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Using a multiple voltage supervisor for over and under voltage power supply shutdown and fault monitoring

Posted: 21 Sep 2009     Print Version  Bookmark and Share

Keywords:power supply  voltage supervisor  fault monitoring 

Reliable system operation is often dependent on the quality of the power supplied. Supply voltages that are too low can cause faulty operation as the microcontroller, FPGA or ASIC begins to send bad data to memories or peripheral devices. A voltage that is too high can permanently damage system components. So, it is often necessary to add protection circuits to the design. In addition to providing protection in the event of a voltage fluctuation, it is also valuable to identify the source of a failure.

This application uses an X40435 device from Intersil along with 2 FETs and some resistors to provide power shutoff. The 2-wire interface and fault register of the X40435 provides fault monitoring capability. This device also includes 4Kbits of EEPROM for maintaining information, such as manufacturing and service records. The X40435-C monitors three input voltages with voltage thresholds of 4.6V, 2.9V and 1.0V.

View the PDF document for more information.

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