KR102044212B1 - Method for assigning different addresses on a plurality of slave devices using I2C communication protocol and a device for the same - Google Patents

Abstract

An I2C system device including devices supporting I2C communication, comprising: a master device including an SCL terminal and an SDA terminal, and a first slave device including an SCL terminal and an SDA terminal, wherein the first slave device comprises: It is determined whether the SCL terminal and the SDA terminal of the first slave device are connected to the SCL terminal and the SDA terminal of the master device or to the SDA terminal and the SCL terminal of the master device, respectively. When it is determined that the SCL terminal and the SDA terminal are respectively connected to the SCL terminal and the SDA terminal of the master device, the SCL terminal and the SDA terminal are automatically set to use the first address as the address of the first slave device, If it is determined that the SCL terminal and the SDA terminal are respectively connected to the SDA terminal and the SCL terminal of the master device, the primary of the first slave device As is automatically set to use a second address.

Description

Method for assigning different addresses on a multiple of slave devices using I2C communication protocol and a device for the same}

TECHNICAL FIELD The present invention relates to a device using an I2C communication protocol and a system composed thereof, and more particularly, to a technology for automatically allocating addresses of slave devices communicating with a master device.

Recently, chipsets having the same structure have been used for controlling a plurality of devices such as front and rear cameras and dual cameras.

I2C, on the other hand, is a serial computer bus developed by Philips that is used to connect low-speed peripherals to motherboards, embedded systems, and cell phones. I2C uses two bidirectional open collector or open drain lines: serial data (SDA) and serial clock (SCL) with pull-up resistors. In the I2C communication scheme, one master device and one or more slave devices may be used.

When using the same structured chipsets (ie slave chipsets, slave devices) in I2C communication, operation on a unified bus to reduce complexity due to communication lines connected to the master chipset (ie master device) This is preferred.

In order to operate the chipsets of the same structure in the unified bus, it is necessary to give each chipset a different slave address. As one method for this, a method of fixing different slave addresses to slave chipsets of the same structure may be used. However, according to the above method, there is a problem in that address management is inconvenient, and the possibility of misusing a slave address increases. Alternatively, a slave address may be allocated to slave chipsets of the same structure according to configuration of separate H / W pins. However, in this case, there is a problem that the separate H / W pin is required.

As a related patent, there is Korea Patent Publication 10-2011-0133423. The Korean Laid-Open Patent relates to I2C address translation, and is a technology for converting and outputting the original I2C address to the converted I2C address by receiving the original I2C address.

In order to solve the above-mentioned problem, the present invention provides an I2C communication device and an I2C system device capable of automatically allocating slave addresses to slave chipsets having the same structure without additional pins.

According to an aspect of the present invention can provide an I2C system device including devices that support I2C communication. The I2C system apparatus includes a master apparatus including an SCL terminal and an SDA terminal; And a first slave device including an SCL terminal and an SDA terminal. In this case, the first slave device, whether the SCL terminal and SDA terminal of the first slave device is connected to the SCL terminal and SDA terminal of the master device, respectively, or is connected to the SDA terminal and SCL terminal of the master device; If it is determined that the SCL terminal and the SDA terminal of the first slave device, respectively, is connected to the SCL terminal and the SDA terminal of the master device, to automatically use the first address as the address of the first slave device. If it is determined that the SCL terminal and the SDA terminal of the first slave device are connected to the SDA terminal and the SCL terminal of the master device, respectively, the second address is automatically used as the address of the first slave device. Can be set.

In this case, the apparatus further includes a second slave device including an SCL terminal and an SDA terminal, wherein the second slave device includes an SCL terminal and an SDA terminal of the second slave device, respectively, on the SCL terminal and the SDA terminal of the master device. Is connected to the SDA terminal and the SCL terminal of the master device, and it is determined that the SCL terminal and the SDA terminal of the second slave device are respectively connected to the SCL terminal and the SDA terminal of the master device. Is automatically set to use the first address as the address of the second slave device, and it is determined that the SCL terminal and the SDA terminal of the second slave device are respectively connected to the SDA terminal and the SCL terminal of the master device. May be automatically set to use the second address as the address of the second slave device.

In this case, (1) the SCL terminal and the SDA terminal of the first slave device are respectively connected to the SCL terminal and the SDA terminal of the master device, and the SCL terminal and the SDA terminal of the second slave device are respectively SDA of the master device. Or (2) the SCL terminal and the SDA terminal of the second slave device are connected to the SCL terminal and the SDA terminal of the master device, respectively, and the SCL terminal and the SDA terminal of the first slave device. The terminals may be connected to the SDA terminal and the SCL terminal of the master device, respectively.

In this case, the first slave device and the second slave device may be devices having the same structure as each other.

According to an aspect of the present disclosure, an I2C communication apparatus including an SDA terminal and an SCL terminal may be provided. The I2C communication apparatus includes an I2C control unit including a first terminal connected to the SDA terminal and a second terminal connected to the SCL terminal; And a terminal connection state detector configured to determine a terminal from which an clock signal from an external device is received among the SDA terminal and the SCL terminal. At this time, the I2C control unit (1) when it is determined that the terminal for receiving the clock signal is the SCL terminal, uses the first terminal as the data terminal and the second terminal as the clock terminal, and the I2C A first address is used as an address of a communication device. (2) When it is determined that the terminal on which the clock signal is received is the SDA terminal, the second terminal is used as a data terminal and the first terminal is used as a clock terminal. The second address may be used as the address of the I2C communication device.

According to another aspect of the present invention, an I2C communication apparatus including an SDA terminal and an SCL terminal can be provided. The I2C communication apparatus includes an I2C control unit including a first terminal and a second terminal; A switch unit selectively connecting an SDA terminal and an SCL terminal to the first terminal and the second terminal; And a terminal connection state detector configured to determine a terminal from which an clock signal from an external device is received among the SDA terminal and the SCL terminal. In this case, when it is determined that the terminal for receiving the clock signal is the SCL terminal, the switch unit connects the first terminal and the second terminal to the SDA terminal and the SCL terminal, respectively, (2 If it is determined that the terminal for receiving the clock signal is the SDA terminal, the first terminal and the second terminal are respectively connected to the SCL terminal and the SDA terminal, and the I2C control unit (1) When it is determined that the terminal for receiving the clock signal is the SCL terminal, the first address is used as the address of the I2C communication apparatus. (2) When it is determined that the terminal for receiving the clock signal is the SDA terminal. The second address may be used as the address of the I2C communication device.

According to still another aspect of the present invention, an I2C communication apparatus including an SDA terminal and an SCL terminal may be provided. The I2C communication apparatus includes an I2C control unit including a first terminal connected to the SDA terminal and a second terminal connected to the SCL terminal; And the SDA terminal and the SCL terminal are connected to the SDA terminal and the SCL terminal of the other I2C communication apparatus, respectively, with the I2C communication apparatus connected to another external I2C communication apparatus, otherwise the SDA terminal and the SCL terminal. And a terminal connection state detection unit which determines whether each is connected to an SCL terminal and an SDA terminal of the other I2C communication device. At this time, the I2C control unit, (1) when it is determined that the SDA terminal and the SCL terminal is connected to the SDA terminal and the SCL terminal of the other I2C communication device, respectively, the first terminal as the data terminal and the second A terminal is used as a clock terminal, and a first address is used as an address of the I2C communication device, and (2) it is determined that the SDA terminal and the SCL terminal are connected to the SCL terminal and the SDA terminal of the other I2C communication device, respectively. The second terminal may be used as a data terminal, the first terminal as a clock terminal, and a second address as an address of the I2C communication device.

An I2C communication device including an SDA terminal and an SCL terminal according to another aspect of the present invention, comprising a data terminal and a clock terminal, wherein the first I2C control unit is configured to use a first address as an address of the I2C communication device. ; A second I2C controller having the same structure as the first I2C controller and adapted to use a second address as an address of the I2C communication apparatus; And a selector configured to select one of the first I2C controller and the second I2C controller to activate the selected I2C controller and deactivate the unselected I2C controller. In this case, the data terminal and the clock terminal of the first I2C controller are respectively connected to the SDA terminal and the SCL terminal, and the data terminal and the clock terminal of the second I2C controller are respectively connected to the SCL terminal and the SDA terminal. Connected, and the selector determines an I2C controller capable of (successfully) decoding a specific packet received through the SDA terminal and the SCL terminal, from the first I2C controller and the second I2C controller, It may be configured to activate the determined I2C control unit.

According to the present invention, by using the I2C communication device, it is possible to automatically assign different slave addresses to slave chipsets of the same structure without additional pins.

1 is a view for explaining an I2C system apparatus according to an embodiment of the present invention.
Figure 2a shows the internal configuration of the first slave device and the second slave device according to the first embodiment of the present invention, Figure 2b shows the structure of the I2C system device according to the first embodiment of the present invention.
FIG. 3A illustrates the internal configurations of the first slave device and the second slave device according to the second embodiment of the present invention, and FIG. 3B illustrates the structure of the I2C system device according to the second embodiment of the present invention.
FIG. 4A shows the internal configuration of the first slave device and the second slave device according to the third embodiment of the present invention, and FIG. 4B shows the structure of the I2C system device according to the third embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings an embodiment of the present invention will be described. However, the present invention is not limited to the embodiments described herein and may be implemented in various other forms. The terminology used herein is for the purpose of understanding the embodiments and is not intended to limit the scope of the invention. Also, the singular forms used below include the plural forms unless the phrases clearly indicate the opposite meanings.

1 is a view for explaining an I2C system apparatus according to an embodiment of the present invention.

The I2C system device may include a master device 1 that supports I2C communication, a first slave device 2, and a second slave device 3 having the same structure as the first slave device 2. . Here, the master device and the slave device may be ICs. The I2C system apparatus may also be referred to herein as an I2C system.

The present invention is to provide a method for automatically setting the address of each slave device to slave devices having the same structure by using the I2C system device. Here, 'slave devices having the same structure' may refer to ICs manufactured by the same process and using the I2C communication protocol as an IC having the same internal structure and the same part number.

In the present invention, each slave device may be referred to as an I2C communication device.

The master device 1 is an IC including the SCL terminal 11 and the SDA terminal 12, and serves as a master according to the I2C communication protocol.

In the first slave device 2, the SCL terminal 21 and the SDA terminal 22 of the first slave device 2 are connected to the SCL terminal 11 and the SDA terminal 12 of the master device 1, respectively. It may be determined whether or not it is connected, or whether it is connected to the SDA terminal 12 and the SCL terminal 11 of the master device (1).

In the present specification, when the SCL terminal 21 and the SDA terminal 22 of the first slave device 2 are connected to the SCL terminal 11 and the SDA terminal 12 of the master device 1, respectively. It can be referred to as 'cross-linked'. On the contrary, in the first slave device 2, the SCL terminal 21 and the SDA terminal 22 of the first slave device 2 are respectively the SDA terminal 12 and the SCL terminal of the master device 1 ( 11) may be referred to as 'cross-linked'. In the case of using an I2C communication protocol supporting chipset to which the present invention is not applied, it can be expected that the system will operate normally when it is 'cross-connected', and that it can not be expected to operate normally when it is 'cross-linked'.

Subsequently, in the first slave device 2, the SCL terminal 21 and the SDA terminal 22 of the first slave device 2 are respectively the SCL terminal 11 and the SDA terminal 12 of the master device 1. ), That is, when it is determined to be non-crosslinked, it may be automatically set to use the first address as the address of the first slave device 2.

In contrast, in the first slave device 2, the SCL terminal 21 and the SDA terminal 22 of the first slave device 2 are respectively the SDA terminal 12 and the SCL terminal of the master device 1. If it is determined that the connection to the (11), that is, it is determined that the cross-connected, it can be automatically set to use the second address as the address of the first slave device (2).

Here, the first address and the second address may be different values previously stored in the first slave device. The first address and the second address may be stored in a storage unit provided in the first slave device, respectively.

For example, in FIG. 1, in the first slave device 2, the SCL terminal 21 and the SDA terminal 22 of the first slave device 2 are respectively the SCL terminal 11 and the master device 1. Since it is connected (crosslinked) to the SDA terminal 12, it can be automatically set to use the first address as the address of the first slave device 2.

Similarly to the first slave device 2, the SCL terminal 31 and the SDA terminal 32 of the second slave device 3 of the second slave device 3 are each SCL of the master device 1. Is it connected to the terminal 11 and the SDA terminal 12, i.e. non-cross-connected, otherwise connected to the SDA terminal 12 and the SCL terminal 11 of the master device 1, i.e. cross-connected It can be determined whether or not, and the address of the second slave device 3 can be set automatically.

For example, in FIG. 1, in the second slave device 3, the SCL terminal 31 and the SDA terminal 32 of the second slave device 3 are respectively the SDA terminal 12 and the master device 1. Since it is connected (cross-connected) to the SCL terminal 11, it can be automatically set to use the second address as the address of the second slave device 3.

The first slave device 2 and the second slave device 3 are devices having the same structure, but differ only in that they are cross-connected or non-cross-connected to the master device 1.

2A shows the internal configuration of the first slave device and the second slave device according to the first embodiment of the present invention.

2B shows the structure of an I2C system apparatus according to a first embodiment of the present invention.

The first slave device 2 may include an SCL terminal 21 and an SDA terminal 22. The first slave device 2 may include an I2C controller 210, a switch 230, and a terminal connection state detector 240.

The I2C controller 210 may include a first terminal 211 and a second terminal 212.

The second slave device 3 may include an SCL terminal 31 and an SDA terminal 32. The second slave device 3 may include an I2C control unit 310, a switch unit 340, and a terminal connection state detection unit 340.

The I2C controller 310 may include a first terminal 311 and a second terminal 312.

As described above, the first slave device 2 and the second slave device 3 may have the same structure.

The first slave device 2 and the second slave device 3 may be connected to the master device 1, respectively, as shown in FIG. 2B.

The master device 1 may comprise an SCL terminal 11 and an SDA terminal 12.

For example, the SCL terminal 21 and the SDA terminal 22 of the first slave device 2 are to be connected (crosslinked) to the SCL terminal 11 and the SDA terminal 12 of the master device 1, respectively. Can be. In addition, the SCL terminal 31 and the SDA terminal 32 of the second slave device 3 may be connected (cross-connected) to the SDA terminal 12 and the SCL terminal 11 of the master device 1, respectively. .

Hereinafter, the first slave device 2 will be described.

The SCL terminal 21 and the SDA terminal 22 of the first slave device 2 are connected to the SCL terminal 11 of the master device 1 and the eleventh transmission line TL11 and the twelfth transmission line TL12, respectively. It may be connected (crosslinked) with the SDA terminal 12. The SCL terminal 21 and the SDA terminal 22 of the first slave device 2 may receive a clock signal and a data signal through the eleventh transmission line TL11 and the twelfth transmission line TL12, respectively.

The terminal connection state detection unit 240 of the first slave device 2 may receive signals detected from the SCL terminal 21 and the SDA terminal 22, respectively. The terminal connection state detector 240 may determine a terminal from which the clock signal is received among the received signals. When the terminal connection state detection unit 240 determines a terminal for receiving a clock signal, the terminal connection state detection unit 240 may transmit the determined result to the switch unit 230 and the I2C control unit 210. For example, in FIG. 2B, a terminal for receiving the clock signal may be an SCL terminal 21.

The switch unit 230 of the first slave device 2 selectively connects the SCL terminal 21 and the SDA terminal 22 to the first terminal 211 and the second terminal 212 of the I2C control unit 210. Can connect In this case, the 'selection' may be performed depending on which of the SCL terminal 21 and the SDA terminal 22 is the terminal from which the clock signal is received. That is, when it is determined that the terminal for receiving the clock signal is the SCL terminal 21, the switch unit 230 connects the first terminal 211 and the second terminal 212 to the SCL terminal, respectively. 21) and the SDA terminal 22, and (2) when it is determined that the terminal from which the clock signal is received is the SDA terminal 22, the first terminal 211 and the second terminal 212. ) May be connected to the SDA terminal 22 and the SCL terminal 21, respectively. For example, in FIG. 2B, since it is determined that the terminal for receiving the clock signal is the SCL terminal 21, the switch unit 230 includes the first terminal 211 and the second terminal 212. May be connected to the SCL terminal 21 and the SDA terminal 22, respectively.

Determining whether a clock signal or a data signal is received through a specific terminal can be implemented in various ways by one of ordinary skill in the art, and thus, the method is not described in detail. . However, it can be easily understood that the clock signal and the data signal can be determined separately from each other when using an internal clock that is sufficiently faster than the period of the clock signal to be received.

If it is determined that the terminal from which the clock signal is received is the SCL terminal 21, the I2C control unit 210 uses the first address as the address of the first slave device 2, and the clock signal is received. If it is determined that the terminal to be the SDA terminal 22, the second address may be used as the address of the first slave device (2). For example, in FIG. 2B, since it is determined that the terminal for receiving the clock signal is the SCL terminal 21, the first address may be used as the address of the first slave device 2.

In the present specification, in the slave device according to an embodiment of the present invention using the I2C communication protocol, any one of an SCL terminal and an SDA terminal of the slave device is used as a clock terminal and which one is used as a data terminal. It can be regarded as a module that has a function of determining. Along with this, a function of determining an address to be used by the corresponding slave device may be performed.

The above descriptions of the first slave device 2 may be equally applied to the second slave device 3.

At this time, the SCL terminal 21, the SDA terminal 22, the I2C control unit 210, the switch unit 230, the terminal connection state detection unit 240, the first terminal 211 and the first slave device 2 of the first slave device (2) The two terminals 212 are SCL terminal 31, SDA terminal 32, I2C control unit 310, switch unit 340, terminal connection state detection unit 340, and first terminal of the second slave device 3, respectively. 311 and the second terminal 312.

For example, in FIG. 2B, if the same principle as that of the address setting principle of the first slave device 2 is applied to the second slave device 3, the second slave device 3 may be configured as the second slave device ( A second address can be used as the address of 3).

In summary, in the first embodiment of FIGS. 2A and 2B, the first slave device 2 and the second slave device 3 may automatically allocate an internal address according to an external connection state.

FIG. 3A illustrates the internal configurations of the first slave device and the second slave device according to the second embodiment of the present invention, and FIG. 3B illustrates the structure of the I2C system device according to the second embodiment of the present invention.

The first slave device 2 may include an SCL terminal 21 and an SDA terminal 22. The first slave device 2 may include an I 2 C controller 210 and a terminal connection state detector 240.

The I2C controller 210 may include a first terminal 211, a second terminal 212, a switch unit 213, and a clock and data input / output unit 214.

The clock and data input / output unit 214 may include a clock terminal CLK and a data terminal D. The clock and data input / output unit 214 provides the clock and data input from the first terminal 211 and the second terminal 212 to other logic (not shown) existing in the first slave device 2, or The first slave device 2 may serve to provide a clock and data to the master device 1.

The second slave device 3 may include an SCL terminal 31 and an SDA terminal 32. The second slave device 3 may include an I 2 C controller 310 and a terminal connection state detector 340.

The I2C controller 310 may include a first terminal 311, a second terminal 312, a switch unit 313, and a clock and data input / output unit 314.

The function of the clock and data input / output unit 314 of the second slave device 3 may be the same as that of the clock and data input / output unit 214 of the first slave device 2.

As described above, the first slave device 2 and the second slave device 3 may have the same structure.

The first slave device 2 and the second slave device 3 may be connected to the master device 1, respectively, as shown in FIG. 3B.

The connection relationship between the master device 1, the first slave device 2, and the second slave device 3 may be the same as described above with reference to FIG. 3B.

Hereinafter, the first slave device 2 will be described.

The SCL terminal 21 and the SDA terminal 22 of the first slave device 2 are connected to the SCL terminal 11 of the master device 1 and the eleventh transmission line TL11 and the twelfth transmission line TL12, respectively. It may be connected to the SDA terminal 12. The SCL terminal 21 and the SDA terminal 22 of the first slave device 2 transmit clock signals and data signals from the master device 1 via the eleventh transmission line TL11 and the twelfth transmission line TL12, respectively. I can receive it.

The terminal connection state detection unit 240 of the first slave device 2 may receive signals transmitted from the SCL terminal 21 and the SDA terminal 22, respectively. The terminal connection state detector 240 may determine a terminal from which the clock signal is received among the received signals. When the terminal connection state detector 240 determines a terminal for receiving a clock signal, the terminal connection state detector 240 may transmit the determined result to the switch unit 213 of the I2C controller 210. For example, in FIG. 3B, a terminal for receiving the clock signal may be an SCL terminal 21.

The first terminal 211 and the second terminal 212 of the I2C controller 210 of the first slave device 2 may be connected to the SCL terminal 21 and the SDA terminal 22, respectively. Accordingly, the switch unit 213 of the I2C control unit 210 connects the first terminal 211 and the second terminal 212 to the clock terminal CLK and the data terminal D of the clock and data input / output unit 214. ) Can optionally be connected.

That is, when it is determined that the terminal for receiving the clock signal is the SCL terminal 21, the switch unit 213 connects the first terminal 211 and the second terminal 212 to the clock terminal, respectively. (CLK) and the data terminal (D), and vice versa, when the terminal receiving the clock signal is determined to be the SDA terminal 22, the first terminal 211 and the second terminal 212 may be connected to the data terminal D and the clock terminal CLK, respectively. For example, in FIG. 3B, since it is determined that the terminal for receiving the clock signal is the SCL terminal 21, the switch unit 213 may include the first terminal 211 and the second terminal 212. May be connected to the clock terminal CLK and the data terminal D, respectively.

If it is determined that the terminal from which the clock signal is received is the SCL terminal 21, the I2C controller 210 uses the first terminal 211 as a clock terminal and uses the second terminal 212 as data. It can be used as a terminal. In this case, the first address may be used as the address of the first slave device 2. Alternatively, when it is determined that the terminal for receiving the clock signal is the SDA terminal 22, the I2C controller 210 uses the second terminal 212 as a clock terminal and uses the first terminal 211. It can be used as a data terminal. In this case, the second address may be used as the address of the first slave device 2.

The above descriptions of the first slave device 2 may be equally applied to the second slave device 3.

At this time, the SCL terminal 21, the SDA terminal 22, the I2C control unit 210, the first terminal 211, the second terminal 212, the switch unit 213, the clock and the like of the first slave device 2 The data input / output unit 214 and the terminal connection state detection unit 240 are each an SCL terminal 31, an SDA terminal 32, an I2C control unit 310, a first terminal 311, and a second slave device 3. The second terminal 312, the switch unit 313, the clock and data input / output unit 314, and the terminal connection state detector 340 may correspond to each other.

For example, in FIG. 3B, if the same principle as that of the address setting principle of the first slave device 2 is applied to the second slave device 3, the second slave device 3 may be configured as the second slave device ( A second address can be used as the address of 3).

In summary, in the second embodiment of FIGS. 3A and 3B, the first slave device 2 may be automatically set to use the first address and the second slave device 3 to use the second address.

FIG. 4A shows the internal configuration of the first slave device and the second slave device according to the third embodiment of the present invention, and FIG. 4B shows the structure of the I2C system device according to the third embodiment of the present invention.

The first slave device 2 may include an SCL terminal 21 and an SDA terminal 22. The first slave device 2 may include a first I2C controller 210, a second I2C controller 220, and a selector 250. The first slave device 2 may also include other internal circuits not shown in FIG. 4A.

The first I2C controller 210 may include a first terminal 211 and a second terminal 212. For example, the first terminal 211 may be a clock terminal, and the second terminal 212 may be a data terminal. The first I2C controller 210 may be configured to use the first address as the address of the first slave device 2.

The second I2C controller 220 may have the same structure as the first I2C controller 210. That is, the second I2C controller 220 may include a third terminal 221 and a fourth terminal 222. For example, the third terminal 221 may be a clock terminal, and the fourth terminal 222 may be a data terminal. The second I2C controller 220 may be configured to use the second address as the address of the first slave device 2.

The selector 250 selects one of the first I2C controller 210 and the second I2C controller 220 to activate the selected I2C controller 210 or 220, and not select the selected I2C controller 220. Or 210 may be deactivated. Here, the meaning of 'activated' and 'deactivated' may mean that the 'activated' I2C controller is used and the 'deactivated' I2C controller is not used.

The first slave device 2 and the second slave device 3 may have the same structure.

The second slave device 3 may include an SCL terminal 31 and an SDA terminal 32. The second slave device 3 may include a first I2C controller 310, a second I2C controller 320, and a selector 350.

The first I2C controller 310 may include a first terminal 311 and a second terminal 312. For example, the first terminal 311 may be a clock terminal, and the second terminal 312 may be a data terminal. The first I2C controller 310 may be configured to use the first address as the address of the second slave device 3.

The second I2C controller 320 may have the same structure as the first I2C controller 310. That is, the second I2C controller 320 may include a third terminal 321 and a fourth terminal 322. For example, the third terminal 321 may be a clock terminal, and the fourth terminal 322 may be a data terminal. The second I2C controller 320 may be configured to use the second address as the address of the second slave device 3.

The selector 350 selects one of the first I2C controller 310 and the second I2C controller 320 to activate the selected I2C controller 310 or 320, and not select the selected I2C controller 320. Or 310 may be deactivated.

The first slave device 2 and the second slave device 3 may be connected to the master device 1, as shown in FIG. 4B. The connection relationship between the master device 1, the first slave device 2, and the second slave device 3 may be the same as described above with reference to FIG. 2B.

Hereinafter, the first slave device 2 will be described.

The SCL terminal 21 and the SDA terminal 22 of the first slave device 2 are respectively the SCL terminal 11 and the SDA of the master device 1 via the eleventh transmission line TL11 and the twelfth transmission line TL12. The clock signal and the data signal may be transmitted from the terminal 12.

The first terminal (eg, clock terminal) 211 and the second terminal (eg, data terminal) 212 of the first I2C controller 210 of the first slave device 2 are each the SCL terminal 21. And SDA 22 terminals. That is, the first terminal (eg, clock terminal) 211 and the second terminal (eg, data terminal) 212 of the first I2C controller 210 are the SCL terminal 21 and the SDA terminal 22. It is possible to receive signals transmitted from each.

The third terminal (eg, clock terminal) 221 and the fourth terminal (eg, data terminal) 222 of the second I2C controller 220 of the first slave device 2 are each an SDA terminal 22 and It may be connected to the SCL terminal 21. That is, the third terminal (eg, clock terminal) 221 and the fourth terminal (eg, data terminal) 222 of the first I2C controller 210 are the SDA terminal 22 and the SCL terminal 21. It is possible to receive signals transmitted from each.

The selector 250 of the first slave device 2 is received through the SCL terminal 21 and the SDA terminal 22 of the first I2C controller 210 and the second I2C controller 220. By determining the I2C control unit that can successfully decode the specific packet to be activated, it is possible to activate the determined I2C control unit. In this case, the successful decoding of the specific packet may mean that the data packet transmitted from the master device 1 is decoded as a data signal rather than a clock signal.

For example, the selector 250 is an I2C controller capable of successfully decoding a specific packet received through the SCL terminal 21 and the SDA terminal 22, and the SCL terminal 21 to which a clock signal is transmitted. The first I2C controller 210 to which the first terminal (eg, the clock terminal) 211 is connected may be selected. The selector 250 may activate the selected first I2C controller 210 and deactivate the second I2C controller 220 that is not selected. That is, the first I2C controller 210 may be in charge of the communication function of the first slave device 2.

 The above descriptions of the first slave device 2 may be equally applied to the second slave device 3.

At this time, the SCL terminal 21, the SDA terminal 22, the first I2C control unit 210, the first terminal 211, the second terminal 212, and the second I2C control unit 220 of the first slave device 2. ), The third terminal 221, the fourth terminal 222, and the selector 250 are each an SCL terminal 31, an SDA terminal 32, and a first I2C controller 310 of the second slave device 3. ), The first terminal 311, the second terminal 312, the second I2C controller 320, the third terminal 321, the fourth terminal 322, and the selection unit 350.

For example, in FIG. 4B, when the same principle as that of the address setting principle of the first slave device 2 is applied to the second slave device 3, the second I2C controller 320 of the second slave device 3 is applied. Can be in charge of the communication function of the second slave device (3). That is, the second slave device 3 may use the second address as the address of the second slave device 3.

In summary, in the third embodiment of FIGS. 4A and 4B, the first slave device 2 may be automatically set to use the first address and the second slave device 3 to use the second address.

By using the embodiments of the present invention described above, those belonging to the technical field of the present invention will be able to easily make various changes and modifications without departing from the essential characteristics of the present invention. The content of each claim in the claims may be combined in another claim without citations within the scope of the claims.

Claims (18)

An I2C system device comprising devices that support I2C communication,
A master device comprising an SCL terminal and an SDA terminal; And
A first slave device comprising an SCL terminal and an SDA terminal;
Including;
The first slave device,
Determining whether the SCL terminal and the SDA terminal of the first slave device are respectively connected to the SCL terminal and the SDA terminal of the master device or to the SDA terminal and the SCL terminal of the master device,
If it is determined that the SCL terminal and the SDA terminal of the first slave device are respectively connected to the SCL terminal and the SDA terminal of the master device, it is automatically set to use the first address as the address of the first slave device.
If it is determined that the SCL terminal and the SDA terminal of the first slave device are respectively connected to the SDA terminal and the SCL terminal of the master device, the second slave device is automatically set to use the second address as the address of the first slave device.
I2C system unit. The method of claim 1,
Further comprising a second slave device comprising an SCL terminal and an SDA terminal,
The second slave device,
Determining whether the SCL terminal and the SDA terminal of the second slave device are connected to the SCL terminal and the SDA terminal of the master device or to the SDA terminal and the SCL terminal of the master device, respectively,
If it is determined that the SCL terminal and the SDA terminal of the second slave device are respectively connected to the SCL terminal and the SDA terminal of the master device, the second address is automatically set to use the first address as the address of the second slave device. ,
If it is determined that the SCL terminal and the SDA terminal of the second slave device are respectively connected to the SDA terminal and the SCL terminal of the master device, the second address is automatically set to use the second address as the address of the second slave device. ,
I2C system unit. The method of claim 2,
(1) The SCL terminal and the SDA terminal of the first slave device are respectively connected to the SCL terminal and the SDA terminal of the master device, and the SCL terminal and the SDA terminal of the second slave device are respectively the SDA terminal and the SDA terminal of the master device. Connected to the SCL terminal, or
(2) The SCL terminal and the SDA terminal of the second slave device are connected to the SCL terminal and the SDA terminal of the master device, respectively, and the SCL terminal and the SDA terminal of the first slave device are respectively the SDA terminal and the SDA terminal of the master device. Connected to the SCL terminal,
I2C system unit. The I2C system apparatus according to claim 2, wherein the first slave apparatus and the second slave apparatus are devices having the same structure as each other. An I2C communication device including an SDA terminal and an SCL terminal,
An I2C controller including a first terminal connected to the SDA terminal and a second terminal connected to the SCL terminal; And
A terminal connection state detector for determining a terminal from which an external clock signal is received among the SDA terminal and the SCL terminal;
Including;
The I2C control unit (1) uses the first terminal as a data terminal and the second terminal as a clock terminal when it is determined that the terminal through which the clock signal is received is the SCL terminal, and the I2C communication apparatus. (2) When it is determined that the terminal receiving the clock signal is the SDA terminal, the second terminal is used as the data terminal and the first terminal is used as the clock terminal. And use a second address as the address of the I2C communication device.
I2C communication device. An I2C communication device including an SDA terminal and an SCL terminal,
An I2C control unit including a first terminal and a second terminal;
A switch unit selectively connecting an SDA terminal and an SCL terminal to the first terminal and the second terminal; And
A terminal connection state detector for determining a terminal from which an external clock signal is received among the SDA terminal and the SCL terminal;
Including;
The switch unit may be configured to (1) connect the first terminal and the second terminal to the SDA terminal and the SCL terminal, respectively, when it is determined that the terminal for receiving the clock signal is the SCL terminal. When it is determined that the terminal receiving the clock signal is the SDA terminal, the first terminal and the second terminal are connected to the SCL terminal and the SDA terminal, respectively.
The I2C control unit uses (1) the first address as the address of the I2C communication apparatus when it is determined that the terminal on which the clock signal is received is the SCL terminal, and (2) the terminal on which the clock signal is received When determined to be the SDA terminal, the second address is used as the address of the I2C communication apparatus.
I2C communication device. An I2C communication device including an SDA terminal and an SCL terminal,
An I2C controller including a first terminal connected to the SDA terminal and a second terminal connected to the SCL terminal; And
When the I2C communication device is connected to another external I2C communication device, whether the SDA terminal and the SCL terminal are connected to the SDA terminal and the SCL terminal of the other I2C communication device, respectively, otherwise the SDA terminal and the SCL terminal are connected. A terminal connection state detector for determining whether each of the other I2C communication devices is connected to an SCL terminal and an SDA terminal;
Including;
The I2C control section, (1) when it is determined that the SDA terminal and the SCL terminal are connected to the SDA terminal and the SCL terminal of the other I2C communication device, respectively, the first terminal is used as a data terminal and the second terminal is used. Used as a clock terminal, using a first address as an address of the I2C communication device, and (2) when it is determined that the SDA terminal and the SCL terminal are respectively connected to the SCL terminal and the SDA terminal of the other I2C communication device, The second terminal is used as a data terminal, the first terminal is used as a clock terminal, and a second address is used as an address of the I2C communication apparatus.
I2C communication device. An I2C communication device including an SDA terminal and an SCL terminal,
A first I2C controller, comprising a data terminal and a clock terminal, adapted to use a first address as an address of the I2C communication device;
A second I2C controller having the same structure as the first I2C controller and adapted to use a second address as an address of the I2C communication apparatus; And
A selection unit configured to select one of the first I2C control unit and the second I2C control unit to activate the selected I2C control unit and deactivate the unselected I2C control unit;
Including;
The data terminal and the clock terminal of the first I2C controller are connected to the SDA terminal and the SCL terminal, respectively.
The data terminal and the clock terminal of the second I2C controller are connected to the SCL terminal and the SDA terminal, respectively.
The selector is configured to determine an I2C controller capable of decoding a specific packet received through the SDA terminal and the SCL terminal among the first I2C controller and the second I2C controller, and activate the determined I2C controller. ,
I2C communication device. A master device comprising a clock terminal and a data terminal; And
A first slave device comprising a clock terminal and a data terminal;
Including;
The first slave device,
When the clock terminal of the first slave device and the data terminal of the first slave device are respectively connected to the clock terminal of the master device and the data terminal of the master device, the first address is used as the address of the first slave device. And
When the clock terminal of the first slave device and the data terminal of the first slave device are respectively connected to the data terminal of the master device and the clock terminal of the master device, the second address is used as the address of the first slave device. Confused,
Master-slave communication system device. The method of claim 9,
A second slave device comprising a clock terminal and a data terminal,
The second slave device,
When the clock terminal of the second slave device and the data terminal of the second slave device are respectively connected to the clock terminal of the master device and the data terminal of the master device, the first address is used as the address of the second slave device. It is supposed to
When the clock terminal of the second slave device and the data terminal of the second slave device are respectively connected to the data terminal of the master device and the clock terminal of the master device, the second address is used as the address of the second slave device. Supposed to
Master-slave communication system device. The method of claim 10,
The clock terminal of the first slave device and the data terminal of the first slave device are respectively connected to the clock terminal of the master device and the data terminal of the master device, and
A clock terminal of the second slave device and a data terminal of the second slave device are respectively connected to a data terminal of the master device and a clock terminal of the master device;
Master-slave communication system device. The master-slave communication system apparatus according to claim 10, wherein the first slave apparatus and the second slave apparatus have the same structure. A communication device comprising a data terminal and a clock terminal,
A control unit including a first terminal connected to the data terminal and a second terminal connected to the clock terminal,
The control unit (1) when the terminal for receiving the clock signal is the clock terminal, uses the first terminal as a terminal for data use and the second terminal as a terminal for clock use. A first address is used as an address. (2) When the terminal for receiving the clock signal is the data terminal, the second terminal is used as a terminal for data and the first terminal is used as a terminal for clock. And using a second address as an address of the communication device,
Communication device. A communication device comprising a data terminal and a clock terminal,
A control unit including a first terminal used for data purposes and a second terminal used for clock purposes; And
A switch unit for selectively connecting the data terminal and the clock terminal to the first terminal and the second terminal;
Including;
The switch unit (1) when the terminal for receiving the clock signal is the clock terminal, the first terminal and the second terminal is connected to the data terminal and the clock terminal, respectively, (2) the clock signal is When the terminal to be received is the data terminal, the first terminal and the second terminal are connected to the clock terminal and the data terminal, respectively.
The control unit is (1) when the terminal where the clock signal is received is the clock terminal, the controller uses the first address as an address of the communication device, and (2) the terminal where the clock signal is received is the data terminal. In this case, the second address is used as the address of the communication device.
Communication device. A communication device comprising a data terminal and a clock terminal,
A first control unit comprising a data use terminal and a clock use terminal, the first control unit adapted to use a first address as an address of the communication device;
A second controller, comprising a terminal for data use and a terminal for clock use, adapted to use a second address as an address of the communication device; And
A selection unit configured to select one of the first control unit and the second control unit to activate the selected control unit and deactivate the unselected control unit;
Including;
The terminal for data use of the first control unit and the terminal for clock use of the first control unit are respectively connected to the data terminal and the clock terminal,
The terminal for data use of the second control unit and the terminal for clock use of the second control unit are respectively connected to the clock terminal and the data terminal,
The selecting unit is configured to determine a control unit capable of decoding a specific packet received through the data terminal or the clock terminal among the first control unit and the second control unit, and to activate the determined control unit.
Communication device. The communication apparatus according to any one of claims 13 to 15, wherein the communication apparatus is used as a slave apparatus in a master-slave communication system. A communication device comprising a data terminal and a clock terminal,
A control unit including a first terminal connected to the data terminal and a second terminal connected to the clock terminal,
The control unit,
(1) When the data terminal of the communication device and the clock terminal of the communication device are respectively connected to the data terminal of another communication device connected to the communication device and the clock terminal of the other communication device, the first terminal is used for data purposes. Use as a terminal and use the second terminal as a terminal for clock use, use a first address as an address of the communication device, and (2) the data terminal of the communication device and the clock terminal of the communication device are different from each other. When connected to the clock terminal of the communication device and the data terminal of the other communication device, the second terminal is used as a terminal for data use, the first terminal is used as a terminal for clock use, and the first terminal is used as an address of the communication device. It is supposed to use two addresses,
Communication device. The method of claim 17,
The communication device is a slave device in a master-slave communication system,
The other communication device is characterized in that the master device in the master-slave communication system,
Communication device.

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