07 November 2019

Not all CDM324 are created equal

Since there is probably no way to use my three specimens of CDM-324 24 GHz radars, I decided to open one of them. Remember there is a well done teardown of a similar module on youtube, which I use as a reference.

The lid is glued and comes off sliding a blade all around the perimeter. Don't try to pull or lift, it doesn't work.

Surprise: there is no RF sponge in the lid vs. the module shown in the video. Also the PCB layout is slightly different, some vias are not present either.

Unfortunately there seems to be no identifiable physical sign that helps spotting different modules.