Control chip and control system utilizing the same

1. A USB control chip for coupling to a first external chip via a first input/output pin and a second input/output pin, the USB control chip comprising:

a first interface module having a first pin and a second pin, wherein the first pin is electrically connected to the first input/output pin;

a second interface module having a third pin;

a first switching unit configured to: provide a first path between the second pin and the second input/output pin, provide a second path between the third pin and the second input/output pin, and turn on the first or the second path according to a first control signal;

a control unit configured to generate the first control signal, wherein when the first path is turned on, the first interface module controls the voltage levels of the first and second input/output pins, and when the second path is turned on, the second interface module controls the voltage level of the second input/output pin, wherein the first interface module is a power controller I/F logic circuit; and

a memory storing program code configured to determine a kind of chip that the first external chip is, and further configured to select a protocol for communicating with the first external chip based upon the kind of chip that it is determined to be;

wherein the second input/output pin is a common pin of the first interface and the second interface, where the first interface module has a different interface with the second interface module, and

wherein when the first external chip is a first kind of chip, the USB control chip is configured to utilize the first and second input/output pins to communicate with the first external chip such that the first external chip receives the voltage levels of the first and second input/output pins and provides power to an external device according to the voltage levels of the first and second input/output pins.

2. The USB control chip as claimed in claim 1 , further comprising:

a third input/output pin, wherein the first switching unit provides a third path between the third input/output pin and a fourth pin of the second interface module and turns on the third path according to the first control signal, and when the second and third paths are turned on, the second interface module controls the voltage levels of the second and third input/output pins according to an Inter-Integrated Circuit (I2C) protocol.

3. The USB control chip as claimed in claim 2 , wherein the first switching unit provides a fourth path between the third input/output pin and a fifth pin of the first interface module and turns on the fourth path according to the first control signal, and when the first and fourth paths are turned on, the first interface module controls the voltage levels of the first, second and third input/output pins.

4. The USB control chip as claimed in claim 1 , further comprising:

a third interface module comprising a fourth pin and a fifth pin, wherein the fourth pin is electrically connected to a third input/output pin; and

a second switching unit providing a third path between the fifth pin and a fourth input/output pin, providing a fourth path between a sixth pin of the second interface module and the fourth input/output pin, and turning on the third or the fourth path according to a second control signal generated from the control unit,

wherein when the third path is turned on, the third interface module controls the voltage levels of the third and fourth input/output pins, and when the fourth path is turned on, the second interface module controls the voltage level of the fourth input/output pin.

5. The USB control chip as claimed in claim 4 , wherein the control unit utilizes the first and second control signals to turn on the first and third paths and turn off the second and fourth paths.

6. The USB control chip as claimed in claim 4 , wherein the control unit utilizes the first and second control signals to turn on the second and fourth paths and turn off the first and third paths.

7. The USB control chip as claimed in claim 4 , wherein the control unit utilizes the first and second control signals to turn on the first and fourth paths and turn off the second and third paths.

8. The USB control chip as claimed in claim 4 , wherein the third and fourth input/output pins are coupled to a second external chip.

9. A USB control device coupled to an external device and comprising:

a connection port configured to couple to the external device;

a first external chip configured to communicate with the external device via the connection port; and

a control chip coupled to the first external chip via a first input/output pin and a second input/output pin and comprising:

a first interface module having a first pin and a second pin, wherein the first pin is electrically connected to the first input/output pin;

a second interface module having a third pin;

a first switching unit configured to: provide a first path between the second pin and the second input/output pin, provide a second path between the third pin and the second input/output pin, and turn on the first or the second path according to a first control signal;

a control unit configured to generate the first control signal, wherein when the first path is turned on, the first interface module controls the voltage levels of the first and second input/output pins, and when the second path is turned on, the second interface module controls the voltage level of the second input/output pin, wherein the first interface module is a power controller I/F logic circuit; and

a memory storing program code configured to determine a kind of chip that the first external chip is, and further configured to select a protocol for communicating with the first external chip based upon the kind of chip that it is determined to be;

wherein the second input/output pin is a common pin of the first interface and the second interface, where the first interface module has a different interface with the second interface module, and

wherein when the first external chip is a first kind of chip, the control chip is configured to utilize the first and second input/output pins to communicate with the first external chip such that the first external chip receives the voltage levels of the first and second input/output pins and provides power to the external device according to the voltage levels of the first and second input/output pins.

10. The USB control device as claimed in claim 9 , wherein the control chip is further coupled to the first external chip via a third input/output pin, the first switching unit provides a third path between the third input/output pin and a fourth pin of the second interface module and turns on the third path according to the first control signal, and when the second and third paths are turned on, the second interface module controls the voltage levels of the second and third input/output pins according to an Inter-Integrated Circuit (I2C) protocol.

11. The USB control device as claimed in claim 10 , wherein the first switching unit provides a fourth path between the third input/output pin and a fifth pin of the first interface module and turns on the fourth path according to the first control signal, and when the first and fourth paths are turned on, the first interface module controls the voltage levels of the first, second and third input/output pins.

12. The USB control device as claimed in claim 9 , wherein the control chip further comprises:

a third interface module comprising a fourth pin and a fifth pin, wherein the fourth pin is electrically connected to a third input/output pin; and

a second switching unit providing a third path between the fifth pin and a fourth input/output pin, providing a fourth path between a sixth pin of the second interface module and the fourth input/output pin, and turning on the third or the fourth path according to a second control signal generated from the control unit,

wherein when the third path is turned on, the third interface module controls the voltage levels of the third and fourth input/output pins, and when the fourth path is turned on, the second interface module controls the voltage level of the fourth input/output pin.

13. The USB control device as claimed in claim 12 , wherein the control unit utilizes the first and second control signals to turn on the first and third paths and turn off the second and fourth paths.

14. The USB control device as claimed in claim 12 , wherein the control unit utilizes the first and second control signals to turn on the second and fourth paths and turn off the first and third paths.

15. The USB control device as claimed in claim 12 , wherein the control unit utilizes the first and second control signals to turn on the first and fourth paths and turn off the second and third paths.

16. The USB control device as claimed in claim 12 , further comprising:

a second external chip coupled to the third and fourth input/output pins.

17. The USB control device as claimed in claim 9 , wherein the connection port is a USB 3.0 Type-C connector.

18. The USB control device as claimed in claim 9 , wherein the first external chip is a power switch or a power regulator.

19. The USB control device as claimed in claim 9 , wherein the control unit comprises a register storing program code, and the control unit executes the program code to generate the first control signal.

20. The USB control device as claimed in claim 9 , wherein the control unit is a hub controller.

21. The USB control chip as claimed in claim 1 , wherein the first interface module utilizes the first and second pins to communicate with the first external chip according to a first communication protocol, and the second interface module utilizes the third pin to communicate with the first external chip according to a second communication protocol.

22. The USB control chip as claimed in claim 1 , wherein the control unit is a hub controller.

23. The USB control chip as claimed in claim 1 , wherein the control unit generates the first control signal without depending on the signals on the first and second input/output pins.

24. The USB control device as claimed in claim 9 , wherein the first interface module utilizes the first and second pins to communicate with the first external chip according to a first communication protocol, and the second interface module utilizes the third pin to communicate with the first external chip according to a second communication protocol.

25. The USB control device as claimed in claim 9 , wherein the control unit generates the first control signal without depending on the signals on the first and second input/output pins.

26. The USB control chip as claimed in claim 1 , wherein when the first external chip is a first kind of chip, the USB control chip utilizes the first and second input/output pins to communicate with the first external chip simultaneously, and

wherein when the first external chip is a second kind of chip, the USB control chip utilizes the second input/output pin to communicate with the first external chip and the USB control chip does not utilize the first input/output pin to communicate with the first external chip.

27. The USB control chip as claimed in claim 1 , wherein when the first external chip is a second kind of chip, the USB control chip utilizes the second input/output pin to communicate with the first external chip such that the first external chip receives the voltage level of the second input/output pin and provides power to the external device according to the voltage level of the second input/output pin.