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I'm new to STM32. Recently I'm trying to understand the schematic of it. I came across the term "soldering bridge" default: open. Does it signifies that the two pins are opened (which means not connected) or it means two of the pins are shorted?

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It's two adjacent pads intended to be bridged with solder to connect them depending on the board configuration. It's just like a jumper with header pins and a shunt but is cheaper and more permanent.

Open is not connected. Closed switch is connected. In electronics, we use the analogy of a switch, not a door or floodgate (which is opposite).

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It means they are normally not connected. You can place a blob of solder across it to connect if needed.

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    \$\begingroup\$ But it's a good idea to look at the board and check. That's the sort of thing that is most likely to not match the documentation. \$\endgroup\$ – TimWescott Jun 12 '19 at 16:04
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    \$\begingroup\$ Thank you for the help! I have performed connectivity on those bridges using my multi-meter and then verify that SB open signifies those bridges are not connected. \$\endgroup\$ – Chuang JY Jun 13 '19 at 1:25
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I would suggest it means "Not connected". Thus pin 4 on the P-channel MOSFET Gate has to be taken low to pass along U5V from Source to Drain.

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