User Manual

PD42-x-1140 Hardware Manual (V1.03 / 2018-JAN-25) 19

USB BUS POWERED OPERATION MODE

The PD42-x-1140 PANdrives™ support both, USB self powered operation (when an external power is supplied

via the power supply connector) and USB bus powered operation, (no external power supply via power supply

connector).

On-board digital core logic will be powered via USB in case no other supply is connected (USB bus powered

operation). The digital core logic includes the microcontroller itself and also the EEPROM. The USB bus powered

operation mode has been implemented to enable configuration, parameter settings, read-outs, firmware

updates, etc. by just connecting an USB cable between module and host PC. No additional cabling or external

devices (e.g. power supply) are required.

Please note that the module might draw current from the USB +5V bus supply even in USB self powered

operation depending on the voltage level of this supply.

Motor movements are not possible in this mode. Therefore, always connect a power supply to the Power and

Communication Connector for motor movements.