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Current monitor eases bidirectional measurement

Posted: 13 Dec 2006 ?? ?Print Version ?Bookmark and Share

Keywords:current monitor? power management? current measurement? Zetex? power supply?

ZXCT1041 current monitor from Zetex

Zetex Semiconductors has announced the ZXCT1041, a bidirectional high-side current monitor that the company said draws a typical quiescent current of less than half that of alternative devices. The device has a simplified two-way current measurement in battery and power supply management as well as motor control applications.

With a typical IQ specified at just 35?A, the new device monitors the voltage developed across an external sense resistor and converts it into a single proportional unipolar output voltage. The direction of current flow is indicated by a flag pin, which removes the complication of output offset adjustment inherent in other monitors and simplifies MCU interfacing.

The current monitor's low offset voltage means a minimum accuracy of 2 percent can be achieved for a sense voltage of 100mV, suiting the use of very small sense resistors required at higher currents. The device's open collector current direction flag enables the logic signal to be referred to a supply much lower in voltage than the rail being sensed, thereby simplifying signal interfacing.

Provided in the 3.1-by-3mm footprint SOT23-5 package, rather than the much larger MSOP8 package, and integrating a gain setting resistor achieving an internal gain of 10, the ZXCT1041 presents a highly cost effective and space efficient solution.

Handling a wide high side input voltage range of 2.7V to 20V, the ZXCT1041 supports a wide range of applications and multiple battery cell configurations. The bidirectional current monitor's many uses include battery capacity measurement and overcurrent protection in motor control and battery charge/discharge circuits.

The ZXCT1041 is available through Zetex distribution channels for 51 cents in 10,000 quantities.

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