Flip cover wireless keyboard which utilizes wireless protocols for harvesting power and communicating with digital apparatus

A flip cover wireless keyboard for a digital apparatus comprising

• keyboard means for receiving user input data, processing data and for interfacing said digital apparatus,
• mechanical means for attaching to said digital apparatus,
• protection means for covering and safeguarding said digital apparatus,
• the keyboard means comprising user input means, data processor, wireless interface and wireless antenna,
• characterized in that
• said keyboard means utilizing a NFC protocol for setting up a connection with the digital apparatus, for harvesting power from the digital apparatus and for transmitting data to the digital apparatus in response to user-actuation,
• and said keyboard means receiving a request message from said digital apparatus used for powering and turning on the keyboard means, the data processor determining if at least one engage key being pressed at user input means, the data processor receiving data from user input means and processing and transmitting said data to the digital apparatus,
• wherein the keyboard means comprises means for modifying an impedance of the wireless antenna providing for being detected by the digital apparatus providing for receiving a request for devices message from the digital apparatus with sufficient power for start up of the data processor,
• wherein the means for modifying an impedance comprises an impedance modification network, and where the engage key is arranged for activating the impedance modification network,
• wherein the engage key is arranged for establishing a connection between the impedance modification network and the wireless antenna,
• wherein the impedance modification network comprises one or more of the following components:
• a capacitor, a resistor and an inductor, and where the impedance modification network is connected between the wireless antenna and a point at a defined potential by the engage key, and
• wherein the data processor has a power on/off signal input, and the engage key is arranged for establishing connection between the wireless antenna and the power on/off signal input via a rectification circuit, and where the rectification circuit is arranged for sending a signal to the power on/off signal input of the data processor, and the data processor comprises power input arranged for receiving power harvested from the digital apparatus for starting up and powering the data processor.