Many of the pins on the third board-to-board connector on the CM3 have functions which are obvious from the names, such as the GPIO, EDP, MIPI_DSI_TX0 / LVDS_TX0, HPL_OUT/HPR_OUT, SPKN_OUT/SPKP_OUT, USB2 and USB3, VCC_BAT-/VCC_BAT+, etc. Most of these seem to map directly to pin names in the RK3566 or RK817 datasheets.
However, I am unsure about the function of a few pins:
- 14: PCIE_PWREN_H
- 36: HP_DET_L
- 64,66: MIC1_IN and MIC2_IN. (I assume these connect to MIC1N/MIC1P on the RK817?)
- 92: N17778843
- 94,96,98: Are the USB_5V_IN pins connected to the 5V_INPUT pins on connector 1?
- 97: USB_OTG0_VBUSDET