Installation Instructions

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LISA-U2 series - System Integration Manual 
UBX-13001118 - R19  Early Production Information  System description 
    Page 52 of 175 
1.9  Serial communication 
LISA-U2  modules  provide  the  following  serial  communication  interfaces  where  AT  command  interface  and 
Packet-Switched / Circuit-Switched Data communication are concurrently available: 
  One  asynchronous  serial  interface  (UART)  that  provides  complete  RS-232  functionality  conforming  to 
ITU-T V.24 Recommendation [3], with limited data rate 
  One  Inter  Processor  Communication  (IPC)  interface  that  includes  a  synchronous  SPI-compatible  interface, 
with maximum data rate of 26 Mb/s 
  One high-speed USB 2.0 compliant interface, with maximum data rate of 480 Mb/s.  
 
The  LISA-U2  modules are  designed to  operate  as  an  HSPA  cellular modem,  which represents  the  data circuit-
terminating  equipment  (DCE)  as  described  by  the  ITU-T  V.24  Recommendation  [3].  A  customer  application 
processor connected to the module through one of the interfaces represents the data terminal equipment (DTE). 
 
All the interfaces listed above are controlled and operated with: 
  AT commands according to 3GPP TS 27.007 [4] 
  AT commands according to 3GPP TS 27.005 [5] 
  AT commands according to 3GPP TS 27.010 [6] 
  u-blox AT commands 
 
  For the complete list of supported AT commands and their syntax see u-blox AT Commands Manual [2]. 
 
The module firmware can be upgraded over all the serial interfaces listed above by means of AT command (for 
more details see section 3.1 as well as the u-blox AT Commands Manual [2], +UFWUPD command). 
The module firmware can be upgraded over the following serial interfaces using the u-blox EasyFlash tool: 
  The UART interface (only the RxD and TxD lines are needed) 
  The USB interface (all the provided lines VUSB_DET, USB_D+ and USB_D- are needed) 
 
  To  directly  enable  PC  (or  similar)  connection  to  the  module  for  firmware  upgrade  using  the  u-blox 
EasyFlash tool, provide direct access  on the  application  board to  the  VUSB_DET, USB_D+ and USB_D- 
lines of the module (or to the RxD and TxD lines). Also provide access to the PWR_ON or the RESET_N 
pins,  or  enable  the  DC  supply  connected  to  the  VCC  pin  to  start  the  module  firmware  upgrade  (see 
Firmware Update Application Note [17]). 
 
The following sub-sections describe the serial interfaces configuration and provide a detailed description of each 
interface for the application circuits. 
 