5.7 USB Connectors

The Power Debugger contains a USB “feed-through” section across its lower side. This is a convenience feature enabling a quick and easy connection to USB powered target boards.

The USB feed-through section has two USB connectors:
  • The left side “TARGET” connector is a USB Micro-B jack. Connect this to the host computer using the cable included in the kit.
  • The right side “TARGET” connector is a USB Type A jack. Connect this to the board being debugged.
Figure 5-4. USB Feed Through
The routing of the USB feed-through section is clearly indicated by the silkscreen on the board:
  • DATA lines are passed through untouched from the Micro-B jack to the A jack
  • GND is connected to the board ground
  • SHIELD is connected to board ground through a 1MΩ resistor
  • POWER (VBUS) is routed from the Micro-B jack to pin 1 on the B channel header
  • POWER (VBUS) is routed from pin 4 on both A and B channel headers to the A jack

The routing of the POWER line enables the user to easily connect up one of the following configurations:

  • Routing USB power from the TARGET USB connector through the B channel for measurement.

    Mount both jumpers on the B channel header as shown here.

    Figure 5-5. Jumper Configuration
  • Routing USB power from the TARGET USB connector through the A channel for measurement

    Use a single wire to connect POWER to the A channel and a jumper to connect the output as shown here.

    Figure 5-6. Jumper Configuration
  • Sourcing USB power from the DEBUG USB connector through the variable voltage source through the A channel

    Mount both jumpers on the A channel as shown here.

    Figure 5-7. Jumper Configuration
  • Sourcing USB power from the DEBUG USB connector through the variable voltage source through the B channel

    Use a single wire to connect POWER to the B channel and a jumper to connect the output as shown here.