Slave-initiated communications over a single-wire bus

A method for supporting slave-initiated communications to a master circuit over a single-wire bus comprising:

• asserting a wakeup current mode signaling (CMS) on the single-wire bus to indicate a request to communicate a data telegram over the single-wire bus in response to a respective data trigger unknown to the master circuit;
• receiving a plurality of pulse-width modulation (PWM) symbols via the single-wire bus in response to asserting the wakeup CMS;
• determining whether the request is successful based on the plurality of received PWM symbols;
• and
• communicating the data telegram over the single-wire bus in response to determining that the request is successful.

A wireless device comprising a single-wire bus apparatus, the single-wire bus apparatus comprises:

• a master circuit coupled to a single-wire bus consisting of one wire;
• and
• a plurality of slave circuits each coupled to the single-wire bus and uniquely identified by a unique slave identification (USID) comprising multiple bits;
• wherein one or more slave circuits among the plurality of slave circuits are each configured to:
• assert a wakeup current mode signaling (CMS) on the single-wire bus to indicate a request to communicate a data telegram over the single-wire bus in response to a respective data trigger unknown to the master circuit;
• receive a plurality of pulse-width modulation (PWM) symbols via the single-wire bus in response to asserting the wakeup CMS;
• determine whether the request is successful based on the plurality of received PWM symbols;
• and
• communicate the data telegram over the single-wire bus in response to determining that the request is successful.