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Voltage_of_MSP430G2

Antonios Karipidis
Prodigy 150 points
Other Parts Discussed in Thread: MSP430G2553, MSP-FET, ENERGYTRACE, MSP430F1612

I' m a beginer user of TI ->MSP430G2553

I' m not sure about the voltage on MSP

While connecting with the PC using USB port

IS the voltage OK ->about 1.8 -3.6 V

Or we need to send extra Voltage to pins Vcc-GND...

  • 0
    Guru 20670 points

    Hi Antonios,

    The USB port itself provides 5V. There's a 3.3V (or is it 3.6V? i don't remember now) regulator in the board to power the MSP430 and the components in the programmer that work at 3.3V.

    The VCC on the board connected to the MSP430G2553 are direct into the MCU so you need to connect it to 1.8-3.6V.

    If you take of the jumpers that connect the 3.3V to the MSP from the programmer, then you have to power the MCU VCC with the correct voltage. The programmer itself will get power from the USB. Remember to keep the GND, RST and TEST if you want to program the MSP and the RX and TX if you want to debug it.

  • 0 in reply to Luis Afonso
    Guru 227245 points

    If you pull the VCC jumper and power the target MSP externally, you also have to pull the jumpers for all other signals (SBW and application UART), as the signal voltage from the FET side will still be 3.3 (or 3.6) V. If the MSP runs on 1.8V then, this may burn the port pins. Of course you can’t debug then.
    The ‘real’ MSP-FET can adapt to the target MSPs voltage. That’s why it is a ‘bit’ more expensive (along with other advantages).

  • 0 in reply to Jens-Michael Gross
    Guru 20670 points

    I was reading this and i got a bit startled. If it was that expensive just because of the ability to control the output voltage i would make one with the MSP430F5 launchpad and a adjustable regulator and some  other data level converters by less than 15€, ahah. Don't scare me like that

    Good to know, i didn't take into account the different voltage

  • 0 in reply to Luis Afonso
    Guru 227245 points

    Well, it is more than that. The MSP-FET has a programmable supply voltage, and uses digital level shifters so the I/O signals are driven with the MSP Vcc level (if different form the FET voltage). It also has the hardware to blow the physical JTAG fuse on 1x, 2x and 4x devices, and has the EnergyTrace hardware included.
    It also contains the license (and gets the required updates) to support all MSPs, not just the ones the LaunchPad was built for.

    And don’t forget that the LaunchPads are sold way under value, so the low LP price cannot be compared to a standard-priced development tool. (the G2 LaunchPad, for example, is sold for only a fraction of the individual component prices - the MSP430F1612 alone is more expensive than the whole G2 LP)
    It’s easy to forget that cost is not only component cost (or else, a full license of the compiler shouldn’t cost more than the CD production, and nothing at all if sold as download)

  • 0
    Expert 2425 points

    hi,

    voltage from usb is sufficient.

  • 0
    Prodigy 150 points

    Thank you,

    all of you

    for your responses

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