AS1151

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AS1151 interface drivers, receivers, and transceivers are used in a variety of applications in the industrial, automotive, and consumer electronics fields.

An AS1151 interface is a two-wire half-duplex, 10Mbps, low pin count, low power asynchronous serial link, designed to connect two electronic devices (one master and one slave). It is particularly well suited for automotive and other noisy environments.

The master in an AS1151 system initiates all communications with the slave, thus requiring predictable, stable clock performance. At the heart of the AS1151 interface is an efficient synchronous data link, built around the controller area network (CAN) bus protocol.

The AS1151 protocol specifies that communication should start with the master sending a two byte preamble, which is set to "01". This tells the slave that a valid communication is starting, and must be present in each and every message. The Slave must then send a response, most commonly an "Acknowledgement" (ACK), followed by a one byte packet identifier (PID) indicating the type of data the master is requesting.

Once the PID is received, the Slave sends the requested data. The data sent is dependent on the PID given. For example, if the PID is 0x16, the slave would send back a 2 byte packet containing the wiper position. The master must then ACK the response and the communication is finished.

To provide robustness and noise immunity, there is an error checking mechanism in the packets sent between the master and slave. The error check type varies; depending on the type of data being sent. The most commonly used type is a simple XOR of the data bytes.

One of the most common uses for the AS1151 interface is in automotive applications. Motors, actuators, and sensors atop a car often need to send and receive data from a master computer. These devices cannot afford to be bulky, and the power requirements must be kept low. The current draw and physical size of AS1151 devices is ideal for these applications.

The AS1151 interface is also commonly seen in home automation systems. Remotely controlling air conditioners, lights, security systems, and other home appliances requires a reliable, low power interface. The AS1151 is perfect for these types of applications, and is quickly becoming the standard.

The AS1151 interface is also seeing increased use in industrial automation applications. Automated assembly lines, factory robots, and other industrial machinery need a reliable low-pin-count and low-power interface to communicate with their master controllers. AS1151 is perfect for these uses as it is easy to implement and meets the stringent requirements.

As with any interface, proper wiring and shielding is essential for a successful implementation of the AS1151. The wires to and from the interface must be properly shielded from nearby noise sources. Proper insulation must also be used to ensure a reliable and noise-free connection.

The AS1151 interface is an ideal solution for a variety of embedded applications. It is easy to implement, has low power requirements, and is extremely reliable. It is quickly becoming the standard for automotive, industrial, and home automation applications.

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