Patent ID: 7697957

Claim:
A mobile communication device comprising: a main processor for controlling operation of the mobile communication device; a smart battery coupled to the main processor for providing supply power to the mobile communication device, the smart battery comprising a battery processor for controlling the operation of the smart battery and communicating with the main processor, and a battery module having one or more batteries for providing the supply power; and a battery interface coupled between the main processor and the battery processor for providing communication therebetween, wherein the battery interface comprises a data communication line and protection circuitry comprising an RC network for protecting the main processor from electrostatic discharge; wherein the main processor comprises a transmit pin for transmitting data to the smart battery and a receive pin for receiving data from the smart battery, wherein the smart battery comprises an input/output pin, and wherein the RC network comprises a first resistor with a first node coupled to the transmit pin and a second node coupled to the receive pin, a second resistor with a third node coupled to the second node of the first resistor and a fourth node coupled to the input/output pin of the smart battery, and a capacitor coupled between the fourth node of the second resistor and ground, and wherein the data communication line is bi-directional and comprises the first resistor and the second resistor.