Hello

Some schematics have capacitor and resistor at the sense inputs of the L297, in the L297 datasheet and in the AN470 there's no mention of them, the following schematic found here : http://www.electronics-lab.com/projects/motor_light/011/index.html

Can someone explain what is the purpose of these ?
Is is a simple delay T = R(ohms) x C(farads) ?

 

Voltage across the sens resistor takes form of a spike.
The addition of an RC filter smooths these spikes.