ASI4U/ASI4U-E is a new generation CMOS integrated circuit for ASI networks.
The low-level field bus AS-I (Actuator Sensor Interface) was designed for easy, safe and cost-effective interconnection of sensors, actuators and switches. It transports both power and data over the same two-wire unshielded cable.
ASI4U is used as a part of a master or slave node and works as an interface to the physical bus. The device realizes power supply, physical data transfer and communication protocol handling. ASI4U/ASI4U-E is fully compliant with ASI Complete Specification 3.0 and drop-in compatible with the A²SI/A²SI-E IC.
All configuration data are stored in an internal EEPROM that can be easily programmed by a stationary or handheld programming device. The special AS-I safety option assures short response times regarding security related events.

• Compliant with AS-Interface Complete Specification V3.0
• Universal application: in slaves, masters, repeaters and bus-monitors
• Drop-in compatible with A²SI
• Floating AS-I transmitter and receiver for high symmetrical high power applications
• On-chip electronic inductor with current drive capability of 55 mA
• Two configurable LED outputs to support all Spec. V3.0 status indication modes
• Several data preprocessing functions, including configurab- le data input filters and bit selective data inverting
• Additional addressing channel for easy wireless module setup
• Support of 8 / 16 MHz crystals by automatic frequency detection
• Special AS-I safety option
• Clock watchdog for high system security
• Available in SSOP28/5,3mm (ASI4U) or SOP28/300mil (ASI4U-E) package
• Industrial Temperature range -25°C to + 85°C (ASI4U)
• Extended Industrial Temperature range -25°C to + 105°C (ASI4U-E)

• Flexible, separated I/Os
• Flexible AS-I Bus adoption (isolated transceiver)
• Very small package SSOP 28 (ASI4U)
• Supports AS-I complete Specification 3.0
• Supports high ambient temperature applications (ASI4U-E)

the ASI4U / ASI4U-E is used in:

• Industrial / Factory automation