Quectel EC25

LTE Module Series
EC25 Mini PCIe Hardware Design
EC25_Mini_PCIe_Hardware_Design Confidential / Released 17 / 42
1. Keep all NC, reserved and unused pins unconnected.
2. “*” means the digital audio (PCM) function is only supported on Telematics version.
3.2.2. Pin Assignment
The following figure shows the pin assignment of EC25 Mini PCIe module. The top side contains EC25
module and antenna connectors.
PIN2
PIN52
BOT
PIN1
PIN51
TOP
Figure 2: Pin Assignment
48
1.5V
NC
49
RESERVED
PCM_DIN*
DI
PCM data input
50
GND
GND
Mini card ground
51
RESERVED
PCM_SYNC*
IO
PCM frame synchronization
52
3.3Vaux
VCC_3V3
PI
3.3V DC supply
NOTES
Quectel
Confidential