PCI Express Mini Card (Mini PCIe) pinout

PCI Express Mini Card (also known as Mini PCI Express, Mini PCIe,
 and Mini PCI-E) is a replacement for the Mini PCI form factor based on
 PCI Express. It is developed by the PCI-SIG. The host device supports both
PCI Express and USB 2.0 connectivity, and each card uses whichever the
designer feels most appropriate to the task. Most laptop computers
 built after 2005 are based on PCI Express and can have several Mini Card slots.

Top side		Bottom side
1		2	3.3V
3	Reserved****	4	GND
5	Reserved****	6	1.5V
7	CLKREQ#	8	VCC**
9	GND	10	I/O**
11	REFCLK-	12	CLK**
13	REFCLK+	14	RST**
15	N/C or GND	16	VPP**
Mechanical key
17	Reserved	18	GND
19	Reserved	20	Reserved***
21	GND	22	PERST#
23	PERn0	24	+3.3Vaux
25	PERp0	26	GND
27	GND	28	+1.5V
29	GND	30	SMB_CLK
31	PETn0	32	SMB_DATA
33	PETp0	34	GND
35	GND	36	USB_D-
37	Reserved*	38	USB_D+
39	Reserved*	40	GND
41	Reserved*	42	LED_WWAN#
43	Reserved*	44	LED_WLAN#
45	Reserved*	46	LED_WPAN#
47	Reserved*	48	+1.5V
49	Reserved*	50	GND
51	Reserved*	52	+3.3V

*Reserved for future second PCI Express Lane (if needed).
Pin 51 has changed to be W_DISABLE2#
**Reserved for future Subscriber Identity Module (SIM) interface (if needed)
***Reserved for future wireless disable signal (if needed)
****Reserved for future wireless coexistence control interface (if needed)