Renesas UPD78F8041K8(R)-9B4-AX

Overview

UPD78F8041K8(R)-9B4-AX from Renesas Electronics is a 16-bit single-chip microcontroller in the 78K0R family, featuring 128 KB Flash, 8 KB RAM, and integrated IO-Link transceiver interface support. It operates at up to 20 MHz, supports 5 V operation, and includes 8-channel 10-bit ADC, 32-bit timer, and UART/CSI/SIO peripherals. It targets industrial sensor nodes requiring real-time IO-Link communication and embedded control.

For engineers reviewing the UPD78F8041K8(R)-9B4-AX datasheet, UPD78F8041K8(R)-9B4-AX pinout, UPD78F8041K8(R)-9B4-AX application, or UPD78F8041K8(R)-9B4-AX equivalent, key selection criteria include IO-Link PHY integration, 5 V tolerant I/O, Flash memory endurance (100 k erase/write cycles), and compliance with IO-Link specification v1.1 for Class A devices.

Technical Context

The UPD78F8041K8(R)-9B4-AX implements the 78K0R/KE3 CPU core with 16-bit architecture, Harvard memory organization, and on-chip Flash memory programmed via on-chip debug interface. It integrates dedicated hardware blocks for IO-Link physical layer signaling including wake-up pulse detection, overcurrent protection, and baud rate switching between COM1 (4.8 kbps), COM2 (38.4 kbps), and COM3 (230.4 kbps).

It features dual power domains: IVDD (3.3 V for core logic) and VDD_IO (5 V for I/O and IO-Link transceiver interface), with internal voltage regulator (VREGO) supporting external supply stabilization. The device uses an external crystal (X1/X2) for main clock generation and supports PLL-based frequency multiplication to achieve 20 MHz system clock.

Key Specifications

Pinout & Package

UPD78F8041K8(R)-9B4-AX is housed in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are defined per Renesas User's Manual Rev.3.00 (Sep 2010), with dedicated terminals for IO-Link functionality and multi-function GPIO grouped by port.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller-with-IO-Link-interface applications.

Compared with UPD78F8041K8(R)-9B4-AX, R7F0C004M2DFB offers reduced Flash and no IO-Link hardware acceleration, while STM32G071KBT6 provides ARM toolchain advantages but lacks dedicated IO-Link peripheral logic - making UPD78F8041K8(R)-9B4-AX optimal for minimal-footprint, certified IO-Link endpoint designs.

Availability

UPD78F8041K8(R)-9B4-AX is available at Aetrix Electronics and suitable for industrial sensor nodes, valve positioners, and rotary encoder interfaces requiring stable component supply, long-term lifecycle support, and verified IO-Link v1.1 compliance.

Supply support for UPD78F8041K8(R)-9B4-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 solutions for industrial, automotive, and infrastructure markets.

The UPD78F8041K8(R)-9B4-AX belongs to the 78K0R/KE3 product line, designed specifically for cost-sensitive, high-reliability industrial endpoints requiring integrated IO-Link physical layer control and deterministic real-time operation.

FAQ

What is the maximum operating frequency of the UPD78F8041K8(R)-9B4-AX?

The UPD78F8041K8(R)-9B4-AX operates at a maximum system clock frequency of 20 MHz, achieved via internal PLL multiplication of an external crystal (X1/X2) input. This frequency is fully supported across the entire industrial temperature range (−40°C to +85°C) and under all specified supply voltage conditions (IVDD = 3.0–3.6 V, VDD_IO = 4.5–5.5 V). The UPD78F8041K8(R)-9B4-AX datasheet confirms timing margins remain valid at this speed without derating.

Does the UPD78F8041K8(R)-9B4-AX include on-chip Flash memory with error correction?

Yes, the UPD78F8041K8(R)-9B4-AX integrates 128 KB of on-chip Flash memory with built-in error correction code (ECC) capable of correcting single-bit errors and detecting double-bit errors during program execution. This ECC functionality is enabled by default and does not require software configuration. The UPD78F8041K8(R)-9B4-AX leverages this feature to ensure robust firmware integrity in electrically noisy industrial environments.

Can the UPD78F8041K8(R)-9B4-AX operate without an external crystal?

No - the UPD78F8041K8(R)-9B4-AX requires an external crystal connected to X1 and X2 pins for primary clock generation; it does not include a factory-trimmed RC oscillator sufficient for IO-Link timing accuracy. The device supports crystals from 1 to 20 MHz, with 8 MHz being typical for IO-Link COM2 mode. The UPD78F8041K8(R)-9B4-AX User's Manual specifies that internal oscillators alone cannot meet IO-Link jitter and stability requirements.

How many IO-Link-specific pins does the UPD78F8041K8(R)-9B4-AX provide?

The UPD78F8041K8(R)-9B4-AX provides five dedicated IO-Link hardware interface pins: WAKE (wake-up pulse detection), ILIM (overcurrent threshold select), SILIM (short-circuit current limit), REGC (regulator compensation), and CQ (clock output for external transceiver). These pins are electrically and functionally distinct from general-purpose GPIO and are documented in Section 3.2 of the UPD78F8041K8(R)-9B4-AX User's Manual Rev.3.00.

Is the UPD78F8041K8(R)-9B4-AX qualified for automotive applications?

No - the UPD78F8041K8(R)-9B4-AX is rated under Renesas' "Standard" quality grade, intended for industrial equipment, office automation, and consumer appliances. It is not qualified to AEC-Q100 or ISO/TS 16949 standards, and its temperature range (−40°C to +85°C) and reliability testing do not meet automotive requirements. For automotive IO-Link endpoints, Renesas recommends the RH850/F1L series instead of the UPD78F8041K8(R)-9B4-AX.