I found the following circuit symbol in an MSP430 User's Guide in the section describing the ADC:

weird symbol

(I made a red circle around it)

What does it represent?

  • \$\begingroup\$ Never seen that before, don't know what it's supposed to mean. \$\endgroup\$ Commented May 30, 2013 at 22:16
  • 1
    \$\begingroup\$ Perhaps it's a deluminator. \$\endgroup\$
    – Phil Frost
    Commented May 31, 2013 at 0:32

2 Answers 2


The diagram on page 631 of the user guide has it labeled "Temp. Sensor".

This is the internal Block Diagram for the SD24_A ADC, but it's almost functionally the same for the other ADC Types

enter image description here

  • 2
    \$\begingroup\$ It's a Temperature Sensing Diode. Listed as a diode on Page 592 as well. \$\endgroup\$
    – Passerby
    Commented May 31, 2013 at 1:57

I've seen varactor symbols that look similar, but they always have two parallel lines at the top of the triangle. A triangle pointing upwards can also be used to represent a power plane, but that doesn't make sense due to both it's location, the line through it, and the current source directly above it.

Is there a legend somewhere in the document that might explain it? Also, if we had an image of the entire schematic someone might be able to piece together what it might be.


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