I use a Banana PI BPI-R3 in combination with a Quectel EC25 AUX modem soldered on a normal Mini PCI-E card (I just buyed the card as a consumer product).
The Modem works fine. I established successfull an Internet connection! But the modem is usually not the main connection for getting internet. To reduce power consumption I wanted to shut down the modem. Because even with AT+CFUN=0 the consumption is to high for something which I normally not use.
My Problem is the automatic reboot after shutiing down the modem. I can send the AT+QPOWD command and the modem shuts down. Status LED of BPI-R3 go’s off. But after some seconds it turns on by itself.
If I understand it right (from other chats), a 10 kΩ resistor on the mini PCI-E Board (connected to GND) is responsible for that? There is no other explaination for this behavoir?
Should that be right, I assume that the resistor is located on the mini PCI-E Board because I looked on the pinning of the Board. → There is no outgoing PWRKEY. PWRKEY is for me just visible on the LGA Device:
Can someone show me on the picture which I uploaded, where the resistor is located? I’m really in trouble, because I found no schematic drawing of these (Quectel?) Mini PCI-E PCB’s.