User guide

WA_DEV_FEX20_UGD_002 Rev 004 March 08, 2011 47
Fastrack Xtend User Guide
Interfaces
 Download feature is not supported by USB
 CDC 1.1 – ACM compliant
Table 23. USB Electrical Characteristics
Parameter
I/O
Min
Typ
Max
Unit
VBUS
I
4.75
5
V
D-, D+
I/O
3
3.3
3.6
V
VBUS Input current consumption*
100
mA
* Fastrack Xtend without battery accessory
The USB feature can be activated by using the AT+WMFM=0,1,3 AT command. Refer to document
[7] Firmware 7.4a AT Commands Manual (Sierra Wireless Software Suite 2.31)/Firmware 7.4 AT
Commands Manual (Sierra Wireless Software Suite 2.30) for more information regarding this AT
command.
5.2. Back Interface
Figure 22. Fastrack Xtend Back Interface
Note: * The secondary RF interface is only available for FXT003 and FXT004.
** The SIM interface is not available in FXT004.
5.2.1. SIM Interface
A SIM card can be directly connected to the Fastrack Xtend through the embedded SIM socket. This
interface controls 3V / 1V8 SIM cards and it is fully compliant with GSM 11.11 recommendations
concerning SIM functions.
The SIM interface of the Fastrack Xtend is ESD protected. Transient overvoltage protections in ESD
are internally added on the signals connected to the SIM interface in order to prevent any damage
from electrostatic discharge.
SIM Interface**
Main RF Interface
Secondary RF Interface*
LED Status Indicator
Expansion Card Compartment