Datasheet ACS71020 (Allegro)

ACS71020 Single Phase, Isolated, Power Monitoring IC with Voltage Zero Crossing and Overcurrent Detection FEATURES AND BENEFITS DESCRIPTION
• Accurate power monitoring of AC/DC applications The ACS71020 power monitoring IC greatly simplifies the • Reinforced isolation up to 517 VRMS in a single package addition of power monitoring to any AC/DC powered device. eliminates the need for dual isolated supplies (certification By making use of Allegro’s Hall-effect-based, galvanically pending) isolated integrated current sensor technology, reinforced • Active, reactive, and apparent power measurements, and isolation can be achieved. The sensor can be powered from power factor the same supply as the MCU, eliminating the need for multiple • RMS and instantaneous voltage and current measurements power supplies and digital isolation ICs. • 0.85 mΩ primary conductor resistance for low power loss The isolated current measurement is done by detecting the and high inrush current withstand capability magnetic field from the integrated conductor, eliminating • Dedicated voltage zero crossing pin the need for external sense resistors, current transformers, or • Overcurrent fault output pin Rogowski coils. Two Hall plates are used for this measurement • Hall-effect-based current measurement with common- to differentially sense the field, thus eliminating errors due to mode stray field rejection stray magnetic fields. Multiple parameters like bandwidth, • User-programmable VRMS under/overvoltage pin averaging time, and fault levels are user-programmable. • 1 kHz bandwidth The sensor features all key power measurements, which can • Current-sensing range from 0 to 90 A be read out through I2C or SPI, as well as dedicated pins for • I2C or SPI communication voltage zero crossing (suitable for light-dimming applications) • User-programmable through EEPROM registers and fast overcurrent fault (for short-circuit detection). As the • 16-bit voltage and current ADCs sensor is isolated, these pins can be easily accessed by the MCU without additional isolation to each signal. These two
PACKAGE
pins can also be configured to flag a VRMS under/overvoltage. 16-pin SOICW (suffix MA) 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. Not to scale
REINFORCED L (N) N (L) ISOLATION
1 MΩ 1 MΩ R 1 MΩ 1 MΩ SENSE 1 16 IP+
ACS71020
VINP
MCU
2 15 GND IP+ VINN 3 14 IP+ GND
To User
4 13 IP+ VCC VCC IP 5 12 IP- SDA / MISO 6 11 IP- SCL / SCLK 7 10 IP- DIO_0 / MOSI 8 9 IP- DIO_1 / CS
Linear Single Output Regulator Isolated Power Supply (Flyb , ack etc.) Figure 1: Typical Application
ACS71020-DS June 20, 2017 MCO-0000459 Document Outline Features and Benefits Description Package Typical Application Selection Guide Absolute Maximum Ratings Isolation Characteristics Thermal Characteristics Functional Block Diagram Pinout Diagram and Terminal List Digital I/O Electrical Characteristics Data Acquisition ADCs Raw Signal Sensitivity and Offset Trim Phase Compensation Zero Crossing Power Calculations Digital Communication Registers and EEPROM EEPROM Error Checking and Correction (ECC) Memory Map Volatile Memory Map Application Connections Recommended PCB Layout Package Outline Drawing