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MSP430G2231 usage without being connected to eval board

Kevin Ting
Intellectual 310 points
Other Parts Discussed in Thread: MSP430G2231

So I have the MSP430G2231 that comes with the launchpad series and it comes on an evaluation board that we can connect to the computer via USB cord and write code to it through CCS or IAR.  My question is once the desired code is written onto the MSP430, and we disconnect the microprocessor from the eval board, how can we power/connect the processor to the rest of the circuit to make it work as programmed?

Specific concerns:

1) How to power it? Apply necessary voltage to VCC?

2) Do I need to add any external components? (Resistor, inductor, capacitors)?

Anything else I need to keep in mind?

Thanks for your help, 

Kevin

  • 0
    Guru 227245 points

    Kevin Ting said:
    How to power it? Apply necessary voltage to VCC?

    Yes. If using the LaunchPad board, you might need to remove the jumper that normally provides VCC form the programmer half of the LaunchPad, so your externally applied VCC doesn't power the programmer side too backwards.

    Kevin Ting said:
    Do I need to add any external components? (Resistor, inductor, capacitors)?

    The only external parts required for almost any MSP processor are a pullup resistor from RST to VCC (e.g. 10k) and a pulldown capacitor (e.g. 10..100nF) from RST to GND. And maybe a buffer or deblocking capacitor between VCC and GND. Anything else is optional.

  • 0 in reply to Jens-Michael Gross
    Intellectual 310 points

    Hi Jens,

    So when you say remove the jumper, do you mean the USB cord?  If so, I assume you are implying that it would be easier to connect the eval board with the MSP430 attached to it, to the rest of the circuit (and just power the pin that says Power or VCC, I guess).  I was thinking to completely take off the MSP430 from the eval board, in which case removing the jumper would be excessive.  However, the eval board already has a lot of the passive components soldered onto it that you mentioned so it is probably easier to use the eval board as a sub-circuit instead of adding those components myself.  What do you think?

    Thanks,

    Kevin

  • 0 in reply to Kevin Ting
    Guru 227245 points

    Kevin Ting said:
    So when you say remove the jumper, do you mean the USB cord?

    No. Between the programmer part and the side with the socket and the breakout connecters, there is a jumpered connection. If you remove all the jumpers, the programmer side is totally (except for GND) separated from teh side with the socket.

    However, if you want to use the processor completely off the LaunchPad, the resistor and capacitor on RST and teh capacitor on teh supply are the only things that are really needed. Everything else depends on your project requirements.

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