原标题：Allegro ACS71020电源监视解决方案

　　Allegro公司的ACS71020电源监视集成电路,采用霍尔效应电流绝缘的电流传感器技术,大大地简化了任何AC/DC电源设备的功率监测.用户可编程VRMS欠压/过压引脚,1kHz带宽,电流检测从0A到90A,I2C或SPI通信,通过EEPROM寄存器进行用户编程,16位电压和电流ADC.本文介绍了ACS71020主要特性,框图和典型应用电路图以及ACS71020演示板主要元件和电路图.

　　The ACS71020 power monitoring IC greatly simplifies the addition of power monitoring to any AC/DC powered device. By making use of Allegro’s Hall-effect-based, galvanically isolated integrated current sensor technology, reinforced isolation can be achieved. The sensor can be powered from the same supply as the MCU, eliminating the need for multiple power supplies and digital isolation ICs.

　　The isolated current measurement is done by detecting the magnetic field from the integrated conductor, eliminating the need for external sense resistors, current transformers, or Rogowski coils. Two Hall plates are used for this measurement to differentially sense the field, thus eliminating errors due to stray magnetic fields. Multiple parameters like bandwidth, averaging time, and fault levels are user-programmable.

　　The sensor features all key power measurements, which can be read out through I2C or SPI, as well as dedicated pins for voltage zero crossing (suitable for light-dimming applications) and fast overcurrent fault (for short-circuit detection). As the sensor is isolated, these pins can be easily accessed by the MCU without additional isolation to each signal. These two pins can also be configured to flag a VRMS under/overvoltage.

　　The ACS71020 is provided in a small, low-profile, surface-mount SOIC16 wide-body package. The ACS71020 is lead (Pb) free, and is fully calibrated prior to shipment from the factory. Further customer calibration in application can improve accuracy.

　　ACS71020主要特性:

　　Accurate power monitoring of AC/DC applications

　　Reinforced isolation up to 517 VRMS in a single package eliminates the need for dual isolated supplies (certification pending)

　　Active, reactive, and apparent power measurements, and power factor

　　RMS and instantaneous voltage and current measurements

　　0.85 mΩ primary conductor resistance for low power loss and high inrush current withstand capability

　　Dedicated voltage zero crossing pin

　　Overcurrent fault output pin

　　Hall-effect-based current measurement with common-mode stray field rejection

　　User-programmable VRMS under/overvoltage pin

　　1 kHz bandwidth

　　Current-sensing range from 0 to 90 A

　　I2C or SPI communication

　　User-programmable through EEPROM registers

　　16-bit voltage and current ADCs

　　图1.ACS71020框图

　　图2. ACS71020典型应用电路图

　　ACS71020演示板

　　Allegro ACS71020 demo board is pictured in Figure 2 below. Refer to Table 1 for symbol names and descriptions of onboard components. Note: Board is pictured without capacitors and resistors attached.

　　图3.ACS71020电流传感器演示板外形图

　　ACS71020电流传感器演示板元件表: