TWI394045B - Portable electronic device and method of identifying its accessories - Google Patents

Description

Portable electronic device and accessory identification method thereof

The invention relates to a portable electronic device and a method for identifying an accessory type for accessing the portable electronic device.

Portable electronic devices such as mobile phones often need to be connected to a variety of different accessories, such as earphones, chargers, and Universal Serial Bus (USB) lines. In order to connect these accessories, it is necessary to provide a corresponding interface on the portable electronic device. With the development of the functions of portable electronic devices, the types and quantities of interfaces they open have also increased.

In order to be portable and easy to use, most of the existing portable electronic devices tend to be miniaturized in size. However, the reduction in volume will result in a lack of sufficient space for the portable electronic device to open a variety of interfaces for connecting different accessories. Although the existing USB interface generally has the functions of data transmission and charging at the same time, it is still incompatible with a wider variety of accessories, such as Universal Asynchronous Receiver/Transmitter (UART), which cannot be effectively Reducing the number of interfaces on the portable electronic device is not conducive to reducing the size of the portable electronic device.

In view of the above, it is necessary to provide a portable electronic device that facilitates compatibility with a variety of accessories.

In addition, it is necessary to provide a portable electronic device accessory identification method with higher compatibility.

A portable electronic device includes an interface, a circuit board and an accessory detecting device. The accessory detecting device is electrically connected to the interface and the circuit board. The accessory detecting device comprises an interface compatible with a plurality of accessories and a USB detecting device. a circuit, a charge detecting circuit and a headphone detecting circuit, the interface includes a power pin, a high level pin, a low level pin and an identification pin, and the USB detecting circuit is connected to the high level lead a pin and the low level pin, the charge detecting circuit is connected to the power pin, the earphone detecting circuit is connected to the identity pin; the circuit board comprises a plurality of control access accessories and the portable electronic device working in cooperation a plurality of control circuits correspondingly connected to the USB detecting circuit, the charging detecting circuit and the earphone detecting circuit; when an accessory is connected to the interface, if the power pin is high level and the high level pin and The low-level pin has a signal output, and the portable electronic device determines that the accessory attached is a USB cable; if the power pin is high level and the high-level pin and the low-level lead If there is no signal output, the portable electronic device determines that the accessory to be accessed is a charger; if the power pin is low level and the identification pin has a signal output, the portable electronic device determines that the attached accessory is headset.

A portable electronic device accessory identification method, the method comprising the steps of: providing a portable electronic device, the portable electronic device comprising an interface for accessing an accessory, the interface comprising a power pin and a high level lead a pin, a low level pin and an identity pin; detecting a state of the power pin; detecting a high level pin and an output state of the low level pin when the power pin outputs a high level If the high level pin and the low level pin have a signal output, it is determined that the access accessory is a USB data line; if the high level pin and the low level pin have no signal output, then it is determined The access accessory is a charger; when the power pin outputs a low level, detecting an output state of the identity pin; if the identity pin has a signal output, determining that the access accessory is an earphone; if the identity is the identity If the identification pin has no signal output, it is determined that the access accessory is a Universal Asynchronous Receiver/Transmitter (UART).

Compared with the prior art, the portable electronic device provided by the present invention is compatible with only one interface. More common types of accessories, the corresponding portable electronic device accessory identification method can easily determine the type of access accessories, which is beneficial to reduce the size of the portable electronic device and simplify the structure of the portable electronic device.

(this invention)

1‧‧‧Portable electronic device

10‧‧‧ interface

100‧‧‧Accessory detection device

11‧‧‧USB detection circuit

12‧‧‧Charge detection circuit

13‧‧‧ headphone detection circuit

14‧‧‧ analog switch

200‧‧‧ boards

21‧‧‧USB control circuit

22‧‧‧Charging control circuit

23‧‧‧ headphone control circuit

24‧‧‧Universal Asynchronous Receiver Transmitter (UART) Control Circuit

25‧‧‧ codec circuit

26‧‧‧Audio amplification circuit

27‧‧‧Output selection circuit

VBUS‧‧‧ power pin

D+‧‧‧ high level pin

D-‧‧‧Low-level pin

ID‧‧‧identity pin

GND‧‧‧ Grounding Pin

IN1, IN2‧‧‧ input pins

OUT‧‧‧ output pin

SEL‧‧‧Select pin

1 is a block diagram of a preferred embodiment of a portable electronic device according to the present invention; and FIG. 2 is a flow chart of a preferred embodiment of a method for authenticating a portable electronic device according to the present invention.

Referring to FIG. 1 , a preferred embodiment of the portable electronic device of the present invention is a portable electronic device 1 . The portable electronic device 1 can be a mobile phone, a notebook computer, etc., and includes an interface 10 , an interface 10 , and the interface 10 . The electrical connection accessory detecting device 100 and a circuit board 200 electrically connected to the accessory detecting device 100.

The interface 10 is a Mini-USB interface having a power pin VBUS, a high level pin D+, a low level pin D-, an identity pin ID (Identity), and a ground pin GND. (Ground). The interface 10 can be used to access a variety of accessories, such as a USB cable, a charger, a Headset, a Universal Asynchronous Receiver/Transmitter (UART), and the like. According to the conventional structure of the Mini-USB interface, accessories such as a USB cable, a charger, and a UART can be directly inserted into the interface 10, and the UART is powered by an external power source; and accessories such as a headphone and an audio source connector can be connected through a USB earphone. A conventional means is connected to the interface 10.

The accessory detecting device 100 includes a USB detecting circuit 11, a charging detecting circuit 12, an earphone detecting circuit 13, and an analog switch 14. The USB detecting circuit 11 , the charging detecting circuit 12 , the earphone detecting circuit 13 and the analog switch 14 are electrically connected to the interface 10 . The USB detecting circuit 11, the charging detecting circuit 12, and the headphone detecting circuit 13 are used to detect and authenticate the attached accessory. The analog switch 14 has two sets of input pins IN1, IN2, a set of output pins OUT and a select pin. SEL. Each of the input pins IN1, IN2 and the output pin OUT includes two parallel pins.

The circuit board 200 is provided with a plurality of control circuits, such as a USB control circuit 21, a charging control circuit 22, an earphone control circuit 23, and a UART control circuit 24, for respectively controlling respective operations of different access accessories. The circuit board 200 further includes a Coder-Decoder (CODEC) 25 for processing voice signals, an audio amplification circuit 26, and an output selection circuit 27.

The plurality of control circuits are correspondingly connected to the plurality of detection circuits, so that the plurality of pins of the interface 10 are correspondingly connected through the plurality of detection circuits, and the specific connection method is as follows: the USB control circuit 21 detects the USB through the USB The circuit 11 is connected to the high-level pin D+ and the low-level pin D- of the interface 10. When the external USB cable is connected to the interface 10, the USB control circuit 21 can determine the USB detection circuit 11 The USB cable is connected to the interface 10, and the circuit board 200 and the USB cable of the access interface 10 are connected to each other through the high-level pin D+ and the low-level pin D-, thereby using the USB according to the conventional use. The data transmission mode of the interface controls the portable electronic device 1 to receive and output data through the high-level pin D+ and the low-level pin D- to perform data transmission. The charging control circuit 22 is connected to the power pin VBUS of the interface 10 through the charging detecting circuit 12. When the external charger is connected to the interface 10, the charging control circuit 22 can determine the charging through the charging detecting circuit 12. The device is connected to the interface 10, and the circuit board 200 and the charger of the access interface 10 are connected to each other through the power pin VBUS, thereby controlling the portable electronic device according to a conventional charging method using a USB interface. 1 Receive power from the charger through the power pin VBUS for charging operation. The earphone control circuit 23 accesses the identity pin ID of the interface 10 through the earphone detecting circuit 13. When a sound emitting device such as an external earphone is connected to the interface 10, the earphone device such as the earphone of the access interface 10 Also connected to the identity pin ID; the earphone control circuit 23 can determine, by the earphone detecting circuit 13, that the earphone and the like are connected to the interface 10, and thus the board can be identified by the identity pin ID The 200 is connected to a sound emitting device such as a headphone of the access interface 10 to transmit an audio signal according to a conventional terminal (D+, D-) of the USB interface. In a manner, the portable electronic device 1 is controlled to output an audio signal through a sound emitting device such as a headphone.

The UART control circuit 24 is simultaneously connected to the two pins of the input pin IN1 of the analog switch 14. The two pins of the output pin OUT are respectively connected to the high level pin D+ and the low level of the interface 10. Feet D-. In this manner, the UART control circuit 24 is connected to the high-level pin D+ and the low-level pin D- of the interface 10 through the analog switch 14, so that the circuit board 200 can be connected to the interface 10 through the interface 10. The UARTs are connected to each other to control the portable electronic device 1 to transmit data through the UART. The codec circuit 25 simultaneously accesses two pins of the input pin IN2 through the audio amplifying circuit 26, so that the portable electronic device 1 can transmit a voice signal through the interface 10. The output selection circuit 27 is coupled to the select pin SEL for strobing the UART control circuit 24 or the codec circuit 25 as needed. This ground pin GND provides a ground path.

When the portable electronic device 1 is used, a USB cable, an earphone, a charger, a UART, and the like can be electrically connected to the circuit board 200 through the interface 10 of the accessory detecting device 100, thereby respectively controlling the The portable electronic device 1 performs different tasks. When an accessory is connected to the interface 10, the portable electronic device 1 needs to detect the type of the accessory, and then performs corresponding work according to the detection result. Referring to FIG. 2, a preferred embodiment of the method for authenticating the accessory of the portable electronic device of the present invention is a method for detecting the type of the accessory attached to the accessory detecting device 100 of the portable electronic device 1, and the method includes the following steps. A portable electronic device 1 as described above is provided.

When an accessory is connected to the interface 10, the output state of the power supply pin VBUS is first detected by the charge detecting circuit 12.

If the output state of the power pin VBUS is high, it indicates that the accessory connected to the interface 10 has a charging effect on the portable electronic device. Since the USB cable connected to a computer or the like can charge the portable electronic device in addition to the ordinary charger, it can be further passed. The USB detection circuit 11 detects the output states of the high level pin D+ and the low level pin D-. When the high-level pin D+ and the low-level pin D- have a signal output, it can be determined that the accessory connected to the interface 10 is a USB cable connected to a device such as a computer. When the high level pin D+ and the low level pin D- no signal output, it indicates that the access accessory has a charging function but no USB signal output, so it is determined that the access accessory is a charger.

If the output state of the power pin VBUS is low, it indicates that the access accessory has no charging function, and the connection state of the identity pin ID is further detected by the earphone detecting circuit 23. If an accessory is connected to the identity pin ID, it can be determined that the access accessory is a headset. If no accessory accesses the identity pin ID, it can be determined that the access accessory is a UART.

When the detection is completed, the portable electronic device 1 can perform the corresponding function according to the type of the access accessory. When it is detected that the access accessory is a USB cable, the signal of the strobe codec circuit 25 and the audio amplifying circuit 26 is sent to the selection pin SEL of the analog switch 14 through the output selection circuit 27, so that the codec circuit 25 passes through the audio amplifying circuit 26. The access interface 10 transmits voice signals using the connected USB cable. In addition, other types of data transmission operations such as images can be directly performed by the USB control circuit 21 installed in the circuit board 200 in conjunction with the connected USB cable. In this way, the portable electronic device 1 can be used to perform a USB network telephone function or other data transmission function by using the same USB cable access interface 10. When it is detected that the attached accessory is a UART, the output selection circuit 27 can first input the signal of the strobe UART control circuit 24 to the selection pin SEL, and then use the UART to transmit and receive data. In this way, the portable electronic device 1 can be erroneously judged that the access accessory is a UART and the UART control circuit 24 is activated in vainly because the output signal of the relevant pin is not detected when the interface 10 is not connected to any accessory.

It can be understood that the above-mentioned earphone detecting circuit 13 can also be used for detecting accessories such as microphones and the like of other one-way transmission data.

In summary, the portable electronic device 1 provided by the present invention can be connected by only one interface 10 A different accessory, the corresponding portable electronic device accessory identification method can determine the type of access accessory from the output state of each pin of the interface 10, thereby reducing the number of interfaces on the portable electronic device, and effectively reducing The size of the portable electronic device is reduced, and the structure of the portable electronic device is simplified.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and those skilled in the art will be able to make equivalent modifications or variations in accordance with the spirit of the present invention. It should be covered by the following patent application.

1‧‧‧Portable electronic device

10‧‧‧ interface

100‧‧‧Accessory detection device

11‧‧‧USB detection circuit

12‧‧‧Charge detection circuit

13‧‧‧ headphone detection circuit

14‧‧‧ analog switch

200‧‧‧ boards

21‧‧‧USB control circuit

22‧‧‧Charging control circuit

23‧‧‧ headphone control circuit

24‧‧‧Universal Asynchronous Receiver Transmitter (UART) Control Circuit

25‧‧‧ codec circuit

26‧‧‧Audio amplification circuit

27‧‧‧Output selection circuit

VBUS‧‧‧ power pin

D+‧‧‧ high level pin

D-‧‧‧Low-level pin

ID‧‧‧identity pin

GND‧‧‧ Grounding Pin

IN1, IN2‧‧‧ input pins

OUT‧‧‧ output pin

SEL‧‧‧Select pin

Claims (7)

A portable electronic device includes: an interface, the interface includes a power pin, a high level pin, a low level pin and an identification pin; a circuit board, the circuit board includes a plurality of a control circuit for controlling the access accessory to cooperate with the portable electronic device; and an accessory detecting device electrically connected to the interface and the circuit board, the accessory detecting device comprising a USB detecting circuit and a charging detection a circuit and a headphone detecting circuit, the USB detecting circuit is connected to the high level pin and the low level pin, the charging detecting circuit is connected to the power pin, and the earphone detecting circuit is connected to the identity pin, the plurality of The control circuit correspondingly connects to the USB detecting circuit, the charging detecting circuit and the earphone detecting circuit; when an accessory is connected to the interface, if the power pin is high level and the high level pin and the low level lead If the foot has a signal output, the portable electronic device determines that the attached accessory is a USB cable; if the power supply pin is at a high level and the high level pin and the low level pin have no signal output, then Analyzing the access of Annex portable electronic device is a charger; if the power supply pin is low and the signal output pin identity, the access of the accessory is determined that the portable electronic device is a headset. The portable electronic device of claim 1, wherein the accessory detecting device further comprises an analog switch, wherein the plurality of control circuits of the circuit board comprise a universal asynchronous receiver/transmitter (Universal Asynchronous Receiver/Transmitter, a UART) control circuit, the UART control circuit is connected to the high level pin and the low level pin of the interface through the analog switch; if an accessory is connected to the interface, if the power pin is low If the identity pin has no signal output, the portable electronic device determines that the attached accessory is a UART. The portable electronic device of claim 2, wherein the analog switch comprises two groups. An input pin, a set of output pins and a select pin; the circuit board further includes a codec circuit and an output selection circuit, wherein the transceiver transmitter control circuit and the codec circuit respectively access a set of input pins The two pins of the output pin of the group are respectively connected to the high level pin of the interface and the low level pin, and the output selection circuit is connected to the selection pin; when the access accessory is judged as a USB line, the output selection circuit sends a strobe signal to the select pin to connect the codec circuit to the interface and the accessory; and when the accessed accessory is determined to be a UART, the output selection circuit directs the selection The pin sends a strobe signal to connect the UART control circuit to the interface and the accessory. The portable electronic device of claim 2, wherein the plurality of control circuits of the circuit board comprise a USB control circuit, and the USB control circuit is connected to the high level pin through the USB detecting circuit. This low level pin. The portable electronic device of claim 1, wherein the plurality of control circuits of the circuit board comprise a charging control circuit, and the charging control circuit is connected to the power supply pin through the charging detecting circuit. The portable electronic device of claim 1, wherein the plurality of control circuits of the circuit board comprise an earphone control circuit, and the earphone control circuit accesses the identity pin through the earphone detecting circuit. A portable electronic device accessory identification method includes the following steps: providing a portable electronic device, the portable electronic device comprising an interface for accessing an accessory, the interface comprising a power pin and a high level pin a low level pin and an identity pin; when an accessory is connected to the interface, detecting a state of the power pin; when the power pin outputs a high level, detecting the high level pin and the The output state of the low-level pin; if the high-level pin and the low-level pin have a signal output, it is determined that the access accessory is a USB data line; if the high-level pin and the low level If there is no signal output on the pin, then the connection is judged. The accessory is a charger; when the power pin outputs a low level, detecting an output state of the identity pin; if the identity pin has a signal output, determining that the access accessory is an earphone; if the identity is cited If there is no signal output, the access accessory is determined to be a Universal Asynchronous Receiver/Transmitter (UART).