SLAU533D September 2013 – April 2017
The 5-V VBUS and 3.3-V power rails, which are sourced to the target from the emulator, travel through the isolation jumper block. This routing serves these functions:
Measuring the target power draw is as simple as removing the 3.3-V jumper and connecting an ammeter across it. The USB hub, emulator and dc-dc converter currents are then excluded from this measurement. However, anything that is connected on the F5529 LaunchPad development kit headers or power pins on the target domain below the dotted silkscreen line are included. If precise current measurement is needed, it is important to disconnect the backchannel UART and SBW lines in the jumper block as well.
See Section 2.3 for more information about measuring power using these jumpers.
Sometimes you may want to use an external 3.3-V power source connected to the target power header pins. In this case, the 3.3-V jumper must be disconnected to avoid back-powering the emulator. See Section 2.4 for more information on this procedure.
Otherwise, in normal operation, both these jumpers should be attached.