Mobile device and operating method thereof
A mobile system includes a first mobile device configured to output a signal having a level less than or equal to a reference level on the basis of a charged state of a battery in the first mobile device and a second mobile device configured to receive the signal and to selectively provide power to the first mobile device on the basis of a duration time for which a level of the signal is maintained to be less than or equal to the reference level and a toggle time for which the signal is toggled.
1. A mobile system comprising:
a first mobile device configured to output a signal having a level less than or equal to a reference level on the basis of a charged state of a battery in the first mobile device; and
a second mobile device configured to receive the signal and to selectively provide power to the first mobile device on the basis of a duration time for which reception of the signal having the level less than or equal to the reference level is maintained and a toggle time for which the signal is toggled.
2. The mobile system of claim 1 , wherein;
if the duration time is longer than a first reference time, the second mobile device is configured to cut off power provided to the first mobile device; and
if the toggle time is longer than a second reference time, the second mobile device is configured to provide power to the first mobile device.
3. The mobile system of claim 2 , wherein the first mobile device comprises:
a protection circuit module configured to, when a charged voltage of the battery drops below a reference voltage, perform an over-discharge protection function; and
a first power management integrated circuit configured to output a toggled signal before the charged voltage of the battery increases to be greater than or equal to the reference voltage.
4. The mobile system of claim 3 , wherein the first reference time is longer than a time taken until the charged voltage reaches the reference voltage from a time at which charging of the battery starts.
5. The mobile system of claim 4 , wherein the first mobile device comprises a first power line communication (PLC) module configured to perform PLC-based communication with the second mobile device,
the second mobile device comprises a second PLC module configured to perform the PLC-based communication with the second mobile device, and
the first mobile device and the second mobile device are each configured to perform the PLC-based communication after the first reference time elapses.
6. The mobile system of claim 3 , wherein the second reference time is longer than a time for which the signal is toggled by an external impact.
7. The mobile system of claim 1 , wherein the second mobile device comprises:
a connection terminal electrically connected to the first mobile device;
a second power management integrated circuit configured to generate power to be provided to the first mobile device; and
a control circuit configured to control the second power management integrated circuit so that the power generated by the second power management integrated circuit is provided to the first mobile device based on the duration time and the toggle time.
8. The mobile system of claim 7 , wherein the control circuit comprises:
a low current sensor configured to first compare the duration time with a first reference time and to output a low current sense signal on the basis of a result of the first comparison;
a toggle sensor configured to second compare the toggle time with a second reference time and to output a toggle sense signal on the basis of a result of the second comparison; and
a power transmission controller configured to output a power transmission signal to the second power management integrated circuit so that the power is provided to the second mobile device based on the low current sense signal and the toggle sense signal.
9. The mobile system of claim 1 , wherein the reference level is a level obtained by multiplying a discharge rate of the battery by a threshold rate.
10. The mobile system of claim 1 , wherein the first mobile device comprises an earbud, and the second mobile device comprises an earbud charger.
11. A mobile device comprising:
a connection terminal configured to receive a signal from an external device including a battery;
a power management integrated circuit configured to generate power to be provided to the external device; and
a control circuit configured to control the power management integrated circuit so that the power is provided to the external device based on a duration time for which a level of the signal is maintained to be less than or equal to a reference level and a toggle time for which the signal is toggled.
12. The mobile device of claim 11 , wherein, if the duration time is longer than a first reference time, the control circuit is configured to cut off power provided to the external device, and
if the toggle time is longer than a second reference time,
the control circuit is configured to provide power to the external device.
13. The mobile device of claim 12 , wherein the control circuit comprises:
a low current sensor configured to first compare the duration time with a first reference time and to output a low current sense signal on the basis of a result of the first comparison;
a toggle sensor configured to second compare the toggle time with a second reference time and to output a toggle sense signal on the basis of a result of the second comparison; and
a power transmission controller configured to output a power transmission signal to the power management integrated circuit so that the power is provided to the external device based on the low current sense signal and the toggle sense signal.
14. The mobile device of claim 13 , wherein the first reference time is longer than a time taken until a voltage of the battery reaches a reference voltage, so that an over-discharge protection function performed on the battery to starts from a time at which charging of the battery starts.
15. The mobile device of claim 13 , wherein the second reference time is longer than a time for which the signal is toggled by an external impact.
16. An operating method of a mobile device capable of providing power to an external device including a battery, the operating method comprising:
receiving, from the external device, a signal having a level less than or equal to or a reference level; and
selectively providing power to the external device on the basis of a duration time for which reception of the signal having the level less than or equal to the reference level is maintained and a toggle time for which the signal is toggled.
17. The operating method of claim 16 , wherein the selectively providing power to the external device comprises:
comparing the duration time with a first reference time; and
cutting off the power provided to the external device on the basis of the signal of which the duration time is longer than the first reference time.
18. The operating method of claim 17 , wherein the first reference time is longer than a time taken until a charged voltage of the battery reaches a reference voltage, so that an over-discharge protection function performed on the battery starts from a time at which charging of the battery starts.
19. The operating method of claim 16 , wherein the selectively providing power to the external device comprises:
comparing the duration time with a second reference time; and
providing the power to the external device on the basis of the signal of which the toggle time is longer than the second reference time.
20. The operating method of claim 16 , wherein the reference level is a level obtained by multiplying a discharge rate of the battery by a threshold rate.