I am trying understand the schematic for a Waveshare Core 407I board, with an STM32F407IGT6 MCu. What is the meaning of this schematic symbol (labelled COMP.J1 JPAD3)?

Link to full schematic: https://www.waveshare.com/w/upload/4/4a/XCore407I-Schematic.pdf

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I've identified it on the board to be a blob of solder next to a square contact. What component is this if I were to draw it myself in an EDA program?

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  • \$\begingroup\$ it is similar to a 3 pin header with a push-on jumper \$\endgroup\$ – jsotola Aug 10 at 6:51
  • \$\begingroup\$ These are also knows as "solder blob jumpers", unofficially. \$\endgroup\$ – Nick Alexeev Aug 10 at 16:31
  • \$\begingroup\$ Also, J is a common standard identifier for jumpers generally (like D1 (diode), R1 (resistor), L1 (inductor), Q1 (transistor), TP1 (test point), J1 (jumper), etc). \$\endgroup\$ – J... Aug 10 at 16:38

It's known as solder bridge.

A solder bridge consists of two, closely-placed SMD pads that can be shorted easily with solder.

The one shown in the question is a 3-terminal solder bridge. Think of it as an SPDT switch. PDR_ON signal is the COMMON terminal. It can be shorted to either +3.3V or GND.

NOTE: Your EDA software (probably Altium) may not have a solder bridge component or equivalent. You may need to build your own.

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