equivalent, key selection criteria include IO-Link physical layer co-processing capability, dual-supply domain support (VDD_IO/VDDH), and dedicated ILIM/SILIM/WAKE signal handling for smart sensor interface design.

Technical Context

This MCU integrates hardware-level IO-Link communication control with dedicated pins (ILIM, SILIM, WAKE, CQ, REGC) and internal register mapping for mode switching between IO-Link and standard I/O (SIO). Its CPU core is based on the 78K0R architecture with 16-bit ALU, 24-bit address space, and instruction set compatible with RA78K0R toolchain.

The device implements separate power domains: VDDH (5.0 V) for high-side driver circuitry, VDD_IO (3.3–5.0 V) for digital I/O, and internal VREGO (3.3 V) for core logic. It supports programmable overcurrent shutoff thresholds via ILIM pin voltage selection and wakeup event detection via edge-triggered WAKE input with internal pull-up.

Key Specifications

Pinout & Package

UPD78F8041K8(R)-9B4-E2-AX is housed in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Renesas User's Manual Rev.3.00 (Sep 2010), including dedicated IO-Link control signals and multi-power-domain I/O grouping.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar IO-Link slave controller applications.

Compared with R5F578F80ADFP and MAX22515GTP+, UPD78F8041K8(R)-9B4-E2-AX delivers lowest system-level component count for cost-sensitive, space-constrained IO-Link sensors by combining MCU, regulator, and PHY control in one 100-pin LQFP package - eliminating external transceiver, LDO, and level-shifting components.

Availability

UPD78F8041K8(R)-9B4-E2-AX is available at Aetrix Electronics and suitable for industrial IO-Link sensors, smart field transmitters, and condition monitoring nodes requiring stable component supply across multi-year production cycles.

Supply support for UPD78F8041K8(R)-9B4-E2-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 global semiconductor manufacturer headquartered in Japan, specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The UPD78F8041K8(R)-9B4-E2-AX belongs to the 78K0R microcontroller family, designed specifically for cost-optimized, low-power industrial communication nodes with integrated IO-Link interface control and multi-rail power management.

FAQ

What is the primary function of the ILIM pin on the UPD78F8041K8(R)-9B4-E2-AX?

The ILIM pin on the UPD78F8041K8(R)-9B4-E2-AX is an analog input that sets the overcurrent shutoff threshold for the integrated IO-Link transmitter output stage. Applying a voltage between 0.5 V and 2.0 V selects one of eight discrete current limit levels (e.g., 100 mA to 300 mA), directly configuring fault protection behavior without firmware overhead. This enables robust operation across varying cable lengths and load conditions in industrial environments.

Does the UPD78F8041K8(R)-9B4-E2-AX require an external crystal oscillator?

Yes, the UPD78F8041K8(R)-9B4-E2-AX requires an external crystal connected between X1 and X2 pins for main system clock generation. The recommended frequency is 4–20 MHz, with typical use at 8 MHz or 16 MHz for IO-Link timing compliance. An internal high-speed RC oscillator is available for initial boot or fail-safe operation but lacks the stability needed for precise IO-Link baud rate generation.

How does the UPD78F8041K8(R)-9B4-E2-AX handle power supply domains?

The UPD78F8041K8(R)-9B4-E2-AX separates power domains into three distinct rails: VDDH (4.5–5.5 V) powers the IO-Link output stage, VDD_IO (3.3–5.0 V) supplies all general-purpose I/O ports, and VREGO (3.3 V) is generated internally from VDDH to power the CPU core and peripherals. This isolation prevents noise coupling and ensures reliable operation when driving high-current IO-Link loads while maintaining clean digital logic margins.

Can the UPD78F8041K8(R)-9B4-E2-AX operate in IO-Link SIO (Standard I/O) mode?

Yes, the UPD78F8041K8(R)-9B4-E2-AX supports both IO-Link communication mode and Standard I/O (SIO) mode. Mode selection is controlled via the CQ line state and internal register settings (e.g., IOLCTL register). In SIO mode, the device functions as a conventional digital I/O controller with programmable pull-ups/downs and interrupt capability - enabling backward compatibility with legacy wiring during commissioning or fallback operation.

What development tools are officially supported for the UPD78F8041K8(R)-9B4-E2-AX?

Officially supported tools for the UPD78F8041K8(R)-9B4-E2-AX include the QB-MINI2 on-chip debug emulator with programming function (U18371E), RA78K0R assembler (U18546E), CC78K0R C compiler (U18548E), and PG-FP5 flash programmer (U18865E). These tools are validated for the 78K0R architecture and fully support the UPD78F8041K8(R)-9B4-E2-AX's memory map, IO-Link peripheral registers, and low-power STOP mode debugging.