Yes, I've seen them before
Only 70% value bothered me, i did not understand it well !!! Should i divide or multiply it in 1.7A my motor rated current or just use 1.7A directly to calculate vref , please tell the correct method, I do not want to burn the motors
1-Method
1.7A / 2 = 0.85v (vref)
2-Method
The motor use the full step mode so the current will be 0.7 times (70%) the current limit :
current limit = 1.7A / 0.7 = 2.43A
Vref = current limite / 2 ==> 2.43/2 2.43 = 1.21V
3-Method
vref = Inom * 5 * Rsense *0.7 so Vref = 1.7 * 5 * 0.1 * 0.7 = 0.6V