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H350 LGA Serials Module Hardware User Manual Page 26 of 37
5.4
USB Interface
5.4.1
USB Interface Description
Pin#
Pin Name
I/O
Description
31
USB_DP
I/O
USB
32
USB_DM
I/O
USB signal-
30
USB_ID
—
USB ID signal (NC is recommended)
33
VUSB
I
USB power input
29
USB_TEST
—
USB TEST signal (NC is recommended)
H350 wireless communication module supports USB 2.0. Install the corresponding USB driver before use on PC.
After H350 wireless communication module plugged into the PC, the USB can map seven ports:
One 3G Modem/AT port for data operation
Three ports for sending AT Command
One port for trace
Two ports are reserved
5.4.2
USB Interface Application
Reference Design:
Figure 5-7 USB Interface Reference Design
T101 and T102 should be low capacitor TVS, it is below 1 pF. No special requirement for T103.
VUSB is USB power supply, Recommend power supply range is 2.5V ~ 5.25V.
VUSB should be connect to a level (2.5V ~ 5.25V) or USB cannot be recognized.