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Circuit Transducer
November 2007
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Minisens is a miniature integrated circuit transducer for ac and dc isolated current measurement up to 100 kHz. The component offers full isolation (no optocouplers required) and high sensitivity (from 20 mV to 200 mV per amp of primary current) with no insertion losses. To reduce manufacturing cost, it is mounted directly onto a printed circuit board as an SMD device. The unit integrates, in one mixed-signal ASIC, Hall-effect sensors with a magnetic concentrator to allow direct current measurement without the need for an additional magnetic core. The noncontact measurement enables an almost unlimited current level, eliminating the need for current flow through the device. The only limiting factor is the thermal capacities of the primary conductor. The current can be carried either by a track (or tracks) located on a PCB underneath the transducer or by a cable or bus bar under or above the IC. The unit operates from a single 5-V supply. To minimize power consumption, an optional input pin can be used to switch the device into standby mode. The transducer is manufactured with a CMOS process and assembled in an SO8 IC package.



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