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USB connection Microcontroller

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ctzof

ctzof

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Hello,

I want to design a wireless sensor board based on SAMR21. The board is going to be a standard half mini PCIe board and I want be able to connect this board to a pc through PCIe mini. The board is going to communicate with the PC with SAMR21s USB interface. The problem is I got a little bit confused with the connection of the USB. All I need is to connect DM and DP to USB_D- and USB_D+ of PCIe or not. Also PCIe produces 3.3 V and I want to use this value to power also the board, can I use 3.3 V for VBUS of USB interface or it has to be 5 V like in standard USB. If anyone knows a little more about PCIe interface then he could help me with this too. Thanks.
 

I'm not familiar with PCIe but it seems to me that what you ask could be solved by dropping the USB to 3,3V, USB_D- and USB_D+ would need 3,3V zener diodes to GND and the supply voltage from the USB could be droped with a linear regulator or Zener.

Micro-controller USB programers use the same technic.
 

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