well, with the effectiveness of services to defend the interests of the masses. Third, we should strive to do well. To achieve good practical results, the key is to know the law, to grasp the laws and using laws. Office of economic development, social progress, there are rules to follow. Only act according to the law, to overcome blindness and strengthening initiative, creative. Working in the Office, we should be good at analyzing the essence of things, to find regular thing, change from passive to active, to seek one. Investee 2. establishment of evaluation system. Evaluation system is essentially an incentive mechanism, the evaluation was objective and fair, reasonable, and can stimulate a person's energy, mobilizing people's enthusiasm or be misleading, dampened the enthusiasm of people. At present, the concept of people-oriented people, but to establish and perfect evaluation system is still lagging behind. Work in this area should be seriously caught up. \phasis on\of. Is a focus on standards and scientific. A fundamental point of the evaluation criteria, is to keep contact, development, comprehensive eye evaluation of cadres. Office work, both \ntial performance\both subjective efforts, take another look at the objective condition; both \nother look at the \cond, focus on participating the breadth of the subject. Evaluation of cadres must give full play to democracy, cadres and the masses handing over evaluation. Office work services leadership and service base, serve the people, then nominated the main object will contain a variety of services, so that assessment was accurate and to avoid one-sidedness. Third, pay attention to the seriousness of the conclusion. The use of evaluation findings is mainly embodied in his direction. Permitted to choose one, it would be tantamount to establishing a banner. Evaluation can't take care of the balance, otherwise it would undermine the offset thepositive significance of evaluation. Office of the party committees at all levels should take the findings as on the cadres ' bonus-penalty, an important basis for future movements, incentive and restraint effect of making evaluations. 3. Prevention of understanding \d development, concrete is dialectical,. In practice in the process, to prevent one-sided and still look, from actual people. One is to use dialectical point of view to understand. Humanist is the core of the scientific Outlook on development, remains the development of the scientific Outlook on development emphasizes, is still taking economic construction as the Center. Any departure from the development of thought and action, is a misinterpretation and misunderstanding of people-oriented. Adhere to people-oriented both to overcome one-sidedness of the old, but also to prevent one-sidedness, not accelerating the development of people and the opposition. Must be very clear, people oriented and speeding up development is not opposed, but consistent, we should never be介绍了高精度电能计量芯片ATT7022的主要功能、性能比较、内部结构、接口方式及校表方法等，同时对ATT7022在电能配电监控终端的应用作了简要阐述。
关键词：SPI总线 ATT7022 电能计量 W77E58 配电监控终端
1 概述
ATT7022是珠海炬力集成电路设计有限公司生产的一款高精度三相电能计量芯片，该芯片对有功、无功功率的测量精度分别达到0.2s和0.5s，所能测量的电参数包括有功、无功、视在功率、双向有功和四角限无功电能；电压和电流有效值；相位、频率等。ATT7022具有计量参数齐全、校表功率完善等优点，简化了软件设计，缩短了软件开发周期。特别是AT7022可支持全数字校表，即软件校表。软件校表可提高校表精度、简化硬件设计、降低设计成本，为三相多功能计量装置提供了功能更加齐全、设计更加简单的应用方案。表1和表2分别给出了三大计量芯片生产商的三相电能计量芯片计量参数校表参数的比较。
表1 三相电能计量芯片的主要电能测量参数比较
珠海炬力ATT7022 电能参数 分相 合相 ADI ADE7754 SAMEs SA9904B 分相 合相 分相 合相 电压有效值 √ — √ — √ — 电流有效值 √ √ √ × × × 视在功率 √ √ × √ √ × 有功功率 √ √ × √ √ × 容性无功功率 √ √ × × × × 感性无功功率 √ √ × × × × 功率因素 √ √ × × × × 线频率 √ √ √ √ √ √ 输入有功能量 √ √ × × × × 输出有功能量 √ √ × × × × 有功能量 √ √ × × × × 容性无功能量 √ √ × × × × 感性无功能量 √ √ × × × × 无功能量 √ √ × × × × eople-oriented in the name of reducing our enthusiasm. Premier Wen Jiabao's Government work report this year, identified as 7% growth, 2.1% lower than last year's 9.1%, but in 8 work remains to accelerate development in the first place ... Work standards. Second is to use the scale of development to understand. Society is evolving, human needs are also changing. Practice of humanism is a long-term process and cannot be achieved overnight. To treat people if you stand still and rigid dogma, it is possible to return to this, see things but not people's old ways. Therefore, we have to follow the development of the times, and continue debugging the humanist perspective, innovative people-oriented way. Under the new historical conditions, we are requested by the times, set up a brand new concept, a high starting point, high standard of armed people, shaping, exercise, people, constantly taking the new connotation of the times. erms of Office, is to lead the vast numbers of cadres to activelyadapt to the knowledge faster and actively adapt to the increasingly high level of leadership situation, actively adapt to the demand of the masses more and more situations, eager to learn, enhance accumulation, efforts, honed the ability to overcome a good service, panic. Third is to use realistic understanding. Adhere to people-oriented must be based on reality, not divorced from reality. Desk no water cups here in Hong Kong, staff need to drink some water to the drinking fountain on a floor, the glass used is a one-time non-cone type. Drink this cup can only hold, cannot be put down. This is not only to save on glass materials, more important is to force you to get drinking water, go back to your seat business. Our emphasis on people-oriented, does not imply you can indulge the desires, the comfortable, the pursuit of enjoyment. Office of the party committees at all levels of our comrades, must continue to maintain the style of plain living and hard struggle, to stand up to the tests oftemptations, exciting \he spirit of selfless dedication and provide services. Investee 4. clearly defined responsibilities. Putting people first is a common vision of development, everyone is a liability. People-oriented, above and below with the responsibility for coordinating system must be established and hold everyone accountable. First, we must strengthen the leadership. \ce, its governance, its level, bear the responsibility of the Division.\s is the minimum requirement for leaders, is a measure of the basic criteria for whether a leading cadre is competent. Leaders need to \n official term for the benefit of\ously assume responsibility for implementing people-oriented. Director of the Office of the party committees at all levels is the responsibility of the units to implement people-oriented, to manage their people, %ug in own responsibility\nhance the education of leading cadres, cadres and cadres workefforts to revitalize the Office of human resources, Office work is full of vigor and vitalitywell, with the effectiveness of services to defend the interests of the masses. Third, we should strive to do well. To achieve good practical results, the key is to know the law, to grasp the laws and using laws. Office of economic development, social progress, there are rules to follow. Only act according to the law, to overcome blindness and strengthening initiative, creative. Working in the Office, we should be good at analyzing the essence of things, to find regular thing, change from passive to active, to seek one. Investee 2. establishment of evaluation system. Evaluation system is essentially an incentive mechanism, the evaluation was objective and fair, reasonable, and can stimulate a person's energy, mobilizing people's enthusiasm or be misleading, dampened the enthusiasm of people. At present, the concept of people-oriented people, but to establish and perfect evaluation system is still lagging behind. Work in this area should be seriously caught up. \phasis on\of. Is a focus on standards and scientific. A fundamental point of the evaluation criteria, is to keep contact, development, comprehensive eye evaluation of cadres. Office work, both \ntial performance\both subjective efforts, take another look at the objective condition; both \nother look at the \cond, focus on participating the breadth of the subject. Evaluation of cadres must give full play to democracy, cadres and the masses handing over evaluation. Office work services leadership and service base, serve the people, then nominated the main object will contain a variety of services, so that assessment was accurate and to avoid one-sidedness. Third, pay attention to the seriousness of the conclusion. The use of evaluation findings is mainly embodied in his direction. Permitted to choose one, it would be tantamount to establishing a banner. Evaluation can't take care of the balance, otherwise it would undermine the offset thepositive significance of evaluation. Office of the party committees at all levels should take the findings as on the cadres ' bonus-penalty, an important basis for future movements, incentive and restraint effect of making evaluations. 3. Prevention of understanding \d development, concrete is dialectical,. In practice in the process, to prevent one-sided and still look, from actual people. One is to use dialectical point of view to understand. Humanist is the core of the scientific Outlook on development, remains the development of the scientific Outlook on development emphasizes, is still taking economic construction as the Center. Any departure from the development of thought and action, is a misinterpretation and misunderstanding of people-oriented. Adhere to people-oriented both to overcome one-sidedness of the old, but also to prevent one-sidedness, not accelerating the development of people and the opposition. Must be very clear, people oriented and speeding up development is not opposed, but consistent, we should never be注：“√”表示支持，“×”表示不支持，“—”表示无此参数 表2 三相电能计量芯片的主要校表参数比较
珠海炬力ATT7022 电能参数 分相 ADI ADE7754 SAMEs SA9904B 2 合相 分相 有功功率增益校正 √ √ × 视在功率增益校正 √ √ × 相位校正 √ √ × 电压有效值校正 √ √ × 电流有效值校正 √ √ × 脉冲输出参数校正 √ 1 × × 启动电流设置 √ × × 注：“√”表示支持，“×”表示不支持，“1”表示合相时的参数，“2”表示该芯片不支持软件校表
eople-oriented in the name of reducing our enthusiasm. Premier Wen Jiabao's Government work report this year, identified as 7% growth, 2.1% lower than last year's 9.1%, but in 8 work remains to accelerate development in the first place ... Work standards. Second is to use the scale of development to understand. Society is evolving, human needs are also changing. Practice of humanism is a long-term process and cannot be achieved overnight. To treat people if you stand still and rigid dogma, it is possible to return to this, see things but not people's old ways. Therefore, we have to follow the development of the times, and continue debugging the humanist perspective, innovative people-oriented way. Under the new historical conditions, we are requested by the times, set up a brand new concept, a high starting point, high standard of armed people, shaping, exercise, people, constantly taking the new connotation of the times. erms of Office, is to lead the vast numbers of cadres to activelyadapt to the knowledge faster and actively adapt to the increasingly high level of leadership situation, actively adapt to the demand of the masses more and more situations, eager to learn, enhance accumulation, efforts, honed the ability to overcome a good service, panic. Third is to use realistic understanding. Adhere to people-oriented must be based on reality, not divorced from reality. Desk no water cups here in Hong Kong, staff need to drink some water to the drinking fountain on a floor, the glass used is a one-time non-cone type. Drink this cup can only hold, cannot be put down. This is not only to save on glass materials, more important is to force you to get drinking water, go back to your seat business. Our emphasis on people-oriented, does not imply you can indulge the desires, the comfortable, the pursuit of enjoyment. Office of the party committees at all levels of our comrades, must continue to maintain the style of plain living and hard struggle, to stand up to the tests oftemptations, exciting \he spirit of selfless dedication and provide services. Investee 4. clearly defined responsibilities. Putting people first is a common vision of development, everyone is a liability. People-oriented, above and below with the responsibility for coordinating system must be established and hold everyone accountable. First, we must strengthen the leadership. \ce, its governance, its level, bear the responsibility of the Division.\s is the minimum requirement for leaders, is a measure of the basic criteria for whether a leading cadre is competent. Leaders need to \n official term for the benefit of\ously assume responsibility for implementing people-oriented. Director of the Office of the party committees at all levels is the responsibility of the units to implement people-oriented, to manage their people, %ug in own responsibility\nhance the education of leading cadres, cadres and cadres workefforts to revitalize the Office of human resources, Office work is full of vigor and vitalitywell, with the effectiveness of services to defend the interests of the masses. Third, we should strive to do well. To achieve good practical results, the key is to know the law, to grasp the laws and using laws. Office of economic development, social progress, there are rules to follow. Only act according to the law, to overcome blindness and strengthening initiative, creative. Working in the Office, we should be good at analyzing the essence of things, to find regular thing, change from passive to active, to seek one. Investee 2. establishment of evaluation system. Evaluation system is essentially an incentive mechanism, the evaluation was objective and fair, reasonable, and can stimulate a person's energy, mobilizing people's enthusiasm or be misleading, dampened the enthusiasm of people. At present, the concept of people-oriented people, but to establish and perfect evaluation system is still lagging behind. Work in this area should be seriously caught up. \phasis on\of. Is a focus on standards and scientific. A fundamental point of the evaluation criteria, is to keep contact, development, comprehensive eye evaluation of cadres. Office work, both \ntial performance\both subjective efforts, take another look at the objective condition; both \nother look at the \cond, focus on participating the breadth of the subject. Evaluation of cadres must give full play to democracy, cadres and the masses handing over evaluation. Office work services leadership and service base, serve the people, then nominated the main object will contain a variety of services, so that assessment was accurate and to avoid one-sidedness. Third, pay attention to the seriousness of the conclusion. The use of evaluation findings is mainly embodied in his direction. Permitted to choose one, it would be tantamount to establishing a banner. Evaluation can't take care of the balance, otherwise it would undermine the offset thepositive significance of evaluation. Office of the party committees at all levels should take the findings as on the cadres ' bonus-penalty, an important basis for future movements, incentive and restraint effect of making evaluations. 3. Prevention of understanding \d development, concrete is dialectical,. In practice in the process, to prevent one-sided and still look, from actual people. One is to use dialectical point of view to understand. Humanist is the core of the scientific Outlook on development, remains the development of the scientific Outlook on development emphasizes, is still taking economic construction as the Center. Any departure from the development of thought and action, is a misinterpretation and misunderstanding of people-oriented. Adhere to people-oriented both to overcome one-sidedness of the old, but also to prevent one-sidedness, not accelerating the development of people and the opposition. Must be very clear, people oriented and speeding up development is not opposed, but consistent, we should never be
2 引脚功能
ATT7022的引脚排列如图1所示，它采用44引脚QFP封装，面积仅有10mm×10mm，功耗仅为100～200mW，各引脚功能如下：
·V1P/V1N，V3P/V3N，V5P/V5N：模拟电流信号输入； ·V2P/V2N，V4P/V4N，V6P/V6N：模拟电压信号输入； ·REEOUT、REFCAP：基准电压输出； ·RESET：复位输入端；
·SIG：写操作成功握手信号输出；
eople-oriented in the name of reducing our enthusiasm. Premier Wen Jiabao's Government work report this year, identified as 7% growth, 2.1% lower than last year's 9.1%, but in 8 work remains to accelerate development in the first place ... Work standards. Second is to use the scale of development to understand. Society is evolving, human needs are also changing. Practice of humanism is a long-term process and cannot be achieved overnight. To treat people if you stand still and rigid dogma, it is possible to return to this, see things but not people's old ways. Therefore, we have to follow the development of the times, and continue debugging the humanist perspective, innovative people-oriented way. Under the new historical conditions, we are requested by the times, set up a brand new concept, a high starting point, high standard of armed people, shaping, exercise, people, constantly taking the new connotation of the times. erms of Office, is to lead the vast numbers of cadres to activelyadapt to the knowledge faster and actively adapt to the increasingly high level of leadership situation, actively adapt to the demand of the masses more and more situations, eager to learn, enhance accumulation, efforts, honed the ability to overcome a good service, panic. Third is to use realistic understanding. Adhere to people-oriented must be based on reality, not divorced from reality. Desk no water cups here in Hong Kong, staff need to drink some water to the drinking fountain on a floor, the glass used is a one-time non-cone type. Drink this cup can only hold, cannot be put down. This is not only to save on glass materials, more important is to force you to get drinking water, go back to your seat business. Our emphasis on people-oriented, does not imply you can indulge the desires, the comfortable, the pursuit of enjoyment. Office of the party committees at all levels of our comrades, mustcontinue to maintain the style of plain living and hard struggle, to stand up to the tests oftemptations, exciting \he spirit of selfless dedication and provide services. Investee 4. clearly defined responsibilities. Putting people first is a common vision of development, everyone is a liability. People-oriented, above and below with the responsibility for coordinating system must be established and hold everyone accountable. First, we must strengthen the leadership. \ce, its governance, its level, bear the responsibility of the Division.\s is the minimum requirement for leaders, is a measure of the basic criteria for whether a leading cadre is competent. Leaders need to \n official term for the benefit of\ously assume responsibility for implementing people-oriented. Director of the Office of the party committees at all levels is the responsibility of the units to implement people-oriented, to manage their people, %ug in own responsibility\nhance the education of leading cadres, cadres and cadres workefforts to revitalize the Office of human resources, Office work is full of vigor and vitalitywell, with the effectiveness of services to defend the interests of the masses. Third, we should strive to do well. To achieve good practical results, the key is to know the law, to grasp the laws and using laws. Office of economic development, social progress, there are rules to follow. Only act according to the law, to overcome blindness and strengthening initiative, creative. Working in the Office, we should be good at analyzing the essence of things, to find regular thing, change from passive to active, to seek one. Investee 2. establishment of evaluation system. Evaluation system is essentially an incentive mechanism, the evaluation was objective and fair, reasonable, and can stimulate a person's energy, mobilizing people's enthusiasm or be misleading, dampened the enthusiasm of people. At present, the concept of people-oriented people, but to establish and perfect evaluation system is still lagging behind. Work in this area should be seriously caught up. \phasis on\of. Is a focus on standards and scientific. A fundamental point of the evaluation criteria, is to keep contact, development, comprehensive eye evaluation of cadres. Office work, both \ntial performance\both subjective efforts, take another look at the objective condition; both \nother look at the \cond, focus on participating the breadth of the subject. Evaluation of cadres must give full play to democracy, cadres and the masses handing over evaluation. Office work services leadership and service base, serve the people, then nominated the main object will contain a variety of services, so that assessment was accurate and to avoid one-sidedness. Third, pay attention to the seriousness of the conclusion. The use of evaluation findings is mainly embodied in his direction. Permitted to choose one, it would be tantamount to establishing a banner. Evaluation can't take care of the balance, otherwise it would undermine the offset thepositive significance of evaluation. Office of the party committees at all levels should take the findings as on the cadres ' bonus-penalty, an important basis for future movements, incentive and restraint effect of making evaluations. 3. Prevention of understanding \d development, concrete is dialectical,. In practice in the process, to prevent one-sided and still look, from actual people. One is to use dialectical point of view to understand. Humanist is the core of the scientific Outlook on development, remains the development of the scientific Outlook on development emphasizes, is still taking economic construction as the Center. Any departure from the development of thought and action, is a misinterpretation and misunderstanding of people-oriented. Adhere to people-oriented both to overcome one-sidedness of the old, but also to prevent one-sidedness, not accelerating the development of people and the opposition. Must be very clear, people oriented and speeding up development is not opposed, but consistent, we should never be·SEL：接线方式选择输入端； ·CF1/CF2：有功/无功电能脉冲输出； ·CS：SPI读/写片选信号； ·SCLK：SPI串行时钟输入；
·DIN/DOUT：SPI串行数据输入/输出；
·Revp：当系统检测到任意相的有功功率为负时，该端输出高电平；各相有功功率均为正时，该端输出低电平；
·OSCI/OSCO：系统晶振输入端/输出端； ·Vcc/Avcc:数字电源/模拟电源； ·GND/AGND：数字地/模拟地。 3 工作原理
3．1 AT7022电能计量芯片的内部结构
eople-oriented in the name of reducing our enthusiasm. Premier Wen Jiabao's Government work report this year, identified as 7% growth, 2.1% lower than last year's 9.1%, but in 8 work remains to accelerate development in the first place ... Work standards. Second is to use the scale of development to understand. Society is evolving, human needs are also changing. Practice of humanism is a long-term process and cannot be achieved overnight. To treat people if you stand still and rigid dogma, it is possible to return to this, see things but not people's old ways. Therefore, we have to follow the development of the times, and continue debugging the humanist perspective, innovative people-oriented way. Under the new historical conditions, we are requested by the times, set up a brand new concept, a high starting point, high standard of armed people, shaping, exercise, people, constantly taking the new connotation of the times. erms of Office, is to lead the vast numbers of cadres to activelyadapt to the knowledge faster and actively adapt to the increasingly high level of leadership situation, actively adapt to the demand of the masses more and more situations, eager to learn, enhance accumulation, efforts, honed the ability to overcome a good service, panic. Third is to use realistic understanding. Adhere to people-oriented must be based on reality, not divorced from reality. Desk no water cups here in Hong Kong, staff need to drink some water to the drinking fountain on a floor, the glass used is a one-time non-cone type. Drink this cup can only hold, cannot be put down. This is not only to save on glass materials, more important is to force you to get drinking water, go back to your seat business. Our emphasis on people-oriented, does not imply you can indulge the desires, the comfortable, the pursuit of enjoyment. Office of the party committees at all levels of our comrades, must continue to maintain the style of plain living and hard struggle, to stand up to the tests oftemptations, exciting \he spirit of selfless dedication and provide services. Investee 4. clearly defined responsibilities. Putting people first is a common vision of development, everyone is a liability. People-oriented, above and below with the responsibility for coordinating system must be established and hold everyone accountable. First, we must strengthen the leadership. \ce, its governance, its level, bear the responsibility of the Division.\s is the minimum requirement for leaders, is a measure of the basic criteria for whether a leading cadre is competent. Leaders need to \n official term for the benefit of\ously assume responsibility for implementing people-oriented. Director of the Office of the party committees at all levels is the responsibility of the units to implement people-oriented, to manage their people, %ug in own responsibility\nhance the education of leading cadres, cadres and cadres workefforts to revitalize the Office of human resources, Office work is full of vigor and vitalitywell, with the effectiveness of services to defend the interests of the masses. Third, we should strive to do well. To achieve good practical results, the key is to know the law, to grasp the laws and using laws. Office of economic development, social progress, there are rules to follow. Only act according to the law, to overcome blindness and strengthening initiative, creative. Working in the Office, we should be good at analyzing the essence of things, to find regular thing, change from passive to active, to seek one. Investee 2. establishment of evaluation system. Evaluation system is essentially an incentive mechanism, the evaluation was objective and fair, reasonable, and can stimulate a person's energy, mobilizing people's enthusiasm or be misleading, dampened the enthusiasm of people. At present, the concept of people-oriented people, but to establish and perfect evaluation system is still lagging behind. Work in this area should be seriously caught up. \phasis on\of. Is a focus on standards and scientific. A fundamental point of the evaluation criteria, is to keep contact, development, comprehensive eye evaluation of cadres. Office work, both \ntial performance\both subjective efforts, take another look at the objective condition; both \nother look at the \cond, focus on participating the breadth of the subject. Evaluation of cadres must give full play to democracy, cadres and the masses handing over evaluation. Office work services leadership and service base, serve the people, then nominated the main object will contain a variety of services, so that assessment was accurate and to avoid one-sidedness. Third, pay attention to the seriousness of the conclusion. The use of evaluation findings is mainly embodied in his direction. Permitted to choose one, it would be tantamount to establishing a banner. Evaluation can't take care of the balance, otherwise it would undermine the offset thepositive significance of evaluation. Office of the party committees at all levels should take the findings as on the cadres ' bonus-penalty, an important basis for future movements, incentive and restraint effect of making evaluations. 3. Prevention of understanding \d development, concrete is dialectical,. In practice in the process, to prevent one-sided and still look, from actual people. One is to use dialectical point of view to understand. Humanist is the core of the scientific Outlook on development, remains the development of the scientific Outlook on development emphasizes, is still taking economic construction as the Center. Any departure from the development of thought and action, is a misinterpretation and misunderstanding of people-oriented. Adhere to people-oriented both to overcome one-sidedness of the old, but also to prevent one-sidedness, not accelerating the development of people and the opposition. Must be very clear, people oriented and speeding up development is not opposed, but consistent, we should never beAT7022内部包括时钟控制电路、模拟信号采样、参考电压、DSP、脉冲生成器、SPI通讯接口和电源管理七大部分，其内部原理框图如图2所示。
3．2 ATT7022的工作原理
ATT7022首先通过6通道16位∑-Δ的ADC模数转换电路来对输入电流和电压信号进行采样，转换后的数字量再经过24位DSP数字信号处理以完成全部三相电能参数的运算，同时将结果保存在相应的寄存器中并通过SPI口与MCU进行数据交换，DSP模块同时还生成有功/无功电能脉冲输出CF1/CF2，可用于现场校表。ATT7022在设计中已考虑到校表的方便性，采用全数字校表，只需适当修改校表寄存器即可实现校表功能。
3．3 串行SPI接口
ATT7022提供有标准的SPI接口，可与带SPI口的MCU直接连接，也可用适当的I/O口线仿真SPI总线，其仿真读写程序很容易实现。
ATT7022的一个数据传输总线从向SPI接口的DIN端送入8位命令字开始的，当命令中包括一个写入命令时，在其后的24个SCLK周期内，串口将持续从DIN端读入24位串行数据。当发出一个读取命令时，串口将根据发出的命令来进行寻址，然后在其后的24个连续的SCLK周期从DOUT引脚上串行输出寄存器内容。数据的传输总是MSB在前，LSB在后。读寄存器时，SCLK为高，数据在DOUT引脚上有效。而在写寄存器时，数据则在SCLK的下降沿从DIN引脚读入，这一点在仿真SPI读写操作子程序时应引起注意，否则读写寄存器将出错。
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基于SPI总线的电能计量芯片ATT7022及其在配电监测终端的应用
