ACS71020: Single Phase, Isolated, Power Monitoring IC with Voltage Zero Crossing and Overcurrent Detection

The ACS71020 power monitoring IC greatly simplifies the addition of power monitoring to any AC 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.

隔离电流测量是通过检测集成导体的磁场来完成的，不需要外部感测电阻器、电流互感器或罗氏线圈。两个霍尔板用于此测量，以区分感测磁场，从而消除杂散磁场造成的误差。带宽、平均时间和故障级别等多个参数都是用户可编程的。

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.

• Accurate power monitoring of AC applications
• Reinforced isolation up to 517 VRMS in a single package eliminates the need for dual isolated supplies
• 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
• 过流故障或者tput 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