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H330S Hardware User Manual
Page 32 of 44
5.4 USB Interface
5.4.1 USB Interface Definition
Pin#
Pin Name
I/O
Description
31
USB_DP
I/O
USB
32
USB_DM
I/O
USB signal-
33
USB_ID
—
USB ID signal (NC is recommended)
34
VUSB
I
USB power input
92
USB_TEST
—
USB TEST signal(NC is recommended)
H330S wireless modules support USB 2.0. Before connecting it to PC, it is necessary to install the related
USB driver.
After inserting the H330S wireless modules to PC, the USB interface will work with the driver and map
seven ports on PC, as follows:
One 3G Modem/AT port for initiating data traffic
Three ports for dispatching AT Command
Two ports for capturing LOG information of the software
One port reserved for future use
5.4.2USB Interface Application
Reference Circuit Design:
Figure 5- 7 USB Interface Reference Circuit Design
T101 and T102 shall be TVS with capacitance lower than 1pF; there is no specific limitation for the
capacitance of T103.
VUSB pin supplies power for USB. The recommended power supply range is 2.5V ~ 5.25V. In designing
