Electronic device and method of preventing erroneous recognizing inserting connector into earphone jack
An electronic device includes a circuit electrically connected to first and second contacts and a processor electrically connected to the circuit, wherein the circuit compares a first signal occurring by an electrical contact of the first contact and the external material with a first threshold value to generate a first comparison signal, compares a second signal occurring by an electrical contact of the second contact and the external material with a second threshold value to generate a second comparison signal, and generates a third signal based on a portion of the first and second comparison signals and provides the third signal to the processor, wherein the external material includes one of moisture and a foreign substance or the external connector, and the processor prevents recognizing a contact of the moisture or the foreign substance as a contact of the external connector based on a portion of the third signal.
1. An electronic device, comprising:
a housing;
an opening formed at one surface of the housing and a hole connected thereto;
a connector disposed within the hole and comprising a first contact and a second contact;
a circuit electrically connected to the first contact and the second contact; and
a processor electrically connected to the circuit,
wherein the circuit compares a first signal that has occurred by an electrical contact of the first contact and an external material with a first threshold value to generate a first comparison signal, compares a second signal that has occurred by an electrical contact of the second contact and the external material with a second threshold value to generate a second comparison signal, and generates a third signal based on at least a portion of the first comparison signal and the second comparison signal and provides the third signal to the processor,
wherein the external material comprises at least one of moisture, a foreign substance and an external connector, and
the processor is configured to prevent recognizing a contact of the moisture or the foreign substance as a contact of the external connector based on at least a portion of the third signal.
2. The electronic device of claim 1 , wherein the opening and the hole form an earphone jack receiver of the electronic device.
3. The electronic device of claim 1 , wherein the first contact electrically contacts with a left terminal of the external connector, and
the second contact electrically contacts with a ground (GND) terminal of the external connector, when the external connector contacts.
4. The electronic device of claim 3 , wherein the first contact maintains a pull-up state when the external material does not contact.
5. The electronic device of claim 4 , wherein the first contact has a predetermined range of floating voltage, when at least one of the moisture and the foreign substance contacts.
6. The electronic device of claim 4 , wherein the first contact has a ground level of voltage, when the external connector contacts.
7. The electronic device of claim 1 , wherein the circuit comprises:
a first comparator that compares a first signal from the first contact with a predetermined first threshold value to generate the first comparison signal; and
a second comparator that compares a second signal from the second contact with a predetermined second threshold value to generate the second comparison signal.
8. The electronic device of claim 7 , wherein the circuit further comprises a logical element that receives the first comparison signal generated in the first comparator and the second comparison signal generated in the second comparator and performs a logical OR calculation of the first comparison signal and the second comparison signal to generate the third signal.
9. The electronic device of claim 8 , wherein the processor is further configured to determine whether the external material is at least one of the moisture, the foreign substance and the external connector according to a logic state of the third signal output from the logical element.
10. The electronic device of claim 7 , wherein the first threshold value is set to a value higher than a floating voltage occurring as a result of the moisture or the foreign substance.
11. The electronic device of claim 7 , wherein the second threshold value is set to a value lower than a floating voltage occurring as a result of the moisture or the foreign substance.
12. The electronic device of claim 7 , wherein the first comparator generates a first comparison signal that defines a logic state high, when the first signal is higher than the first threshold value,
the second comparator generates a second comparison signal that defines a logic state low, when the second signal is lower than the second threshold value,
the logical element receives an input of the first comparison signal and the second comparison signal to generate a third signal that defines a logic state high, and
the processor executes instructions that determines whether the external material is at least one of the moisture and the foreign substance, when the third signal is in a logic state high.
13. The electronic device of claim 7 , wherein the first comparator generates a first comparison signal that defines a logic state low, when the first signal is lower than the first threshold value,
the second comparator generates a second comparison signal that defines a logic state low, when the second signal is lower than the second threshold value,
the logical element receives an input of the first comparison signal and the second comparison signal to generate a third signal that defines a logic state low, and
the processor executes instructions that determines whether the external material is the external connector, when the third signal is in a logic state low.
14. The electronic device of claim 1 , further comprising a memory that stores an operation table that determines a kind of the external material that contacts with the hole according to a logic state of the third signal input to the processor,
wherein the processor executes instructions that determines whether the external material is at least one of the moisture, the foreign substance and the external connector by referencing the operation table, when the third signal is input.
15. A method of preventing an electronic device from erroneously recognizing insertion of an external connector into a connector, the method comprising:
generating a first comparison signal by comparing a first signal that has occurred by an electrical contact of a first contact provided in the connector and an external material with a first threshold value;
generating a second comparison signal by comparing a second signal that has occurred by an electrical contact of a second contact provided in the connector and the external material with a second threshold value;
generating a third signal based on at least a portion of the first comparison signal and the second comparison signal; and
determining whether the external material is at least one of moisture, a foreign substance and the external connector based on the third signal.
16. The method of claim 15 , wherein the first threshold value is set to a value higher than a floating voltage occurring by the moisture or the foreign substance.
17. The method of claim 15 , wherein the second threshold value is set to a value lower than a floating voltage occurring by the moisture or the foreign substance.
18. The method of claim 15 , wherein generating a first comparison signal comprises generating a first comparison signal that defines a logic state high, when the first signal is higher than the first threshold value,
generating a second comparison signal comprises generating a second comparison signal that defines a logic state low, when the second signal is lower than the second threshold value,
generating a third signal comprises generating a third signal that receives an input of the first comparison signal and the second comparison signal to define a logic state high, and
determining whether the external material is at least one of the moisture, the foreign substance, and the external connector comprises determining that the external material is at least one of the moisture and the foreign substance, when the third signal is in a logic state high.
19. The method of claim 15 , wherein generating a first comparison signal comprises generating a first comparison signal that defines a logic state low, when the first signal is lower than the first threshold value,
generating a second comparison signal comprises generating a second comparison signal that defines a logic state low, when the second signal is lower than the second threshold value,
generating a third signal comprises generating a third signal that receives an input of the first comparison signal and the second comparison signal to define a logic state low, and
determining whether the external material is at least one of the moisture, the foreign substance, and the external connector comprises determining that the external material is the external connector, when the third signal is in a logic state low.
20. The method of claim 15 , wherein determining whether the external material is at least one of the moisture, the foreign substance, and the external connector comprises determining whether the external material is at least one of the moisture, the foreign substance, and the external connector by referencing an operation table stored in a memory.