Renesas ASI4UE-G1-MT

Overview

ASI4UE-G1-MT from Integrated Device Technology is a master-mode AS-Interface (AS-i) universal IC compliant with AS-Interface Complete Specification V3.0, functioning as the physical layer interface and protocol handler in AS-i master nodes. It delivers 55 mA current drive via on-chip electronic inductor, supports 8/16 MHz crystal oscillators with automatic frequency detection, operates from –25 °C to +85 °C, and integrates EEPROM for configuration storage - enabling plug-in replacement in industrial automation master modules.

For engineers reviewing the ASI4UE-G1-MT datasheet, ASI4UE-G1-MT pinout, ASI4UE-G1-MT application, or ASI4UE-G1-MT equivalent, this device requires attention to master-mode operational configuration, IRD addressing channel setup, safety mode enablement constraints, and SSOP28 thermal derating above 70 °C.

Technical Context

The ASI4UE-G1-MT implements a Manchester-II encoded bidirectional AS-i bus transceiver with floating transmitter/receiver architecture optimized for symmetrical high-power two-wire bus operation. Its internal oscillator supports 8 MHz and 16 MHz crystals, and its clock watchdog ensures deterministic reset behavior during communication failures.

In master mode, the IC generates AS-i cycle timing, manages parameter/data port handshaking via PST and DSR signals, and routes IRD input for wireless module addressing. It processes up to 4 digital inputs and 4 digital outputs per slave address using extended address mode Profile 7.A.x.E, with configurable data inversion and input filtering disabled by default in safety-critical configurations.

Key Specifications

Pinout & Package

ASI4UE-G1-MT is housed in a RoHS-compliant SSOP28 package (5.6 mm × 13.6 mm, 0.635 mm pitch), rated for surface-mount reflow assembly and compatible with standard automated placement equipment.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar AS-i interface applications.

Compared with A²SI and SAP5, ASI4UE-G1-MT uniquely balances V3.0 compliance, master-mode readiness, and SSOP28 pin compatibility - making it optimal for upgrading existing master modules without layout changes while gaining IRD support and safety-mode determinism.

Availability

ASI4UE-G1-MT is available at Aetrix Electronics and suitable for industrial automation master modules, AS-i safety controllers, repeater nodes, and handheld configuration tools requiring stable component supply and long-term lifecycle assurance.

Supply support for ASI4UE-G1-MT 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, interface, and connectivity solutions for industrial, communications, and computing markets.

The ASI4U product line was designed specifically for AS-Interface V3.0-compliant industrial fieldbus nodes - targeting cost-sensitive, high-reliability automation systems requiring dual-role (master/slave) flexibility and safety certification support.

FAQ

What is the primary function of the ASI4UE-G1-MT in an AS-i network?

The ASI4UE-G1-MT serves as a master-mode AS-Interface physical layer interface and protocol handler. It generates AS-i cycle timing, drives the two-wire bus with 55 mA via its integrated electronic inductor, handles Manchester-II encoding/decoding, and manages parameter/data exchange with slaves. Its SSOP28 package and EEPROM-based configuration make it suitable for compact, field-upgradeable master modules in industrial automation systems.

Does the ASI4UE-G1-MT support both master and slave modes?

Yes, the ASI4UE-G1-MT is a universal AS-i IC capable of operating in master, slave, repeater, or bus-monitor mode - determined by EEPROM configuration and external pin states. The "-MT" suffix denotes master-optimized ordering, but the underlying silicon (ASI4U) supports all modes. Mode selection is implemented via PST-controlled parameter port writes and DSR timing sequences defined in the AS-Interface V3.0 specification.

How does the Safety Mode feature of the ASI4UE-G1-MT ensure compliance with AS-i safety standards?

The ASI4UE-G1-MT's Safety Mode disables data input filtering and synchronous I/O to guarantee ≤40 ms fault reaction time - matching the legacy A²SI IC's performance. This mode is activated via EEPROM configuration and requires external microcontroller firmware updates to use only permitted safety code sequences (e.g., 1110). When enabled, ASI4UE-G1-MT meets PL e / SIL 3 timing requirements for emergency stop and safety gate applications.

Can the ASI4UE-G1-MT replace the A²SI IC without hardware changes?

Yes, the ASI4UE-G1-MT is function- and pin-compatible with the A²SI IC in master mode and shares the same SSOP28 footprint. However, successful replacement requires EEPROM reprogramming to disable input filters and synchronous I/O if Safety Mode is used, and validation of thermal performance under sustained 55 mA bus drive. IDT explicitly prohibits A²SI-to-ASI4UE-G1-MT replacement in repaired safety modules per safety advisory Section 1.2.

What crystal frequencies does the ASI4UE-G1-MT support, and how is selection handled?

The ASI4UE-G1-MT supports 8 MHz and 16 MHz crystals, with automatic frequency detection performed at power-on reset. The oscillator circuit uses OSC1 and OSC2 pins and tolerates ±100 ppm accuracy. No external configuration is needed - the IC self-detects and configures internal timing dividers accordingly, enabling single-hardware-design support for both standard (167 kbit/s) and high-speed (500 kbit/s) AS-i variants.