The OP8320-3 board is used to clamp the current in both directions (source/sink) to prevent exceeding a device current rating, thus preventing damage to the device.
This board provides no customizable components. All settings are factory-configured.

Open

OP8320-3 Board interface

Example of Bidirectional Current

Open

Bidirectional current diagram

D+ and D- are connected back to back so they clamp the current in either direction.
The default setting is ±15 mA. The current can be limited from 0.1 mA to 18 mA, using a current regulator diode, chosen according to your requirements.