Variable reluctance sensor interface with integration based arming threshold

A method of processing a variable reluctance sensor signal provided by a variable reluctance sensor, comprising:

• integrating the variable reluctance sensor signal and providing a corresponding integrated signal indicative of a total flux change of the variable reluctance sensor;
• comparing the integrated signal with a predetermined arming threshold and providing a corresponding armed signal;
• comparing the variable reluctance sensor signal with a reference signal and providing a zero detect signal indicative thereof;
• clearing the integrated signal after the armed signal is provided;
• providing a crossing signal when the zero detect signal is provided after the armed signal is provided;
• holding the crossing signal in reset until the zero detect signal is provided;
• releasing the crossing signal from reset when the zero detect signal is provided;
• and
• after releasing the crossing signal from reset, providing the crossing signal in response to the armed signal being provided.