User's Manual

LISA-U1/LISA-H1 series - System Integration Manual
3G.G2-HW-10002-2 Advance Information System description
Page 54 of 116
firmware upgrade over USB and for debug purpose. In both cases, provide as well access to RESET_N
pin, or to the PWR_ON pin, or enable the DC supply connected to the VCC pin to start the module
firmware upgrade (see Firmware Update Application Note [14]).
If the UART interface is not used, all the UART interface pins can be left unconnected, but it is highly
recommended to provide direct access to the RxD, TxD, CTS and RTS lines for execution of firmware
upgrade and for debug purpose.
1.9.3 USB interface
LISA-U1/LISA-H1 series modules provide a high-speed USB interface at 480 Mb/s compliant with the Universal
Serial Bus Revision 2.0 specification [7]. It acts as a USB device and can be connected to any USB host such as a
PC or other Application Processor.
The USB-device shall look for all upper-SW-layers like any other serial device. This means that LISA-U1/LISA-H1
series modules emulate all serial control logical lines.
If the logical DTR line isn't enabled by the USB host, the module doesn’t answer to AT commands by the
USB interface.
Name
Description
Remarks
VUSB_DET
USB detect input
Apply 5 V typical to enable USB
USB_D+
USB Data Line D+
90 Ω nominal differential impedance.
Pull-up or pull-down resistors and external series resistors as
required by the USB 2.0 high-speed specification [7] are part
of the USB pad driver and need not be provided externally.
USB_D-
USB Data Line D-
90 Ω nominal differential impedance.
Pull-up or pull-down resistors and external series resistors as
required by the USB 2.0 high-speed specification [7] are part
of the USB pad driver and need not be provided externally.
Table 20: USB pins
The USB interface pins ESD rating is 1 kV (contact discharge). A higher protection level could be required
if the lines are externally accessible on the application board. A higher protection level can be achieved
mounting a very low capacitance ESD protection (e.g. Tyco Electronics PESD0402-140 ESD protection
device) on the lines connected to these pins.
1.9.3.1 USB features
LISA-U1/LISA-H1 series modules simultaneously support 6 USB CDC (Communications Device Class) that assure
multiple functionalities to the USB physical interface. The 6 available CDCs are configured as described in the
following list:
 USB1: AT commands / data connection
 USB2: AT commands / data connection
 USB3: AT commands / data connection
 USB4: GPS tunneling dedicated port
 USB5: 2G trace dedicated port
 USB6: 3G trace dedicated port
LISA-U1/LISA-H1 series module identifies itself by its VID (Vendor ID) and PID (Product ID) combination, included
in the USB device descriptor. VID and PID of LISA-U1/LISA-H1 series modules are the following:
 VID = 0x1546
 PID = 0x1101