Date: 20/03/2011

Voltage detector with independent sense input and own supply

ST Microelectronics has released improved voltage detectors with extra features. The STM1831 voltage detector is suggested for use in design of electronic equipments such as autonomous systems and safety-related devices to protect them against a voltage drop in the power supply. ST says unlike other voltage monitors, the device has independent connections for the sense input and its own supply voltage. This allows the voltage detector to operate reliably even if the monitored voltage falls to 0V.

The factory-trimmed voltage thresholds in the range of 1.6V to 5.7V in 100mV increments are offered to meet the exact voltage threshold they need to meet specific design requirements.

Engineers can program the time delay between when the monitored voltage returns to normal and when the detector deactivates its alarm output. STM1831 can operate from single external capacitor to program the delay and draws only 0.8uA typical supply current.

Major features of the STM1831:
±2% voltage threshold accuracy
Operating voltage 1.6V to 6.0V
Open-drain output
Power supply transient immunity
Operating temperature range: -40°C to +85°C

Visit st.com for more info.