KR20070029427A - A circuit of gausing a battery and a controlling method thereof - Google Patents

Abstract

A battery measuring circuit and a method for controlling the same are provided to reduce a program load of a portable electronic device by starting and terminating a charge based on information about the measured battery remaining quantity. A battery measuring circuit includes a detector(140), a repeater(148), and a control unit. The detector(140) detects discharging voltage, current, and temperature of a battery. The repeater(148) repeats data communication with electronic devices using the battery. The control unit calculates information related to a remaining quantity of the battery based on the detected voltage, current, and temperature by the detector(140). The control unit transmits a data packet which requests performance of an operation to the electronic devices via the repeater(148) based on the calculated information. The control unit transmits the data packet, which includes the information related to the remaining quantity of the battery in response to the data packet, to the electronic devices.

Description

Battery measuring circuit and control method {a Circuit of Gausing a Battery and a Controlling Method

In order to better understand the drawings used in the detailed description of the invention, a brief description of each drawing is provided.

1 is a block diagram illustrating a charging control device of a portable electronic device using a conventional battery measuring circuit.

2 is a block diagram illustrating a battery measuring circuit according to an exemplary embodiment of the present invention.

3A and 3B are diagrams illustrating a format of a data packet output from the battery measuring circuit of FIG. 2.

4 is a flowchart illustrating a control method of a battery measuring circuit according to an exemplary embodiment of the present invention.

`` Explanation of symbols for main parts of drawings ''

10: battery pack 12: battery

14 measurement integrated circuit chip 16 protector

20: portable electronic device 22: charger

24: program memory 26: CPU

140: detector 142: program memory

144: working memory 146: interrupt generator

148 repeater 150 processor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for measuring the amount of charge remaining in a battery, and more particularly, to a circuit for measuring a battery (Circuit) installed to configure one pack together with a battery to measure the remaining amount of the battery.

Typically, batteries are electronic devices that can be used on the go, such as mobile phones, PDAs (Portable Data Apparatus), notebook computers, handheld game machines, digital cameras, MP3 players, portable multimedia players (PMPs). It is used as a power supply to supply power for various portable electronic devices such as Multimedea Player). Because these batteries accumulate a limited amount of charges, they are forced to power portable electronics only for a limited time period. As a result, the user of the portable electronic device may lose important information in operation due to the completion of discharge of the battery or may not perform important work at a desired time. In addition, in the case of the rechargeable battery, the charge battery may be damaged due to excessive charging and discharging of the charge, or the life of the rechargeable battery may be reduced, thereby increasing the burden on the user of the portable electronic device. In order to prevent such a damage caused by the battery, there is a need for a battery level measurement technology that can instruct the user of the remaining charge of the battery.

There are two techniques for measuring the remaining battery capacity using a battery measuring integrated circuit (IC) chip and a method based only on the voltage (or current) of the battery. The measurement method based solely on the voltage (or current) of the battery has the advantage that the configuration is simple and the manufacturing cost is low, while the residual charge amount of the battery cannot be accurately measured. In contrast, the method using the battery measuring IC chip measures the amount of residual charge in the battery in consideration of various conditions such as changes in chemical characteristics, volume, current, and voltage inside the battery. In the method using this battery measuring IC chip, the accuracy and reliability of the residual charge amount measurement are ensured.

An example of a battery residual charge measurement method using such a battery gauge IC chip may include a portable electronic device having a charge control function as shown in FIG. 1. 1 are not directly related to the present invention, the components that may blur or confuse the gist of the present invention are not shown, but those skilled in the art through the circuit shown in FIG. The task, objectives and features will be fully understood.

Referring to FIG. 1, the battery measuring IC chip 14 constitutes a battery pack 10 together with a battery 12 and a protector 16. The battery measuring IC chip 14 is electrically connected to the battery 12 to be connected to the battery 12 so that various conditions such as temperature, volume, voltage, and current of the battery 12 can be measured. In addition, the battery measuring IC chip 14 is also connected to the CPU 26 in the portable electronic device 20 so that signals measured in relation to the battery 12 are supplied to the CPU 26. The CPU 26 of the portable electronic device 20 connected with the battery measuring IC chip 14 issues a measurement command to the battery measuring IC chip 14 according to the procedure of the program stored in the program memory 24. The residual charge amount of the battery 12 is calculated based on the measured signals of. Based on the calculated remaining charge amount of the battery 12, the CPU 26 controls to start or end the charging operation of the charger 22. In the charging operation of the charger 22, the protector 16 in the battery pack 10 protects the measuring IC chip 14 and the battery 12 from excessive voltage from the charger 22, and also from the charger 22. The battery 12 can accumulate electric charge by the charging voltage of.

As described above, in the method of measuring the residual charge of the battery using the battery measuring IC chip, the battery measuring IC chip merely detects and transfers the voltage, current, volume, and temperature of the battery, and thus uses the battery body. The program load was inevitably added to the CPU 26 in the unit (ie, portable electronic device). As a result, the performance of the main body (ie, portable electronic device) using the battery pack is inevitably deteriorated.

Accordingly, an object of the present invention is to provide a battery measuring circuit suitable for improving the performance of a portable electronic device in which the battery is to be used and a control method thereof.

Another object of the present invention is to provide a battery measuring circuit suitable for reducing the program load of a portable electronic device in which a battery is to be used and a control method thereof.

Battery measuring circuit according to an embodiment of the present invention for achieving the above object is a detector for detecting the discharge voltage, discharge current, volume and temperature of the battery; A repeater for relaying data communication with an electronic device to use a battery; And calculating information related to the remaining battery capacity based on the voltage, current, volume, and temperature sensed by the detector, and transmitting a data packet requesting the electronic device to perform an operation via a repeater depending on the calculated information. And a control unit for transmitting a data packet including the battery level related information to the electronic device in response to the data packet received from the electronic device via the repeater.

The control unit is configured to calculate the battery level related information, request to perform an operation on the electronic device, and the electronic device, depending on a program memory for storing a program related to the measurement and communication related to the remaining battery level and the program stored in the program memory. And a processor for transmitting the data packet responsive to the data packet from the.

The controller may perform calculation of the remaining battery power related information based on the detection signal at regular intervals depending on the interrupt signal provided from the interrupt generator.

In addition, the control unit monitors a change in the state of the battery based on the measured battery remaining amount related information, and further performs an operation to notify the electronic device of the changed state of the battery.

The data packet to be transmitted to the electronic device includes a remaining amount of the identification battery having a unique address, and a message.

The data packet may further include a mode bit indicating a type of data to be included in a message and a display format of the battery remaining amount.

According to another aspect of the present invention, there is provided a method of controlling a battery measuring circuit, the method including calculating information regarding a remaining battery level based on a voltage, a current volume, and a temperature sensed by a detector; Monitoring whether it is necessary to send a message to an electronic device in which the battery is to be used depending on the calculated information; When the transmission of the message is required, causing a data packet containing the message together with the remaining amount of data to be sent towards the electronic device; Waiting for a data packet containing an instruction from the electronic device to be received; And causing the data packet including the battery remaining amount to be transmitted to the electronic device in response to the data packet from the electronic device.

The message includes one of data for requesting an electronic device to perform an operation and data related to a change in the state of the battery.

The data packet to be sent toward the electronic device includes an identification code having the unique address, the remaining battery capacity and a message.

Furthermore, the data packet may further include a mode bit indicating a type of data to be included in the message and a display format of the battery remaining amount.

According to another aspect of the present disclosure, a method of controlling a battery measurement circuit may include: setting a measurement mode of the battery by a command included in a data packet from an electronic device in which the battery is to be used; Calculating information regarding the remaining amount of the battery based on the voltage, current, volume, and temperature sensed by the detector at regular intervals; Monitoring whether it is necessary to send a message to an electronic device in which the battery is to be used depending on the calculated information; When the transmission of the message is required, causing a data packet containing the message together with the remaining amount of data to be sent towards the electronic device; Waiting for a data packet containing an instruction from the electronic device to be received; And in response to the command included in the data packet from the electronic device, one of transmitting the data packet including the battery level to the electronic device and releasing the measurement mode.

The message includes one of data for requesting an electronic device to perform an operation and data related to a change in the state of the battery.

The data packet to be transmitted toward the electronic device has an identification code having a unique address, a remaining battery level and a message.

The data packet may further include a mode bit indicating a type of data to be included in a message and a display format of the battery remaining amount.

With the above configuration, the battery measuring circuit and the control method thereof according to the present invention can reduce the program load of the electronic device in which the battery is to be used, and further improve the performance of the electronic device.

In addition to the objects of the present invention as described above, other objects, other advantages and other features of the present invention will become apparent from the detailed description of the preferred embodiment with reference to the accompanying drawings.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 schematically illustrates a battery measuring circuit according to a preferred embodiment of the present invention. Referring to FIG. 3, a battery measuring circuit according to an exemplary embodiment of the present invention may include a detector 140, a program memory 142, a working memory 144, an interrupt generator 146, and the like, which are commonly connected to the processor 150. A repeater 148.

Detector 140 includes sensing sensors electrically connected to a battery (not shown) or sensing sensors disposed in contact with or in proximity with the battery, such that the voltage, current, temperature and The volume and the like are supplied to the processor 150. Since the detector 140 is already disclosed in the existing battery measuring circuit, a detailed description thereof will be omitted.

The program memory 142 allows the processor 150 to calculate the remaining charge amount of the battery and the total possible discharge capacity (or total charge capacity) associated therewith, the total possible discharge period, the remaining discharge period, the remaining charge period, and the like. It stores programs about a series of processes that allow communication with portable electronic devices. As the program memory 142, a nonvolatile memory, for example, an EEPROM, an SRAM, or the like, which can retain a program even when power is not supplied, is used.

The working memory 144 may store temporary data generated during arithmetic operations of the processor 150, messages to be received or transmitted in communication with the portable electronic device, remaining battery power, and detection signals detected by the detector 140. Temporarily preserve For this purpose, a random access memory capable of updating data is used as the working memory 144.

The interrupt generator 146 generates an interrupt (ie, a time interrupt) whenever a certain period of time has elapsed. For this purpose, the interrupt generator 146 includes a timer that can count a certain period of time. The interrupt signal generated by the interrupt generator 146 is applied to the processor 150 to cause the processor 150 to execute a task in a preset mode.

The repeater 148 relays bidirectional communication between the processor 150 and a portable electronic device driven by a battery. To this end, the repeater 148 is connected to the portable electronic device using the battery by the connection cable 141. The connection cable 141 includes a 1-bit transmission line that allows data packets to be transmitted in a serial manner.

The processor 150 measures the remaining battery-related information of the battery, transfers the measured information to the portable electronic device, and starts and ends charging based on the measured information according to a program such as the flowchart of FIG. 4 stored in the program memory 142. Requests for performance of the operation and notification of the battery's state (or condition). First, the processor 150 accesses the repeater 148 and checks whether there is a data packet transmitted from the CPU of the portable electronic device connected to the repeater 148 by the connection cable 141. When there is a received data packet, in response to the message included in the data packet, the processor 150 determines whether the measured battery level and status information or operation request message is added to the identification information or the identification information and the information bit. A data packet such as 3b is transmitted to the CPU of the portable electronic device via the repeater 148 and the connection cable 141. Alternatively, the processor 150 may set and release a measurement mode for the remaining battery level in response to a message of a data packet from the portable electronic device. When the measurement mode is set, the processor 150 periodically inputs various condition detection signals including the discharge current, the discharge voltage, the temperature and the volume of the battery from the detector 140 and based on the input detection signals. The remaining charge of the battery, the remaining discharge time, the remaining charge time, the total possible charge capacity (or the total possible discharge capacity), the total possible discharge time, etc. are calculated. In addition, the processor 150 may, based on the amount of charge remaining in the battery, determine whether or not a request for performing an operation such as termination of charging or initiation of charging is necessary and battery conditions such as a change in the total possible charge capacity and the possible total discharge duration. Determine the need for notification of status). When a request to perform an operation or notification of a battery condition is required, the processor 150 adds an operation execution request message or a battery condition message to the identification code or identification code and mode bits, as shown in FIG. 3A or 3B. The data packet as described above is transmitted to the CPU of the portable electronic device via the repeater 148 and the connection cable 141. Contrary to what is disclosed as being carried out at regular intervals, such a battery remaining measurement can also be programmed to monitor-measure the battery remaining. In this case, the discharge period of the residual charge amount of the battery by the battery measuring circuit can be severely shortened. In addition, the measurement mode may be set by the manufacturer, as opposed to being set and released depending on the instructions from the portable electronic device. In this case, the battery measuring circuit can deepen the discharge of the residual charge amount of the battery.

Thus, the battery measurement circuit according to an embodiment of the present invention measures the remaining battery-related information and requests to perform necessary operations such as the start and end of charging as well as the transmission of the measured information. Accordingly, the battery measuring circuit according to an embodiment of the present invention can reduce the program load of the portable electronic device as well as improve the performance of the portable electronic device.

FIG. 3A illustrates the format of a data packet transmitted toward the portable electronic device to be connected to the connection cable 141 in the battery circuit of FIG. 2. The data packet of FIG. 3A is Includes the message and battery level, placed next to the identification code. Identification code is portable And a unique address of a battery measurement integrated circuit chip that can be recognized as one of the peripheral circuits of the electronic device. The message may include a request to perform an operation such as termination or initiation of charging, or a condition of the battery such as the total possible charge capacity of the battery (the total possible discharge capacity) or the total possible discharge period of the battery. The battery level may include remaining data in bar graph form or remaining data in percentage form.

3B illustrates the format of another embodiment of a data packet to be transmitted from the battery measurement circuit of FIG. 2 toward the portable electronic device. The data packet of FIG. 3B further includes a mode bit disposed between the identifier and the message as compared to that of FIG. 3A. This mode bit specifies the type of data to be included in the message and how the battery level is represented. For example, if the mode bit has a value of "0", the message includes data relating to the condition of the battery and the battery remaining data in the form of a bar graph. Alternatively, if the mode bit has a value of " 1 ", the message includes a request command requesting the portable electronic device to execute the operation and the remaining battery power as a percentage.

4 is a flowchart illustrating a step-by-step control method of a battery measurement circuit according to an exemplary embodiment of the present invention. The control method of the battery measuring circuit of FIG. 4 is performed by the processor 150 included in the battery measuring circuit of FIG. 2. Thus, the flowchart of FIG. 4 will be described in detail in conjunction with the battery measurement circuit shown in FIG.

The processor 150 accesses the repeater 148 to check whether there is a data packet transmitted from a portable electronic device (not shown) connected to the repeater 148 by the connection cable 141 (step S10). If there is no data packet from the portable electronic device in step S10, the processor 150 considers that there is no communication request or command transmission, that is, polling, by the portable electronic device. The processor 150 checks whether an interrupt signal is input from the interrupt generator 146 (step S12). In this case, if no interrupt signal is generated in the interrupt generator 146, the processor 150 returns to step S10.

If there is polling in step S10, the processor 150 may include an identification code included in the data packet received via the connection cable 141 and the repeater 148 as its own identification code (ie, a unique address assigned to it). (S14). In other words, the processor 150 determines whether it is called by the portable electronic device based on the identification code included in the data packet. At this time, if the identification code of the data packet does not match its own identification code (i.e. its own address), the processor 150 assumes that it is not called and returns to step S10. In contrast, if the identification code of the data packet matches its identification code, the processor 150 receives the message included in the data packet and temporarily stores the message in the working memory 144 (step S16). Subsequently, the processor 150 decrypts the message stored in the working memory 144 and checks whether the message designates a setting or a release of the measurement mode to periodically measure the remaining charge of the battery (step S18). If the message received in step S18 is not a command for specifying the setting or release of the measurement mode, the processor 150 checks whether the received message is an information request command requesting the transfer of the remaining charge amount of the battery and information related thereto. (Step S20). At this time, if the received message is neither a designation command nor an information request command for setting or releasing the measurement mode, the processor 150 returns to step S10.

If the message received in step S18 includes a designation command for setting or releasing the measurement mode, the processor 150 sets the remaining amount measurement mode flag assigned to any one of the registers in itself to " 1 " Reset to "0" to set or cancel the remaining amount measurement mode (step S22). The setting and release of this measurement mode depends on the command of the portable electronic device in which the battery is to be used, thereby minimizing the consumption of the residual charge amount at the discharge end.

 In addition, if the message received in step S20 includes an information request command, the processor 150 may add a message about the state of the battery stored in the working memory 144 and the remaining charge of the battery to its identification code. Form a data packet as shown in 3a. The processor 150 transmits the formed data packet to the portable electronic device via the repeater 148 and the connection cable 141 (step S24). After performing step S22 or step S24, the processor 150 returns to step S10. Here, the data packet formed by the processor 150 may be formed in the form of a data format as shown in FIG. 3B instead of the data format as shown in FIG. 3A.

On the other hand, if the time interrupt is generated by the interrupt generator 146 in step S12, the processor 150 checks whether the information sending mode is based on the value of the information sending mode flag assigned to any one of the registers in the self (see FIG. Step S26). At this time, if the information sending mode flag is reset to " 0 ", the processor 150 assumes that the information sending mode is not the information sending mode and is based on the value of the measurement mode flag assigned to any one of the registers in the processor. The authorization is checked (step S28). If the measurement mode flag is reset to " 0 ", the processor 150 assumes that it is not in the remaining measurement mode. If the information transmission mode or the remaining amount measurement mode is not performed in steps S26 and S28, the processor 150 returns to step S10.

If the measurement mode flag is set to "1" in step S28, the processor 150 considers the remaining power measurement mode to input a detection signal for the voltage, current, temperature and volume of the battery from the detector 140, and The input detection signals are stored in the working memory 144 (step S30). By using the detection signal stored in the working memory 144, the processor 150 is related to the remaining battery life such as remaining battery, remaining discharge period, remaining charge period, the total possible charge capacity (total discharge capacity possible) and the total discharge period possible The information is calculated (step S32), and the calculated remaining amount related information of the battery is stored in the working memory 144 (step S34). Subsequently, the processor 150 checks the calculated battery level related information and checks whether the battery level related information needs to be transmitted to the portable electronic device (step S36). Specifically, the processor is required to charge the battery when the remaining charge of the battery remains low and needs to be charged, when the charge is completed (full charged) and requires termination of the charge, or the total possible battery charge. Information transfer is necessary when the charge capacity (or total discharge capacity) and the total discharge duration are changed so that the portable electronic device should be informed of the changed total charge capacity (or total discharge capacity) and the total discharge duration. To judge. If it is determined in step S36 that transmission of the remaining battery level related information is necessary, the processor 150 sets the information sending mode by setting the information sending mode flag to "1" (step S38). After the execution of step S38 or when it is not necessary to send the remaining battery level related information in step S36, the processor 150 returns to step S10.

In addition, when the information transmission mode flag is set to "1" in step S26, the processor 150 considers that there is a change in the state (or condition) of the battery or that a request for performing an operation is required in the portable electronic device. In addition, the processor 150 may add the state (or condition) data of the battery stored in the working memory 144 or the data for performing the operation and the data about the remaining amount of the battery to the identification code or the identification code and the mode bit. A data packet as shown in 3b is generated and the generated data packet is transmitted to the portable electronic device via the repeater 148 and the connection cable 141 (step S40). Subsequently, the processor 150 resets the information transmission mode flag of the value "1" set in step S38 to "0" to cancel the information transmission mode (step S42). After performing step S40, the processor 150 returns to step S10.

As described above, the battery measuring circuit control method according to an exemplary embodiment of the present disclosure may transmit information regarding the remaining amount of the battery or enter a battery measurement mode in response to a request of the portable electronic device. Here, the entry of the battery into the measurement mode may be programmed by the manufacturer unconditionally if there is a residual charge amount in the battery regardless of the request of the portable electronic device. In addition, the battery measuring circuit control method according to an embodiment of the present invention, the need for performing the operation, such as the end of charging the battery or the start of charging the battery or the total charge capacity of the battery based on the remaining battery capacity in the calculation of the remaining battery-related information (Or the total possible discharge capacity) and the change in the state (or condition) of the battery, such as a change in the total possible discharge period, so as to request the portable electronic device to perform such an operation on the portable electronic device or to change the state of the battery. You can notify your teller. In addition, in the method of controlling a battery circuit according to an exemplary embodiment of the present disclosure, the battery remaining amount measurement may be programmed in such a manner that the remaining amount of the battery is always monitored and measured, unlike that the remaining amount of the battery is measured to be performed at regular intervals. In this case, the discharge period of the residual charge amount of the battery by the battery measuring circuit can be severely shortened.

Thus, in the battery measuring circuit control method according to an embodiment of the present invention, the battery measuring circuit to measure the battery-related information of the battery remaining, and to request the performance of the necessary operations such as the start and end of charging as well as the transmission of the measured information. . Accordingly, the method for controlling the battery measurement circuit according to the embodiment of the present invention can reduce the program load of the portable electronic device as well as improve the performance of the portable electronic device.

As described above, in the battery measuring circuit and control method thereof according to the present invention, the remaining battery-related information is measured and transmitted to the portable electronic device in which the battery is used, as well as the start and end of the charging based on the measured information. The same necessary action is performed by the portable electronic device. Accordingly, in the battery measuring circuit and the control method according to an embodiment of the present invention, the program load of the portable electronic device can be reduced, as well as the performance of the portable electronic device is improved.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary, and a person of ordinary skill in the art without departing from the spirit and scope of the present invention. It will be apparent that various modifications, changes, and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (14)

In the battery measurement circuit constituting the pack integrated with the battery, A detector for sensing the discharge voltage, current, and temperature of the battery; A repeater for relaying data communication with the electronic device to use the battery; And Calculates information related to the remaining amount of the battery based on the voltage, current, and temperature sensed by the detector, and sends a data packet requesting the electronic device to perform an operation via the repeater depending on the calculated information. And a control unit which transmits the data packet including the battery level related information to the electronic device in response to the data packet received from the electronic device via the repeater. The method of claim 1, wherein the control unit, A program memory for storing a program related to the battery level related measurement and communication; And And a processor configured to perform calculation of the battery level related information, request to perform an operation on the electronic device, and transmission of a data packet in response to the data packet from the electronic device, depending on the program stored in the program memory. Battery measuring circuit, characterized in that. The method of claim 2, And an interrupt generator for providing an interrupt signal to the controller so that the controller performs calculation of information based on the detection signal at regular intervals. The method of claim 1, wherein the control unit, And monitoring the change of the state of the battery based on the measured battery remaining quantity related information, and performing the operation of notifying the changed state of the battery toward the electronic device. The method of claim 4, wherein the data packet to be transmitted toward the electronic device, An identification code containing the unique address; The remaining amount of the battery; And A battery measuring circuit comprising said message. The method of claim 5, wherein the data packet, And a mode bit indicating a type of data to be included in the message and a display format of the battery remaining amount. A method of controlling a battery measurement circuit comprising a detector for sensing a discharge voltage, current and temperature of a battery and constituting a pack integrated with the battery, the method comprising: Calculating information regarding the remaining amount of the battery based on the voltage, current, and temperature sensed by the detector; Monitoring whether the battery needs to be sent to an electronic device to be used depending on the calculated information; When the transmission of the message is required, causing a data packet containing the message along with the remaining amount of data to be sent towards the electronic device; Waiting for a data packet containing a command from the electronic device to be received; And And causing a data packet including the battery remaining amount to be transmitted to the electronic device in response to the data packet from the electronic device. The method of claim 7, wherein the message, And any one of data for requesting the electronic device to perform an operation and data related to a change in the state of the battery. The method of claim 8, wherein the data packet to be transmitted toward the electronic device, An identification code containing the unique address; The remaining amount of the battery; And And a message as described above. The method of claim 9, wherein the data packet, And a mode bit indicating a type of data to be included in the message and a display format of the battery remaining amount. A method of controlling a battery measurement circuit comprising a detector for sensing a discharge voltage, current and temperature of a battery and constituting a pack integrated with the battery, the method comprising: Setting a measurement mode of the battery by a command included in a data packet from an electronic device in which the battery is to be used; Calculating information regarding the remaining amount of the battery based on the voltage, current, and temperature sensed by the detector at regular intervals; Monitoring whether the battery needs to be sent to an electronic device to be used depending on the calculated information; When the transmission of the message is required, causing a data packet containing the message along with the remaining amount of data to be sent towards the electronic device; Waiting for a data packet containing a command from the electronic device to be received; And In response to a command included in the data packet from the electronic device, causing one of the transmission of the data packet including the battery level to the electronic device and the release of the measurement mode to be performed. Control method of a battery measurement circuit. The method of claim 11, wherein the message, And any one of data for requesting the electronic device to perform an operation and data related to a change in the state of the battery. The method of claim 12, wherein the data packet to be transmitted toward the electronic device, An identification code containing the unique address; The remaining amount of the battery; And And a message as described above. The method of claim 13, wherein the data packet, And a mode bit indicating a type of data to be included in the message and a display format of the battery remaining amount.

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