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External power supply

rubinstein
Prodigy 90 points
Other Parts Discussed in Thread: MSP430FG4619

Hello all,

I have a problem with running my MSP430FG4619 on an external power supply. My device sits on a TS430PZ100 board Rev:1.2. I did not have any issues with programming or running the MSP430 when I used internal power supplies. But when it comes to powering using an external power supply, I could not do it.

My board's schematic is the one on pg 109 of the pdf at the following link:

http://www.ti.com/lit/ug/slau278q/slau278q.pdf

And on that schematic, it says,

"If external supply voltage:

remove R11 and add R10 (0 ohm) 

remove R8 and add R9 (0 ohm)"

I did exactly that. But for some reason, when I power it up, and try to implement my code on the MSP430 with IAR, I get the error:

Fatal error: Could not find device (or device not supported) Session aborted!

Just so you know my supply voltage is 3 V. Is there any other trick I should be doing before connecting to the power supply?

Thanks a lot.

  • 0
    Prodigy 90 points

    A correction to the schematic page,

    my board's schematic is the one on pg 103 of the pdf at the following link:

    http://www.ti.com/lit/ug/slau278q/slau278q.pdf

  • 0
    Guru 227245 points

    Swapping R8 to R9 switches the FET from voltage supply to voltage sense mode. So the FET adjusts its I/O signals to VCC rather than supplying VCC.

    R10/R11 are only of interest when using the bootloader connector.

    Besides this, you only have to put your supply voltage to the proper pins of J5 (J5.1 for VCC and J5.2 or J5.3 for GND) That's all. Should work. If not, check your power supply (ramp-up, noise, ripple, spikes etc.)

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