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Limit clamp currents on digital and analog inputs

Posted: 02 Sep 2014     Print Version  Bookmark and Share

Keywords:Digital  analog input pins  Electrostatic Discharge  ESD  diodes 

Digital and analog input pins require protection from input voltages that are negative or positive exceeding the maximum input levels. This is a practical explanation of using the Electrostatic Discharge (ESD) protection diodes that are part of the input pins to help limit the voltage if input current is limited.

A good example of an input signal that requires both current and voltage limits is a 12 V automotive signal from a switch. An automotive switch signal typically comes from outside of the module and follows the battery voltage. Any type of signals coming from outside the module must have signal conditioning circuitry to limit noise spikes that can damage the device from over current or over voltage. Typically these circuits take the form of a voltage divider with a capacitor included to limit the effect of voltage transients.

View the PDF document for more information.

Originally published by Texas Instruments Inc. at as "Limiting Clamp Currents on Hercules Digital and Analog Inputs".

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