TW201405319A - Portable electronic device and data transfer method thereof - Google Patents

Abstract

A portable electronic device and a data transfer method thereof are provided. A first USB physical layer circuit or a second USB physical layer circuit is controlled by a USB device control unit to transmit data through a pair of first differential signal leads and a pair of a second differential signal leads according to a result of an interface specification detection unit, wherein the first USB physical layer circuit is used for transmitting data adopting USB3.0 SSIC transmission specification.

Description

Portable electronic device and data transmission method thereof ELECTRONIC DEVICE AND DATA TRANSFER METHOD THEREOF

The present invention relates to a portable electronic device and a data transmission method thereof, and more particularly to a portable electronic device conforming to the USB3.0 SSIC transmission specification and a data transmission method thereof.

With the advancement of technology, a variety of external universal serial bus (USB) devices are booming in the market, not only facilitating people's lives, but also playing an indispensable role in life, such as smart A smartphone, a tablet PC, or an eBook. As mobile devices are moving toward "light and thin" and "high-performance, low-power" trends, the demand for small, fast, and power-saving memory cards has increased. At present, the memory card on the mobile device is dominated by the SD series. Although the USB 3.0 has a high speed and a variety of complete peripherals, the power consumption specification does not meet the requirements of low energy consumption of the mobile device because it does not optimize the power consumption of the mobile device. Therefore, it is currently unable to enter the mobile device market.

The invention provides a portable electronic device and a data transmission method thereof, which can make the portable electronic device meet the low energy consumption requirement of the mobile device and at the same time have high speed data transmission quality.

The invention provides a portable electronic device suitable for connecting to a host device and performing data transmission. The portable electronic device includes a first USB The body layer circuit, the second USB physical layer circuit, the first differential signal pin pair, the second differential signal pin pair, the USB device control unit, and the interface specification detecting unit. The first USB physical layer circuit is configured to transmit data conforming to the USB3.0 SSIC transmission specification, and the second USB physical layer circuit transmits data conforming to the USB3.0 transmission specification. The USB device control unit controls the first USB physical layer circuit or the second USB physical layer circuit to transmit data through the first differential signal pin pair and the second differential signal pin pair. The interface specification detecting unit is coupled to the first USB physical layer circuit, the second USB physical layer circuit and the host device, detects the transmission specification corresponding to the host device, and selects the USB physical layer for transmitting the data according to the transmission specification corresponding to the host device. Circuit.

The present invention also provides a data transmission method for a portable electronic device, which is suitable for data transmission with a host device. The portable electronic device includes a first USB physical layer circuit, a second USB physical layer circuit, and a third USB physical layer circuit. The first USB physical layer circuit is configured to transmit data conforming to the USB 3.0 SSIC transmission specification. The data transmission method includes the following steps. Detecting the power supply voltage to the portable electronic device. Determine if the power supply voltage is less than the preset voltage. If the power supply voltage is less than the preset voltage, the first USB physical layer circuit is selected to transmit data to and from the host device through a first differential signal pin pair and a second differential signal pin pair. If the power supply voltage is not less than the preset voltage, it is determined whether there is a signal transmission between the first differential signal pin pair and the second differential signal pin pair. If the first differential signal pin pair and the second differential signal pin have a signal transmission, the second USB physical layer circuit is selected to pass the first differential signal pin pair and the second differential signal pin pair and the host The device performs data transmission. If the first differential signal pin pair is opposite to the second differential signal pin Without signal transmission, the third USB physical layer circuit is selected to transmit data to and from the host device through the third differential signal pin pair.

Based on the above, the present invention provides a USB physical layer circuit and a differential signal pin pair for transmitting data conforming to the USB 3.0 SSIC transmission specification on the portable electronic device, so as to enable power consumption of the portable electronic device. Meet the requirements of mobile devices and meet the requirements for use inside mobile devices such as mobile phones. In addition, the interface specification detecting unit selects the USB physical layer circuit for transmitting data according to the power supply voltage, so that the portable electronic device conforms to the host device of different USB transmission specifications, thereby increasing the convenience of use of the portable electronic device.

The above described features and advantages of the present invention will be more apparent from the following description.

FIG. 1 is a schematic diagram of a portable electronic device according to an embodiment of the invention. Referring to FIG. 1 , the portable electronic device 100 can be used to connect to the host device 108 for data transmission with the host device 108 . The portable electronic device 100 includes a USB physical layer circuit 102, a USB device control unit 104, and an application module 106. The application module 106 can be used as a memory or an input/output interface, and the USB physical layer circuit 102 can be used for transmission. USB3.0 SSIC transmission specification information. The USB device control unit 104 is coupled to the USB physical layer circuit 102 and the application module 106. The USB device control unit 104 can control the USB physical layer circuit 102 to pass through the first differential signal pin pair Tx1, Tx2 and the second differential signal pin. Data transmission is performed on Rx1 and Rx2. Since the physical layer circuit 102 adopts the USB 3.0 high-speed communication protocol and the software mode and the MIPI (Mobile Industry Processor Interface) low-power physical layer technology, it has high transmission speed and low power consumption, and can be directly applied. On mobile devices (such as mobile phones, tablets, cameras, etc.), it also enhances the flexibility and breadth of the mobile device interface, allowing developers to eliminate the need to repeatedly develop all interfaces and peripheral devices, and greatly extend the applicable application processor system. The range of peripheral devices.

Further, the signal pin arrangement of the portable electronic device 100 can be as shown in FIG. 2A. The portable electronic device 100 includes a board body 202. The board body 202 is provided with a first differential signal pin pair Tx1 and Tx2. The second differential signal pin pair Rx1, Rx2, the power pin Vdd1 and the ground pin Vss1 form a pin row PR1, and the pin column PR1 is a data transmission/reception pin supporting the USB 3.0 SSIC transmission specification. Column. The first differential signal pin pair Tx1, Tx2 and the second differential signal pin pair Rx1, Rx2 are located between the power pin Vdd1 and the ground pin Vss1, and the USB device control unit 104 can control the USB physical layer circuit 102. Data is transmitted to the second differential signal pin pair Rx1, Rx2 and the host device 108 through the first differential signal pin pair Tx1, Tx2 and the second differential signal pin pair Rx1, Rx2. As described above, since the portable electronic device 100 has low power consumption characteristics, it can be applied to a mobile device, and all the pins are designed as a pad type as in the present embodiment. The portable electronic device 100 is used as an embedded memory card of the mobile device.

In detail, the configuration of the board body 202 can be, for example, a schematic cross-sectional view of the portable electronic device 100 illustrated in FIG. 2B or FIG. 2C. Referring to FIG. 2B, in the embodiment, the board 202 includes a printed circuit board 204 and a setting. Below the printed circuit board 204 is an IC component 206 corresponding to the pin location and a flash die 208. In addition, in some embodiments, the flash memory having a larger area may be selected, and the IC component 206 is disposed under the flash memory 208 (as shown in FIG. 2C).

It is to be noted that, since the board 202 of the above embodiment is provided with only one power pin Vdd1, the board 202 may include a plurality of circuits requiring different operating voltages, so a step-down circuit must be provided in the board 202 to The power supply voltage received by the power pin Vdd1 is stepped down to a plurality of different voltages. Limited to the configuration of the board 202, some commonly used step-down circuits may not be implemented on the board 202. 2D is a schematic diagram of signal pin settings of a portable electronic device according to another embodiment of the present invention. As shown in FIG. 2D, in the embodiment, the board body 202 further includes a power pin Vdd2 and a power pin Vdd3. The power pin Vdd2 and the power pin Vdd3 form a second pin string PR2 in the board 202. Therefore, the voltage of different voltage values can be directly received through the added power pin Vdd2 and the power pin Vdd3, without setting the step-down circuit in the board 202, thereby reducing the power consumption of the board 202 and reducing the plate body 202. The effect of the volume. It should be noted that in some embodiments, the power pin Vdd3 can also be designed as the ground pin Vss2 according to the actual application.

FIG. 3 is a schematic diagram of a portable electronic device according to another embodiment of the present invention. Referring to FIG. 3 , the portable electronic device 300 of the present embodiment further includes a USB physical layer circuit 302 , a USB physical layer circuit 304 , and an interface specification detecting unit 306 . The USB physical layer circuit 302 and the USB physical layer circuit 304 are coupled to the USB device control list. Between the element 104 and the interface specification detecting unit 306, the USB device control unit 104 can control the USB physical layer circuit 302 to transmit data conforming to the USB2.0 transmission specification, and can also control the USB physical layer circuit 304 to transmit data conforming to the USB 3.0 transmission specification. . The interface specification detecting unit 306 is further coupled to the host device 108. The interface specification detecting unit 306 is configured to detect a transmission specification corresponding to the host device 108 connected to the portable electronic device 300, and is configured according to the host device 108. The transmission specification selects the USB physical layer circuit that transmits the data. That is, the interface specification detecting unit 306 can select the USB physical layer circuit 102, 302 or 304 to perform data transmission according to the specification of the transmission port of the host device 108, and the data transmission is performed by the USB device control unit 104. In this embodiment, the USB physical layer circuit 102, 302 transmits data through the first differential signal pin pair Tx1, Tx2 and the second differential signal pin pair Rx1, Rx2, and the USB physical layer circuit 304 is Data transmission is performed on D+ and D- through the third differential signal pin.

Further, the interface specification detecting unit 306 may further include a switching unit 308 coupled to the USB physical layer circuit 102 and the USB physical layer circuit 304. The switching unit 308 can decide whether to select the USB physical layer circuit 102 for data transmission according to the power supply voltage supplied to the portable electronic device 300. The power supply voltage supplied to the portable electronic device 300 can be detected by the interface specification detecting unit 306.

In detail, the interface specification detecting unit 306 can determine whether the power supply voltage is less than a preset voltage (for example, 3V). If the power supply voltage is less than the preset voltage, that is, the data transmission specification of the host device 108 adopts the transmission specification of the USB3.0 SSIC, and the switching unit 308 selects the USB physical layer circuit 102 to transmit the difference. The signal pin pair Tx1, Tx2 and the second differential signal pin pair Rx1, Rx2 and the host device 108 perform data transmission. If the power supply voltage is not less than the preset voltage, the data transmission specification on behalf of the host device 108 may be USB 3.0 or USB 2.0. The interface specification detecting unit may first determine whether the first differential signal pin pair Tx1, Tx2 and the second differential signal pin pair Rx1, Rx2 have signal transmission, if the first differential signal pin pair Tx1, Tx2 and The second differential signal pin has signal transmission on Rx1 and Rx2. The data transmission specification of the host device 108 adopts the specification of USB 3.0, and the switching unit 308 selects the USB physical layer circuit 304 to transmit the first differential signal pair Tx1. Tx2 and the second differential signal pin pair Rx1, Rx2 and the host device 108 perform data transmission. If the first differential signal pin pair Tx1, Tx2 and the second differential signal pin pair Rx1, Rx2 have no signal transmission, the data transmission specification of the host device 108 adopts the USB 2.0 specification, and the switching unit 308 selects the USB physical layer. The circuit 306 transmits data to the host device 108 through the third differential signal pin pair D+/D-.

As described above, the interface specification detecting unit 306 selects the USB physical layer circuit for transmitting data according to the power supply voltage received by the portable electronic device 300, so that the transmission specification is compatible with the USB 3.0 SSIC. In addition, it is also compatible with the transmission specifications of USB 3.0 and USB 2.0, and provides a corresponding transmission mode for the host device 108 with different transmission specifications, which greatly improves the convenience of the portable electronic device 300.

Further, the signal pin arrangement of the portable electronic device 300 can be as shown in FIG. 4A, and the portable electronic device 400 includes a board 402. The structure of the board 402 can be, for example, as shown in FIG. 2B and FIG. 2C. No longer. board The body 402 is provided with a pin string PR1' and a pin string PR2, wherein the pin column PR1' is a data transmission/reception pin column supporting the USB3.0 and USB 3.0 SSIC transmission specifications, and the pin column PR2 is a support. The data transmission/reception pin column of the USB 2.0 transmission specification. The pin row PR1 ′ and the pin row PR2 are disposed on the plate body 402 parallel to the side edge S1 of the plate body 402 , and the pin row PR2 is closer to the side edge S1 than the pin row PR1 ′, and the side edge S1 is perpendicular to the port. The coupling direction of the electronic device 300 and the host device 108. The pin row PR1' includes a first differential signal pin pair Tx1, Tx2, a second differential signal pin pair Rx1, Rx2, and a ground pin Vss1, wherein the ground pin position Vss1 is located at the first differential signal pin. The pair of Tx1, Tx2 and the second differential signal pin are between Rx1 and Rx2. The pin string PR2 includes a third differential signal pin pair D+, D-, a power pin Vdd1, and a ground pin Vss2, wherein the third differential signal pin pair D+, D- is located at the power pin Vdd1 and the ground pin. Between Vss2.

The USB physical layer circuit 302 can transmit data to the host device 108 through the third differential signal pin pair D+, D-, and the USB physical layer circuit 102 and the USB physical layer circuit 304 can transmit the first differential signal pin to the Tx1. And Tx2 and data transmission to the second differential signal pin pair Rx1, Rx2 and the host device 108.

It should be noted that only one power pin Vdd1 is included in the portable electronic device 400, that is, the power pin Vdd1 is shared by USB 2.0, USB 3.0, and USB 3.0 SSIC. However, in some embodiments, another power pin may be added to separate the power pin used in the USB 3.0 SSIC transmission specification from the power pin used in USB 2.0 and USB 3.0. The portable electronic device 500 shown in FIG. 5A is on the pin than the portable electronic device 400. The column PR2 further includes a power pin Vdd2 for receiving the power supply voltage used by the USB 3.0 SSIC transmission specification, and the power pin Vdd1 for receiving. In configuration, the power pin Vdd2 can be located at the outermost position of the pin string PR2, as shown in FIG. 5A, which can be disposed on the left side of the power pin Vdd1 or on the right side of the ground pin Vss2 (such as a dotted line) Position shown).

In addition, the signal pin arrangement of the portable electronic device 300 can also be as shown in FIG. 6. The portable electronic device 600 includes a board body 602. The structure of the board body 602 can be, for example, as shown in FIG. 2B and FIG. 2C. Let me repeat. The board body 602 is provided with a pin row PR1", a pin column PR2 and a pin column PR3, wherein the pin column PR1" is a data transmission/reception pin column supporting the USB 3.0 SSIC transmission specification, and the pin column PR2 and the figure The 4A embodiment is the same as the data transmission/reception pin column supporting the USB 2.0 transmission specification, and the pin column PR3 is the data transmission/reception pin column supporting the USB 3.0 transmission specification. The pin row PR1", the pin row PR2, and the pin row PR3 are disposed on the board body 602 on the side edge S1 of the parallel plate body 602, and the pin row PR1", the pin row PR2, and the pin row PR3 are off-side. The distance from the edge S1 is the pin row PR1", the pin column PR3, and the pin column PR2, that is, the pin column PR2 is closest to the side edge S1, and the pin column PR1 is farthest from the side edge S1.

The pin string PR1" includes a first differential signal pin pair Tx1, Tx2, a second differential signal pin pair Rx1, Rx2, and ground pins Vss1, Vss3, wherein the ground pin positions Vss1, Vss3 are located first. The differential signal pin pair Tx1, Tx2 and the second differential signal pin pair Rx1, Rx2. The pin row PR2 includes a third differential signal pin pair D+, D-, a power pin Vdd1, and a ground pin. Vss2, where the third differential signal pin pair D+, D- are located between the power pin Vdd1 and the ground pin Vss2. The pin string PR3 includes a third differential signal pin pair Tx1', Tx2', a fourth differential signal pin pair Rx1', Rx2' and a ground pin Vss4, wherein the ground pin Vss4 is located at the third differential signal The pin pair Tx1', Tx2' and the fourth differential signal pin pair Rx1', Rx2'.

In this embodiment, the USB physical layer circuit 102 can transmit data to the second differential signal pin pair Rx1, Rx2 and the host device 108 through the first differential signal pin pair Tx1, Tx2, and the USB physical layer circuit 102. Data can be transmitted through the first differential signal pin pair Tx1, Tx2 and the second differential signal pin pair Rx1, Rx2 and the host device 108, and the USB physical layer circuit 302 can transmit the D+ through the third differential signal pin. D- and the host device 108 perform data transmission, and the USB physical layer circuit 304 can transmit data through the third differential signal pin pair Tx1', Tx2' and the fourth differential signal pin pair Rx1', Rx2'. It should be noted that, since the USB physical layer circuit 102 and the USB physical layer circuit 304 do not share the differential signal pin pair in this embodiment, the portable electronic device 600 does not need to be as shown in FIG. The switching unit 308 is configured to switch the USB physical layer circuit connected to the host device 108. Therefore, the portable electronic device 600 does not need to include the switching unit 308. The USB physical layer circuit 102 and the USB physical layer circuit 304 need not be coupled to the switching unit 308. Host device 108.

Similarly, since the portable electronic devices 400, 500, and 600 have the transmission interface of the USB 3.0 SSIC, that is, have low power consumption characteristics, and all of the pins are designed as a pad type, It can also be used as an embedded memory card for mobile devices. And compared to the portable electronic device 100, More compatible with USB 2.0 and USB 3.0 transmission interface, it is more flexible and convenient to use.

In addition, as shown in FIG. 4B and FIG. 5B, in the portable electronic device 400, the board body 202 may further include a third pin string PR3 including a power pin Vdd2 and a power pin Vdd3. In order to reduce the power consumption of the board 202 and reduce the volume of the board 202, the power pin Vdd3 can also be designed as the ground pin Vss3 according to the actual application. In the portable electronic device 500, the board body 202 may further include a third pin string PR3 including a power pin Vdd3 and a power pin Vdd4 to reduce the power consumption of the board 202 and reduce the volume of the board 202. The power pin Vdd4 can also be designed as a ground pin Vss3 according to the actual application.

FIG. 7 illustrates a data transmission method of a portable electronic device according to an embodiment of the invention. Referring to FIG. 7, the data transmission method of the portable electronic device may be summarized as follows. First, the power supply voltage supplied to the portable electronic device is detected (step S702). Next, it is determined whether the power supply voltage is less than a preset voltage (step S704), wherein the preset voltage may be, for example, 3V. When the power supply voltage is less than the preset voltage, the transmission interface of the host device conforms to the transmission specification of the USB 3.0 SSIC. If the power supply voltage is less than the preset voltage, the first USB physical layer circuit is selected to transmit data with the host device through a first differential signal pin pair and the second differential signal pin pair (step S706), wherein the first USB entity The layer circuit is used to transmit data conforming to the USB 3.0 SSIC transmission specifications. If the power supply voltage is not less than the preset voltage, it is determined whether there is signal transmission on the first differential signal pin pair and the second differential signal pin pair (step S708). If the first differential signal pin pair and the second differential signal pin are opposite each other In the signal transmission, the second USB physical layer circuit is selected to transmit data to and from the host device through the first differential signal pin pair and the second differential signal pin pair (step S710), wherein the second USB physical layer circuit can be used, for example. To transfer data that conforms to USB 3.0 transmission specifications. If there is no signal transmission between the first differential signal pin pair and the second differential signal pin pair, the third USB physical layer circuit is selected to perform data transmission with the host device through the third differential signal pin pair (step S712), The third USB physical layer circuit can be used, for example, to transmit data conforming to the USB 2.0 transmission specification.

In summary, the present invention provides a USB physical layer circuit and a differential signal pin pair for transmitting data conforming to the USB3.0 SSIC transmission specification on the portable electronic device to enable the portable electronic device. The power consumption meets the standards of mobile devices and meets the requirements of being able to be used inside mobile devices such as mobile phones. At the same time, the flexibility and extensiveness of the mobile device interface are improved, so that developers do not have to waste all development of all interfaces and peripheral devices. The range of application processor systems and peripheral devices. In addition, the USB physical layer circuit for transmitting data according to the power supply voltage is selected by the interface specification detecting unit, so that the portable electronic device can conform to the host device of different USB transmission specifications, and the convenience of use of the portable electronic device is increased.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100, 300, 400, 500, 600‧‧‧ portable electronic devices

102, 302, 304‧‧‧USB physical layer circuit

104‧‧‧USB device control unit

106‧‧‧Application Module

108‧‧‧Host device

202, 402, 602‧‧‧ board

204‧‧‧Printed circuit board

206‧‧‧IC components

208‧‧‧flash memory

308‧‧‧Switch unit

Tx1, Tx2‧‧‧ first differential signal pin pair

Rx1, Rx2‧‧‧ second differential signal pin pair

Vdd1~Vdd4‧‧‧Power pin

Vss1~Vss4‧‧‧ Grounding pin

PR1~PR3, PR1', PR1"‧‧‧ pin list

D+, D-‧‧‧ third differential signal pin pair

S1‧‧‧ side edge

Tx1', Tx2'‧‧‧ third differential signal pin pair

Rx1', Rx2'‧‧‧ fourth differential signal pin pair

S702~S712‧‧‧ Data transmission method steps

FIG. 1 is a schematic diagram of a portable electronic device according to an embodiment of the invention.

2A is a schematic diagram of signal pin settings of a portable electronic device according to an embodiment of the invention.

2B and 2C are schematic cross-sectional views of a portable electronic device according to an embodiment of the invention.

2D is a schematic diagram of signal pin settings of a portable electronic device according to another embodiment of the present invention.

FIG. 3 is a schematic diagram of a portable electronic device according to another embodiment of the present invention.

4A-6 are schematic diagrams showing signal pin settings of a portable electronic device according to an embodiment of the invention.

FIG. 7 illustrates a data transmission method of a portable electronic device according to an embodiment of the invention.

100‧‧‧Portable electronic devices

102‧‧‧USB physical layer circuit

104‧‧‧USB device control unit

106‧‧‧Application Module

108‧‧‧Host device

Tx1, Tx2‧‧‧ first differential signal pin pair

Rx1, Rx2‧‧‧ second differential signal pin pair

Claims (14)

A portable electronic device is adapted to be connected to a host device for data transmission. The portable electronic device includes: a first USB physical layer circuit for transmitting data conforming to the USB3.0 SSIC transmission specification; and a second a USB physical layer circuit for transmitting data conforming to the USB 3.0 transmission specification; a first differential signal pin pair; a second differential signal pin pair; a USB device control unit for controlling the first USB physical layer circuit or The second USB physical layer circuit transmits data to the second differential signal pin pair through the first differential signal pin pair; and an interface specification detecting unit coupled to the first USB physical layer circuit, the The second USB physical layer circuit and the host device detect the transmission specification corresponding to the host device, and select a USB physical layer circuit for transmitting data according to the transmission specification corresponding to the host device. The portable electronic device of claim 1, further comprising: a board; a first grounding pin, wherein the first differential signal pin pair and the second differential signal pin pair And the first grounding pin forms a first pin row, and the first grounding pin is located between the first differential signal pin pair and the second differential signal pin pair; and a second connection a row of feet, the first pin row and the second pin row are parallel to the board One side of the body is disposed on the board body, and the second pin row is closer to the side edge than the first pin row, and the second pin row includes: a third differential signal pin pair a first power pin; and a second ground pin, wherein the third differential pin pair is located between the first power pin and the second ground pin. The portable electronic device of claim 2, wherein the first pin is a data transmission/reception pin column supporting USB3.0 and USB 3.0 SSIC transmission specifications. The portable electronic device of claim 1, wherein the interface specification detecting unit further detects a power supply voltage of the portable electronic device, and the interface specification detecting unit comprises: a switching unit The first USB physical layer circuit, the second USB physical layer circuit and the host device are coupled to select a USB physical layer circuit for transmitting data according to the power supply voltage. The portable electronic device of claim 4, further comprising: a third USB physical layer circuit coupled to the host device for transmitting data conforming to the USB 2.0 transmission specification, the interface specification detecting unit further Determining whether the power supply voltage is less than a predetermined voltage. If the power supply voltage is less than the preset voltage, the switching unit selects the first USB physical layer circuit to connect to the second differential signal through the first differential signal pin pair. The foot pair performs data transmission with the host device. If the power supply voltage is not less than the preset voltage, the interface specification detecting unit determines whether there is a signal transmission between the first differential signal pin pair and the second differential signal pin, if the first differential signal The pin pair and the second differential signal pin have a signal transmission, and the switching unit selects the second USB physical layer circuit to pass the first differential signal pin pair and the second differential signal pin pair The host device performs data transmission. If the first differential signal pin pair and the second differential signal pin have no signal transmission, the switching unit selects the third USB physical layer circuit to transmit the third differential signal. The pin pair performs data transmission with the host device. The portable electronic device of claim 5, wherein the second pin is a data transmission/reception pin column supporting a USB 2.0 transmission specification, and the USB device control unit controls the third USB physical layer. The circuit transmits data through the third differential signal pin pair. The portable electronic device of claim 2, further comprising: a second power pin; and a third power pin forming a third pin row with the second power pin. The portable electronic device of claim 2, further comprising: a second power pin; and a third ground pin, and the second power pin forms a third pin row. The portable electronic device of claim 2, further comprising: a second power pin disposed in the second pin row and located at an outermost position of the second pin row, The first power pin is for receiving a power supply voltage used by the USB 2.0 and USB 3.0 transmission specifications, and the second power pin is for receiving a power supply voltage used by the USB 3.0 SSIC transmission specification. The portable electronic device of claim 9, further comprising: a third power pin; and a fourth power pin forming a third pin row with the third power pin. The portable electronic device of claim 9, further comprising: a third power pin; and a third ground pin, and the third power pin forms a third pin row. The portable electronic device of the second aspect of the invention, further comprising: a third grounding pin disposed in the first pin row, wherein the third grounding pin is located The first differential signal pin pair is disposed between the second differential signal pin pair; the third pin row is disposed on the board body, and is located at the first pin row and the second pin Between the columns, the third pin is supported by the USB 3.0 specification. a data transmission/reception pin column, the third pin column includes: a third differential signal pin pair; a fourth differential signal pin pair, the second USB physical layer circuit transmits the third difference The signal pin pair performs data transmission with the fourth differential signal pin pair; and a fourth ground pin, wherein the fourth ground pin is located at the third differential signal pin pair and the fourth differential The signal pin is between the pair. A data transmission method for a portable electronic device, configured to perform data transmission with a host device, the portable electronic device comprising a first USB physical layer circuit, a second USB physical layer circuit, and a third USB physical layer The circuit, wherein the first USB physical layer circuit is configured to transmit data conforming to a USB 3.0 SSIC transmission specification, the data transmission method includes: detecting a power supply voltage supplied to the portable electronic device; determining whether the power supply voltage is less than a pre-charge Setting a voltage; if the power voltage is less than the preset voltage, selecting the first USB physical layer circuit to transmit data to the host device through a first differential signal pin pair and a second differential signal pin pair; The power supply voltage is not less than the preset voltage, and it is determined whether there is a signal transmission between the first differential signal pin pair and the second differential signal pin; if the first differential signal pin pair and the second The signal is transmitted on the differential signal pin, and the second USB physical layer circuit is selected to transmit data to the host device through the first differential signal pin pair and the second differential signal pin pair; If the first differential signal pin connected to the second pair of differential signal pins There is no signal transmission, and the third USB physical layer circuit selects the data transmission with the host device through the third differential signal pin pair. The data transmission method of the portable electronic device of claim 13, wherein the second USB physical layer circuit is configured to transmit data conforming to the USB 3.0 transmission specification, and the third USB physical layer circuit is configured to transmit the data. USB 2.0 transmission specification information.