| 摘要 |
An electronic device with a multifunctional universal serial bus (USB) port is provided. The electronic device includes a USB port, a processing unit, a power module, a master-slave response module, and a power control module. The master-slaver response module is connected between the USB port and the processing unit, and is used to produce a corresponding trigger signal to the processing unit according to a type of an external device connected to the USB port. The power control module is connected between the power module and a voltage pin of the USB port. Therein, the processing unit disables the power control module when receiving a first trigger signal. The processing unit enables the power control module to output the power to the power pin of the USB port when receiving a second trigger signal, thus to power the external device. |
| 主权项 |
1. An electronic device with a multifunctional universal serial bus (USB) port comprising:
a USB port configured to connect to an external device, wherein the USB port comprises a voltage pin, a device pin, and a ground pin; a processing unit comprising a device recognizing pin and a master-slave control pin; a master-slave response module connected between the device pin of the USB port and the master-slave control pin of the processing unit, and configured to produce a first trigger signal to the master-slave control pin of the processing unit when the USB port is connected to the external device which is a master device, and produces a second trigger signal to the master-slave control pin of the processing unit when the USB port is connected to the external device which is a slave device; a power module; a power control module comprising a voltage input port, a voltage output port, and an enable port, wherein the voltage input port is coupled to the power module, the voltage output port is coupled to the voltage pin of the USB port, the enable port is coupled to the master-slave control pin of the processing unit, the power control module is configured to convert a voltage input from the power module via the voltage input port and output the converted voltage to the voltage pin of the USB port via the voltage output port; a charge switch comprising a control terminal, a first path terminal, and a second path terminal, wherein, the control terminal is coupled to the voltage output port of the power control module, the first path terminal is coupled to the voltage pin of the USB port, and the charge switch is a low voltage activated switch; and a charge control module connected between the second path terminal of the charge switch and the power module, and configured to control to charge the power module; wherein, when the device recognizing pin of the processing unit receives the first trigger signal from the master-slave response module, the processing unit determines the USB port is connected to the master device, and controls the master-slave control pin to output a disable signal to the enable port of the power control module to disable the power control module, the charge switch is turned on accordingly, and the charge control module charges the power module according to a voltage received from the voltage pin of the USB port via the charge switch which is turned on; when the device recognizing pin of the processing unit receives the second trigger signal from master-slave response module, the processing unit determines the USB port is connected to the slave device, and controls the master-slave control pin output an enable signal to the enable port of the power control module to enable the power control module to output voltage to the voltage pin of the USB port, and the charge switch is turned off due to the control terminal receives the voltage from the voltage output port of the power control module. |
