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Answered to the same question in another thread by
MARCEL MAJOOR
The (sense) resistor value is based on the the current 'protection' level you want. The current through this resistor generates a voltage which is 'sensed' by the L297 (Sense1/2). If the L297 protection level is set to 0.5V (Vref input) then the maximum current allowed through the motor winding would be 1A with a 0.5 ohm resistor. With a 10 ohm resistor this would be 0.05A . So, the selection is based on the allowed current through the motor winding and the Vref you are using. A typical VRef would be 1.2V (using a 1.2V reference 'zener'). If you require a maximum current of, for example 0.5A, then your resistor would be 1.2V / 0.5A == 2.4 ohm
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