CEM600 EVDO Mini PCIE Module Hardware User Guide
Shang Hai YUGE Information Technology co., LTD
Page 13 of 25
Figure 5-2 Serial connection reference design
5.2 USB interface
Table 5-2 USB Interface Definition
Pin
Signal name I/O properties
High value
Description
36
USB_D-
Two way
3.3V
USB data cable -
38
USB_D+
Two way
3.3V
USB data cable +
GND
Ground
The USB interface supports USB 2.0 Fullspeed and Lowspeed. Note that CEM600 can only
be a slave device.
The USB interface supports the following features:
Software download upgrade
Data communication
AT Command
VBUS
DP
DN
59
12
10
Module
USB
DEVICE
VBUS
D+
D-
USB
HOST
Figure 5-3 USB interface signal
The USB interface reference design is shown below. Note that the ESD protection device
should be added to the data line.
