Usb Pin Descriptions; Electrical Characteristics; Application Notes; Host-Developed Usb Drivers - Sierra Wireless AirPrime SL808 Series Product Technical Specification & Customer Design Manuallines

Table 4-13: USB interface pins
Pin Signal
50 USB_D+
51 USB_D-
a. See Table 4-4
Rev 1 Dec.10 Proprietary and Confidential - Specifications subject to change

4.7.1 USB pin descriptions

Table 4-13 describes the UART1 interface pins.
See Digital I/O electrical information
and reset state definitions.
I/O Reset Description
type a
state
HS-USB data +
HS-USB data -
on page 40 for state definitions.

4.7.2 Electrical characteristics

Table 4-14 describes the USB interface's electrical characteristics.
Table 4-14: USB interface electrical characteristics
Parameter
USB_D+
USB_D-

4.7.3 Application notes

See Reference schematic

4.7.4 Host-developed USB drivers

Note: If you are using Sierra Wireless drivers, you can skip this section—it is intended for
developers who are creating their own USB drivers.
Detailed USB driver specifications for Sierra Wireless AirPrime modules are
included in the AirCard/AirPrime USB Driver Developer's Guide, available from
your Sierra Wireless account representative.
on page 39 for 1V8 voltage characteristics
Notes
Protected against ±500V Human Body Model
•
ESD.
ESD suppressor with shunt capacitance <1 pF
•
is recommended.
Host must ensure D+ and D- traces are well
•
matched and of differential impedance of 90 Ω.
All high-speed differential routing techniques
should be applied.
Allocate room to accommodate a common-
•
mode choke filter (90  impedance) between
the module and destination
Minimum Typical
3 3.3
on page 40 for an implementation of the USB interface.
Maximum Unit
3.6 V
45