Patent ID: 7782240
Filing Date: 2010-08-24
Classification: H04L

Abstract:
1. A single-wire-interface target device comprising: a signal line capable of being coupled to a single-wire interface, the single-wire interface capable of providing electrical communication of both signals and power between a plurality of devices coupled to the single-wire interface; a device function having a signal port coupled to the signal line and having a power input port; a PMOS transistor coupled at a source to the signal line, the PMOS transistor also having a drain and a control gate; a charge storage device coupled to the drain of the PMOS transistor at a connection point and to the power input port of the device function at said connection point; and a control device having an input coupled to the signal line, a control output coupled to the gate of the PMOS transistor, and powered by the charge storage device at the connection point, such that the PMOS transistor is active to charge the storage device whenever the single-wire interface is at a power supply voltage level.