Current Sensor Features User Settable Over-Current Fault Outputs

The ACS720 Hall-effect-based current sensor IC with multiple programmable fault levels targets both industrial and consumer applications with a focus on motor control and power inverter stage applications. The device provides high isolation with a reduced bill of materials made possible by its proprietary IC SOIC-16W package. It works off of a single 5 V supply while maintaining an output voltage swing from 0 to 3 V, with a stable zero current output of 1.5 V. This allows the ACS720 to operate off of a 5 V supply while having an output which is compatible with typical 3.3 V ADCs found on many MCUs. Furthermore, the ACS720’s high PSRR rejects the noise often found on the supplies in the power section of the PCB or system, maintaining high accuracy in noisy environments. The device has dual fault functions that are user configurable. Fast and slow fault output allow for short-circuit and overcurrent fault detection. A user-created resistor divider from the power supply of the ACS720 is used to set the fault level. The fault outputs are open drain, allowing the user to pull them up to a compatible voltage for the MCU. The open-drain outputs also allow for implementing a simple logical OR of multiple sensor fault outputs. For more details, peruse the ACS720 datasheet.


Allegro MicroSystems

Worcester, MA