I am trying to adapt my laptop's webcam into a USB webcam. Although I couldn't find any schematics online, the manufacturer did print (I assume) labels to identify the 8 wires coming out of the webcam.Back of webcam

If possible I want to have the microphone work. I'm assuming I will need to wire it up to both a USB (power and camera) and a 3.5mm jack (mic). The two problems I am facing is knowing which ground I should solder to the USB and what the 3 Mic wires are for. (Googling has only shown me about headsets with 1 mic wire for a 3.5mm jack.)

Does anyone know what the C/D/P stands for? Google has not helped so far. For the ground problem, I think the GND wire closest to the data +/- wires is for my USB connection, but the line drawn connecting the other GND to V33D wire has me less confident. (Which is for the MIC?)

I know wire colouring doesn't mean anything, but in case anyone has the same model the colours are as follows:

GND     white
MIC_C   purple
MIC_D   blue
MIC_P   green
GND     yellow
DP      black
DM      orange
V33D    red
  • \$\begingroup\$ Is the mic signal from the board analogue or digital? Are you sure the camera output is usb compatible? \$\endgroup\$
    – HandyHowie
    Jul 13, 2021 at 5:47
  • 3
    \$\begingroup\$ 3.3V instead of 5V, and DP/DM and Ground, indicates it's a usb camera. The mic is likely not a simple one as newer mics have multiple microphones and advance canceling or multispatial features. \$\endgroup\$
    – Passerby
    Jul 13, 2021 at 6:42
  • \$\begingroup\$ The line indicates the connector body. And the 1 indicates pin 1. Colors don't matter. \$\endgroup\$
    – Passerby
    Jul 13, 2021 at 6:43
  • \$\begingroup\$ @Passerby If mic is complex as you say I probably wont bother. Thanks for explaining the pin markings, I'll just give it a go with the GND that is wired closest. Worst that happens is the webcam fries when I test it. \$\endgroup\$
    – Frank
    Jul 13, 2021 at 7:01
  • 4
    \$\begingroup\$ My guesses are "clock", "data" and "power". It's not I2S because that requires an additional "word clock". (unless P is the word clock, but how do you get the letter P from that?) Might be I2C or PCM or something. If you have an oscilloscope and the laptop still works, you could watch how the laptop interacts with the microphone. \$\endgroup\$ Jul 13, 2021 at 8:32

1 Answer 1


As user253751 said. Had same idea so instead searched for smd mic connections and got the schematic. P-power, D-data and C-clock. https://www.cuidevices.com/blog/analog-or-digital-how-to-choose-the-right-mems-microphone-interface


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