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Voltage detector enables safer system operation

Posted: 23 Mar 2011 ?? ?Print Version ?Bookmark and Share

Keywords:voltage? detectors? safety? sensor?

STMicroelectronics introduces the STM1831 voltage detector for use in autonomous systems and safety-related devices. The device enables electronics to recover safely if a voltage drop occurs in the power supply. The device has independent connections for the sense input and its own supply voltage, letting the voltage detector operate reliably even if the monitored voltage falls to 0V.

STM1831

A selection of factory-trimmed voltage thresholds is available from 1.6V to 5.7V in 100mV increments to give designers flexibility to specify the exact voltage threshold they need to meet specific design requirements.

The device lets engineers program the delay between the time when the monitored voltage returns to normal and when the detector deactivates its alarm output. Only one external capacitor is needed to program the delay, providing flexibility and simplifying design. The STM1831 also draws as little as 0.8uA typical supply current, allowing use in low-power applications such as battery-operated equipment.

Major features of the STM1831 include 2 percent voltage threshold accuracy; operating voltage of 1.6V to 6.V; open-drain output; power supply transient immunity; and operating temperature range of -40C to +85C.

The STM1831 is in production now, in the SOT23-5 5-pin package, priced at $0.245 in quantities of 1,000. Alternative pricing options are available for larger quantities. Also, a variant of the device offering a threshold voltage of 1.18V is currently sampling to lead customers and will be available in production quantities in April 2011.





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