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2.4 Power

The board was designed to accommodate various powering methods, including through the on-board

XDS110-ET and from an external source or BoosterPack.

Figure 10. MSP‑‑EXP432P401R Power Block Diagram

2.4.1 XDS110-ET USB Power

The most common power-supply scenario is from USB through the XDS110-ET debugger. This provides

5-V power from the USB and also regulates this power rail to 3.3 V for XDS110-ET operation and 3.3 V to

the target side of the LaunchPad. Power from the XDS110-ET is controlled by the isolation block 3V3

jumper, ensure this jumper is connected for power to be provided to the target MCU side.

Under normal operation, the LDO on the XDS110-ET can supply up to 500 mA of current to the target side

including any BoosterPacks plugged in. However, when debugging and using the EnergyTrace technology

tool, this current is limited to 75 mA total. Be aware of this current limitation when using EnergyTrace

technology.

2.4.2 BoosterPack and External Power Supply

Header J6 is present on the board to supply external power directly. It is important to comply with the

device voltage operation specifications when supplying external power. The MSP432P401R has an

operating range of 1.62 V to 3.7 V. More information can be found in the MSP432P401xx Mixed-Signal

Microcontroller data sheet .

SLAU597–March 2015 MSP

‑

EXP432P401R LaunchPad™ Evaluation Kit

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