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Building a custom MSP430f5529 board

Henry Bergin
Prodigy 60 points

Other Parts Discussed in Thread: MSP430F5529, MSP-TS430PN80USB

Hello there. So, I am trying to build my own msp430f5529 board and I've got the circuit made but when I try to program it with the TEST and RESET pins, code composer is telling me there's a communication error. I have a feeling it's because I don't have the correct pins connect to the chip, but there's very little out there on what should be connected so I don't know. The chip I'm using is a MSP430F5529IPN. On my circuit board, RST goes to the RST pin on the usb emulator on the launchpad, and is tied to the high side (3v3) via a 47k resistor. The TEST pin is tied to the TEST pin on the launchpad. And then all the DVCC and DVSS pins are tied to the appropriate power supply pins. (ground and 3v3). What pins am I missing? Does that VCORE pin need to be connected to something? Thank you.

  • 0
    Guru 25210 points
    You need VCC, Ground, Test and Reset pins to program with SBW. SBW is sensitive to stray capacitance, so you might want to look into what type of cabling you are using to connect to the LP FET interface.
  • 0
    TI__Expert 6140 points
    Hi,
    The VCORE pin must not be connected to anything externally. I recommend you look at the MSP430 hardware tools guide:
    http://www.ti.com/lit/ug/slau278t/slau278t.pdf

    Here you can find correct connections for JTAG (2 and 4 wire) as well as the schematic for multiple TI target boards that you can use as a guide for your design. Particularly, look at the schematic for MSP-TS430PN80USB. Also, if you search for "unused pins" on the device's User's Guide (page 66), you can see what to do with the pins you will not be using in your application:

    http://www.ti.com/lit/ug/slau208n/slau208n.pdf

    I hope this helps,

    Damian
  • 0 in reply to Damian Szmulewicz
    Guru 58965 points
    "The VCORE pin must not be connected to anything externally. "

    If it must not be connected to anything, why is it there? I thought it is there because an external bypass capacitor needs to be connected.
  • 0 in reply to old_cow_yellow
    TI__Expert 6140 points

    old_cow_yellow,

    Yes, the VCORE pins needs an external bypass capacitor. I meant to write that it cannot be used as a voltage source,  but I realize I did not explained it correctly. The bypass cap is typically  470nF, but check the device datasheet  for correct value.

    Damian

  • 0
    Guru 58965 points
    You said "... On my circuit board, RST goes to the RST pin on the usb emulator on the launchpad, ...", I presume the isolation jumper on the Launchpad is removed. Ditto about TEST.

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