A²SI is a monolithic CMOS integrated circuit certified for AS-i (Actuator Sensor-interface) networks. AS-i networks are intended for industrial automation. The main advantage of AS-i solutions is that actuators and sensors are connected using a two-wire unshielded cable that is easy to install. This cable transports both power and information/data. AS-i network communication is based on the master- slave principle. The network can be extended (to cable lengths greater than 100m) by using the A²SI in the repeater mode configuration. AS-i is a standard for the automation industry.
The A²SI is a monolithic CMOS integrated circuit certified for AS‑i (Actuator‑Sensor Interface) networks used in industrial automation. It complies with the AS‑i V2.11 specification and is supplied in a 28‑pin SSOP package.
The document describes the IC's functional blocks—including power supply, receiver, transmitter, digital logic, and protection circuitry—as well as pin assignments, operational modes (master/repeater and slave), and key specifications such as voltage outputs, integrated EEPROM, and watchdog functionality.
| AS‑i specification compliance | V2.11 |
|---|---|
| Integrated EEPROM | Yes |
| Additional addressing channel | Opto‑electronic interface |
| Extended address mode | Up to 62 slaves |
| AS‑i line input impedance | High impedance |
| Unregulated DC voltage output | ~24 V |
| Regulated DC voltage output | 5 V |
| LED status indicator | Yes |
| Integrated watchdog | Yes |
| Package type | 28‑pin SSOP |
| Maximum current from U5R pin | 4 mA |
It provides an unregulated ~24 V DC output and a regulated 5 V DC output.
Up to 62 slaves can be addressed when the extended address mode is enabled.
The IC is supplied in a 28‑pin SSOP package.
Yes, an integrated watchdog is part of the IC.