Communication devices and methods with power transfer over isolation for wake-up

A communication device, the communication device comprising:

• a first transceiver, the first transceiver including a first transmitter and a first receiver, the first transmitter configured to transmit first signals across a first galvanic isolator, the first receiver configured to receive second signals transmitted across a second galvanic isolator;
• a second transceiver, the second transceiver galvanically isolated from the first transceiver, the second transceiver including a second transmitter and a second receiver, the second transmitter configured to transmit the second signals across the second galvanic isolator, and the second receiver configured to receive the first signals transmitted across the first galvanic isolator;
• wherein the first transceiver further includes a variable power source, the variable power source configured to selectively provide power to the first transmitter to transmit power signals across the first galvanic isolator;
• and
• wherein the second transceiver further includes a wake-up device, the wake-up device configured to be powered by the power signals transferred across the third galvanic isolator, the wake-up device including a wake-up receiver coupled to the first galvanic isolator and configured to receive a wake-up signal across the first galvanic isolator.

A method of providing communication, the method comprising:

• transmitting a power signal from a first transceiver to a second transceiver across galvanic isolation, the first transceiver including a first transmitter and a first receiver, the second transceiver including a second transmitter, a second receiver and a wake-up device, and wherein the first transceiver is galvanically isolated from the second transceiver;
• powering the wake-up device with power derived from the power signal;
• transmitting a wake-up signal from the first transceiver to the wake-up device across a first galvanic isolator;
• and
• activating a system coupled to the second transceiver in response to the wake-up signal being received by the wake-up device, wherein the step of activating the system coupled to the second transceiver comprises demodulating the wake-up signal and detecting a pattern in the demodulated wake-up signal.