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bringing up a new MSP430F5528 board on USB -Windows

David Burton
Expert 1330 points
Other Parts Discussed in Thread: MSP430F5510

I have a new design and new to make sure it works before giving to to the SW guy.   Everything check out on the board HW, but when I pug it in to USB it is not detected.  I followed slaa457 on the HW connections and it looks OK to me.

Maybe this is a dumb basic question, but shouldn't the BSL come up and somehow present itself to Windows or be otherwise discovered?

We originally used the Launchpad board to do the first evaluation and that works quite easily.  This revision integrates the 5528 on the target board and eliminates the extra HW.

Thanks.

  • 0
    Guru 34483 points

    If device is blank (mass erased) it will be entered to USB BSL / enumerate automatically. In any other case there must be BSL button (forcing PUR pin high). 5V is sourced from USB? Why internal 3.3V reg is not used? Having RESET button on board is not a bad option.

  • 0 in reply to zrno soli
    Expert 1330 points

    The device is new freshly loaded on the board so nothing has been done to it since the factory.  5V is supplied by USB and the 3V on-board regulator powers everything on the target board.  3.3V is valid.  I have attempted HW reset but it didn't have any effect.  There is some 4 MHz on the resonator.  I've also tried forcing PUR high with a 120 ohm pullup, also with no effect.

    There will be no manual reset on this product.  It needs to power up good to go with no other intervention.

    Thanks.

  • 0 in reply to David Burton
    Guru 34483 points

    USB part on schematic is OK. If MSP430 is blank, 5V are coming from USB, and 3.3V on-board reg have on input 5V from USB, with 4 / 8 / 12 / 24 MHz XT2, after plugging USB cable to PC (MSP430 powering up) it must automatically enter to USB BSL mode.

    I also tried (MSP430F5510) blank device (another ti e2e topic) with external (not coming from USB) 3.3V / 5V, and it also entered automatically to USB BSL mode.

    I only had problems, when XT2 was wrong (not 4 / 8 / 12 / 24 MHz), or device was running on different voltage than 3.3V (VCC was 2.1V) so voltage on PUR pin was not pulling enough (must be close to 3.3V).

  • 0 in reply to zrno soli
    Expert 1330 points

    Well, my XT2 resonator is 4 MHz and the supply is 3.3V as provided by the on chip regulator.

  • 0 in reply to David Burton
    Expert 1330 points

    I am finding my resonator does not function properly until I touch the XT2 output terminal with a scope or meter probe.

    I am using Murata Ceralock CSTCR4M00G53Z-R0 resonator which supposedly does not require any external capacitance.

    Each time I reset the uP I have to touch the resonator drive terminal again to see oscillations actually occur on the XT2 input terminal.

    Adding 10pF on the XT2 pins allowed it to run on power up.

  • 0 in reply to David Burton
    Guru 34483 points

    David Burton said:

    I am using Murata Ceralock CSTCR4M00G53Z-R0 resonator which supposedly does not require any external capacitance.

    If CSTCR4M00G53Z is standard Quartz crystal with integrated 2 caps, than it should work. But, just to be completely sure that problem is not in XT2, if you are able, try to replace resonator with standard 4 / 8 / 12 / 24 MHz Quartz.

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