Accessory with a plug connector with a plurality of data contacts, an ID contact and an ID module

摘要

Disclosed is an accessory plug connector with at least a two data contacts and an ID contact. The data contacts are configured to enable communication between the accessory and host using a communication protocol and the ID contact carries information that identifies the protocol. The plug also has an ID module that holds the protocol information and sends the information over the ID contact. The ID module may also when it receives a request over the ID contact sends the ID information and configuration information about the data contacts over the ID contacts. The accessory may also have a power control module to enable a power path between the accessory and the host. The plug may have 180 degree symmetry, so that it can be inserted in two orientations. The ID module may switch the communication protocol to a different second protocol by sending a message over the ID contact, causing the data contacts to switch from being coupled to communication circuitry within the accessory for the first protocol to circuitry for the second protocol.