LTE Standard Module Series
EC21 Mini PCIe Hardware Design
EC21_Mini_PCIe_Hardware_Design 19 / 67
3.2. Pin Description
The following tables show the pin definition and description of the 52 pins on EC21 Mini PCIe.
Table 3: I/O Parameters Definition
Table 4: Pin Description
Type
Description
DI
Digital Input
DO
Digital Output
IO
Bidirectional
OC
Open Collector
PI
Power Input
PO
Power Output
Pin No.
Mini PCI Express
Standard Name
EC21 Mini PCIe
Pin Name
I/O
Description
Comment
1
WAKE#
WAKE#
OC
Output signal used to wake
up the host
2
3.3Vaux
VCC_3V3
PI
3.0V~3.6V, typically 3.3V
DC supply
3
COEX1
RESERVED
Reserved
It is
prohibited to
be pulled up
to high level
before
startup.
4
GND
GND
3.0V~3.6V, typically 3.3V
DC supply
5
COEX2
RESERVED
Reserved
It is
prohibited to
be pulled up
to high level
before
startup.
