Method and apparatus for handling a charging state in a mobile electronic device
View Patent ↗Disclosed is a mobile device comprising a voltage supervisor and reset (VSAR) module configured to detect an input voltage, start a timer set to a predetermined time period responsive to detecting the input voltage, and output a low signal responsive to detecting the input voltage. The mobile device also comprises a battery charger module configured to receive the input voltage, receive the low signal, output a power signal, and charge a battery. The mobile device also comprises a processing module configured to receive the power signal, and attempt enumeration responsive to receiving the power signal, wherein the VSAR module is further configured to output a high signal to the battery charger module when the timer expires and enumeration has not been completed.
1. A mobile device comprising:
a voltage supervisor and reset (VSAR) module configured to detect an input voltage, start a timer set to a predetermined time period responsive to detecting the input voltage, and output a low signal responsive to detecting the input voltage;
a battery charger module configured to receive the input voltage, receive the low signal, output a power signal, and charge a battery;
a processing module configured to receive the power signal, and attempt enumeration responsive to receiving the power signal,
the VSAR module further configured to output a high signal to the battery charger module when the timer expires and enumeration has not been completed.
2. The mobile device of claim 1 , wherein the battery charging module is further configured to receive the high signal and cease charging the battery responsive to receiving the high signal.
3. The mobile device of claim 1 , wherein the predetermined time period is 100 ms.
4. The mobile device of claim 1 , wherein the input voltage is received from a USB host.
5. The mobile device of claim 4 wherein the enumeration is between the mobile device and the USB host.
6. The mobile device of claim 1 , wherein the VSAR module is further configured to delay outputting the high signal for a predetermined delay time.
7. The mobile device of claim 6 , wherein the predetermined delay time is 150 ms.
8. A method for charging comprising:
detecting an input voltage by a voltage supervisor and reset (VSAR) module
starting, by the VSAR module, a timer set to a predetermined time period responsive to detecting the input voltage
outputting, by the VSAR module, a low signal responsive to detecting the input voltage;
receiving the input voltage at a battery charger module;
receiving, by the battery charger module, the low signal;
outputting, by the battery charger module, a power signal
charging, battery charger module, a battery;
receiving the power signal at a processing module; and
attempting, by the processing module, enumeration responsive to receiving the power signal,
outputting, by the VSAR module, a high signal to the battery charger module when the timer expires and enumeration has not been completed.
9. The method of claim 8 , further comprising receiving, by the battery charging module, the high signal and ceasing charging the battery responsive to receiving the high signal.
10. The method of claim 8 , wherein the predetermined time period is 100 ms.
11. The method of claim 8 , wherein the input voltage is received from a USB host.
12. The method of claim 11 wherein the enumeration is between the mobile device and the USB host.
13. The method of claim 8 , further comprising delaying, by the VSAR module, outputting the high signal for a predetermined delay time.
14. The method of claim 13 , wherein the predetermined delay time is 150 ms.