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MSP430G2 Launchpad - No USB FET was found

Mael Manesse
Prodigy 10 points

Other Parts Discussed in Thread: ENERGIA

Hello!

Received my MSP430G2 with a M430G2553 a couple days ago! I'm working on Win 7 64 bits. I installed the drivers, plugged the launchpad over USB, everything worked fine. 

I programmed it a couple times with Energia, no problems. Today, when trying to program it, I get a No USB FET was found error. I checked the serial port, which is now greyed out in Energia. The device does not show up in Device Manager (but the drivers are installed. I uninstalled them and reinstalled them, no dice.). When plugged in, the PWR led on the board lights up, but the board is not enumerated via USB. I tried to plug it in a different computer, the USB dialog does not pop up... I'm a bit worried.

Not sure what happened, is there anything I can do to bring it back to communicate through usb/COM port?

Thanks!

  • 0
    Guru 227245 points
    You may have destroyed the FET on the LaunchPad. It can happen when the FET is attached to a target that is not isolated from the power source (e.g. a badly isolating external supply). Then potential differences between the target supply and the PC supply (which is often too not the best regarding isolation: not hazardous to humans but maybe deadly for electronics) may result in a large voltage difference that damages the FET. Especially if the PC is turned on or off while the target is still attached. This is a common problem for USB-attached devices and can only be avoided by using an optical isolator for USB. Which would require a separate power supply for the FET then.
    Well, usually, USB devices are either bus powered or come with a power supply that is suitable for USB (proper protection). In case of a target PCB this is not always the case.

    However, a more likely reason is a defect on the USB cable (try a different one, most cheap USB cables are low quality and often break) or the USB connector of the FET (due to mechanical stress).

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