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5. Interface
ISD02/04/08 driver's logic control inputs are all optically isolated. All opto-isolators share one common
anode (VCC) as shown in above schematic diagram. Typically, VCC is 5V. However, 3. 3V or voltages
higher than 5V are also acceptable, so long as the current through the opto-isolator's emitter is between
5~20mA.
Should a voltage higher than 5V be applied to VCC, an additional resistor is needed for every terminal to
ensure that the current through each emitter does not exceed 20mA.
Please note: in most situations, VCC can also be used as common cathode connection. This is because
the opto-isolators used in ISD02/04/08 are bidirectional (AC&DC) type.
5.1 Adjust Output Current
ISD02/04/08 is capable of providing maximum2A / 4A / 8A per phase output current respectively. In
specific application, the peak output current needs to be adjusted to meet the rated motor current. A
trimmer (potentiometer) is provided to serve this purpose at the bottom of the controller, as shown in the
following figure. Measuring the mapped voltage (Va) when tuning the trimmer provides a easy way to set
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Figure 3:Typical application
Figure 4:Optically Isolated Input Interface
4
Integrated Stepper Motor Driver ISD02/04/08
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