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Board Mount Current Sensors

Current sensors are either open- or closed-loop. Open-loop current sensors measure AC and DC currents and provide electrical isolation between the circuit being measured and the output of the sensor (the primary current is measured without electrical contact with the primary circuit, providing galvanic isolation). Less expensive than their closed-loop cousins, open-loop current sensors are generally preferred in battery-powered circuits given their low-operating power requirements and small footprint features.
Open loop current sensors provide digital output that changes from Vcc to 0.4 V when sensed current exceeds operation point.
Closed loop current sensors use feedback control to provide output proportional to measured current.

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