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3.12. USB
Interface*
BG952A-GL QuecOpen provides one integrated Universal Serial Bus (USB) interface which complies
with the USB 2.0 specification and supports full speed mode only.
The following table shows the pin definition of USB interface.
Table 14: Pin Definition of USB Interface
Pin Name
Pin No.
USB_VBUS
8
USB_DP
9
USB_DM
10
For more details about USB 2.0 specification, visit http://www.usb.org/home.
It is recommended to reserve test points for debugging and firmware
To ensure USB data signal integrity, if possible, reserve a 0 Ω resistor on USB_DP and USB_DM traces,
respectively. Resistors R1 and R2 should be placed close to the module and to each other. The extra
trace stubs must be as short as possible.
To meet USB 2.0 specification, comply with the following principles while designing the USB interface.
It is important to route the USB signal traces as differential pairs with ground surrounded. The
impedance of USB differential trace is 90 Ω.
BG952A-GL_QuecOpen_Hardware_Design
I/O
Description
AI
USB connection detect
AIO
USB differential data (+)
AIO
USB differential data (-)
Figure 16: Reference Design of USB Interface
LPWA Module Series
Comment
Typical 5.0 V
Require differential impedance of 90 Ω
upgrading*
in your designs.
38 / 72
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