KR20160081676A - Travel adapter - Google Patents

Abstract

The present invention relates to a travel adapter for assisting the charging of a mobile terminal, wherein data communications can be conducted at the same time as charging. The travel adapter comprises: a male connector connected to a first terminal having USB on-the-go (OTG) applied thereto; a female connector connected to a second terminal by a USB and connected to the male connector so that the first and second terminals can exchange data with each other based on the USB OTG; a plug inserted into a plug receptacle to receive power provided from the outside; and a control part for, if the power provided from the outside is received to the plug, transmitting the power provided from the outside to the first and second terminals, and if the power provided from the outside is not received to the plug, transmitting the power provided from the first terminal to the second terminal.

Description

TRAVEL ADAPTER

The present invention relates to a travel adapter for assisting charging of a mobile terminal.

2. Description of the Related Art Recently, mobile terminals are constantly being released. Mobile terminals described herein include mobile phones, smart phones, laptop computers, digital broadcasting terminals, personal digital assistants (PDAs), portable multimedia players (PMPs) , Navigation, a slate PC, a tablet PC, an ultrabook, a wearable device (e.g., a smartwatch, a glass, a HMD head mounted display), digital cameras and MP3 players.

Furthermore, in recent years, many mobile terminals to which the USB OTG protocol has been applied are in the market. The USB OTG (On-The-Go) is a USB standard created in 1996 by seven companies including Intel, Compaq Computer, Microsoft, Northern Telecom, IBM, DEC and NEC. Cameras, printers, USB storage devices, MP3 players, etc.).

The mobile terminals to which the USB OTG protocol is applied are provided with a battery due to the characteristics of the mobile terminal and must supply external power to a charging circuit provided in the mobile terminal to charge the battery. At this time, a USB cable is used as one of methods for receiving power from the outside.

When a terminal operating as a host and a terminal operating as a slave are connected via a USB cable, the host must supply 5V power to the slave via a USB cable. The slave receives power from the host You must charge your battery. At this time, the host must supply power to the slave and shut off the charging path of the battery to prevent charging. For this purpose, a mobile terminal uses a GPIO (General Purpose Input Output) signal generated by a CPU to selectively change a charge path by dividing an operation mode by software.

A terminal operating as a host may be a smart phone, and a terminal operating as a slave may be various devices including a smart phone. In this case, since the power supply of the host is transmitted to the slave, the battery use time of the host is shortened and an additional power supply is required from the outside.

The present invention is directed to solving the above-mentioned problems and other problems. Another object of the present invention is to provide a travel adapter in which charging is performed for a plurality of mobile terminals to which the USB OTG protocol is applied and data exchange is possible between the plurality of terminals.

According to an aspect of the present invention, there is provided a travel adapter including: a male connector connected to a first terminal to which USB OTG (On-The-Go) is applied; A female connector connected to the male connector so that the first and second terminals exchange data based on the USB OTG (On-The-Go) A plug for receiving power supplied from the outside and a power supply for supplying power from the outside when the power supplied from the outside is received to the plug is transmitted to the first and second terminals, And a controller for transmitting power from the first terminal to the second terminal when the power is not received.

In one embodiment, the travel adapter is connected to a third terminal by USB, and the first and third terminals exchange data based on the USB OTG (On-The-Go) wherein the controller further comprises a sub female connector connected to a male connector, wherein when the power supplied from the outside to the plug is received, And transmits the power supplied from the first terminal to the second and third terminals when power supplied from the outside to the plug is not received.

In one embodiment, data is exchanged based on the USB OTG (On-The-Go) while the first and second terminals perform charging using power supplied from the outside. do.

In one embodiment, the apparatus further comprises a current amount control circuit for controlling an amount of current delivered to the at least one of the first terminal and the second terminal based on a current demand of at least one of the first terminal and the second terminal.

The current amount control circuit may include a first current amount control circuit for controlling an amount of current delivered to the first terminal based on a current demanded amount of the first terminal, And a second current amount control circuit for controlling an amount of current delivered to the second terminal.

In one embodiment, the control unit changes the size of a resistor connected to the ID pin provided on the male connector, based on whether power supplied from the outside is received in the plug .

In one embodiment, the first terminal is configured to determine a charge or a discharge based on a magnitude of a resistance connected to the ID pin.

The effect of the travel adapter according to the present invention will be described as follows.

The conventional travel adapter merely performs the function of charging, but the travel adapter according to the present invention is capable of data communication at the same time as charging. That is, while a plurality of terminals connected to the travel adapter perform charging using power supplied from the outside, the plurality of terminals can exchange data based on USB OTG (On-The-Go). Since a plurality of terminals are charged and data is exchanged by one travel adapter, a new effect that portability is easy and user convenience is increased occurs.

1 is a conceptual diagram illustrating a travel adapter according to an embodiment of the present invention;
2 is a block diagram for explaining a travel adapter according to the present invention;
FIG. 3 is a conceptual diagram for explaining the travel adapter described in FIG.
4A, 4B and 4C are conceptual diagrams for explaining the operation of the mobile terminal by the travel adapter of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

1 is a conceptual diagram illustrating a travel adapter according to an embodiment of the present invention.

 Referring to FIG. 1, at least one mobile terminal may be connected to the travel adapter 100 according to the present invention to perform charging. The travel adapter includes a male connector inserted into the terminal of the movable terminal, a female connector into which the USB is inserted, and a plug inserted into the socket. Although not shown in the drawings, the male connector may be connected to the USB cable and detachably attached to the travel adapter.

Meanwhile, the mobile terminal described in the present invention includes a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation device, a slate PC PCs), tablet PCs, ultrabooks, wearable devices (e.g., smartwatches, smart glass, HMDs (head mounted displays)), digital A camera and an MP3 player.

The mobile terminal has a power supply unit. The power supply unit receives external power and internal power, and supplies power to each component included in the mobile terminal. Such a power supply unit includes a battery, which may be an internal battery or a replaceable battery.

Meanwhile, universal serial bus on-the-go (OTG) is applied to the mobile terminal described in the present invention.

USB OTG refers to a modified universal serial bus (USB) standard that allows a USB device to be connected to a mobile terminal. According to the USB OTG, point-to-point communication between the mobile terminal and the USB device is possible without computer intervention. Cables and connectors using USB OTG have a total of 5 pins with an additional ID pin to select the host or slave.

According to the USB OTG, the mobile terminal has a USB interface. The USB interface unit is connected to another mobile terminal through a USB cable, and supplies power to the other mobile terminal or exchanges data with the other mobile terminal according to an operation mode. The USB jack with USB OTG protocol consists of 5 pins (Vcc, D +, D-, ID, GND).

The pin 1 (Vcc or Vbus) supplies + 5V power to the external device through the USB cable when operating in the host mode. When operating in the slave mode, the external pin is supplied with + 5V power. Pin 2 (D +) and pin 3 (D-) are the input / output terminals for data signals for data exchange. The fourth pin (ID) is a terminal for implementing the OTG function, and the operation mode (host or slave) of the mobile terminal is determined according to the pin state (high or low). Pin 5 (GND) is the terminal that outputs the ground signal.

At least one mobile terminal can be connected to the travel adapter according to the present invention to perform charging, and a plurality of terminals connected to the travel adapter can exchange data based on USB OTG while performing charging. The detailed structure of the travel adapter formed to perform such a function will be described later in detail with reference to the drawings.

2 is a block diagram illustrating a travel adapter according to the present invention.

Referring to FIG. 2, the travel adapter 100 according to the present invention includes a male connector 110, a female connector 120, at least one sub female connector 122, plug 130, a control unit 140, and a current amount control circuit 150.

The male connector 110 is adapted to be inserted into a mobile terminal to which USB OTG (On-The-Go) is applied.

A female connector (120) is connected to the mobile terminal by a USB cable. The first terminal is connected to the male connector 110 and the first and second terminals exchange data based on the USB OTG when the second terminal is connected to the female connector 120, And the female connector 120 are electrically connected to each other.

At least one femail connector 130 is connected to the mobile terminal by a USB cable. When the first terminal is connected to the male connector 110 and the third terminal is connected to the sub-female connector 130, the first and third terminals mutually exchange data based on the USB OTG, 110 and the sub-arm connector 130 are electrically connected to each other.

The female connector 120 and the sub-female connector 130 are for discriminating the female connectors, and are not limited to the term. The female connector 120 may be referred to as a first female connector, and the sub-female connector 130 may be referred to as a second female connector. That is, the travel adapter according to the present invention includes one or more female connectors.

The plug 130 is made to receive power supplied from the outside by being inserted into the outlet.

The controller 140 may sense whether the power supplied from the outside is received by the plug 130 when the first terminal is connected to the male connector 110 and the second terminal is connected to the female connector 120. [ According to the detection result, the power supplied from the outside is transmitted to the first and second terminals or the power supplied from the first terminal is transmitted to the second terminal. Specifically, when power supplied from the outside is received in the plug 130, power supplied from the outside is transmitted to the first and second terminals. When power supplied from the outside to the plug is not received, And delivers the supplied power to the second terminal.

Meanwhile, a third terminal as well as the first and second terminals may be connected to the sub-arm connector 130. In this case, when the power supplied from the outside is received in the plug 130, the controller 140 transmits power supplied from the outside to the first to third terminals, and when power supplied from the outside to the plug is not received And transmits the power supplied from the first terminal to the second and third terminals.

In other words, when the plug 130 is inserted into the outlet and power supplied from the outside is received, all the mobile terminals connected to the travel adapter 100 are controlled to be charged by the power supplied from the outside.

Alternatively, in a state where the plug 130 is not inserted into the receptacle, power is supplied from a host (for example, a first terminal) to terminals other than the host (for example, ).

The host and at least one slave can exchange mutual data based on the USB OTG. Specifically, the travel adapter is configured to exchange data based on the USB OTG while the first and second terminals perform charging using the power supplied from the outside. In addition, the travel adapter is configured to exchange data based on the USB OTG while the second terminal performs charging using the power supplied from the first terminal.

Meanwhile, the control unit 140 may control the power supplied from the first terminal and the power supplied from the outside to prevent collision. More specifically, the magnitude of the resistance connected to the fourth pin (ID) provided on the male connector 110 can be changed based on whether a power source supplied from the outside is received by the plug 130. [ For example, when power is received at the plug 130, a fourth pin (ID) is connected to the other end of the resistor connected to the ground (GND) at one end. When power is not received at the plug 130, (ID) to ground (GND).

The mobile terminal determines charging or discharging based on the magnitude of the resistance connected to the fourth pin (ID). For example, when the resistance of the fourth pin (ID) connected to the first mobile terminal is infinite, the host performs discharging to supply power to the slave. Alternatively, when the resistance of the fourth pin (ID) connected to the first mobile terminal is a predetermined size, charging is performed using a power source supplied from the outside.

For example, when power is received at the plug 130 of the travel adapter 100 while the first and second terminals are connected to the travel adapter 100, the fourth pin (ID) It is connected to a preset resistor. Thus, the first and second terminals can perform charging by a power source supplied from the outside. On the other hand, when the plug 130 is pulled out of the outlet, the plug 130 is not powered. At this time, the fourth pin (ID) is connected to the ground (GND) instead of the predetermined resistor, and the first terminal switches the operation from charge to discharge to supply power to the second terminal. The travel adapter transmits power received from the first terminal to the second terminal.

The second pin D + and the third pin D- of the first terminal are connected to the second pin of the second terminal by the travel adapter 100 regardless of whether the resistance connected to the fourth pin ID is changed D +) and the third pin (D-), data exchange can be continuously performed. That is, when power is received in the plug, the second pin (D +) and the third pin (D-) are opened by an external power source, and when power is not received in the plug, The second pin (D +) and the third pin (D-) are opened by the power source, so that power is supplied to the travel adapter so that the first and second terminals can exchange data with each other.

Although not shown in the figure, the controller 140 may further include at least one of a charging adapter and a charging circuit for charging the mobile terminal.

BACKGROUND ART [0002] In recent years, a fast charging of a mobile terminal has been demanded, so that a charging circuit is provided to enable a mobile terminal to be charged at a high speed. The current amount control circuit 150 adjusts the amount of current to be transmitted to the mobile terminal based on the current demanded amount of the mobile terminal connected to the travel adapter 100. [

There are SDP (standard downstream port) and CDP (charging down streamer) schemes for performing charging while performing data communication. According to the SDP method, 500 mA charging is performed while data communication is performed. According to the CDP method, 1.5 A charging is performed while performing data communication. The travel adapter according to the present invention can support both the SDP scheme and the CDP scheme.

When the first and second terminals are connected to the travel adapter 100, when the power is received in the plug 130, the current control circuit 150 supplies power to the first and second terminals in a CDP manner, When power is not received in the plug 130, the current amount control circuit 150 may supply power to the second terminal in the SDP manner. Since the charging is performed based on the accurate amount of current required for the mobile terminal, resources are prevented from being unnecessarily wasted, and fast charging can be performed.

If at least one of the first and second terminals does not support the CDP scheme, even if the power is received in the plug 130, the current control circuit 150 may control the at least one The amount of current to be transmitted can be adjusted. More specifically, the current control circuit 150 includes a first current amount control circuit for controlling the amount of current delivered to the first terminal based on the current demand of the first terminal, and a second current amount control circuit And a second current amount regulating circuit for regulating an amount of current to be transmitted to the second transistor.

Hereinafter, the travel adapter 100 according to the present invention will be specifically described with reference to the circuits of the control unit 140 and the current amount control circuit 150. [

3 is a conceptual diagram for explaining the travel adapter described with reference to Fig. 2 in more detail.

3, the travel adapter 100 according to the present invention includes a male connector 110, a female connector 120, a plug 130, a controller 140, and a current control circuit 150.

The current amount control circuit 150 includes a first current amount control circuit 152 and a second current amount control circuit 154. The control unit 140 includes a first switching unit 142, a second switching unit 144, 3 switching unit 146. [

The current amount control circuit 150 is disposed between the first pin Vcc of the male connector 110 and the first pin Vcc of the female connector 120, The connector 120 is connected.

The first current control circuit 152 includes a first diode, and power is transmitted from the plug to the male connector 110 only. The second current-amount control circuit 154 includes a second diode, and power is transmitted from the plug to the arm connector 120 only.

The first current amount control circuit 152 controls the amount of current delivered to the first terminal based on the current demand amount of the first terminal and the second current amount control circuit 154 adjusts the amount of current to be transmitted to the second terminal based on the current demand amount of the second terminal. The amount of electric current to be transmitted to the light source is adjusted.

The first switching unit 142 senses whether or not power is received at the plug 130, and is turned on / off according to the detection result. Specifically, when the plug 130 receives power, the first switching unit 142 turns on the power supplied to the internal circuit. On the other hand, when power is not received in the plug 130, the plug 130 is turned off to disconnect the internal circuit and the plug.

The second switching unit 144 is configured to connect the first pin Vcc provided in the male connector 110 to the cathode of the first diode or the anode of the second diode.

When the first switching unit 142 is turned on, the second switching unit 144 connects the first pin Vcc of the male connector 110 to the cathode of the first diode. As a result, the first terminal connected to the male connector 110 can perform charging using the power received by the plug, and the power supplied from the first mobile terminal by the first diode collides with the power received by the plug Is prevented.

When the first switching unit 142 is turned off, the second switching unit 144 connects the first pin Vcc of the male connector 110 to the anode of the second diode. Power is supplied from the male connector 110 to the female connector 120 because the first switching unit 142 is turned off and the connection between the internal circuit and the plug is broken.

The third switching unit 146 changes the magnitude of the resistance connected to the fourth pin (ID) of the male connector 110 based on the ON / OFF state of the first switching unit 142. Specifically, when power is received in the plug 130 (when the first switching unit is turned on), the fourth pin (ID) of the male connector 110 is connected to the other end of the resistor whose one end is connected to the ground (GND) (ID) to ground (GND) when power is not received in the plug 130 (when the first switching unit is turned off).

The mobile terminal connected to the male connector 110 may supply power to the first pin Vcc provided in the male connector 110 based on the resistance magnitude of the fourth pin ID provided in the male connector 110 Whether or not to supply it. For example, when the resistance of pin 4 (ID) is infinite, power is supplied to pin 1 (Vcc), and when the resistance of pin 4 (ID) And can perform charging using the power source transmitted from the travel adapter 100.

Although not shown in the drawing, the first to third switching units 142-146 and the first and second current control circuits 152 and 154 are electrically connected to each other to operate organically.

Meanwhile, when the mobile terminal is connected to the travel adapter according to the present invention, the mobile terminal determines charging or discharging based on the magnitude of the resistance connected to pin No. 4 of the travel adapter. Hereinafter, the operation of the mobile terminal connected to the travel adapter will be described in detail.

4A, 4B and 4C are conceptual diagrams for explaining the operation of the mobile terminal by the travel adapter of the present invention.

Referring to FIG. 4A, the first through third terminals 200-220 may be connected to the travel adapter 100 according to the present invention. At this time, the first terminal 200 is connected to a male connector to serve as a host terminal, and the second and third terminals 210 and 220 are connected to a female connector to function as a slave terminal. Can be performed. For example, the first terminal 200 can access a memory provided in at least one of the second and third terminals 210 and 220 to copy or delete files. In addition, the first terminal 200 may supply power to the second and third terminals 210 and 220. [ The second and third terminals 210 and 220 can perform charging using the power of the first terminal 200 transmitted through the travel adapter 100. [

The first terminal 200 receives information related to the travel adapter 100 using the information received at the fourth pin of the travel adapter 100 and transmits the received information to the first terminal 200, On the display portion of the display device. More specifically, whether or not power is supplied from the outside, the name of another terminal connected to the travel adapter, the manner in which the other terminal performs charging, whether OTG data communication is possible with the other terminal, whether OTG data communication is permitted, And can be displayed on the display unit of the host terminal.

For example, as shown in FIG. 4A, when power is not received in the plug of the travel adapter 100, the first terminal 200 may be charged based on the resistance magnitude of the fourth pin (ID) Can be determined. Then, the first terminal 200 can supply power to the first pin (Vcc), and guide the first terminal 200 using at least one of visual, tactile, and auditory.

The first terminal 200 receives the terminal identification information of each of the second and third terminals 210 and 220 using the fourth pin and transmits the name of another terminal connected to the travel adapter using the received identification information Can be displayed on the display unit. Information of terminals connected by the travel adapter 100 can be displayed in a list format.

At this time, the first terminal 200 can display on the display unit how the data communication by the travel adapter is performed (for example, SDP or CDP).

4B, when power is supplied to the plug of the travel adapter 100, the first terminal 200 switches from the discharging state to the charging state based on the resistance magnitude of the fourth pin (ID) Can be detected. When the discharging state is switched to the charging state, the first terminal 200 stops supplying power to the first pin (Vcc) and performs charging using the power supplied to the first pin (Vcc) . Then, it is possible to guide the charging state using at least one of visual, tactile, and auditory.

The travel adapter 100 can adjust the amount of electric power supplied to the terminals connected to the travel adapter 100 by using the current amount control circuit as the power is received by the plug. More specifically, the amount of current supplied to the first terminal is controlled using the first current amount control circuit 152, and the amount of current supplied to the second terminal is adjusted using the second current amount control circuit 154 . At this time, the travel adapter 100 can adjust the amount of current based on the current demand amount received from the mobile terminal connected to the travel adapter.

At this time, the travel adapter 100 may transmit information regarding the amount of current to be adjusted to each mobile terminal connected to the travel adapter. For example, the travel adapter 100 may transmit to the first terminal 200 information on the amount of electric power supplied to the first to third terminals 200-220. The first terminal 200 can display on the display unit how the data is exchanged with other terminals based on the information on the amount of current. For example, as shown in FIG. 4B, it is possible to inform that the second terminal 210 exchanges data in the "CDP" manner and the third terminal 220 exchanges data in the "SDP" have.

On the other hand, the mobile terminal can set whether or not data communication can be performed based on the USB OTG with another terminal. More specifically, when the mobile terminal is connected to the other terminal by the travel adapter, the mobile terminal can be set not to exchange data with the other terminal, or can exchange data with each other. For example, when the first terminal 200 is set not to perform data communication with the second terminal 210, even if the first and second terminals 200 and 210 are connected by the travel adapter 100, The second terminal 200 restricts the functions associated with the second terminal 210 from being executed.

This setting can be made by user input. More specifically, the mobile terminal may sense another terminal electrically connected by the travel adapter, and may store setting information related to the other terminal. When the terminal is connected to a new terminal in which the setting information is not stored, setting information related to the new terminal can be generated. The setting information may include the time at which the connection was made, the type of data transmitted and received, whether data communication is permitted, and the like.

For example, referring to FIG. 4C, when a new terminal "LG notebook" is electrically connected by the travel adapter 100, the mobile terminal 200 can generate setting information for the new terminal. Then, whether to perform data communication based on the new terminal and the USB OTG can be stored in the setting information based on the user input. Specifically, when the new terminal is electrically connected, the mobile terminal displays a user interface configured to select whether data communication is allowed or not, and determines whether or not to allow the data communication based on the user input applied to the user interface Can be set. If data communication is allowed, information associated with the new terminal may be added to the list and displayed.

Since the list of terminals allowed to communicate data by the travel adapter 100 is displayed on the host terminal and the information of connected terminals and the manner of data communication are included in the list, Can be used.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Travel adapter: 100,
Male connector: 110,
Female connector: 120,
Sub female connector 122,
Plug 130,
A control unit 140,
Amperage control circuit: 150

Claims (7)

A male connector configured to be connected to a first terminal to which USB On-The-Go (OTG) is applied;
The first and second terminals being connected to a second terminal by a USB, the first and second terminals being connected to the male connector to exchange data based on the USB OTG (On-The-Go) (female connector);
A plug inserted into the socket and receiving power supplied from the outside; And
When the power supplied from the outside is received to the plug, the power supplied from the outside is transmitted to the first and second terminals, and when power supplied from the outside is not received to the plug, And a controller for transmitting the supplied power to the second terminal. The method according to claim 1,
The first and third terminals are connected to a third terminal by a USB, and the first and third terminals are connected to the male connector to exchange data based on the USB OTG (On-The-Go) Further comprising a sub female connector,
Wherein,
When the power supplied from the outside is received to the plug, the power supplied from the outside is transmitted to the first to third terminals, and when power supplied from the outside is not received to the plug, And transmits the supplied power to the second and third terminals. The method according to claim 1,
Wherein the first and second terminals mutually exchange data based on the USB OTG (On-The-Go) while performing charging using power supplied from the outside. The method according to claim 1,
Further comprising a current amount adjustment circuit for adjusting an amount of current delivered to at least one of the first and second terminals based on a current requirement of at least one of the first and second terminals. 5. The method of claim 4,
The current amount control circuit includes:
A first current amount control circuit for controlling an amount of current delivered to the first terminal based on a current demanded amount of the first terminal; And
And a second current amount control circuit for controlling an amount of current to be transmitted to the second terminal based on a current requirement of the second terminal. The method according to claim 1,
Wherein,
Wherein a size of a resistance connected to an ID pin provided on the male connector is changed based on whether power supplied from the outside is received in the plug. The method according to claim 6,
Wherein the first terminal is configured to determine charging or discharging based on a magnitude of a resistance connected to the ID pin.

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