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msp432 external power and usb

Luca Palombella
Intellectual 560 points

Hi all,

is it possible to power msp432 with external supply but at the same time using usb connection for uart communication? What is the right approach? 

Thanks

  • 0
    Guru 74080 points
    If the supply voltage of the MSP and the emulation side match, this should be possible.
  • 0 in reply to Dennis Eichmann
    Intellectual 560 points
    I don't understand. With code have i to change something? with usb i have power supply for msp. How to set it?
  • 0 in reply to Luca Palombella
    Guru 74080 points
    There is no code dependancy, no. The MSP talks to the emulation side of the LaunchPad which is powered by the PC's USB. The system runs at ~3.3V generated by a LDO that is powered from the 5V. GND, TX and RX must remain connected for the communication, but instead of having the MSP powered from the LDO's 3.3V as well, you now want to cut this connection and power the MSP from somewhere else. Since the emulation side still sends data to the MSP at it's supply levels of 3.3V you have to power the MSP externally with this voltage as well. Otherwise when having a too large difference, the protection diodes of the MSP might turn on at it's RX line which can cause damage. I don't know if there are series resistors in the communication lines that would limit this current. If so, things could be different. Check the hardware design files for this information. On the other hand, if the voltage of the MSP is too low, the emulation side might not recognize the high level of the MSP properly.

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