Audio jack for a portable electronic device

1. A portable electronic device comprising:

a processor provided in a housing;

a jack provided in said housing, said jack being sized for receiving a plug of an audio accessory;

electrical connectors provided in said jack for enabling communication between said audio accessory and said processor and for contacting corresponding electrical connectors of said plug;

a switching circuit in communication with said processor and two of said electrical connectors, said switching circuit

after insertion of said plug into said jack, conducting a test on said electrical connectors to determine if a first one of said corresponding electrical connectors is electrically grounded; and

routing audio signals between a second one of said corresponding electrical connectors and said processor if said test indicates that said first one of said corresponding electrical connectors is electrically grounded.

2. A portable electronic device as claimed in claim 1 , wherein after insertion of said plug into said jack, said switching circuit further determines that said audio accessory is a microphone and does not route said audio signals to said processor when said first one of said corresponding electrical connectors and said second one of said corresponding electrical connectors are electrically grounded.

3. A portable electronic device as claimed in claim 1 , wherein said audio accessory is selected from a group comprising: stereo headsets, stereo headphones, mono headsets and mono headphones.

4. A portable electronic device as claimed in claim 1 , wherein said first one of said corresponding electrical connectors and said second one of said corresponding electrical connectors are located adjacent to one another at a base of said plug.

5. A portable electronic device as claimed in claim 1 , wherein said switching circuit includes a switch having a default position and a second position, said audio signals being routed between said first one of said corresponding electrical connectors and said processor when said switch is in said default position.

6. A portable electronic device as claimed in claim 5 , wherein said switch is changed from said default position to said second position based on an impedance test of said first one of said corresponding electrical connectors.

7. A portable electronic device as claimed in claim 1 , wherein said plug is one of a 2.5 mm plug and a 3.5 mm plug.

8. A portable electronic device as claimed in claim 1 , wherein after insertion of said plug into said jack, said switching circuit determines said audio accessory is a microphone, if said first one of said corresponding electrical connectors is not electrically grounded.

9. A method for connecting a plug of an audio accessory to a portable electronic device, said method comprising:

receiving a plug of said audio accessory in a jack of said portable electronic device, said jack having electrical connectors for enabling communication between said audio accessory and a processor of said portable electronic device, said electrical connectors each having a contact to corresponding electrical connectors of said plug;

conducting a test on said electrical connectors to determine if a first one of said corresponding electrical connectors is electrically grounded; and

routing audio signals between a second one of said corresponding electrical connectors of said plug and said processor if said first one of said corresponding electrical connectors of said plug is electrically grounded.

10. A method as claimed in claim 9 , wherein no audio signals are routed to said processor when both said first one of said corresponding electrical connectors and a second one of said corresponding electrical connectors are electrically grounded.

11. A method for connecting a plug of an audio accessory to a portable electronic device as claimed in claim 9 , wherein said audio accessory is selected from a group comprising: stereo headsets, stereo headphones, mono headsets and mono headphones.

12. A method for connecting a plug of an audio accessory to a portable electronic device as claimed in claim 9 , wherein said first one of said corresponding electrical connectors and said second one of said corresponding electrical connectors are located adjacent to one another at a base of said plug.

13. A method for connecting a plug of an audio accessory to a portable electronic device as claimed in claim 9 , wherein said audio signals are routed by a switching circuit.

14. A method for connecting a plug of an audio accessory to a portable electronic device as claimed in claim 12 , wherein said switching circuit includes a switch having a default position and a second position, said audio signals being routed between said first one of said corresponding electrical connectors of said plug and said processor when said switch is in said default position.

15. A method for connecting a plug of an audio accessory to a portable electronic device as claimed in claim 9 , further comprising performing an impedance test to determine if said first one of said corresponding electrical connectors in contact with said first one of said electrical connectors is electrically grounded.

16. A method for connecting a plug of an audio accessory to a portable electronic device as claimed in claim 14 , wherein said test is an impedance test.

17. A method for connecting a plug of an audio accessory to a portable electronic device as claimed in claim 15 , wherein said impedance test includes applying a voltage to a microphone bias connector, reading a voltage at a microphone detection connector and comparing the voltage reading to a predetermined threshold value.

18. A method for connecting a plug of an audio accessory to a portable electronic device as claimed in claim 9 , wherein said plug is one of a 2.5 mm plug and a 3.5 mm plug.

19. A method for connecting a plug of an audio accessory to a portable electronic device as claimed in claim 15 , wherein said impedance test is performed in response to said switching circuit detecting that said audio accessory is received in said jack.