Power monitoring IC with enhanced isolation and programmable AC/DC monitoring

     With the continuous development of the Internet and digital technology, as well as the rapid improvement of semiconductor technology, there are more and more new smart electrical devices around us, which have penetrated into various fields such as automotive, industrial, consumer and communication. People realize that power monitoring for these devices is becoming more and more important. On the one hand, it is necessary to reduce unnecessary power consumption, thereby improving efficiency and reducing operating costs. Tracking power changes also enables preventive maintenance of equipment, reducing the risk of unplanned downtime. In addition, it can also reduce the electromagnetic interference problems caused by various equipment.

     The ACS37800 is a Hall-effect power monitoring IC solution for single-phase AC and DC with very small PCB footprint. This integrated power monitoring chip detects the power, voltage and current of AC and DC signals in a small SOIC16W package with isolation ratings up to 1480 Vpk, reducing overall solution size, cost and complexity.

     The flexibility and configurability of the ACS37800 allow users to program it to meet a wide range of unique application requirements. Based on the user's low noise or multi-address requirements, the designer can choose a device whose factory Settings are I2C or SPI interfaces. In I2C mode, the ACS37800 provides zero-crossing detection, which makes LED dimming control easier. Undervoltage/overvoltage, current/voltage gain and offset, and overcurrent trip point thresholds can be programmed via EEPROM to optimize systems from ±30A to ±180A at temperatures ranging from -40 ° C to 125 ° C.

     The highly integrated design of the ACS37800 in an efficient SOIC16 package eliminates the need for many components required by competing solutions under the same conditions, thereby further reducing PCB size and significantly reducing bill of materials (BOM) costs and complexity. For example, the ACS37800 features a 517 Vrms enhanced isolation that enables current detection independently without the need for expensive components such as photoisolators, Rogowski coils, very large current transformers, isolated operational amplifiers, or shunt resistors.

     With an integrated voltage regulator, the ACS37800 can be powered at the same voltage as the system's microprocessor (5V or 3.3V). By calculating parameters such as active, reactive and apparent power, as well as instantaneous and RMS values of current, voltage or power, the ACS37800 simplifies common power triangle measurements. In addition, the ACS37800 is able to average these parameters through multiple instantaneous measurements in one minute, avoiding inaccuracies in the case of asymmetric waveforms. These features help reduce the system's dependence on microcontroller (MCU) resources.