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I have a board with the following connections:

TMS TDI TDO RXD TXD RTCK TRST TCK GND

I am trying to connect my USB UART TTL to it (I have connected the RXD, TXD, GND) but I am not sure which pin I should connect the 5v to?

Any advice would be great, thanks

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    \$\begingroup\$ Isn't there a VCC pin? What type of board do you have, could you please provide a part-number or datasheet? \$\endgroup\$
    – Bence Kaulics
    Aug 13, 2015 at 9:46
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    \$\begingroup\$ I don't think it's any of those. I think that there are other pins that you're missing. \$\endgroup\$
    – David Smith
    Aug 13, 2015 at 9:57
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    \$\begingroup\$ The board should power itself from USB and probably provides 5 volts out on that pin, which your target board doesn't need. Try it with just the 3 connected. \$\endgroup\$
    – DoxyLover
    Aug 13, 2015 at 10:00

1 Answer 1

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As confirmed in the comments, the USB-to-UART board is self-powered from USB and can provide +5V to the connected device. Since your connected device is also self-powered, the 5V pin should not be connected.

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