One-wire bidirectional bus signaling with manchester encoding

A data communication apparatus, comprising:

• a line driver configured to couple the data communication apparatus to a single-wire serial bus;
• and
• a protocol controller configured to:
• determine that a first sequence start condition (SSC) has been initiated when the single-wire serial bus has transitioned from a first signaling state to a second signaling state;
• cause the line driver to drive the single-wire serial bus from the second signaling state to the first signaling state after a first duration, thereby completing the first SSC;
• provide an arbitration window that comprises a plurality of timeslots by causing the line driver to present a high impedance to the single-wire serial bus after the first SSC is completed;
• cause the line driver to drive the single-wire serial bus to the first signaling state in each timeslot in the plurality of timeslots in which the single-wire serial bus is driven to the second signaling state;
• transmit a second SSC after the arbitration window is expired;
• and
• transmit a command addressed to at least one slave device after transmitting the second SSC, the command being encoded using Manchester encoding.

A method of data communication performed at a slave device, comprising:

• determining a duration of a first pulse on a single-wire serial bus;
• driving the single-wire serial bus from a first signaling state to a second signaling state through initiating a second pulse during a timeslot associated with the slave device in an arbitration window that follows the first pulse on the single-wire serial bus when the first pulse has a first duration that corresponds to a first type of sequence start condition (SSC);
• presenting a high impedance to the single-wire serial bus after initiating the second pulse;
• receiving a Manchester encoded command from a bus master device over the single-wire serial bus when the first pulse has a second duration that corresponds to a second type of SSC;
• and
• responding to the command when the command is addressed to the slave device.

A data communication apparatus, comprising:

• a line driver configured to couple the data communication apparatus to a single-wire serial bus;
• and
• a protocol controller configured to:
• determine a duration of a first pulse on the single-wire serial bus;
• drive the single-wire serial bus from a first signaling state to a second signaling state through initiating a second pulse during a timeslot associated with the data communication apparatus in an arbitration window that follows the first pulse on the single-wire serial bus when the first pulse has a first duration that corresponds to a first type of sequence start condition (SSC);
• present a high impedance to the single-wire serial bus after initiating the second pulse;
• receive a Manchester encoded command from a bus master device over the single-wire serial bus when the first pulse has a second duration that corresponds to a second type of SSC;
• and
• respond to the command when the command is addressed to the data communication apparatus.